Forest Master Model: FM6DD/FM4DDE
18
Symptom
Possible Cause
The engine lacks
power or is not
running smoothly
(Petrol).
• Check that the throttle lever is in the “RUN” position.
• Is the air filter clean? If it’s dirty change it following the
procedure in the engine manufacturer’s manual.
• Is the spark plug clean? If it’s dirty or cracked, change it.
If it’s oily, leave it out, hold a rag over the plug hole and
pull your recoil cord several times to blow out any oil in
the cylinder, then wipe off the plug and reinsert it.
• Are you using fresh, clean unleaded fuel? If it’s old,
change it. Use a fuel stabilizer if you keep gas longer
than 30 days.
• Does your engine have the right amount of clean oil? If
it’s dirty, change it following the procedure in the engine
manufacturer’s manual.
• Check the oil level and adjust if needed.
Engine smokes
(Petrol).
• Check the oil level and adjust as needed.
• Check the air filter and clean or replace if needed.
• You may be using the wrong oil – too light for the
temperature. Refer to your engine owner’s manual for
detailed information.
• Clean the cooling fins if they are dirty.
Insufficient draw-
ing through of
branches or bad
chipping perfor-
mance.
• Are the knives blunt or worn? Sharpen or replace if
needed
• Are the branches too thick? Maximum diameter is 50mm
• Is there too much or too little space between the knives
and the base plate? Adjust the bolts on the knifes to fit
and manual rotate the drum to check if it turns smoothly.
Motor cuts out or
does not start.
• Is the motor too hot or overheating? Wait 10 minutes for
the motor to cool down and try again.
• Is there a blockage in the drum? Inspect the drum and
remove any potential blockages.
• Does the motor need to be reset? Press the reset button
on the motor (next to the on off switches).
Troubleshooting
