Cotech DB7404 - Troubleshooting Guide

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Troubleshooting guide
Problem Possible cause Solution
The engine
doesnot start.
1. No fuel or thefuel is too old.
2. Clogged fuel line.
3. Ignition key not fully inserted.
4. Spark plug cable not properly
connected.
5. Defective spark plug.
6. Engine not adequately primed.
7. Engine is flooded (over-priming).
1. Empty thetank and refill with new fuel.
2. Clean or replace thefuel lines.
3. Insert thekey completely.
4. Securely attach thespark plug wire.
5. Clean theplug and check theelectrode gap
or change plugs.
6. Press theprimer about 3–5 times.
7. Wait at least 10 min. before arestart attempt.
The engine
runsirregularly.
1. The engine runs on choke even
when warm.
2. Blocked fuel lines or old petrol.
3. Sediment and/or water in
thefuelsystem.
4. The carburettor is maladjusted.
1. Reset thechoke back into place.
2. Clean or replace thefuel lines. Emptythetank
and refill with new fuel.
3. Empty thetank and carburettor and refill with
new fuel.
4. Contact anauthorised service centre.
The engine is
underpowered.
1. Spark plug cable loose.
2. Fuel cap’s vents blocked.
1. Fasten thespark plug cable securely to theplug.
2. Clean 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.
1. The wire and/or shave blade
ismaladjusted.
2. The drive belt is loose or damaged.
1. Adjust thewire and/or shave blade.
2. 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.
1. The chute is clogged.
2. Foreign object/s are preventing
thefeed screw from rotating.
3. The wire is maladjusted or
thedrive belt needs changing.
1. 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).
2. Clean out thearea around thefeed screw
with anappropriate object (e.g. awooden
stick or similar)
3. Adjust thewire by moving it to thetop hole of
theclutch lever.