Troubleshooting
8.1 Troubleshooting
The different faults which may occur on the chain saw are divided into four groups. Within each group possible operating faults are listed to the left while the probable fault alternatives are listed to the right. The most likely fault is listed first, etc. See separate instruction for Autotune troubleshooting.
Starting
Difficult to start | Air filter blocked |
| Choke does not work |
| Worn choke axle |
| Worn choke valve |
| Blocked fuel filter |
| Blocked fuel line |
| Piston ring is stuck |
| Blocked impulse channel |
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The carburettor | Loose or faulty fuel pipe |
leaks fuel | Hole in diaphragm |
| Worn needle/needle tip |
| Control system sticking |
| Control system set too high |
| Leaking control system |
| (air or fuel) |
| The cover on the carburettor |
| pump side is loose |
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Floods when the | Worn needle/needle tip |
engine is not | Control system set too high |
running | Control system sticking |
Idling (low speed) |
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Does not idle | Leaking inlet hose (rubber) |
| Loose carburettor mounting |
| Loose or faulty fuel pipe |
| Blocked fuel filter |
| Blocked fuel line |
| Tank ventilator blocked |
| The throttle valve shaft is inert |
| Throttle stay is binding |
| Defective throttle return spring |
| Bent valve axle stop |
| Faulty diffuser jet |
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Too rich idling | Worn needle/needle tip |
| Worn lever arm in the control |
| system |
| Leaking diaphragm/cover plate |
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Idling (low speed) (continued)
| Worn needle/needle tip |
| Leaking diaphragm/cover plate |
| Worn lever arm in the control |
| system |
| Faulty diffuser jet |
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Uneven idling | Blocked fuel filter |
| Blocked fuel line |
| Leaking inlet hose (rubber) |
| Loose carburettor mounting |
| Worn throttle valve axle |
| Loose throttle valve screw |
| Worn throttle valve |
| Leaking control system |
| (air or fuel) |
| The control system’s centre |
| knob is worn |
| Hole in diaphragm |
| Leaking diaphragm/ |
| cover plate |
| Leaking crankcase |
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| Blocked fuel line |
| Leaking control system |
| (air or fuel) |
| Leaking diaphragm/cover plate |
| Faulty diffuser jet |
| Leaking crankcase |
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Too much fuel at | Worn needle/needle tip |
idle speed | Leaking diaphragm/ |
| cover plate |
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