Check exhaust pipe for damage (cross section reduced)
| Possible defect | Remedy |
|---|---|
| Mechanical damage | Install new exhaust pipe |
| Partially blocked | Clean exhaust pipe |
Check delivery quantity of fuel pump
| Possible defect | Remedy |
|---|---|
| Excessive fuel | Correctly adjust delivery quantity |
Check combustion air intake for free passage (visual check).
| Possible defect | Remedy |
|---|---|
| Intake blocked | Clean combustion air intake |
Check combustion air blower motor speed.
| Possible defect | Remedy |
|---|---|
| Battery voltage too low | Charge battery |
| Blower fan loose (chafes) | Remove combustion air blower, secure blower fan (note air gap of .039/1 mm) and install new blower fan if necessary “ |
| Speed is not attained at nominal voltage (6400-7100 rpm) | Remove motor and check, install new one if necessary |