Husqvarna T540 XP - Page 65

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Troubleshooting
Too rich
acceleration
Acceleration and retardation
Does not
accelerate
The engine
stops when
releasing the
throttle
Blocked air lter
Tank venting clogged
The fuel lter is clogged
The fuel line is clogged
Loose or defective fuel hose
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Leaking inlet hose (rubber)
Loose clamping screws
carburettor
Control system set too low
Control system incorrectly
assembled
Control system is jamming
Faulty diffuser jet
Blocked mufer
Faulty pump diaphragm
Control system set too high
Control system is jamming
Faulty diffuser jet
Blocked air lter
Faulty pump diaphragm
Faulty diffuser jet
8.2 Troubleshooting techniques
In addition to faults given in the above schematic,
troubleshooting can be carried out on a specic
component or specic chain saw system. The
different procedures are described in respective
sections, see the list of contents, and are as follows:
• Resistance testing the stop plate
• Pressure testing the carburettor
• Pressure testing the decompression valve
• Pressure testing the cylinder
High speed
Does not run
at full throttle
Low on
power
Too lean
Blocked air lter
Tank venting clogged
The fuel lter is clogged
The fuel line is clogged
Loose or defective fuel hose
Impulse channel leaking
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Leaking inlet hose (rubber)
Loose clamping screws
carburettor
Control system set too low
Control system damaged
Control system incorrectly
assembled
Leak in control diaphragm/
cover plate
Control system is jamming
Blocked mufer
Tank venting clogged
The fuel lter is clogged
Impulse channel leaking
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Blocked air lter
Control system is jamming
Leaking control system (air or fuel)
Control system incorrectly
assembled
Loose diaphragm rivet
Hole in the membrane
Leak in control diaphragm/
cover plate
Tank venting clogged
The fuel lter is clogged
The fuel line is clogged
Loose or defective fuel hose
Impulse channel leaking
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Leaking inlet hose (rubber)
Loose clamping screws
carburettor
Control system set too low
Leaking control system (air or fuel)
Control system incorrectly
assembled
Loose diaphragm rivet
Hole in the membrane
Leak in control diaphragm/
cover plate