DB7404 - Snow blower Cotech - Free user manual and instructions

Product Type	Snow blower
Brand	Cotech
Model	DB7404
Type	One-stage
Clearing Width	530 mm
Max Snow Depth	Approximately 250 mm
Discharge Range	Approximately 6 m
Engine Displacement	123 cc
Engine Power	4 HP
Fuel Type	Unleaded petrol (95-98 octane)
Fuel Tank Capacity	2.1 L
Oil Capacity	600 ml
Oil Type	SAE 5W-30 4-stroke engine oil (SG/SF)
Chute Rotation	180° swivel
Discharge Angle Adjustment	70°
Wheel Type	Pneumatic rubber, diameter 190 mm
Sound Pressure Level	86 dB(A) (K=1.5 dB(A))
Sound Power Level	97 dB(A) (K=1.5 dB(A))
Vibration Level	15.0 m/s² (K=1.5 m/s²)
Weight	40 kg
Ignition	Key start
Feed Screw	Rubber blade (replaceable)
Shave Blade	Adjustable and replaceable
Drive Belt	Replaceable
Safety Features	Ignition key, clutch lever, safety guards

Frequently Asked Questions - DB7404 Cotech

How do I start the Cotech DB7404 snow blower?

First, check oil and fuel levels. Insert the ignition key fully into the ignition (it cannot be turned, but ensure it is fully inserted). Set the choke to cold start if the engine is cold. Push the primer bladder 3 times, covering the vent hole. Slowly pull the starter handle until resistance, then pull quickly to start. Once warm, move the choke to its original position.

What type of fuel and oil should I use?

Use 95 or 98 octane unleaded petrol for fuel. For oil, use SAE 5W-30 grade 4-stroke petrol engine oil (service category SG or SF). The oil capacity is 600 ml. Always check and fill oil before first use.

How do I adjust the chute direction?

Loosen the wing knobs on the chute's hood to set the desired discharge angle (up to 70°). The chute swivels 180° using the chute directional handle. Tighten the wing knobs after adjustment.

How do I change the drive belt?

Disconnect the spark plug cable. Remove the protective cover (4 screws). Remove the belt from the feed screw pulley. Press the tensioner wheel down to release the belt from the tension tab. For reinstallation, press the tensioner wheel down, route the belt under the tab, and reinstall on the pulley. Adjust the clutch lever wire if needed. Replace the cover.

What should I do if the engine does not start?

Check that the ignition key is fully inserted and the spark plug cable is connected. Ensure fuel is fresh and not old. Clean or replace fuel lines if clogged. Prime the engine 3–5 times. If flooded, wait 10 minutes before restarting. Clean or replace the spark plug if needed.

How do I adjust or replace the shave blade?

Empty the fuel tank when cold. Tilt the blower forward so wheels are off the ground. Loosen the 4 screws on the shave blade. Adjust to a position where wheels, shave blade, and feed screw contact the ground evenly. For replacement, remove the old blade and install a new one, then retighten screws.

What safety precautions should I follow?

Always read the manual before use. Wear ear defenders and eye protection. Keep hands and feet away from rotating parts. Never insert hands into the discharge chute. Use in well-ventilated areas to avoid carbon monoxide poisoning. Refuel only when the engine is cool. Keep children and bystanders at a safe distance.

How should I store the snow blower for long periods?

Empty the fuel tank when the engine is cold. Start the engine and run it until it stops to remove remaining fuel. Store in a well-ventilated area away from open flames, sparks, or heat sources.

How do I change the rubber feed screw blade?

Loosen the 4 retaining screws on the feed screw. Remove the old blade and replace with a new one. Tighten the retaining bolts securely.

What is the recommended maintenance schedule?

Check oil level before each use. Change oil after the first 5 hours, then every 25 hours or each season. Check spark plug every 25 hours. Clear area around muffler every use. Lubricate clutch lever attachment points before each season.

USER MANUAL DB7404 Cotech

Read the entire instruction manual carefully and make sure that you fully understand it before you use the equipment. Keep the manual for future reference.

Viktig information:

Line drawing of a lawn mower with handle and wheels (no text or symbols)

ART.NO MODEL

31-4818 DB7404

Ver. 201210

Original instructions

Bruksanvisning i original

Please read the entire instruction manual before use and save it for future reference. We reserve the right for any errors in text or images and for making any necessary technical changes to this document. If you should have any questions concerning technical problems please contact our Customer Services.

Safety

STOP

Read the entire instruction manual before use.

Use ear defenders.

Wear eye protection.

Danger – rotating feed screw.

Beware of flying objects. Make sure on-lookers are kept at a safe distance.

Never touch any of the machine's moving parts until they have stopped completely, the machine has been turned off and the ignition key has been removed.

Never insert your hands into the discharge chute.

Keep unauthorised persons a safe distance away from the machine.

Danger - Petrol is highly flammable. Let the machine cool for at least 2 minutes before refueling.

Never start the machine indoors or in a poorly ventilated area. The engine's exhaust contains deadly carbon monoxide.

General safety precautions

• Read carefully through the instructions and inform yourself about all controls and functions and how to correctly use the snow blower.
• Never let children or others who do not have the adequate knowledge of these instructions use the snow blower. Local ordinances can have restrictions regarding the user's age.
• Never use the machine in the vicinity of others, especially children or animals.
• Remember the user/driver is always ultimately responsible for accidents caused by use of the product.
• Be careful of falling or slipping while the snow blower is in reverse.
• Never use the snow blower whilst under the influence of drugs, alcohol or medicine. Do not use the product if you are tired or sick.
• This product may only be repaired by qualified staff and only using original parts.
• Never use accessories not approved for use by the manufacturer or the retailer where the product was purchased.

Safety precautions during use

• Make sure to keep hands and feet away from rotating parts. Avoid the discharge chute.
• Certain engine parts will become very hot during use. Risk for burn injuries.
• The snow blower cannot be used for any other purpose than for removing snow.
• Be careful when using on gravel paths, pavement and roads. Be attentive for possible hazards and nearby traffic. Avoid steep inclines.
• Never point the discharge chute towards public roads or traffic.
• Stop the engine immediately if you have struck a foreign object. Inspect the machine carefully after such an incident. Do not reuse the snow blower until any possible damage has been repaired.
• If the snow blower begins to vibrate abnormally, turn off the engine immediately and find the cause. Vibrations are normally a sign of problems.
• Existing safety features may not be disconnected or made inoperative.
• Never use the snow blower in the vicinity of fences, cars, windows, inclines, etc. without properly adjusting the discharge chute.
  • Always keep children away from areas to be cleared of snow.
• Never overload the blower by driving it too fast.
• Be very careful when reversing. Always look behind you for possible obstacles.
• Never point the chute towards onlookers. Never let anyone stand in front of the snow blower.
• Never use the snow blower in conditions of inadequate visibility or improper lighting.
  • Make sure you are steadily balanced and have a firm grip on the handles while using the snow blower.
• Never use the snow blower on the roof.

Pre-operational precautions

• Make sure that the area being cleared is free from loose and foreign objects.
  • Disengage all controls before starting the engine.
• Make sure that the controls are easily manoeuvrable and that they return to their original position when released.
• Pre-plan the area to be cleared in order to avoid personal or property damage by flying objects.
• Never use the snow blower without proper clothing. Use appropriate footwear with solid traction especially in slippery conditions.
• Under no circumstances may maintenance and service be performed when the engine is on (if not otherwise instructed by the instruction manual).
  • Always use safety glasses or a visor when operating, servicing or carrying out maintenance.
• Let the snow blower adjust to outdoor temperatures before using.

Fuelling precautions

Note: Petrol is highly flammable.

• Use 95 or 98 octane unleaded petrol.
• Store the fuel in a container that is suitable for petrol.
  • Always fill the container outdoors and do not smoke while filling.
• Do not overfill! The fuel level should be a few centimetres from full.
• Fill with fuel before starting the engine. Never open the fuel cap for filling when the engine is running or when warm.
• Replace the fuel cap securely and wipe off any excess fuel.

Controls and functions

1. Shave blade
2. Rubber feed screw
3. Chute
4. Chute directional handle
5. Fuel cap
6. Primer

7. Ignition

8. Starter handle

9. Feed screw clutch lever
10. Oil drain screw
11. Dipstick/oil fill
12. Muffler
13. Spark plug/spark plug cable
14. Choke

Installation

Contents

• Snow blower
• Chute with lock ring
• Spark plug spanner
  • 2 ignition/safety keys
• Instruction manual

Feed screw clutch lever and wire

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1. Pull up the handle and tighten the two wing nuts.

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1. Remove the wire bracket on the handle and pull up the wire sleeve a little to make it easier to attach the wire to the clutch lever.
2. Connect the wire to the bottom hole in the clutch lever. Screw the wire bracket back on.

Chute

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1. Make sure the chute's metal position lock sits securely in its catch.

2. Hold the chute in place and put on the lock ring.

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1. Secure the snap lock on the lock ring.

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1. Loosen the wing knobs on the chute's hood to set the desired discharge angle. Tighten the wing knobs.

Operation

Oil level checks and refills

Note: The snow blower comes without engine oil. Oil must be filled before using the snow blower. Engine oil capacity is 600 ml.

• Use SAE 5W-30 grade 4-stroke petrol engine oil, service category SG, SF.
• Unscrew the dipstick and fill up with engine oil so that the level is within the recommended markings on the dipstick. Do not overfill!

Handy hint: Ask for help to tilt up the snow blower to make oil filling easier.

Note: Do not screw the dipstick cap into place when measuring. Hold it flush against the filling hole to measure.

IMPORTANT:

The oil should be changed after the first 5 hours of use.

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Fuelling

Fill with 95 or 98 octane unleaded petrol following the Fuelling precautions procedures described above.

Start

Note: Check the oil and fuel levels before starting.

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1. Insert the ignition key completely into the ignition. The key can not be turned, but make sure it is fully inserted.

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1. Make sure the choke is set to cold start mode. Do not use the choke if the engine is warm.

2. Push the primer bladder 3 times. Cover the vent hole in the centre of the primer bladder when pushing. In cold weather conditions the engine may need to be primed again. If the engine is warm, press the primer once.

3. Slowly pull the starter handle until you feel some resistance. Use a quick and powerful motion when pulling the handle to start. Do not release the handle but keep it in position and then return it to its original position.
4. Once the engine has been started and is warm, slowly move the choke to its starting position.
5. If the engine should stall, restart it with the choke set in the middle position for a short time. Once the engine is stable, slowly return the choke to its original position.

Operation

1. Plan the area of operation and where the snow is to be removed before starting.

2. Clasp the clutch lever and bring it in towards the handle to begin snow clearance and start the feed screw.

3. Release the lever to stop.

Note: Since the snow blower is driven by the feed screw and has no power to the wheels, it may be necessary to lift the handle somewhat to allow the feed screw to have better contact with the surface. Depending on the surface, it may also be necessary to push the machine forward somewhat to achieve forward progress.

1. Push the handle down somewhat to lift the feed screw from the surface when backing or stopping.
2. To turn off the engine, remove the ignition key.

Care and maintenance

Note: Turn off the engine, remove the ignition key and remove the spark plug cable from the spark plug before servicing, cleaning or maintenance.

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Parts

1. Feed screw pulley
2. Tensioner bolt
3. Drive belt
4. Tensioner
5. Wire guide
6. Tensioner wheel

7. Engine pulley

8. Make sure that there are no foreign objects around the muffler.

9. Inspect regularly to make sure that all bolts, nuts and screws are tight and that there is no visible damage.
10. Regularly check the fuel system for any visible signs of leakage at the tank, fuel cap or fuel lines.
11. Never attempt to tamper with or modify the product in any way.

Lubrication

• Lubricate the points where the clutch lever attaches to the handle before every season.
• Lubricate the wire guides and the tensioner bolt before and after every season. Use a few drops of engine oil and/or spray lubricant (e.g. 5–56, WD 40). Do not over-lubricate!

Note: Make sure that no lubricant comes in contact with the drive belt.

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Changing oil

Note: Engine oil becomes hot after use. Let the engine cool off a bit before changing the oil.

1. Place an appropriate container under the drain plug (10).
2. Remove the drain screw and empty the oil.
3. Replace the screw and fill with oil. See the Oil level checks and refills section described above.

Spark plug

Note: Let the engine cool before unscrewing and removing the spark plug. Both the spark plug and muffler become very hot after use. Check the spark plug before every season. Change when necessary.

1. Remove the spark plug cable from the spark plug. Do not pull the cable but rather grip the spark plug cap and wiggle it back and forth to loosen it.

2. Use a spark plug spanner to remove it from its socket.

3. Check the electrodes for any visible damage and clean with a steel brush when necessary.

4. Check that the electrode gap is between 0.6–0.8 mm. Special tools for gapping are available for purchase separately.

5. Try to screw the spark plug partway in by hand to make sure the threads catch correctly. Tighten using a spark plug spanner.

6. Washers on the new spark plug must be compressed during installation. Tighten a 12 turn extra after the spark plug is securely in place to compress the washer and create a proper seal.

7. Turn a 14 turn extra if you are using the existing spark plug.

Handy hint: Thread a small piece of PVC hose to the spark plug tip to make it easier to insert and thread into the socket.

Clutch lever wire adjustment

The wire becomes slack after some usage and it may be necessary to adjust it from time to time.

1. Unscrew the wire bracket from the handle as previously described under the Installation section.
2. Move the wire to the upper hole.
3. Screw the wire bracket back on.
4. Start the snow blower and check for proper operation.
5. If the clutch lever still doesn't work satisfactorily the drive belt should be changed.

Changing the Drive Belt

Disassembly

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1. Remove the protective cover by removing the 4 retaining screws.

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1. Grab the belt in front of the feed screw's pulley and remove it from the pulley.

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1. Press the tensioner wheel down to release the belt from the belt tension tab which presses against the feed screw's pulley.

Reinstallation

1. Press the tensioner wheel down to allow the belt enough room under the belt tension tab to be reinstalled.
2. Release the tensioner wheel and re-install the belt in reverse order. Finish by threading the belt to the bottom of the feed screw pulley.
3. Adjust the wire by attaching it to the clutch lever's bottom hole and check for proper functioning.
4. Move the wire to the upper hole if necessary.
5. Replace the protective cover.

Shave blade changing or adjustment

If the wheels, shave blade and feed screw do not contact the surface at the same time, the shave blade should be adjusted and/or the rubber blades need to be changed.

• Place the snow blower on a level surface. The wheels, shave blade and the feed screw should all make contact with the surface at the same time.
• If the shave blade is too high, snow will be discharged out the back, under the blower.
• If the shave blade is too low, it will wear out prematurely and forward propulsion will be adversely affected.

Adjustment

1. Empty the fuel tank when the engine is cold. Do the work outside and collect the fuel in an appropriate container. If the fuel is not to be reused, deposit it at the most appropriate recycling centre.

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Diagram of a vehicle chassis with wheels and a motor, showing four upward arrows indicating motion or force direction (no text or symbols present)

1. Loosen the 4 screws and adjust the shave blade to the desired position.

2. Tilt the blower forward so that the wheels are off the ground and the blower rests on its chassis.

3. Re-tighten the screws securely.

Note: If the blower is tipped back so that the handle touches the ground, there is a risk that engine oil will leak into the engine's combustion chamber and cause starting problems. If this should occur, remove the spark plug and clean it thoroughly. Pull the starter handle several times with the spark plug removed in order to remove any excess oil. Please remember to check the oil level again and add oil if needed. Replace the spark plug and start the engine, which will initially produce smoke in the exhaust. This is completely normal.

Replacement

1. Empty the fuel tank when the engine is cold. Do the work outside and collect the fuel in an appropriate container. If the fuel is not to be reused, deposit it at the most appropriate recycling centre.
2. Tilt the blower forward so that the wheels are off the ground and the blower rests on its chassis.
3. Loosen the 4 screws and remove the shave blade.
4. Install the new shave blade so that the wheels, shave blade and the feed screw make contact with an even level surface at the same time.
5. Retighten the screws securely.

Changing the rubber feed screw blade

1. Loosen the 4 retaining screws and feed screw.
2. Replace with a new blade and tighten the retaining bolts securely.

Mechanical assembly diagram showing a motor or gear mechanism with no visible text or symbols

Engine service intervals

Follow the hourly or seasonal schedule depending on which occurs first.

	After the first 5 hours.	At every use or after every 5 hours.	At every use or after every 25 hours.	At every use or after every 50 hours.
Check the oil level. •
Change oil. • •
Check spark plug. •
Clear area around muffler. •

Long-term storage procedures (over a month)

• Empty the fuel tank when the engine is cold. Do the work outside and collect the fuel in an appropriate container. If the fuel is not to be reused, deposit it at the most appropriate recycling centre.
• Start the engine and let it run until it is out of fuel.
• Store the snow blower in a well ventilated area where there are no open flames, sparks or other heat sources present in close vicinity.

Disposal

When it is time to dispose of this product, do so in accordance with local regulations. If you are unsure how to proceed, contact your local authority.

Specifications

Type One-stage

Clearing capacity 530 mm

Max snow depth approximately 250 mm

Discharge range approximately 6 m

Engine 123 cc, 4 HP

Fuel tank capacity 21

Chute 180° swivel

Discharge angle 70° adjustable

Pneumatic rubber tyres, diam 190 mm

Sound pressure level 86 dB(A), uncertainty K=1.5 dB(A)

Sound power level 97 dB(A), uncertainty K=1.5 dB(A)

Vibration value 15.0 m/s ^2 , uncertainty K=1.5 m/s ^2

Weight 40 kg

Troubleshooting guide

Problem Possible	cause Solution
The engine does not start.	No fuel or the fuel is too old.Clogged fuel line.Ignition key not fully inserted.Spark plug cable not properly connected.Defective spark plug.Engine not adequately primed.Engine is flooded (over-priming).	Empty the tank and refill with new fuel.Clean or replace the fuel lines.Insert the key completely.Securely attach the spark plug wire.Clean the plug and check the electrode gap or change plugs.Press the primer about 3–5 times.Wait at least 10 min. before a restart attempt.
The engine runs irregularly.	The engine runs on choke even when warm.Blocked fuel lines or old petrol.Sediment and/or water in the fuel system.The carburettor is maladjusted.	Reset the choke back into place.Clean or replace the fuel lines. Empty the tank and refill with new fuel.Empty the tank and carburettor and refill with new fuel.Contact an authorised service centre.
The engine is underpowered.	Spark plug cable loose.Fuel cap's vents blocked.	Fasten the spark plug cable securely to the plugClean the fuel cap and make sure ventilation holes are free.
The engine is overheated.	The carburettor is maladjusted. Contact an authorised service centre.
Abnormal vibrations occur.	Loose parts or damaged feed screw. Turn off the engine and disconnect the spark plug wire. Tighten all bolts. Check the feed screw and replace any damaged parts.
The blower doesn't move forward.	The wire and/or shave blade is maladjusted.The drive belt is loose or damaged.	Adjust the wire and/or shave blade.Install the drive belt correctly or replace it if it is damaged.
The feed screw continues to rotate despite being disengaged.	The wire is maladjusted. Adjust the wire by moving it to the bottom hole of the clutch lever.
No snow exits the chute.	The chute is clogged.Foreign object/s are preventing the feed screw from rotating.The wire is maladjusted or the drive belt needs changing.	Turn off the engine and disconnect the spark plug wire. Clean out the chute and the area around the feed screw with an appropriate object (e.g. a wooden stick or similar).Clean out the area around the feed screw with an appropriate object (e.g. a wooden stick or similar)Adjust the wire by moving it to the top hole of the clutch lever.

Enstegs snöslunga 4 hk

ART.NR 31-4818 MODELL DB7404

Two views of a lawn mower with mechanical components and circular annotations indicating rotation or repair steps (no text or symbols present)

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Fyll på bränsle

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Delar

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Oljebyte

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Motorns serviceintervall

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1. Kontroller at metallsperren på utkastet sitter i festet sitt.

2. Hold utkastet på plass og monter låsekragen.

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1. Fest kragen med snepplåsen.

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Deler

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Oljeskift

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Motorens serviceintervaller

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Polttoaineen lisäys

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Osat

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Öljynvaihto

Mechanical component diagram showing a wheel and belt mechanism (no text or symbols)

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Declaration of Conformity

Machinery directive 2006/42/EC

EMC directive 2004/108/EC

Low voltage directive 2006/95/EC

ISO/DIS 8437:2008 EN

SO 14982:2009 EN 603

35-1:2002

+A11:2004+A1:2004

+A12:2006+A2:2006

+A13:2008+A14:2010

Klas Balkow President

Insjön, Sweden, 2012-10-03

CO TECH®

SVERIGE

KUNDTJÄNST Tel: [phone]

Fax: [phone]

E-post: [e-mail]

INTERNET www.clasohlson.se

BREV Clas Ohlson AB, 793 85 INSJÖN

NORGE

KUNDESENTER Tlf.: 23 21 40 00

Faks: 23 21 40 80

E-post: [e-mail]

INTERNETT www.clasohlson.no

POST

Clas Ohlson AS, Postboks 485 Sentrum, 0105 OSLO

SUOMI

ASIAKASPALVELU Puh.: 020 111 2222

For consumer contact, please visit www.clasohlson.co.uk and click on customer service.

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