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 |
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 | |
|
| |
The engine | Faulty pump diaphragm |
|
stops when | Control system set too high | |
releasing the | Control system sticking | |
throttle | Faulty diffuser jet | |
|
| |
| 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
