Husqvarna 340 User Manual Page 11
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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10 – English
Troubleshooting
Worn needle valve
Leaking control diaphragm/
cover plate
Needle valve assembly sticking
Worn needle valve lever
Faulty diffuser jet
Fuel filter blocked
Fuel line blocked
Leaking air intake hose (rubber)
Loose carburettor mounting
bolts
Worn throttle valve pivot
Loose throttle valve screw
Worn throttle valve
Needle valve assembly
sticking
Leak in metering system (air
or fuel)
Metering system centre knob
is worn
Hole in diaphragm
Leaking control diaphragm/
cover plate
Crankcase leaking
Fuel line blocked
Needle valve set too high
Needle valve assembly sticking
Leak in metering system (air
or fuel)
Leaking control diaphragm/
cover plate
Faulty diffuser jets
Crankcase leaking
Needle valve set too high
Needle valve assembly sticking
Metering system damaged
Worn needle valve
Leaking control diaphragm/
cover plate
Metering system incorrectly
assembled
Adjust L screw
Air filter blocked
Choke not working
Worn choke pivot
Worn choke valve
Fuel filter blocked
Fuel line blocked
Piston ring seized
Blocked impulse channel
Loose or faulty fuel pipe
Hole in diaphragm
Worn needle valve
Needle valve assembly sticking
Needle valve set too high
Leak in metering system (air
or fuel)
Loose cover on carburettor
pump side
Worn needle valve
Needle valve set too high
Needle valve assembly sticking
Difficulty starting
Carburettor
leaking fuel
Flooding when
engine not
running
Starting
The various faults that can affect a chainsaw are divided into four groups. In each group the likely symp-
toms are given on the left and possible causes are listed on the right. The most likely faults are given first,
and so on.
Idling (low rpm)
Idles when L
screw closed
Idling uneven
L screw requires
constant
adjustment
Too much fuel at
idling
Idling (low rpm) (cont.)
Adjust L screw
Leaking air intake hose
(rubber)
Loose carburettor mounting
bolts
Loose or faulty fuel hose
Fuel filter blocked
Fuel line blocked
Fuel tank vent blocked
Throttle valve pivot stiff
Throttle pushrod sticking
Defective throttle return spring
Bent throttle stop
Faulty diffuser jet
Adjust L screw
Worn needle valve
Needle valve set too high
Worn needle valve lever
Leaking control diaphragm/
cover plate
Needle valve assembly
sticking
Will not idle
Idling too rich
- 340 345 346XP 1
- 350 351 353 1
- Workshop manual 2
- Contents 2
- Introduction 3
- Safety regulations 4
- Special tools 5
- Technical data 7
- Construction and function 10
- Troubleshooting 11
- Troubleshooting methods 12
- Repair instructions 13
- Operating test: 14
- Chain brake – reassembly 14
- Cleaning and inspection 15
- Silencer – refitting 15
- Chain catcher – replacement 15
- Silencer – removal 15
- Stop switch – removal 16
- Choke control – removal 17
- Stop switch – refitting 17
- 351G, 353G – removal 19
- Starter assembly – removal 22
- Starter assembly – refitting 23
- Tensioning the recoil spring 23
- Ignition module – testing 24
- Generator – refitting 25
- 351, 353 25
- Min 65mm 27
- Oil pump –refitting 340, 345 30
- Carburettor – reassembly 33
- 346XPG, 351G, 353G 34
- Carburettor – refitting 34
- Refitting 35
- Air intake system – removal 36
- Air intake system – refitting 37
- Carburettor – adjustment 38
- Fuel tank – removal 39
- Replacing the fuel hose 40
- Replacing the fuel filter 40
- Tank vent – testing 41
- Fuel tank – refitting 41
- Piston and cylinder – removal 42
- Cylinder – pressure testing 45
- Crankcase and crankshaft – 46
- Repairing damaged threads 50
- Thread insert 50
- Guide bar bolts – replacement 50
- Appendix A 51
- 114 01 47-26 52
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