YM137 - Electric lawn mower MTD - Free user manual and instructions
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| Product Type | Electric Weed Trimmer (Edger) |
| Brand | MTD |
| Model | YM137 |
| Power Supply | 120 V ~, 60 Hz, 5.5 A |
| Motor Type | Double-Insulated Electric |
| Rotational Speed | 7,800 rpm |
| Available Speeds | 2 speeds (high and low) |
| Line Advance Mechanism | SpeedSpool® Bump Head™ |
| Line Diameter | 2.03 mm (0.080 in) |
| Line Length per Piece | 3 m (10 ft) |
| Cutting Path Diameter | 38.1 cm (15 in) |
| Weight (with accessories) | 4 kg (9 lb) |
| Shaft Length | Adjustable (adjustable D-handle) |
| Accessory Attachment System | EZ-Link™ (compatible with blower, cultivator, etc.) |
| Cutting Accessory Guard | Guard included |
| Switch | Trigger (On/Off) |
| Electrical Safety | Double insulation, polarized plug, GFCI protection recommended |
| Recommended Extension Cord | 16 AWG up to 150 ft (45.7 m), 14 AWG beyond |
| Routine Maintenance | Cleaning vents, inspecting cords, replacing line |
| Available Replacement Parts | Line (181472), line cartridge (181460), spring (181465), foam seal (181467), spool (181464), Bump button (181468) |
| Warranty | 2 years (domestic use), 90 days (commercial use) |
| Intended Use | Weeding, cutting around trees, fences, edges |
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USER MANUAL YM137 MTD
For A Growing World.

INTRODUCTION
THANK YOU
Thank you for buying this quality product. This modern outdoor power tool will provide many hours of useful service. You will find it to be a great labor-saving device. This operator's manual provides you with easy-to-understand operating instructions. Read the whole manual and follow all the instructions to keep your new outdoor power tool in top operating condition.
PRODUCT REFERENCES, ILLUSTRATIONS AND SPECIFICATIONS
All information, illustrations, and specifications in this manual are based on the latest product information available at the time of printing. We reserve the right to make changes at any time without notice.
Copyright © 2003 MTD SOUTHWEST INC, All Rights Reserved.
SERVICE INFORMATION
Service on this unit both within and after the warranty period should be performed only by an authorized and approved service dealer.
For service call 1-800-345-8746, or 1-800-668-1238 in Canada to obtain a list of authorized service dealers near you. For more details about your unit, visit our website at www.yardman.com.
If you have difficulty assembling this product or have any questions regarding the controls, operation or maintenance of this unit, please call the Customer Support Department.
DO NOT RETURN THE UNIT TO THE RETAILER. PROOF OF PURCHASE WILL BE REQUIRED FOR WARRANTY SERVICE.
TABLE OF CONTENTS
Service Information 2
Rules for Safe Operation 3
Know Your Unit 6
Assembly Instructions 7
Operating Instructions 8
Maintenance and Repair Instructions 11
Troubleshooting Chart 14
Specifications 15
Warranty Information 18
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inside Back Cover
Before beginning, locate the unit's model plate. It lists the model and serial numbers of your unit. Refer to the sample plate below and copy the information for future reference.

Copy the model and parent part number here:
Copy the serial number here:
Make sure you carefully read and understand this manual before starting or operating this equipment.
THIS PRODUCT IS COVERED BY ONE OR MORE U.S. PATENTS. OTHER PATENTS PENDING.
The purpose of safety symbols is to attract your attention to possible dangers. The safety symbols, and their explanations, deserve your careful attention and understanding. The safety warnings do not by themselves eliminate any danger. The instructions or warnings they give are not substitutes for proper accident prevention measures.
SYMBOL MEANING

SAFETY ALERT: Indicates danger, warning or caution. Attention is required in order to avoid serious personal injury. May be used in conjunction with other symbols or pictographs.
NOTE: Advises you of information or instructions vital to the operation or maintenance of the equipment.
SYMBOL MEANING

DANGER: Failure to obey a safety warning will result in serious injury to yourself or to others. Always follow the safety precautions to reduce the risk of fire, electric shock and personal injury.

WARNING: Failure to obey a safety warning can result in injury to yourself and others. Always follow the safety precautions to reduce the risk of fire, electric shock and personal injury.

CAUTION: Failure to obey a safety warning may result in property damage or personal injury to yourself or to others. Always follow the safety precautions to reduce the risk of fire, electric shock and personal injury.
- IMPORTANT SAFETY INSTRUCTIONS
READ ALL INSTRUCTIONS
BEFORE OPERATING

WARNING: When using the unit, you must follow the safety rules. Please read these instructions before operating the unit in order to ensure the safety of the operator and any bystanders. Please keep these instructions for later use.
- Read the instructions carefully. Be familiar with the controls and proper use of the unit.
- Do not operate this unit when tired, ill or under the influence of alcohol, drugs or medication.
- Children and teens under the age of 15 must not use the unit, except for teens guided by an adult.
- Inspect the unit before use. Replace damaged parts. Make sure all fasteners are in place and secure. Replace cutting attachment parts that are cracked, chipped or damaged in any way. Make sure the cutting attachment is properly installed and securely fastened. Be sure that the cutting attachment shield is properly attached, and positioned as recommended. Failure to do so can result in personal injury to the operator and bystanders, as well as damage to the unit.

DANGER: When using electric gardening appliances, basic safety precautions should always be followed to reduce the risk of fire, electric shock and personal injury. Carefully read and understand the entire operator's manual before using your unit. Pay close attention to the operating instructions and safety warnings.
- This unit was not designed to be used as a brushcutter. Do not attach or operate this unit with any type of brushcutting blade or brushcutting attachment.
- Use only a 0.080-inch (2.03 mm) diameter original equipment manufacturer replacement line. Never use metal-reinforced line, wire, chain or rope. These can break off and become dangerous projectiles.
- Be aware of risk of injury to the head, hands and feet.
- Clear the area to be cut before each use. Remove rocks, broken glass, nails, wire, string and other objects which may be thrown or become entangled in the cutting attachment. Clear the area of children, bystanders and pets; keep them outside a 50-foot (15 m.) radius, at a minimum. Even then, they are still at risk from thrown objects. Encourage bystanders to wear eye protection. If you are approached, stop the unit immediately.
ELECTRICAL SAFETY WARNINGS

WARNING: To reduce the risk of electrical shock, use only SW-A, SOW-A, STW-A, STOW-A, SJW-A, SJOW-A, SJTW-W or SJTOW-A cord types.
- Since the tool is double-insulated, a 2-wire extension cord (an extension cord without a ground) may be used. A 3-wire extension cord (an extension cord with a ground) that uses a NEMA type connector (parallel blade, U ground) is recommended. Extension cords are available from your local retailer. Use only round-jacketed extension cords approved for outdoor use.
- This tool is double-insulated. Repair or replace damaged cords.
- To reduce the risk of electrical shock, this unit has a polarized plug (one blade is wider than the other). This unit will fit with a polarized plug in one way only. If the plug does not fit fully into the unit, reverse the plug. If it still does not fit, use a cord with the correct connection. Do not modify the unit in any way.
| MINIMUM WIRE SIZE FOR EXTENSION CORDS FOR 120 VOLT APPLIANCES USING 0-12 AMPS* | ||||
| Cord length (ft.) | 25 | 50 | 100 | 150 |
| Wire size (AWG)* | 16 | 16 | 16 | 14 |
*The wire size (AWG) for appliances using 12 to 16 amps is 14 AWG for 25 feet, 12 AWG for 50 feet, and not recommended for 100 or 150 feet.
- CORD SETS: Make sure your cord set is in good condition, with a cord that is heavy enough to carry the current that your unit will draw. An undersized cord set will cause a drop in line voltage resulting in a loss of power, as well as overheating. The table shown above illustrates the correct size to use depending on the cord length and nameplate amperage rating. If in doubt, use the next heavier size line gauge. The smaller the gauge number, the heavier the cord. To prevent the cord from disconnecting from the unit, use the cord hook shown in the Operating Instructions.
- Ground Fault Circuit Interruption (GFCI) protection should be provided on the circuit(s) or outlet(s) that will be used for the unit. Use receptacles with built-in GFCI protection for an extra measure of safety.
- Do not abuse the power cord. Never carry the unit by the cord or yank the cord to disconnect from receptacle. Keep the cord from heat, oil and sharp edges.
- A nameplate on your unit indicates the voltage used. Never connect the unit to an AC voltage that differs from this voltage.
- Inspect all extension cords and the unit power connection periodically. Look closely for deterioration, cuts or cracks in the insulation. Also inspect the connections for damage. Repair or replace the cords if any defects appear.
- Avoid dangerous environments. Never operate your unit in damp or wet conditions. Moisture is a shock hazard.
- Do not use the unit in the rain.
- Do not handle the plug or the unit with wet hands.
WHILE OPERATING
- Wear safety glasses or goggles that are marked as meeting ANSI Z87.1-1989 standards. Also wear ear/hearing protection when operating this unit. Wear a face or dust mask if the operation is dusty. Long sleeve shirts are recommended.
-
Wear heavy, long pants, boots and gloves. Do not wear loose clothing, jewelry, short pants, sandals or go barefoot. Secure hair above shoulder level.
-
The cutting attachment shield must always be in place while operating the unit. Do not operate unit without both trimming lines extended, and the proper line installed. Do not extend the trimming line beyond the length of the shield.
- Adjust the D-handle to your size to provide the best grip.
- Be sure the cutting attachment is not in contact with anything before starting the unit.
- Use the unit only in daylight or good artificial light.
- Avoid accidental starting. Do not carry around a unit that is plugged in with your finger on the trigger switch. Be sure the switch is in the off position when plugging in the unit.
- Use the right tool. Only use this tool for its intended purpose.
- Do not overreach. Always keep proper footing and balance.
- Always hold the unit with both hands when operating. Keep a firm grip on both handles or grips.
- Keep hands, face, and feet at a distance from all moving parts. Do not touch or try to stop the cutting attachment when it rotates.
- Always stop the motor when cutting is delayed or when walking from one cutting location to another.
- If you strike or become entangled with a foreign object, stop the motor immediately and check for damage. Do not operate before repairing damage. Do not operate the unit with loose or damaged parts.
- Stop the unit and unplug it for maintenance or repair.
- Use only genuine original equipment manufacturer replacement parts and accessories for this unit. These are available from your authorized service dealer. Use of any non-original parts or accessories could lead to serious injury to the user, or damage to the unit, and void your warranty.
- Keep unit clean of vegetation and other materials. They may become lodged between the cutting attachment and shield.
OTHER SAFETY WARNINGS
- Be sure to secure the unit while transporting.
- Store the unit in a dry area, locked up to prevent unauthorized use or damage, and stored in a high place out of the reach of children.
- Never douse or squirt the unit with water or any other liquid. Keep handles dry, clean and free from debris. Clean after each use. See the Cleaning and Storage instructions.
- Keep these instructions. Refer to them often and use them to instruct other users. If you loan someone this unit, also loan them these instructions.
SAVE THESE INSTRUCTIONS
SAFETY AND INTERNATIONAL SYMBOLS
This operator's manual describes safety and international symbols and pictographs that may appear on this product. Read the operator's manual for complete safety, assembly, operating and maintenance and repair information.
SYMBOL MEANING

- SAFETY ALERT SYMBOL
Indicates danger, warning, or caution. May be used in conjunction with other symbols or pictographs.

WARNING - READ OPERATOR'S MANUAL
Read the Operator's Manual(s) and follow all warnings and safety instructions. Failure to do so can result in serious injury to the operator and/or bystanders.

- WEAR EYE AND HEARING PROTECTION
WARNING: Thrown objects and loud noise can cause severe eye injury and hearing loss. Wear eye protection meeting ANSI Z87.1-1989 standards and ear protection when operating this unit. Use a full face shield when needed.

- THROWN OBJECTS AND ROTATING CUTTER CAN CAUSE SEVERE INJURY
WARNING: Keep clear of blower outlet. Never point the blower at yourself or others. Objects can be thrown from blower. Do not operate unit without proper attachments and guards in place.
SYMBOL

MEANING
DO NOT USE IN THE RAIN WARNING: Avoid
dangerous environments. Never operate your unit in the rain, or in damp or wet conditions. Moisture is a shock hazard.

- KEEP BYSTANDERS AWAY
WARNING: Keep all bystanders, especially children and pets, at least 50 feet (15 m.) from the operating area.

- THROTTLE CONTROL
Indicates "HIGH" or "FASTEST" speed.

- THROTTLE CONTROL
Indicates "IDLE", "LOW" or "SLOWEST" speed.

- DOUBLE INSULATED
Two systems of insulation are provided instead of grounding. There is no grounding provided and no means of grounding should be added to this unit.
Cutting grass and light weeds
- Decorative trimming around trees, fences, etc.

ASSEMBLY INSTRUCTIONS
On some units, the D-handle may be pre-installed. In this case you must loosen screws and adjust the handle to fit the operator. Go to step 4 if the D-handle is pre-installed.
INSTALL AND ADJUST THE D-HANDLE
- Remove the items that were installed on the D-handle for shipping.
- Place the D-handle over the shaft housing and push it on the boom (Fig. 1).
3, Install the bolt, washer and wing nut. Tighten them.

Fig. 1
- If the D-handle was pre-installed, loosen the wing nut on it just enough so it is movable.
- While holding the unit in the operating position, arrange or rotate the D-handle to the location that provides you the best grip (Fig. 2).
- Tighten the wing nut until the D-handle is secure.

Fig. 2
INSTALL THE CUTTING ATTACHMENT SHIELD
Use the following instructions if the cutting attachment shield on your unit is not installed or if you ever need to re-install it.

WARNING: Never operate the trimmer without the cutting attachment shield in place to prevent serious personal injury.
- Slide the cutting attachment shield into the shield mount on the cutting attachment. Align the screw holes in the shield with the holes in the cutting attachment (Fig. 3).

Fig. 3
- Place a hex lock nut into one of the three recessed holes on the top of the cutting attachment shield (Fig 4).

Fig. 4
- Install a screw into the hole from the bottom of the cutting attachment shield and screw it into the nut installed in step 2 (Fig 5). Do not tighten.
- Repeat steps 2 and 3 until all three screws have been started, then tighten securely.

Fig. 5
OPERATING INSTRUCTIONS
Blower/Vacuum BV720r
Cultivator GC720r
Edger LE720r
Snow Thrower ST720r
Straight Shaft Trimmer SS725r
TreePruner TP720r
Turbo Blower . TB720r

WARNING: Prior to operation, read and understand the operator's manual for unit to be used with this add-on.
Removing the Cutting Attachment or Add-Ons
- Turn the knob counterclockwise to loosen (Fig. 6).
- Press and hold the release button (Fig. 6).
- While firmly holding the upper shaft housing, pull the cutting attachment or add-on straight out of the EZ-Link™ coupler (Fig. 7).

WARNING: To avoid serious personal injury and damage to the unit, shut the unit off before removing or installing add-ons.
Installing the Cutting Attachment or Add-Ons
NOTE: To make installing or removing the add-on easier, place the unit on the ground or on a work bench.
1. Turn knob counterclockwise to loosen (Fig. 6).

EZ-Link™ Coupler
Release Button
Fig. 6
- While firmly holding the add-on, push it straight into the EZ-Link™ coupler (Fig. 7).
NOTE: Aligning the release button with the guide recess will help installation (Fig. 6).

Fig. 7
- Turn the knob clockwise to tighten (Fig. 8).

CAUTION: Lock the release button in the primary hole (Fig. 10) and securely tighten the knob before operating this unit.

Fig. 8

CAUTION: The add-ons with the coupler system is to be used in the primary hole only. Using the wrong hole could lead to personal injury or damage to the unit.
For decorative trimming/edging with the line head cutting attachment, lock the release button of the cutting attachment into the 90^ hole or the 180^ hole (Fig. 8).
For edging with the edger add-on, lock the release button of the cutting attachment only into the 180^ trimming hole/ primary hole (Fig. 8).
OPERATING INSTRUCTIONS
CONNECTING THE CORD
Use the cord hook when connecting the extension cord to the power cord outlet. This helps prevent any disconnection.
- Make a narrow loop with the extension cord.
- Push the loop through the opening and move it onto the hook on the motor housing (Fig. 9).
- Plug the cord properly into the socket.
Only use outdoor-approved extension cords. Cord sets are specified in the Important Safety Information section.

Fig. 9
STARTING/STOPPING INSTRUCTIONS
Once the unit is plugged in, stand in the operating position (Fig. 11). Squeeze the trigger to start the unit. To stop the unit, release the trigger (Fig. 10).

WARNING: Always wear eye, hearing, foot and body protection to reduce the risk of injury when operating this unit.

Fig. 10
TWO-SPEED SWITCH
This unit is equipped with a two-speed switch: a powerful high speed for demanding yard work, and a precision low speed for light-duty yard work.
Push the switch up for high speed trimming. Push the switch down for low speed trimming (Fig. 10).
HOLDING THE TRIMMER

WARNING: Always wear eye, hearing, foot and body protection to reduce the risk of injury when operating this unit.
Before operating the unit, stand in the operating position (Fig. 11). Check for the following:
- The operator is wearing eye protection and proper clothing
- With a slightly-bent right arm, the operator's hand is holding the shaft grip
- The operator's left arm is straight, the left hand holding the D-handle
The unit is at waist level - The cutting attachment is parallel to the ground and easily contacts the grass without the need to bend over
- The extension cord is safely behind the operator

Fig. 11
ADJUSTING TRIMMING LINE LENGTH
The Bump Head™ cutting attachment allows you to release trimming line without stopping the motor. To release more line, lightly tap the cutting attachment on the ground (Fig. 12) while operating the trimmer at high speed.
NOTE: Always keep the trimming line fully extended. Line release becomes more difficult when the cutting line gets shorter.
OPERATING INSTRUCTIONS
Each time the head is bumped, about 1 inch (25.4 mm) of trimming line releases. A blade in the cutting attachment shield will cut the line to the proper length if any excess line is released.
For best results, tap the bump knob on bare ground or hard soil. If you attempt a line release in tall grass, the motor may stall. Always keep the trimming line fully extended. Line release becomes more difficult when the cutting line gets shorter.
NOTE: Do not rest the Bump Head™ on the ground while the unit is running.
Some line breakage will occur from:
- Entanglement with foreign matter
Normal line fatigue - Attempting to cut thick, stalky weeds
- Forcing the line into objects such as walls or fence posts

Fig. 12

CAUTION: Do not remove or alter the line cutting blade assembly. Excessive line length will make the clutch overheat. This may lead to serious personal injury or damage to the unit.
TIPS FOR BEST TRIMMING RESULTS
- Keep the cutting attachment parallel to the ground.
- Do not force the cutting attachment. Allow the tip of the line to do the cutting, especially along walls. Cutting with more than the tip will reduce cutting efficiency and may overload the motor.
-
Cut grass over 8 inches (200 mm) by working from top to bottom in small increments to avoid premature line wear or motor drag.
-
Cut from right to left whenever possible. Cutting to the left improves the unit's cutting efficiency. Clippings are thrown away from the operator.
- Slowly move the trimmer into and out of the cutting area at the desired height. Move either in a forward-backward or side-to-side motion. Cutting shorter lengths produces the best results.
- Trim only when grass and weeds are dry.
-
The life of your cutting line is dependent upon:
-
Following the trimming techniques
What vegetation is being cut
Where vegetation is cut
For example, the line will wear faster when trimming against a foundation wall as opposed to trimming around a tree.
DECORATIVE TRIMMING
Decorative trimming is accomplished by removing all vegetation around trees, posts, fences and more.
Rotate the whole unit so that the cutting attachment is at a 30^ angle to the ground (Fig. 13).

Fig. 13
MAINTENANCE AND REPAIR INSTRUCTIONS
SERVICING DOUBLE INSULATED UNITS
This unit is double-insulated. In a double-insulated unit, two systems of insulation are provided instead of grounding. There is no grounding provided and no means of grounding should be added to this unit.
Extreme care and knowledge of the system is required when servicing a double-insulated unit. Service should be performed by qualified service personnel only. Replacement parts for a double-insulated unit must be identical to the parts they replace. Refer any repair to an authorized service dealer. A double-insulated unit is marked with the words "double insulation" or "double insulated."
LINE INSTALLATION FOR THE SPEEDSPOOL®

WARNING: Never use metal-reinforced line, wire, chain or rope. These can break off and become dangerous projectiles.
Always use original equipment manufacturer 0.080 inch (2.03mm) replacement line. Line other than the specified may make the motor overheat or fail.
There are two methods to replace the SpeedSpool® trimming line:
- Wind the inner reel with new line
Install a pre-wound inner reel
Winding the Inner Reel With New Line
NOTE: It Is unnecessary to remove the bump knob to install a new trimming line.
- Cut two pieces of 0.080 inch (2.03 mm) trimming line, 10 feet (3 m) long.
- Hold the outer spool and turn the inner reel counterclockwise to line up the arrows on the outer spool and inner reel (Fig. 14).

WARNING: Always use the correct line length when installing trimming line on the unit. The line may not release properly if the line is too long.

Fig. 14
- Pull old line out of the line loading and line locking holes (Fig. 14 and 15).
- Insert a piece of trimming line straight into one of the two eyelets in the outer spool. Push it up through the line loading hole in the inner reel (Fig. 15). Do not bend the line when inserting it into the eyelet.

Fig. 15
- Insert the line into the locking hole. Do not push the line more than a 1/2 inch (12.7 mm) into the line locking hole. The line will form a small loop (Fig. 16) when it is inserted correctly.
MAINTENANCE AND REPAIR INSTRUCTIONS

Fig. 16
- Pull the line from the outer spool until the line is tight against the inner reel (Fig. 17).

Fig. 17
- Repeat procedures 4-6 with the second piece of line.
- Hold the outer spool. Wind the inner reel counterclockwise until approximately four (4) inches (102 mm) of line remain (Fig. 18).
NOTE: Do not wind the inner reel before installing the second piece of line.

Fig. 18
- If winding the line becomes difficult or if the line jams, pull the ends of the line from the spool (Fig. 19). Continue winding the inner reel counterclockwise.

Fig. 19
INSTALLING A PRE-WOUND REEL
- Turn the bump knob counterclockwise and remove the bump knob, spring and foam seal (Fig. 20).

Fig. 20
- Pull the old inner reel with existing line from the outer spool.
- Insert the ends of the prewound inner reel line into the outer spool eyelets (Fig. 21). Push the new inner reel, arrow side up, into the outer spool.

Fig. 21
- Hold the inner reel in place and install the bump knob, spring and foam seal. Press down and turn the bump knob clockwise. Grasp the ends and pull firmly to release the line from the holding slots in the inner reel (Fig. 19).
MAINTENANCE AND REPAIR INSTRUCTIONS
Releasing the Inner Reel
If the SpeedSpool® does not release line correctly, pull the ends of the line firmly from the spool (Fig. 19). If this does not the release line, follow the Cleaning the SpeedSpool® instructions.
CLEANING THE SPEEDSPOOL®
Cleaning the SpeedSpool® may be necessary if:
- A jammed or excessive line must be removed
- The SpeedSpool® becomes difficult to wind or does not operate correctly when bumping the head on the ground
- Hold the outer spool, and unscrew the bump knob counterclockwise (Fig. 22).
- Pull out the bump knob, spring and foam seal (Fig. 20).

Fig. 22
- Pull the inner reel with existing line from the outer spool (Fig. 21).
- Remove any existing line from the inner reel before cleaning. Remove any debris or grass from the knob, spring, inner reel and foam seal. Wash the inner reel with warm soapy water (Fig. 23).

Fig. 23
- Clean the shaft and the inner surface of the outer spool. To clean the shaft underneath the plunger, press down on the plunger (Fig. 24). Remove any dirt or debris from the shaft.
NOTE: The inner reel must be totally dry before reinstalling it into the outer spool. Do not lubricate the inner reel or outer spool assembly. - Place the inner reel into the outer spool.

Fig. 24
- Place the bump knob, spring and foam seal into the inner reel (Fig. 20).
- Press the bump knob down and tighten clockwise.
- Install new line as described in Line Installation for the SpeedSpool®.
SPEEDSPPOOL REPLACEMENT PARTS
Replacement Line 181472
Replacement Line Cartridge 181460
Inner Reel Spring 181465
Foam Seal 181467
Inner Reel 181464
Bump Knob Assembly 181468
These SpeedSpool® replacement parts can be purchased from your local authorized dealer.
CLEANING THE UNIT

WARNING: To avoid serious personal injury, always turn your unit off and unplug it before you clean or service it.
Switch off the unit and disconnect it from the power source. Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners that contain aromatic oils such as pine and lemon, and solvents such as kerosene, can damage plastic housing or handle. Wipe off any moisture with a soft cloth. Also keep the air vents free of obstructions.
STORAGE
- Store the unit locked up to prevent unauthorized use or damage.
- Store the unit in a dry, well-ventilated area.
- Store the unit out of the reach of children.
INSPECT EXTENSION CORDS
Inspect all extension cords periodically. Look closely for deterioration, cuts or cracks in the insulation. Inspect the connectors for damage. Replace cords if defective or damaged.
TROUBLESHOOTING
MOTOR WILL NOT START
CAUSE
Unit is unplugged
ACTION
Check cord to make sure it is still plugged into an electrical outlet
CUTTING ATTACHMENT WILL NOT ADVANCE LINE
CAUSE
Cutting attachment bound with grass
Cutting attachment out of line
Inner reel bound up
Cutting head dirty
Line welded
Line twisted when refilled
Not enough line is exposed
ACTION
Stop the motor and clean cutting attachment
Refill with new line
Replace the inner reel
Clean inner reel and outer spool
Disassemble, remove the welded section and rewind
Disassemble and rewind the line
Push the bump knob and pull out line until 4 inches (102 mm) of line is outside of the cutting attachment
CUTTING LINE ADVANCES UNCONTROLLABLY
CAUSE
Oil, cleaner or lubricant in cutting head
ACTION
Clean and thoroughly dry the cutting head
If further assistance is required, contact your authorized service dealer.
SPECIFICATIONS
MOTOR
Motor type. A.C., 120 Volts Electric
Operating RPM up to 7,800 rpm
Ignition Switch Trigger
Amperage 5.5 amps
DRIVE SHAFT and CUTTING ATTACHMENT
Drive Shaft Housing. Steel (EZ-Link)
Shoulder Strap Optional
Approximate Unit Weight (cutting attachment shield and D-handle) 9 lbs. (4 kg)
Cutting Mechanism SpeedSpool® Dual String Cutting Head
Line Spool Bump Line Releaser
Line Spool Diameter 3 inches (76.2 mm)
Cutting Path Diameter. 15 in (381 mm)
Trimming Line Diameter 0.080 in (2.03 mm)
NOTES
NOTES
MANUFACTURER'S LIMITED WARRANTY FOR:
YaRD-Man)byMTD
The limited warranty set forth below is given by MTD LLC ("MTD") with respect to new merchandise purchased and used in the United States, its possessions and territories.
MTD warrants this product against defects in material and workmanship for a period of two (2) years commencing on the date of original purchase and will, at its option, repair or replace, free of charge, any part found to be defective in material or workmanship. This limited warranty shall only apply if this product has been operated and maintained in accordance with the Operator's Manual furnished with the product, and has not been subject to misuse, abuse, commercial use, neglect, accident, improper maintenance, alteration, vandalism, theft, fire, water or damage because of other peril or natural disaster. Damage resulting from the installation or use of any accessory or attachment not approved by MTD for use with the product(s) covered by this manual will void your warranty as to any resulting damage. This warranty is limited to ninety (90) days from the date of original retail purchase for any MTD product that is used for rental or commercial purposes, or any other income-producing purpose.
HOW TO OBTAIN SERVICE: Warranty service is available, WITH PROOF OF PURCHASE THROUGH YOUR LOCAL AUTHORIZED SERVICE DEALER. To locate the dealer in your area, please check for a listing in the Yellow Pages or contact the Customer Service Department of MTD LLC by calling 1-800-345-8746 or writing to P.O. Box 361131, Cleveland OH 44136-0019 or if in Canada call 1-800-668-1238. No product returned directly to the factory will be accepted unless prior written permission has been extended by the Customer Service Department of MTD LLC.
This limited warranty does not provide coverage in the following cases:
A. Tune-ups - Spark Plugs, Carburetor Adjustments, Filters.
B. Wear items - Bump Knobs, Outer Spools, Cutting Line, Inner Reels, Starter Pulley, Starter Ropes, Drive Belts.
C. MTD does not extend any warranty for products sold or exported outside of the United States of America, its possessions and territories, except those sold through MTD's authorized channels of export distribution.
MTD reserves the right to change or improve the design of any MTD Product without assuming any obligation to modify any product previously manufactured.
No implied warranty, including any implied warranty of merchantability or fitness for a particular purpose, applies after the applicable period of express written warranty above as to the parts as identified. No other express warranty or guaranty, whether written or oral, except as mentioned above, given by any person or entity, including a dealer or retailer, with respect to any product shall bind MTD. During the period of the Warranty, the exclusive remedy is repair or replacement of the product as set forth above. (Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.)
The provisions as set forth in this Warranty provide the sole and exclusive remedy arising from the sales. MTD shall not be liable for incidental or consequential loss or damages including, without limitation, expenses incurred for substitute or replacement lawn care services, for transportation or for related expenses, or for rental expenses to temporarily replace a warranted product. (Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.)
In no event shall recovery of any kind be greater than the amount of the purchase price of the product sold. Alteration of the safety features of the product shall void this Warranty. You assume the risk and liability for loss, damage, or injury to you and your property and/or to others and their property arising out of the use or misuse or inability to use the product.
This limited warranty shall not extend to anyone other than the original purchaser, original lessee or the person for whom it was purchased as a gift.
How State Law Relates to this Warranty: This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
To locate your nearest service dealer dial 1-800-345-8746 in the United States or 1-800-668-1238 in Canada.
MTD LLC
P.O. Box 361131
Cleveland, OH 44136-0019
YaRD-Man) by MTD
RÉFERENCES, ILLUSTRATIONS ET SPECIFICATIONS RELATIVES AU PRODUIT
For A Growing World.

Item Part No. Description
1 791-180300 Screw, Housing Set (Qty. 11)
2 791-145569 Anti-Rotation Screw
3 753-04608 Motor Housing Assembly
4 791-180302 Two-Speed Switch Assembly
5 791-180559 Lead Wires
6 791-180150 Switch
7 791-182318 Trigger
8 791-180305 Terminal Block
9 791-180154 Motor Assembly (includes 11 & 12)
10 791-180152 Driver
791-180155 Cooling Fan
791-181645 Recessed Plug Assembly
BOOM AND TRIMMER PARTS - MODEL YM137 120 VOLT ELECTRIC TRIMMER

Item Part No. Description
1 791-610327 Shoulder Harness Clamp
2 791-153064 D-Handle
3 791-181587 D-Handle Hardware Assembly
4 753-04345 Upper Drive Shaft Housing Assembly
5 791-182928 Split Boom Coupler (includes 6-9)
6 791-182057 Screw
7 791-181617 Bolt
8 791-181951 Adjustment Knob
9 791-181886 Knob Retaining Nut
10 753-1212 Lower Drive Shaft Housing Assembly
11 791-181166 Flexible Drive Shaft
791-153597 Lower Clamp Assembly
13 791-180547 Guard Mounting Hardware
14 791-180548 Guard Assembly
15 791-180553 Blade Assembly
16 791-145569 Anti-Rotation Screw
17 791-181566 Gearbox (includes 16)
18 791-181457 Outer Spool Assembly (includes 19)
19 791-181458 Retainer
20 791-181561 Thrust Washer
21 791-181459 Small Spring
22 791-181461 Slider
23 791-181532 E-Clip
24 791-181531 Spring
25 791-181462 Plunger
26 791-181463 C-Clip
27 791-181464 Inner Reel
28 791-181465B Large Spring
29 791-181467 Foam Seal
30 791-181468B Bump Knob Assembly (includes 28 & 29)
Optional Accessories
- 791-181472 .080" Replacement Line (Eight - 10 foot lengths)
- 791-181470 Complete Cutting Head Assembly (includes 16-30)
- 791-181460 Reel and Line Assembly
- 791-682075 Shoulder Strap Harness
* not shown
