Husqvarna T435 - Page 55

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Trouble shooting
Acceleration and retardation
Does not
accelerate
The engine
stops when
releasing the
throttle
Too rich
acceleration
Adjust the L-screw
Adjust the H-screw
Blocked air fi lter
Tank venting clogged
The fuel fi lter is clogged
The fuel hose 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 binding
Faulty diffuser jet
Clogged muffl er
Adjust the L-screw
Adjust the H-screw
Faulty pump diaphragm
Control system set too high
Control system is binding
Faulty diffuser jet
Adjust the L-screw
Adjust the H-screw
Blocked air fi lter
Faulty pump diaphragm
Faulty diffuser jet
8.2 Trouble shooting techniques
In addition to faults given in the above schematic,
trouble shooting can be carried out on a specifi c
component or specifi c chain saw system.
The different procedures are described in
respective sections, see the list of contents, 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
Does not run
at full throttle
Low on
power
Will not “four
stroke”
Adjust the H-screw
Blocked air fi lter
Tank venting clogged
The fuel fi lter is clogged
The fuel hose 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 membrane/cover
plate
Control system is binding
Clogged muffl er
Adjust the H-screw
Tank venting clogged
The fuel fi lter is clogged
Impulse channel leaking
Blocked impulse channel
The cover on the carburettor
pump side is loose
Faulty pump diaphragm
Blocked air fi lter
Control system is binding
Leaking control system (air or fuel)
Control system incorrectly
assembled
Loose diaphragm rivet
Hole in the membrane
Leak in control membrane/cover
plate
Tank venting clogged
The fuel fi lter is clogged
The fuel hose 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 membrane/cover
plate