Forest-Master FM4DDE - The engine lacks power or is not running smoothly (Petrol); Insufficient drawing through of branches or bad chipping performance.; Motor cuts out or does not start.

Forest Master Model: FM6DD/FM4DDE18
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 lter 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 o 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 lter 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 ns if they are dirty.
Insucient 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 t
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 o switches).
Troubleshooting