Husqvarna TrioBrake 550XPG Workshop Manual page 72

Troubleshooting
High speed
Will not run Blocked air filter
at full throttle Tank venting clogged
Blocked fuel filter
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 muffler
Low power Tank venting clogged
Blocked fuel filter
Impulse channel leaking
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Blocked air filter
Control system sticking
Leaking control system (air or
fuel)
Control system incorrectly
assembled
Loose diaphragm
Hole in diaphragm
Leaking diaphragm/cover plate
Will not "four Tank venting clogged
stroke" Blocked fuel filter
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
72
- English
Acceleration and retardation
Does not Blocked air filter
accelerate Tank venting clogged
Blocked fuel filter
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 muffler
Faulty pump diaphragm
The engine
Control system set too high
stops when
Control system sticking
releasing the
Faulty diffuser jet
throttle
Blocked air filter
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 specific
component or specific 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