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58 - English
Troubleshooting
Acceleration and retardation
Does not
accelerate
The engine
stops when
releasing the
throttle
Blocked air lter
Tank venting clogged
Blocked fuel lter
Blocked fuel line
Loose or faulty fuel pipe
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Leaking inlet hose (rubber)
Loose carburettor mounting
Control system set too low
Control system incorrectly
assembled
Control system sticking
Faulty diffuser jet
Blocked mufer
Faulty pump diaphragm
Control system set too high
Control system sticking
Faulty diffuser jet
Blocked air lter
Faulty pump diaphragm
Faulty diffuser jet
8.2 Troubleshooting methods
In addition to faults given in the above schematic,
troubleshooting can be carried out on a specic
component or specic chain saw system. The
different procedures are described in respective
sections and are as follows:
• Function check of chain brake
• Resistance testing the stop plate
• Pressure testing the carburettor
• Pressure testing the decompression valve
• Pressure testing the cylinder
High speed
Will not run
at full throttle
Low power
Will not “four
stroke”
Blocked air lter
Tank venting clogged
Blocked fuel lter
Blocked fuel line
Loose or faulty fuel pipe
Impulse channel leaking
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Leaking inlet hose (rubber)
Loose carburettor mounting
Control system set too low
Damaged control system
Control system incorrectly
assembled
Leaking diaphragm/cover plate
Control system sticking
Blocked mufer
Tank venting clogged
Blocked fuel lter
Impulse channel leaking
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Blocked air lter
Control system sticking
Leaking control system (air or
fuel)
Control system incorrectly
assembled
Loose diaphragm
Hole in diaphragm
Leaking diaphragm/cover plate
Tank venting clogged
Blocked fuel lter
Blocked fuel line
Loose or faulty fuel pipe
Impulse channel leaking
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Leaking inlet hose (rubber)
Loose carburettor mounting
Control system set too low
Leaking control system
(air or fuel)
Control system incorrectly
assembled
Loose diaphragm
Hole in diaphragm
Leaking diaphragm/cover plate