Husqvarna TC449 Workshop Manual page 27

Noise seems to come
from secondary drive
chain
Clutch slips
Clutch is hard to operate
Gears do not engage
Gear shift pedal
does not return to original position 1. Weak or broken selector return spring
Transmission jumps out of gear 1. Worn sliding gear dogs
Engine has low power
Engine overheats
1 edition (08-2010) _Rev. 11-2010
st
TROUBLESHOOTING
Noise seems to come from gearbox
1. Worn gears
2. Worn gear grooves
1. Chain stretched (worn) or improperly adjusted
2. Worn transmission sprocket and rear chain sprocket
1. Weak clutch springs
2. Worn clutch plates
3. Loosened clutch idler gear nut
1. Uneven spring load
2. Bent clutch plates
1. Bent or seized shifter forks
2. Worn gear ratchets
3. Damaged shifter fork shafts
2. Worn shifter forks
2. Worn gear grooves
3. Worn dog slots in gears
4. Worn selector shaft splines
5. Damaged shifter fork shafts
1. Dirty air filter
2. Poor fuel quality
3. Intake coupling loose
4. Spark plug electrode gap too wide
5. Insufficient compression
6. Incorrect valve clearances
7. Valve seats or guides faulty
8. Weak or seized valve springs
1. Combustion chamber and/or piston crown fouled
with carbon deposits
2. Insufficient oil in engine or
wrong oil
3. Obstructions blocking air flow on radiator
4. Cylinder head gasket leaking
5. Clutch slips
6. Cooling fan faulty (TE-TXC-SMR)
7. Low coolant level
C.3
Replace
Replace
Replace or adjust
Replace
Replace
Replace
Tighten nut
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Clean
Replace
Tighten
Adjust
Identify cause
Adjust
Replace
Replace
Clean
Top up or change
Clean
Replace
Adjust
Replace thermal switch
Top up to correct level