Ariens

LM21SCH - Lawn mower Ariens - Free user manual and instructions

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Product Type Walk-behind lawn mower (self-propelled)
Brand Ariens
Model LM21SCH
Cutting Width 21 inches (53 cm)
Engine Type Gasoline, 4-stroke (typically Briggs & Stratton or similar)
Engine Displacement Approximately 150-190 cc
Fuel Type Unleaded gasoline (regular octane)
Oil Capacity Approximately 20 fl oz (0.6 L) SAE 30 or 10W-30
Cutting Height Adjustment Single-lever, 6-position, 1-4 inches (25-102 mm)
Deck Material Steel stamped deck
Grass Collection Rear bag, capacity approximately 2.5 bushels (60 L)
Mulching Capability Yes, with included mulching plug
Drive Type Self-propelled, rear-wheel drive with variable speed
Weight Approximately 85 lbs (38.5 kg)
Dimensions (L x W x H) Approximately 67 x 42 x 42 inches (170 x 107 x 107 cm)
Wheel Size Front: 8 inches, Rear: 10 inches
Maintenance Regular oil changes, air filter cleaning, blade sharpening
Safety Features Blade brake control, operator presence control, safety shield
Warranty Limited 3-year consumer warranty

Frequently Asked Questions - LM21SCH Ariens

How do I start the Ariens LM21SCH lawn mower?
Ensure the fuel tank is filled with fresh gasoline and the oil level is correct. Press the primer bulb 3 times, set the throttle to the "choke" position, and pull the starter rope firmly. Once the engine starts, gradually move the throttle to the "run" position.
What type of oil should I use?
Use SAE 30 or 10W-30 engine oil, specifically designed for small engines. Check the oil level before each use and change it every 25 hours of operation or annually.
How do I adjust the cutting height?
Locate the single-lever height adjustment on the deck. Move the lever to one of the 6 positions to raise or lower the cutting height between 1 and 4 inches. Ensure the mower is on a flat surface.
How do I replace the blade?
Disconnect the spark plug wire for safety. Tip the mower on its side (air filter up). Use a wrench to remove the blade bolt. Replace with a genuine Ariens blade (part number 07204000) and tighten the bolt to 35-40 ft-lbs.
Why does my mower vibrate excessively?
Excessive vibration often indicates a bent or unbalanced blade. Check the blade for damage and replace it if necessary. Also ensure the blade bolt is tight and the deck is clean.
How do I clean the mower deck?
Use a garden hose with a nozzle to spray the underside of the deck after each use. Avoid using a pressure washer. Tilt the mower (air filter up) and scrape off any grass buildup with a plastic scraper.
Is the self-propelled drive adjustable?
Yes, the variable speed control allows you to adjust the ground speed from 0 to approximately 4 mph. Turn the dial or lever to your desired pace. The drive engages when you push the handle lever.
What should I do if the engine won't start?
Check fuel level and quality. Ensure the spark plug wire is connected. Verify the oil level is correct. If it still won't start, clean or replace the air filter and spark plug. Refer to the manual for further troubleshooting.
How often should I sharpen the blade?
Sharpen the blade every 10-15 hours of use or when you notice a ragged cut. Remove the blade and sharpen with a file or grinder, keeping the original angle. Balance the blade before reinstalling.
What is the warranty period?
Ariens offers a limited 3-year consumer warranty on the LM21SCH. The warranty covers defects in materials and workmanship. Commercial use may have a shorter warranty. Register your product at Ariens.com.

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USER MANUAL LM21SCH Ariens

Walk Behind Lawn Mower

Owner/Operator Manual

Models

911099 - LM21SH

911101 - LM21SWH

911102 - LM21SCH

911330 - LM21SW

911331 - LM21SE

911514 - LM21S

911515 - LM21SE

911525 - LM21SW

911526 - LM21SC

911531 - LM21S

Ariens LM21SCH - Models - 1

natural_image Black-and-white photo of a lawn mower with visible blades and wheels (no text or symbols)

Ariens LM21SCH - Models - 2

Ariens LM21SCH - Models - 3

Ariens LM21SCH - Models - 4

ENGLISH

Ariens LM21SCH - Models - 5

FRANÇAIS

Ariens LM21SCH - Models - 6

ESPAGNOL

Transfer model & serial number label from product registration here.

Safety5
Assembly9
Controls and Features10
Operation1
Maintenance16
Service and Adjustments18
Storage.22
Troubleshooting22
Service Parts24
Accessories24
Specifications25
Warranty27

INTRODUCTION

THE MANUAL

Before using the unit, carefully and completely read your manuals. The contents will give you an understanding of safety instructions and controls during normal operation and maintenance.

All reference to left, right, front, or rear are given from the operator's position, facing the direction of forward travel.

SERVICE AND REPLACEMENT PARTS

When ordering replacement parts or making service inquiries, know the Model and Serial numbers of your unit and engine.

Numbers are located on the product registration form in the unit literature package. They are also printed on a serial number label, located on the frame of your unit (Figure 1 and Figure 2).

Serial Number Label Figure 1 OM1600

Ariens LM21SCH - SERVICE AND REPLACEMENT PARTS - 2

natural_image Close-up of a mechanical assembly with visible components and a label (no readable text or symbols)

Engine Serial Number Label
Unit Serial Number Label
Figure 2

- Record Unit Model and Serial numbers here:

- Record Engine Model & Serial numbers here:

PRODUCT REGISTRATION

The Ariens dealer must register the product at the time of purchase. Registering the product will help the company process warranty claims or contact you with the latest service information. All claims meeting requirements during the limited warranty period will be honored, whether or not the product registration card is returned. Keep a proof of purchase if you do not register your unit.

Customer Note: If the Dealer does not register your product, please fill out, sign and return the product registration card to Ariens or go to www.ariens.com on the internet.

UNAUTHORIZED REPLACEMENT PARTS

Use only Ariens replacement parts. Replacing any part on this vehicle with anything other than an Ariens authorized replacement part may adversely affect the performance, durability, or safety of this unit and may void the warranty. Ariens disclaims liability for any claims or damages, whether warranty, property damage, personal injury or death arising out of the use of unauthorized replacement parts. To locate your nearest Ariens Dealer, call 1-800-678-5443 or go to www.ariens.com on the internet.

DEALER DELIVERY

Dealer should:

  1. Check that all assembly and adjustments have been properly completed.
  2. Fill out Original Purchaser Registration Card and return the card to Ariens.

  3. Explain Ariens Limited Warranty Policy.

  4. Explain recommended lubrication and maintenance. Advise customer on adjustments. Remind customer to change oil in 4 cycle engine crankcase after first five (5) hours of operation.
  5. Instruct customer on controls and operation of unit. Discuss and emphasize the Safety Rules. Give customer Owner/Operator, Parts, and Engine manuals. Advise customer to thoroughly read and understand them.

DISCLAIMER

Ariens reserves the right to discontinue, make changes to, and add improvements upon its products at any time without public notice or obligation. The descriptions and specifications contained in this manual were in effect at printing. Equipment described within this manual may be optional. Some illustrations may not apply to your unit.

SAFETY

Ariens LM21SCH - SAFETY - 1

WARNING: This cutting machine is capable of amputating hands and feet and throwing objects. Failure to observe the safety instructions in the manuals and on decals could result in serious injury or death.

Slopes are a major factor related to slip and fall accidents.

Operation on all slopes requires extra caution.

Tragic accidents can occur if the operator is not alert to the presence of children. Never assume that children will remain where you last saw them.

Gasoline is extremely flammable and the vapors are explosive, handle with care.

Stop unit and engine, remove key (if equipped) and allow moving parts to stop before leaving operator's position.

SAFETY ALERTS

Ariens LM21SCH - SAFETY ALERTS - 1

Look for these symbols to point out important safety precautions. They mean:

Ariens LM21SCH - SAFETY ALERTS - 2

Attention!

Personal Safety Is Involved! Become Alert!

Obey The Message!

The safety alert symbols above and signal words below are used on decals and in this manual.

Read and understand all safety messages.

Ariens LM21SCH - SAFETY ALERTS - 3

DANGER: IMMINENTLY HAZARDOUS SITUATION! If not avoided, WILL RESULT in death or serious injury.

Ariens LM21SCH - SAFETY ALERTS - 4

WARNING: POTENTIALLY HAZARDOUS SITUATION! If not avoided, COULD RESULT in death or serious injury.

Ariens LM21SCH - SAFETY ALERTS - 5

CAUTION: POTENTIALLY HAZARDOUS SITUATION! If not avoided, MAY RESULT in minor or moderate injury. It may also be used to alert against unsafe practices.

NOTATIONS

NOTE: General reference information for proper operation and maintenance practices.

IMPORTANT: Specific procedures or information required to prevent damage to unit or attachment.

PRACTICES AND LAWS

Practice usual and customary safe working precautions, for the benefit of yourself and others. Understand and follow all safety messages. Be alert to unsafe conditions and the possibility of minor, moderate, or serious injury or death. Learn applicable rules and laws in your area.

Original purchaser of this unit was instructed by the seller on safe and proper operation. If anyone other than the original purchaser will use the unit, ALWAYS provide this manual and any needed safety training before operation.

SAFETY DECALS AND LOCATIONS

ALWAYS replace missing or damaged safety decals. Refer to Figure 3 for safety decal locations.

CAUTION * BAG IS SUBJECT TO WEAR AND GO TRIEMINATION, * CHECK BAD FREQUENTLY, REPLACE WHEN NECESSARY, * USE ORIGINAL RAG TO COMPLY WITH SAFETY SPECIFICATIONS. PRECAUCION * LA BAG SA FESTA SUJETA A GEGASTE Y DETERIOR, * REVEBAR LA BOLLA FREQUENTAMENTI, Y WEER LAZARLA IM ES NECESSARIO, * USAN HOLLSAS ONIONAL PARA CUMPLIN CON LAS ESPECIFICACIONES DE SEGURIDAD. ATTENTION * LE SAC EST SOLUMB À INSURE ET LA DETERIORATION, * VERIFET EN LE SAC FRÉQUERIMENT LE REEMPLACER AU DESIGN, * UTER BER UN SAC D'ONGÈME CONFIRME AUX NORAME DE SECURATE. MEETS C.P.S.C. BLADE SAFETY REQUIREMENTS TO AVOID SENSUS BLADE ON DIALET - Need the safety's hazard - Keep children and others under 100% with carrying - Never draw discharge board from people. There will be one case of them. - Keep safety device guards at least, inside, etc. in plastic handling, or active devices, etc. and down. - Let screen and panel buttons and white moving buttons. - Do not park on a blade unless covered or blocked. - De and allow operation of touch by activated personnel. POUR ENTER LES BLESSURES GRAVES OU LA MERT - Use a motor to do it. But, - "Have you want to handle the power to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried-out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carried out to be carriedout PARA EXTERIANDS SENSUS O LA MUNTE? - Use an external del capender, - Maintain a bus wheel or a le cution with passenger vehicles on the unitled car seat or a motorcycle. - Use the bus car seat with a car seat or a motorcycle, or a bus car the passenger vehicle is part of the passenger. - Maintain the bus car seat or a car seat or a car seat or a car seat. - Use the bus car seat or a car seat or a car seat or a car seat. - Use the bus car seat or a car seat or a car seat or a car seat. - Use the bus car seat or a car seat or a car seat or a car seat. - Use the bus car seat or a car seat or a car seat or a car seat. - Use the bus car seat or a car seat or a car seat or a car seat. - Use the bus car seat or a car state or a car state or a car state or a car state. - Use the bus car seat or a car state or a car state or a car state or a car state. - Use the bus car seat or a car state or a car state or a car state or a car state. - Use the bus car seat or a car state or a car state or a car state or a car state. - Use the bus car seat or a car state or a car state or a car state or a car state. - Use the bus car seat OR CALENTS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS OF THE PEACEUTICALS Figure 3 OM0811

1. DANGER!

TO AVOID SERIOUS INJURY OR DEATH

Ariens LM21SCH - TO AVOID SERIOUS INJURY OR DEATH - 1
OL1801

Read the operator's manual.

Ariens LM21SCH - TO AVOID SERIOUS INJURY OR DEATH - 2
OL4370

Keep children and others away from unit while operating.

Ariens LM21SCH - TO AVOID SERIOUS INJURY OR DEATH - 3
OL0910

Never direct discharge toward other people. Thrown objects can cause injury.

Ariens LM21SCH - TO AVOID SERIOUS INJURY OR DEATH - 4
OL4540

Do not operate mower unless guards are in operating position or entire bagger is attached.

Ariens LM21SCH - TO AVOID SERIOUS INJURY OR DEATH - 5
OL3030

Keep safety devices (guards, shields, switches, etc.) in place and working.

  • Go across slopes, not up and down.
  • Look down and behind before and while moving backward.
  • Do not park on a slope unless chocked or blocked.
  • Do not allow operation of machine by untrained personnel.

2. DANGER!

KEEP HANDS AND FEET AWAY

Do not operate mower unless guards are in operating position or bagger is attached.

3. CAUTION!

  • Bag is subject to wear and deterioration.
  • Check bag frequently, replace when necessary.
  • Use original bag to comply with safety specifications.

SAFETY RULES

If unit is to be used by someone other than original purchaser; loaned, rented or sold, ALWAYS provide this manual and any needed safety training before operation.

Read, understand and follow all safety practices in Owner/Operator Manual before beginning assembly. Failure to follow instructions could result in personal injury and/or damage to unit.

ALWAYS remove key (if equipped) and disconnect wire from spark plug before assembly. Unintentional engine start up can cause death or serious injury.

Complete a walk around inspection of unit and work area to understand:

  • work area
  • your unit
  • all safety decals.

Clear work area of stones, sticks, wire and foreign objects which might be picked up and thrown. Tall grass can hide obstacles.

Know the work area. Stay alert for holes, rocks, rough terrain and hidden hazards.

Keep away from drop-offs, ditches, or embankments that could cause operator to lose footing or control of unit.

ALWAYS be aware of traffic when operating along streets or curbs.

Keep work area clear of all persons, children and pets.

Keep children out of the work area and under the watchful care of a responsible adult.

ALWAYS operate unit when there is good visibility and light.

DO NOT mow wet grass.

ALWAYS be sure of your footing. Keep a firm hold on handlebar. Walk, NEVER run.

Engine/blade control feature on mower stops engine and blade within 3 seconds whenever operator releases handlebar. Check this feature frequently. If feature fails to operate, disconnect spark plug wire and adjust or have it repaired before using unit.

Only trained adults may operate unit. Training includes actual operation.

NEVER operate after or during the use of medication, drugs or alcohol. Unit requires complete and unimpaired attention.

NEVER allow children to use mower.

ALWAYS keep hands and feet away from rotating parts. Rotating parts can cut off body parts.

ALWAYS keep hands away from pinch points.

Fumes from engine exhaust can cause death or serious injury. DO NOT run engine in an enclosed area.

ALWAYS protect eyes, face, and body with adequate safety gear and protective clothes. Wear sturdy footwear, gloves and safety goggles or safety glasses with side shields while operating mower.

NEVER operate mower barefoot or when wearing open sandals or canvas shoes.

NEVER wear loose clothes, long hair or jewelry that may get caught in rotating parts.

ALWAYS stand clear of discharge when operating unit.

NEVER direct discharge toward bystanders.

Operator is responsible for bystander safety.

DO NOT touch hot parts. Allow parts to cool.

Keep safety devices or guards in place and functioning properly. NEVER modify or remove safety devices.

Read, understand, and follow all instructions in the manual and on the machine before starting. Understand:

• How to operate all controls
• The functions of all controls
• How to STOP in an emergency.

DO NOT attempt to start your engine until you know what the controls do and how they work.

DO NOT tilt mower when starting it.

Keep feet away when starting engine.

DO NOT start the engine or operate mower without side discharge cover or side discharge deflector installed.

Take all possible precautions when leaving unit unattended.

ALWAYS shut off engine, remove key (electric start models) and disconnect spark plug wire to prevent accidental starting or unauthorized use.

Stop engine if anyone enters the work area.

NEVER attempt to make any adjustments to unit while engine is running (except where specifically recommended). Stop engine, remove key (electric start models) and wait for all moving parts to stop before servicing.

DO NOT make cutting height wheel adjustments while the engine is running.

If you strike an object, or if equipment vibrates abnormally, stop engine at once, wait for moving parts to stop and disconnect wire from spark plug. Repair any damage before restarting unit.

Keep rear door closed when engine is running unless the grass bag is in place.

Stop engine before removing and emptying grass bag.

When mulching or bagging, ALWAYS install discharge cover.

When side discharging, ALWAYS install side discharge deflector.

ALWAYS shut off engine, allow blade to stop and disconnect spark plug wire before clearing clogs or cleaning unit.

Check grass bag for wear, damage, and/or deterioration. Replace only with Ariens original equipment replacement parts for safety.

To reduce fire hazard and overheating, keep equipment free of grass, leaves, debris or excessive lubricants.

Use extra care when approaching blind corners, shrubs, trees, or other objects which may obscure vision.

DO NOT mow at too fast a rate. DO NOT change engine governor setting or over-speed the engine.

Do not operate mower on gravel or loose material such as sand. Stop mower when crossing drives, walks, or roads to prevent damage or injury from thrown objects.

DO NOT pull mower backwards unless absolutely necessary. Look down and back, especially for small children, before and while moving backwards.

Releasing wheel drive control must stop mower's forward movement. If this feature fails to operate, disconnect spark plug wire and repair before using unit.

On self-propelled models, wheel drive must be disengaged when starting engine.

DO NOT operate on steep slopes.

NEVER leave unit unattended on a slope. Chock wheels if parking on a slope.

Mow across the face of slopes, never up and down. Be especially cautious when changing direction on slopes.

This product is equipped with an internal combustion engine. DO NOT use on or near any unimproved, forest or brush covered land unless the exhaust system is equipped with a spark arrestor meeting applicable local, state or federal laws. A spark arrestor, if used, must be maintained in effective working order by the operator. See your Ariens Dealer or engine manufacturer's service center.

Fuel is highly flammable and its vapors can explode. ONLY use approved fuel containers.

  • NO Smoking!
  • NO Sparks!
  • NO Flames!
  • Allow engine to cool before filling fuel tank.

Never fill containers inside a vehicle or on a truck or trailer bed with a plastic liner. Always place containers on the ground away from your vehicle before filling.

When practical, remove gas-powered equipment from the truck or trailer and refuel it on the ground. If this is not possible, then refuel such equipment on a trailer with a portable container, rather than from a gasoline dispenser nozzle.

Keep the nozzle in contact with the rim of the fuel tank or container opening at all times until fueling is complete. Do not use a nozzle lock-open device.

Check fuel supply before starting engine.

DO NOT fill gasoline tank indoors, when engine is running, or while engine is hot.

Allow engine to cool several minutes before removing fuel cap.

DO NOT overfill. Allow about 1/4" (6 mm) of tank space for fuel expansion.

Replace gasoline tank cap securely and clean any spilled fuel before starting engine. If fuel is spilled on clothing, change clothing immediately.

NEVER store fuel inside where there is an open flame, such as a water heater.

ALWAYS drain fuel outdoors away from ignition sources.

ALWAYS shut off engine, and remove key, and close fuel shutoff valve when transporting unit on a truck or trailer.

Avoid Electric Shock. DO NOT disconnect wire from spark plug while engine is running. Do NOT put battery in fire or mutilate.

Explosive Gases!

NO flames, NO sparks, NO smoking, near battery.

Poisonous battery fluid contains sulfuric acid. Contact with skin, eyes or clothing can cause severe chemical burns.

ALWAYS wear safety glasses and protective gear near battery.

ALWAYS keep batteries out of reach of children.

Battery posts, terminals and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harm. Wash hands after handling.

Accidental engine start up can cause death or serious injury. Except where specifically recommended, ALWAYS stop engine, remove key (electric start models), wait for moving parts to stop, allow parts to cool and disconnect spark plug wire before inspecting, servicing, adjusting or repairing unit.

Keep mower free of grass, leaves, or other debris build-up.

Keep equipment in good condition.

Maintain or replace safety and instruction labels, as necessary.

Follow engine manufacturer's safety instruction when servicing engine.

Check all hardware at regular intervals, especially blade attachment bolts. Keep all hardware properly tightened.

Before tipping unit, remove fuel and battery (if equipped).

Ensure all wheel blocks, jack stands and tie downs will support unit during maintenance. Replace worn-out mufflers immediately. Continued use could result in fire or explosion.

Sharp edges can cut or amputate fingers or a hand. Wrap blade or wear sturdy gloves to service.

Use only replacement parts designed for your unit. See your Ariens Dealer.

Allow engine to cool before storing in any enclosure.

ALWAYS clean unit before extended storage. See engine manual for proper storage.

DO NOT store unit inside a building with fuel in the fuel tank where any ignition sources are present.

Use only accessories which have been approved by Ariens and are properly installed.

Check attachments frequently and replace worn or damaged components with manufacturer's recommended parts.

ASSEMBLY

Ariens LM21SCH - ASSEMBLY - 1

CAUTION: AVOID INJURY. Read and understand the entire Safety section before proceeding.

CARTON CONTENTS
1 2 3 4 5 6 7 8 OM1706

  1. Mower Unit
  2. Side Discharge Cover
  3. Battery Charger (911331, 515)
  4. Side Discharge Deflector
  5. Grass Bag Frame
  6. Literature Pack
  7. Mulch Plug
  8. Grass Bag

Figure 4

ASSEMBLY

  1. Unfold and adjust handlebar. See Handlebar Height on page 19.

NOTE: DO NOT bend the speed control rod (if equipped) when unfolding the handlebars.

  1. Fill engine crankcase with oil. See engine manual.
  2. Set-up mower for bagging, side discharge or mulching. See Mower Set-Up on page 14.
  3. Fully charge battery (electric start models). See To Charge Battery on page 19.
  4. Fill fuel tank. See Filling Fuel Tank on page 14.
  5. Connect spark plug wire.

  6. Check the engine/blade control feature. Try starting the engine without the engine/blade control held against the handlebar. Engine must not start. If engine starts, stop engine and adjust or repair engine/blade control. See Engine/Blade Control Adjustment on page 20.

CONTROLS AND FEATURES

Labeled diagram of a lawn mower system with numbered parts for identification and assembly reference.

Figure 5
OM1687

  1. Engine/Blade Control
  2. Wheel Drive Control
  3. Adjustable and Folding Handlebars
  4. Swivel Wheel Lock (911100) (911101, 330, 525)
  5. Grass Bag
  6. Rear Door
  7. Fuel Tank and Cap
  8. Fuel Shutoff Valve (911099, 101, 102)
  9. Choke Lever (911099, 101)
  10. Height Adjustment Pins (911101, 330, 525)
  11. Muffler and Muffler Guard
  12. Ignition Switch (911515)
  13. Oil Fill/Dipstick
  14. Oil Filter (911526)
  15. Cutting Height Levers (2 Rear Wheel Adjusters, 2 Front Wheel Adjusters)
  16. Primer Bulb (911330, 331, 514, 515, 525, 526, 531)
  17. Air Filter
  18. Side Discharge Cover
  19. Side Discharge Deflector
  20. Mulchmaster™ Plug
  21. Handlebar Adjustment Holes
  22. Recoil Starter Handle
  23. Speed Control Rod
  24. Throttle Control (911102, 526)

OPERATION

CONTROLS AND FEATURES

See Figure 5 for locations.

Ariens LM21SCH - CONTROLS AND FEATURES - 1

WARNING: Improper operation can lead to injury. Learn what the controls do and how they work. Thoroughly read and understand entire Operator Manual.

Ariens LM21SCH - CONTROLS AND FEATURES - 2

CAUTION: AVOID INJURY. Read and understand the entire Safety section before proceeding.

Engine/Blade Control

Ariens LM21SCH - Engine/Blade Control - 1

CAUTION: Check function of Engine/Blade Control regularly. Improper function of control could cause injury.

The engine/blade control must be held against the handlebar to start the engine and blade.

Engine/blade control feature on mower stops engine and blade within 3 seconds whenever operator releases handlebar. Check this feature frequently. If feature fails to operate, disconnect spark plug wire and adjust or have it repaired before using unit.

Ariens LM21SCH - Engine/Blade Control - 2

natural_image Two identical line drawings of hands holding a tool, with no text or symbols present.

STOP START and RUN

OM1230

Handlebar

Adjust handlebar to a safe and comfortable height. See Handlebar Height on page 19.

Recoil Starter Handle

When pulled, handle will turn engine over.

CUTTING HEIGHT ADJUSTMENT

Ariens LM21SCH - CUTTING HEIGHT ADJUSTMENT - 1

DANGER: Avoid injury from rotating blade.

ALWAYS shut off engine before adjusting cutting height.

Ariens LM21SCH - CUTTING HEIGHT ADJUSTMENT - 2

CAUTION: On self-propelled models, both rear wheels must be set at same height or traction drive may not work properly.

Cutting Height Settings Chart

Notch Cut grass length
LOW 1" (25 mm)
2 1-3/8" (35 mm)
3 1-3/4" (45 mm)
4 2-1/4" (57 mm)
5 2-3/4" (70 mm)
HIGH 3-1/4" (83 mm)

Standard Models

To change cutting height, move cutting height levers one notch at a time on each wheel to set desired height (Figure 6).

NOTE: Each wheel on mower must be set at the same height for a level cut.

High
High 1 Low

Rear

Low 1 High

  1. Cutting Height Lever
    Front
    OM0165

Figure 6

Swivel Wheel Models (911101, 330, 525)

To change front wheel cutting height, insert height adjuster pin into the holes that match the desired cutting height and fasten with key ring (Figure 7).

To change rear wheel cutting height, move cutting height levers one notch at a time to set the desired cutting height.

High Low 1 Rear Front 1. Cutting Height Lever 2. Height Adjuster Pin 3. Key Ring Figure 7 OM1270

OPTIONAL CONTROLS

Primer Bulb (911330, 331, 514, 515, 525, 526, 531)

Push the primer bulb in to add fuel for easier engine start.

Choke Control (911099, 101)

Ariens LM21SCH - OPTIONAL CONTROLS - 1

natural_image Simple black arrow pointing right and a vertical line with a small circle on the right (no text or symbols)

Move choke lever to the choke position to start a cold engine.

Throttle (911102)

1 2 3 OL2074

The throttle controls the engine speed and chokes engine for starting.

  1. Start - Push lever all the way forward.
    2.Fast.
  2. Slow - Pull lever all the way rearward.

Throttle (911526)

1 2 3 OL2074

The throttle controls the engine speed and chokes engine for starting.

  1. Start - Push lever all the way forward.
    2.Fast.
    3.Slow - Pull lever all the way rearward.

Ignition Switch (911331, 515)

Ariens LM21SCH - Ignition Switch (911331, 515) - 1

A removable key operates the ignition switch. The key will spring back to the "RUN" position.

RUN Position (1): All controls are operable.

START Position (2): Starter turns over the engine.

Speed Control

Speed control rod changes the mower's forward travel speeds.

Ariens LM21SCH - Speed Control - 1

natural_image Abstract black-and-white graphic with a downward arrow, small fish, and a turtle, labeled 'OM0480' at the bottom (no readable text or symbols in the main graphic)

High –Push rod all the way forward.

Low – Pull rod all the way rearward.

Start mowing slowly and use speed control rod to gradually increase speed to a safe, comfortable walking pace.

Speed control rod should hold the desired speed. If not, adjust speed control bell crank. (See Speed Control Bell Crank on page 22.)

Wheel Drive Control

Ariens LM21SCH - Wheel Drive Control - 1

CAUTION: Unit will move forward at engine start if wheel drive control is engaged. ALWAYS release wheel drive control before starting unit.

NOTE: Engine must be running for wheel drive to propel unit.

To drive forward:

Slowly squeeze and hold wheel drive control against handlebar.

To stop:

Release wheel drive control.

STOP GO OM1240

Swivel Wheel Lock (911101, 330, 525)

Ariens LM21SCH - Swivel Wheel Lock (911101, 330, 525) - 1

CAUTION: Avoid loss of control.

Lock swivel wheels when mowing on a slope or hill. Do not mow on steep slopes.

To hold wheel straight:

  1. Push swivel wheel lock forward.
  2. Push unit forward until wheel locks in place.

To allow wheel to swivel:

  1. Pull swivel wheel lock back.

Unlock - Wheel Swivels Lock - Wheel Held Straight OM1700

Fuel Shutoff Valve (911099, 101, 102)

IMPORTANT: The fuel shutoff valve MUST be in the closed position prior to transporting the unit.

Open the fuel shutoff valve to operate the unit. Close the fuel shutoff valve when storing, transporting or servicing the unit.

911102

Ariens LM21SCH - 911102 - 1

natural_image Close-up of mechanical components inside a vehicle (no visible text or symbols)

Fuel shutoff valve open.

Ariens LM21SCH - 911102 - 2

natural_image Close-up of mechanical components inside a vehicle (no visible text or symbols)

Fuel shutoff valve closed.

911099, 101

Ariens LM21SCH - 911099, 101 - 1

natural_image Circular cropped image showing a textured surface with no visible text or symbols

Fuel shutoff valve open.

Ariens LM21SCH - 911099, 101 - 2

natural_image Close-up of a mechanical component with textured surfaces and a pointed tip (no visible text or symbols)

Fuel shutoff valve closed.

FILLING FUEL TANK

To add fuel to fuel tank:

  1. Put unit in open or well-ventilated area.
  2. Stop engine and allow to cool.
  3. Clean fuel cap and surrounding area.
  4. Remove cap.

IMPORTANT: See engine manual for correct type and grade of fuel.

  1. Fill fuel tank. (see Specifications on page 25 for tank capacity.)
  2. Replace fuel cap and tighten.
  3. ALWAYS clean any spilled fuel.

MOWER SET-UP

Ariens LM21SCH - MOWER SET-UP - 1

CAUTION: DO NOT operate mower unless either side discharge cover or side discharge deflector is installed. Thrown objects may cause damage or injury. Never operate unit with rear door open unless grass bag is in place.

Ariens LM21SCH - MOWER SET-UP - 2

CAUTION: If clog or obstruction prevents grass flow, release engine/blade control and disconnect spark plug wire before attempting to clear away any clogs.

To Bag

Ariens LM21SCH - To Bag - 1

CAUTION: Check grass bag frequently for wear or deterioration. Replace worn or damaged bag with Ariens original equipment replacement bag only.

  1. Shut off unit.
  2. Install side discharge cover.
  3. Lift rear door.
  4. Hook grass bag frame on mounting flange.
  5. Lower rear door.

If necessary, lift rear of grass bag frame to lock in position.

There should be no openings between bag and mounting surface after installing bag. If necessary, clear debris from bag mounting surface.

Grass Bag Removal

  1. Shut off unit.
  2. Lift rear door.
  3. Use handle to lift bag off mounting flange.
  4. Close rear door.

NOTE: Empty grass bag and clean mower pan after each use. DO NOT allow grass clumps or a grass coating to collect inside of grass bag or mower pan. Remove grass bag from mower, wash bag with hose and allow to dry.

To Side Discharge

  1. Shut off unit.
  2. Remove grass bag.
  3. Install Mulchmaster plug (see below).
  4. Remove side discharge cover and keep hardware.
  5. Attach side discharge deflector to studs on mower. Make sure deflector covers discharge opening.
  6. Secure with cover hardware from step 4.

To Mulch

  1. Shut off unit.
  2. Remove grass bag and install side discharge cover.
  3. Open rear door and insert Mulchmaster plug with the beveled face to the left.
  4. Close rear door.

NOTE: Rear door must close flush.

NOTE: For maximum mulching performance, install the Mulchmaster Mulching Kit. See Accessories.

EMERGENCY STOPPING

To stop the mower in an emergency:

  1. Release the engine/blade control.
  2. Release the wheel drive control (self-propelled models).
  3. Allow all moving parts to stop before leaving operator's position.

STARTING AND SHUT OFF

Ariens LM21SCH - STARTING AND SHUT OFF - 1

WARNING: Improper operation can lead to injury. Learn what the controls do and how they work. Thoroughly read and understand entire Operator Manual.

See Figure 5 for all Controls and Features.

NOTE: Start engine on a level surface that is free of debris.

Manual Start

Models 911330, 331, 514, 515, 525, 526, 531

  1. Check each item under Before Each Use in the Maintenance Schedule on page 16.
  2. For engines with a primer, push primer bulb 2 or 3 times for a cold engine.

NOTE: It is unnecessary to prime or choke a warm engine.

  1. For engines with a throttle, place throttle control in the choke position. Once the engine has started, place throttle in the high speed detent.
  2. With engine/blade control held against the handlebar, grasp starter handle and pull rope slowly until it pulls harder. This is the compression stroke. Let rope rewind slowly.
  3. Pull rope with rapid continuous full arm stroke to start engine. Allow rope to rewind slowly.

IMPORTANT: DO NOT let starter handle snap against bracket.

  1. Repeat steps 4 and 5 until engine starts. (If engine does not start, see Troubleshooting on page 22.)

Models 911099, 101, 102

  1. Check each item under Before Each Use in the Maintenance Schedule on page 16.
  2. Open the fuel shut-off valve.

NOTE: It is unnecessary to choke a warm engine.

  1. Move the choke lever to the choke position.
    The choke lever automatically returns to the Off position when the engine/blade control is held against the handlebar (911099, 101).
  2. With engine/blade control held against the handlebar, grasp starter handle and pull rope slowly until it pulls harder. This is the compression stroke. Let rope rewind slowly.
  3. Pull rope with rapid continuous full arm stroke to start engine. Allow rope to rewind slowly.

IMPORTANT: DO NOT let starter handle snap against bracket.

  1. Repeat steps 4 and 5 until engine starts. If engine does not start, release the engine/blade control and perform steps 2 through 5. See engine manual for detailed instructions.
  2. After engine starts, put throttle control in the Fast position (911102).

Electric Start (911331, 515)

NOTE: Recoil may also be used to start the engine (see Manual Start on page 15).

  1. Check each item under Before Each Use in the Maintenance Schedule.
  2. Push primer bulb 2 or 3 times for a cold engine.

NOTE: It is unnecessary to prime or choke a warm engine.

  1. With engine/blade control held against the handlebar, turn the key to "Start" position to crank engine and release key when engine starts.

IMPORTANT: Do not run starter continuously for more than fifteen seconds. If the engine does not start after several attempts, refer to Troubleshooting.

Shut Off

  1. Release wheel drive control and allow unit to stop completely.
  2. Release engine/blade control.
  3. Remove key (electric start models).

Mowing Tips

Cut grass when it is dry.

Keep mower blades sharp.

Do not set cutting height too low. For tall grass, mow twice.

Do not mow too fast.

Mow with engine at full throttle. Discharge clippings into areas already cut.

Vary cutting pattern with each mowing.

NOTE: To prevent dirt and grass from collecting on mower pan, avoid operating over bare ground with only patches of grass.

Mulching Tips

For best mulching performance, cut no more than 1 inch (2.54 cm) of grass per cutting.

MAINTENANCE

Ariens LM21SCH - MAINTENANCE - 1

CAUTION: AVOID INJURY. Read and understand the entire Safety section before proceeding.

Ariens Dealers will provide any service, parts or adjustments which may be required to keep your unit operating at peak efficiency. Should engine require service, contact an Ariens Dealer or an authorized engine manufacturer's service center.

MAINTENANCE SCHEDULE

NOTE: Some working conditions (heavy loads, high ambient temperatures, dusty conditions, or airborne debris) may require more frequent service.

See engine manual for further maintenance and troubleshooting information.

MAINTENANCE SCHEDULE

Service PerformedBefore Each Use25 100
Check Engine/Blade Control
Check Wheel Drive Control
Check Grass Bag •
Clean Unit •
Check Engine Oil •
Check Mower Blade •
Check Drive Belt •
Check Fasteners •
Check Air Cleaner •
Change Engine Oil•*
General Lubrication •
Replace Oil Filter •
Check Spark Plug •
Check Engine Cooling
Check Muffler

* After first 5 Hours of operation

CHECK ENGINE/BLADE CONTROL

The engine and blade must stop within 3 seconds after releasing the control. If the engine and blade continue to run, adjust or repair control immediately. See Engine/Blade Control Adjustment on page 20.

CHECK WHEEL DRIVE CONTROL

The unit must stop quickly and completely when the control is released. Adjust or repair if necessary. See Wheel Drive Control Adjustment on page 21.

CHECK GRASS BAG

Check grass bag frequently for wear or deterioration. Replace worn or damaged bag with Ariens original equipment replacement bag only.

CLEAN UNIT

Before each use clean unit, muffler and engine surfaces of debris, oil or fuel spills to ensure proper cooling and prevent fires.

CHECK ENGINE OIL

IMPORTANT: Maintain proper oil level at all times or engine damage will result.

Check the level of the engine crankcase oil before each use.

Make sure engine is level when checking oil. See engine manual for instructions.

CHECK MOWER BLADE

See Figure 8.

Check blade mounting: blade must be secure and bolt torqued to 37.5 - 50 lbf-ft (51-68 N•m) (bolt should fully compress lock washer).

Check blade for nicks and dull cutting edges. Sharpen if necessary.

Check blade for rounded or broken ends, thinned metal or other damage. Replace if necessary.

NOTE: Blades should be sharpened and balanced professionally. Contact your Ariens Dealer.

To remove blade:

  1. Stop engine, wait for all moving parts to stop, and disconnect spark plug wire.
  2. Block blade to prevent rotation.
  3. Remove bolt, lock washer, flat washer and blade from shaft.

To install blade:

  1. Replace blade, flat washer, lock washer and bolt on shaft.
  2. Torque bolt to 37.5 - 50 lbf-ft (51-68 N·m) (bolt should fully compress lock washer).

  3. Connect spark plug wire.

Sharpen the Mower Blades

Ariens LM21SCH - Sharpen the Mower Blades - 1

CAUTION: DO NOT sharpen mower blades while on unit. An imbalanced mower blade will cause excessive vibration and eventual damage to unit. Check mower blade balance before reinstalling blades. NEVER weld or straighten bent blades.

  1. Remove mower blade from unit.

Discard mower blade if:

  • More than 1/2 in. (1.27 cm) of metal is removed.
    • Air lifts become eroded.
  • Blade is bent or broken.
  • Sharpen mower blade by removing an equal amount of material from each end of mower blade. DO NOT change angle of cutting edge or round the corner of the mower blade.

DO NOT Sharpen to This Pattern
1 2 3

DISCARD if More Than
1/2 in. (1.27 cm) 2 4 3 OT0792

Sharpen to This Pattern

  1. Square Corner
  2. Cutting Edge
  3. Air Lift
  4. Air Lift Erosion

Figure 8

  1. Check mower blade balance.
    Slide mower blade on an unthreaded bolt. A balanced blade should remain in a horizontal position. If either end of mower blade moves downward, sharpen the heavy end until blade is balanced (Figure 9).
  2. Install mower blade on unit.
  3. Tighten the bolts to a torque of 37.5 - 50 lbf-ft (51-68 N·m).

Blade Bolt Figure 9

Figure 9
OA0013

CHECK DRIVE BELT

Check drive belt and replace if worn or damaged. See Drive Belt Replacement on page 21.

CHECK FASTENERS

Check all fasteners for proper tightness. Pay special attention to blade hardware and all guards, shields and safety devices.

CHECK AIR CLEANER

See engine manual for specific information.

CHANGE ENGINE OIL

IMPORTANT: Change engine crankcase oil after first five (5) hours of operation. Then change oil after every 25 hours of operation.

Refer to engine manual for instructions and proper oil type.

IMPORTANT: Proper oil level must be maintained at all times or engine damage will result. DO NOT overfill. Be sure engine is level when adding oil.

GENERAL LUBRICATION

NOTE: LM21SCH and LM21SC have lube fittings on drive mount for use in commercial applications. Lubricate as needed.

REPLACE OIL FILTER (911526)

Replace oil filter every 100 hours of use or every season.

  1. Change engine oil.
  2. Clean around filter.
  3. Turn filter counterclockwise to remove (Figure 10).
  4. Apply a thin coat of oil onto seal of new filter.
  5. Install new filter and hand tighten securely.

Ariens LM21SCH - REPLACE OIL FILTER (911526) - 1

natural_image Close-up of a mechanical component with no visible text or symbols, labeled as Figure 10 (no readable text or symbols on the main subject)

Swivel Wheels (911101, 330, 525)

See Figure 11.

Use Sten Mix Hi-Temp Grease or equivalent on the lube fittings. Order P/N: 00036800 - 3 pack of 3 oz. cartridges.

Lube Fitting Figure 11 OM1282

CHECK SPARK PLUG

Spark plug should be replaced every 100 hours of operation or each year.

NOTE: Loose spark plug wire terminals can cause sparking. Replace terminal if damaged.

CHECK ENGINE COOLING

Ariens LM21SCH - CHECK ENGINE COOLING - 1

WARNING: HOT SURFACES can cause death or serious injury. DO NOT TOUCH parts which are hot from operation. ALWAYS allow parts to cool.

To prevent overheating, air must circulate freely around the cooling fins, cylinder head and block.

Every 100 hours of operation or yearly (more often if conditions require) remove blower housing and clean cooling fins. See engine manual for instructions.

CHECK MUFFLER

Check muffler for debris, cracks, wear, or other damage.

Ariens LM21SCH - CHECK MUFFLER - 1

CAUTION: Replace worn-out mufflers immediately. Continued use could result in fire or explosion.

SERVICE AND ADJUSTMENTS

Ariens LM21SCH - SERVICE AND ADJUSTMENTS - 1

CAUTION: AVOID INJURY. Read and understand the entire Safety section before proceeding.

SERVICE POSITION

Put unit into service position for easy access to underneath the deck.

Ariens LM21SCH - SERVICE POSITION - 1

CAUTION: Avoid fuel spills. Follow steps below to help prevent fuel spills. If fuel leaks into air cleaner, replace air cleaner. ALWAYS clean up any spilled fuel.

  1. Place unit on a flat, level surface.
  2. Disconnect spark plug wire.
  3. Remove fuel cap, place a piece of plastic bag over the opening and tighten cap securely.
  4. Tip unit onto left side, opposite the discharge opening (911330, 331, 514, 515, 525, 526, 531).

Tip unit onto right side (911099, 101, 102).

Make sure unit is secure and will not tip over.

IMPORTANT: Remove plastic from fuel cap after unit is upright and service is complete.

HANDLEBAR HEIGHT

To adjust (Figure 12 and Figure 13):

  1. Place a hole at the bottom of the braces over the pins on the bracket.
  2. On 911102 and 526, use the fasteners to attach one of the holes at the top and one of the holes at the bottom.

NOTE: To fold handlebars flat for storage, pull the speed control rod (if equipped) all the way back, disconnect braces from support bracket, and fold handlebar forward. Do not bend speed control rod.

Hole Pin Figure 12 OM1800

911102, 526 1. 2. 3. 4. 5. 2. 4. OM1660 1. Handlebar 2. Adjustment Hole 3. Support Bracket Figure 13 4. Fasteners 5. Brace

BATTERY (911331, 515)

To Remove Battery from Unit

  1. Remove drive cover.
  2. Disconnect battery plug from wiring harness on engine (Figure 14).
  3. Remove wing nuts from battery U-bolt.
  4. Remove battery plate and battery.

To Replace Battery on Unit

  1. Hold battery and battery plate in place against mower frame.
  2. Secure with U-bolt and wing nuts.
  3. Reconnect battery plug to wiring harness on engine.
  4. Replace drive cover.

To Charge Battery

IMPORTANT: DO NOT attempt to "jump start" mower.

  1. Connect battery charger plug to mating plug on battery (not engine).

IMPORTANT: Your unit shipped with either a 110- or a 220-volt battery charger. Make sure you have the correct charger for your region before charging your battery.

  1. Plug charger into an appropriate Alternating Current (A.C.) outlet.
  2. Charge for 24 to 48 hours (battery may be charged for up to 56 hours without damaging it).

At least 8 hours of engine run time are required to charge a fully discharged battery.

1. Drive Cover 2. Battery Plug 3. Battery 4. Battery Plate 5. U-Bolt 6. Wing Nuts OM1400

Figure 14

ENGINE/BLADE CONTROL ADJUSTMENT

To adjust engine/blade control:

  1. Loosen cable nuts away from bracket.

Ariens LM21SCH - ENGINE/BLADE CONTROL ADJUSTMENT - 1

natural_image Line drawing of a mechanical clamp or bracket assembly with arrows indicating movement (no text or symbols)
  1. Squeeze z-bend bracket at engine end of cable toward front of unit and hold in place.

Ariens LM21SCH - ENGINE/BLADE CONTROL ADJUSTMENT - 2

natural_image Technical diagram of a mechanical component with internal channels and a directional arrow (no text or symbols)
  1. Pull cable down from bracket until there is no slack in cable.

No slack

OM1061

  1. Tighten lower cable nut to 1/8" (3 mm) below bracket. Release z-bend bracket.

1/8" (3 mm) OM1020

  1. Tighten upper cable nut until bracket is secure between cable nuts.

Ariens LM21SCH - ENGINE/BLADE CONTROL ADJUSTMENT - 5

natural_image Mechanical diagram showing a clamp or spring mechanism with a directional arrow, labeled 'OM1030' (no text or symbols on the diagram itself)
  1. Engage engine/blade control. Measure distance between middle of z-bend and cable bracket. Measurement should be as shown below.

Briggs Engines:1.325"-1.788" (3.4 cm - 4.5 cm)

Honda Engines: 1.65"-1.69" (4.2 cm - 4.3 cm)

Ariens LM21SCH - ENGINE/BLADE CONTROL ADJUSTMENT - 6

natural_image Technical line drawing of a mechanical assembly with no visible text or symbols
  1. If correct measurement cannot be set, contact your local dealer.

DRIVE BELT REPLACEMENT

To remove drive belt:

  1. Disconnect spark plug wire.
  2. Set the right rear wheel to its lowest cutting height, and the left rear wheel to the third cutting height. This position provides clearance between friction disc and drive sheave.
  3. Remove belt from the idler, then the drive sheave, and finally, the engine pulley (Figure 15).
  4. Pull belt through opening under mower pan and over blade.
  5. Make sure the idler pulley turns and the idler arm moves freely.
  6. Reinstall drive belt in reverse order.

IMPORTANT: Be sure the belt seats in sheave and pulley grooves with the idler touching the back (flat) side of belt.

  1. Adjust rear wheels to the same cutting height.

1 2 3 4 5 6 OM1250

  1. Blade

  2. Engine Pulley

  3. Idler

  4. Bolt, Lock Washer & Flat Washer

  5. Drive Sheave

  6. Drive Belt

Figure 15

WHEEL DRIVE CONTROL ADJUSTMENT

See Figure 16.
2-1/4" to 2-3/4" (5.7 to 7 cm) 1 2 4 3 OM0294 1. Handlebar Indentation 2. Wheel Drive Control 3. Traction Cable 4. Cable Nuts Figure 16

The wheel drive must start to engage when wheel drive control is between 2-1/4" and 2-3/4" (5.7 and 7 cm) away from the handlebar.

To check:

  1. With engine off, select a slow speed.
  2. Slowly pull unit backwards.
  3. Slowly squeeze wheel drive control until wheels stop.
  4. Measure the distance between the wheel drive control and handlebar at the handlebar indentation.

To adjust:

  1. If the measurement is more than 2-3/4" (7 cm), loosen the lower cable nut and then tighten the upper cable nut against the adjuster bracket.
  2. If the measurement is less than 2-1/4" (5.7 cm), loosen the upper cable nut and then tighten the lower nut against the adjuster bracket.
  3. Recheck measurement with the slowest and fastest speeds selected.
  4. Repeat adjustment until wheel drive control is properly adjusted.

IMPORTANT: If there is not enough thread length for proper adjustment, contact your Dealer for repairs before operating unit.

SPEED CONTROL BELL CRANK

The speed control bell crank holds the speed control rod in position after a speed has been set. The spring washers may become loose with normal wear. If the speed control rod does not stay firmly in position, adjust the speed control bell crank. See Figure 17.

To adjust:

  1. Remove cover, fully compress the helical spring lock washers with lock nut and then back lock nut off, one quarter turn.
  2. If the speed control rod is still too loose, tighten lock nut by small increments until it holds its position. Tightening the lock nut too much will not allow the speed control rod to move at all.
  3. Align notch in left hand side of cover with bolt and secure with knob.

1 2 3 4 5 6 OM1670

  1. Lock Nut
  2. Helical Spring Lock Washers
  3. Speed Control Bell Crank

  4. Swivel

  5. Hair Pin
  6. Speed Control Rod

Figure 17

STORAGE

Ariens LM21SCH - STORAGE - 1

CAUTION: AVOID INJURY. Read and understand the entire Safety section before proceeding.

IMPORTANT: NEVER spray unit with high-pressure water or store unit outdoors. Store mower in a cool, dry, protected location.

Cleaning

Clean unit thoroughly with mild soap and low pressure water. Brush off dirt and debris from all surfaces. Touch up all scratched surfaces to prevent rust. Matching touch-up paint is available from your Ariens Dealer. Do not use abrasives, solvents, or harsh cleaners.

Inspection

Inspect mower and repair or replace worn or damaged parts to avoid delays when beginning use again.

Regularly check all hardware and keep fasteners tight. Know unit is in safe working condition.

Grass Bag

Wash out grass bag and allow to dry before storage. Grass bag may be stored in position on mower.

Battery

Fully charge battery and store in a cool, dry location. See Service and Adjustments.

IMPORTANT: Do not allow battery to freeze.

Engine

Close fuel shutoff valve (911099, 101, 102).

When storing unit for extended periods of time, remove all fuel from tank and carburetor (run dry). Refer to engine manual.

TROUBLESHOOTING

PROBLEM PROBABLE CAUSE CORRECTION
Engine will not startFuel tank empty or low.Fuel shutoff valve closed.Spark plug wire loose or off.Battery discharged (electric start models).Throttle control not in proper position.Engine/Blade control cable detached, broken, or not adjusted properly.Check fuel level. Fill tank if necessary.Open fuel shutoff valve.Check connection.Charge battery or replace if necessary.Adjust throttle to FAST position.Check cable. Adjust, repair or replace as necessary.
Engine is difficult to restart1. Mower clogged with grass. 1. Clear clippings from under mower. (Allow the mower to clear clippings before shutting off engine.)
Cut is poor1. Worn blade.2. Too much grass is being removed per cutting.3. Grass is too wet.4. Mowing speed is too fast.1. Check blade (seeCheck Mower Bladeon page 16).2. Raise cutting height.3. Allow grass to dry.4. Mow slower.
Grass does not disperse evenly1. Too much grass is being removed per cutting.2. Grass is too wet.3. Mowing speed is too fast.1. Raise cutting height.2. Allow grass to dry.3. Mow slower.
Mower does not bag clippings1. Grass bag is overfilled.2. Mulching plug is installed.1. Empty grass bag and do not allow it to overfill.2. Remove mulching plug.
Wheel drive does not engage1. Wheel drive control not engaged.2. Drive belt out of position.3. Drive belt worn or damaged.4. Rear wheels in different cutting heights.5. Idler spring detached.6. Wheel drive control cable detached or broken.7. Friction disc not adjusted properly or damaged.8. Bearings damaged.9. Debris in gear set.1. Engage wheel drive control.2. Check drive belt. Adjust as necessary (seeCheck Drive Belton page 17).3. Replace belt (seeCheck Drive Belton page 17).4. Adjust rear wheels to same cutting height (seeCutting Height Adjustmenton page 11).5. Attach idler spring to notch on idler arm. Contact your Dealer.6. Check wheel drive control cable. Adjust or replace as needed. SeeCheck Wheel Drive Controlon page 16.7. Contact your Dealer.8. Contact your Dealer.9. Contact your Dealer.

SERVICE PARTS

Always use genuine Ariens parts to keep your mower running like new.
Description Part Number
Air Filter 21535600 (911331, 514, 515, 525, 526)21529800 (911330, 531)21540500 (911099, 101, 102)
Oil Filter 08266101 (911526)
Spark Plug 21534100 (911331, 514, 515, 525, 526)21534300 (911330, 531)21540400 (911099, 101, 102)
Blade 0113700001176700 (911330)
Battery 51106400 (911331, 515)
Drive Belt 07217100
Friction Disc51102500 (911099, 101, 330, 331, 514, 515, 525, 531)03248300 (911102, 526)

ACCESSORIES

See your authorized Ariens Dealer to add these optional accessories.
71102400 Dethatcher
71102700 Mulchmaster Plug
71103000 Grass Bag
71103200 Rear Discharge Chute
71103500 Mulchmaster Mulching Kit
71103700 Leaf Shredder
71103900 Straight Axle Kit
71104100 Front Swivel Wheel Kit
71104300 Battery Charger 110V (911515)
71104600 Battery Charger 220V (911331)
71104700 Bag-N-Drag Bagger Kit
SPECIFICATIONS
Model Number 911099 911101 911102 91 1330 911331
Description LM21SH LM21SWH LM21SCH LM21SW LM21SE
Length - in. (cm) 61.5 (156)
Height - in. (cm) 38 (96.5)
Width - in. (cm) 23 (58.4)
Actual Weight - lbs (kg) 100 (45.3) 107 (48.8) 115 (52.2) 105 (45.7)102 (46.3)
Cutting Width- in. (cm) 21 (53.3)
Cutting Height - in. (cm)6 Positions: 1.00 - 3.25 (2.5 - 8.3)
Engine, 4 cycleHonda OHCHonda OHVBriggs & Stratton QuantumBriggs & Stratton Intek OHV
ModelGCV160GXV160123K02126607
TrimAS1AKA120120E10162E1
Engine Power - HP (kW) @ Max. Governed RPM5.1 (3.8)5.5 (4.0)3.6 (2.5)4.47 (3.33)
Max Rotation Speed of Cutting Edge - RPM ( min^-1 )3250335029003050
Governed RPM3100 ± 1503200 ± 1502800 ±1002950±100
Displacement Cu. In. (cc)9.8 (160)9.9 (163.4)12 (197)11.57 (190)
Cylinder BoreAluminumCast Iron SleeveAluminum
Engine Oil TypeSee engine manual.
Crank Case Capacity - Oz. (Liter)18.5 (0.55)22 (0.65)20 (0.59)
Oil SystemSplashForced/ SplashSplash
Engine Oil FilterN/A
Spark Plug Gap - in. (mm)0.028-0.031 (.70-.80)0.030 (0.76)0.020 (0.51)
Fuel TypeUnleaded
Fuel Tank Capacity - qt (Liter)1.2 (1.1)1.06 (1.5)1.6 (1.5)
Primer BulbN/AStandard
ThrottleN/A
Air CleanerPaper ElementPaper Element with FoamPaper Element
StartingRecoilElectric/ Recoil
DifferentialStandard
Variable Speeds - MPH (km/hr)0-4 (0-6.4)
Mower Deck14 Gauge - Stamped Steel
Front Wheel Dia - in. (cm)7.5 (19.1)
Rear Wheel Dia - in. (cm)10.5 (26.7)
SPECIFICATIONS
Model Number 911514 91155 911525 911526 911531
Description LM21S LM21SELM21SW LM21SC LM21S
Length - in. (cm) 61.5 (156)
Height - in. (cm) 38 (96.5)
Width - in. (cm) 23 (58.4)
Actual Weight - lbs (kg) 97 (44)102 (46.3)105 (45.7)110 (49.9)93 (42.2)
Cutting Width- in. (cm)21 (53.3)
Cutting Height - in. (cm)6 Positions: 1.00 - 3.25 (2.5 - 8.3)
Engine, 4 cycleBriggs & Stratton Intek OHVBriggs & Stratton Quantum
Model126602126607126602122672123K02
Trim0146E10162E10146E10211E10120E1
Engine Power - HP (kW) @ Max. Governed RPM4.37 (3.26)4.47 (3.33)4.37 (3.26)4.47 (3.33)3.6 (2.5)
Max Rotation Speed of Cutting Edge - RPM ( min^1 )29003050290029002900
Governed RPM2800±1002950±1002800 ± 1002800±1002800±100
Displacement Cu. In. (cc)11.57 (190)12 (197)
Cylinder BoreAluminumCast Iron SleeveAluminum
Engine Oil TypeSee engine manual.
Crank Case Capacity - Oz. (Liter)20 (0.59)
Oil SystemSplashPressurizedSplash
Engine Oil FilterN/ASpin-OnN/A
Spark Plug Gap - in. (mm)0.020 (0.51)
Fuel TypeUnleaded
Fuel Tank Capacity - qt (Liter)1.6 (1.5)
Primer BulbStandard
ThrottleN/AStandardN/A
Air CleanerPaper Element
StartingRecoilElectric/RecoilRecoil
DifferentialStandard
Variable Speeds - MPH (km/hr)0-4 (0-6.4)
Mower Deck14 Gauge - Stamped Steel
Front Wheel Dia - in. (cm)7.5 (19.1)
Rear Wheel Dia - in. (cm)10.5 (26.7)

Ariens

Ariens Company

655 West Ryan Street

P.O. Box 157

Brillion, WI 54110-0157

920-756-2141

Fax 920-756-2407

www.ariens.com

2-Year Limited Warranty

Ariens Company warrants to the original purchaser that consumer products manufactured by Ariens Company will be free from defects in material and workmanship for a period of two (2) years after the date of purchase, and will repair any defect in material or workmanship, and repair or replace any defective part, subject to the conditions, limitations and exclusions set forth herein.

The two-year duration of this warranty applies only if the product is put to ordinary, reasonable, and usual personal, family, or household uses. If the product is put to any business, commercial, or industrial use such as, but not limited to, commercial landscaping, mowing or snow removal services, or golf course or park maintenance, or agricultural or farmstead use, then the duration of this warranty is ninety (90) days after the date of purchase, or one (1) year after the date of purchase if the product is labeled as a Professional/Commercial Product. If any product is rented or leased, then the duration of this warranty is ninety (90) days after the date of purchase.

Genuine Ariens service parts and accessories not purchased with the product covered by this warranty, but which are later purchased and used with that product, are warranted to be free from defects in material and workmanship for a period of ninety (90) days after date of purchase, and Ariens Company will repair or replace any such part or accessory free of charge, except for labor, during that period.

This warranty is subject to the following conditions, limitations, and exclusions:

This warranty is valid only if the following conditions are met:

  • The purchaser must perform maintenance and minor adjustments explained in the owner's manual.
  • The purchaser must promptly notify Ariens Company or an authorized Ariens service representative of the need for warranty service.
  • Returning the product registration card to Ariens Company will enable the company to contact the registrant with repair or replacement part information.

This warranty is subject to the following limitations:

  • The purchaser must transport the product to and from the place of warranty service.
  • Warranty service must be performed by an authorized Ariens service representative. (To find an authorized Ariens service representative, contact Ariens Company at the website, number or address above.)
  • Batteries are warranted only for a period of twelve (12) months after date of purchase, on a prorated basis. For the first ninety (90) days of the warranty period, a defective battery will be replaced free of charge. If the applicable warranty period is more than 90 days, Ariens Company will cover the prorated cost of any defective battery, for up to twelve (12) months after the date of purchase.

The following items are not covered by this warranty:

  • Engines and engine accessories are covered only by the warranty made by the engine manufacturer, and are not covered by this warranty.
  • If the product is equipped with a Peerless gearbox and/or transmission, the gearbox and/or transmission are covered only by the warranty made by Peerless, and are not covered by this warranty.
  • If the product is equipped with a Hydro-Gear transmission and/or Hydro-Gear drive components, the Hydro-Gear transmission and/or drive components are covered only by the warranty made by Hydro-Gear, and are not covered by this warranty.
  • Parts that are not genuine Ariens service parts are not covered by this warranty.
  • Shoes, runners, scraper blades, shear bolts, string trimmer height guide, mower blades, mower vanes, trimmer line, headlights, light bulbs are not covered by this warranty.
  • Any defect which is the result of misuse, alteration, improper assembly, improper adjustment, neglect, or accident is not covered by this warranty.
  • Products which were not purchased in the United States, Puerto Rico, or Canada are not covered by this warranty. In all other countries, contact place of purchase.

LIMITATION OF REMEDY AND DAMAGES

Ariens Company's liability under this warranty, and under any implied warranty that may exist, is limited to repair of any defect in workmanship, and repair or replacement of any defective part. Ariens Company shall not be liable for incidental, special, or consequential damages (including lost profits). Some states do not allow the exclusion of incidental or consequential damages, so the above limitation or exclusion may not apply to you.

DISCLAIMER OF FURTHER WARRANTY

Ariens Company makes no warranty, express or implied, other than what is expressly made in this warranty. If the law of your state provides that an implied warranty of merchantability, or an implied warranty of fitness for particular purpose, or any other implied warranty, applies to Ariens Company, then any such implied warranty is limited to the duration of this warranty. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.

This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

Form: ALW2-122002

Ariens®

Ariens Company

655 West Ryan Street

P.O. Box 157

Brillion, WI 54110-0157

920-756-2141

Fax 920-756-2407

www.ariens.com

Ariens LM21SCH - DISCLAIMER OF FURTHER WARRANTY - 2

WARNING

Ariens LM21SCH - WARNING - 1

The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.

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Product information

Brand : Ariens

Model : LM21SCH

Category : Lawn mower