Husqvarna TE 630 2011 I.E. Manual page 76

The engine knocks
- excessive carbon deposit on the piston crown, or in the
combustion chamber: clean
- faulty spark plug or wrong heat rating: replace
The alternator fails to charge, or its charge is insufficient
- the cables on the voltage regulator are badly connect-
ed, or in short-circuit: correctly connect, or replace
- faulty alternator coil: replace
- de-magnetised alternator rotor: replace
- faulty voltage regulator: replace
The battery overheats
- faulty voltage regulator: replace
Difficulty in shifting gears
- engine oil with too high viscosity rating: replace with
the recommended oil
The clutch slips
- insufficient spring load: replace
- worn-out clutch plates: replace
Faulty brakes
- worn-out pads: replace
EN - 18