Husqvarna SG11 Operator's Manual page 40

Problem
Belt coming off.
Belt engages late
or slips.
Belt not staying tight
after adjustment.
The cutting wheel
does not rotate.
The cutting wheel continues
to rotate.
The parking brake is slipping.
38 – English
TROUBLESHOOTING
Possible solutions
1. Pulleys not aligned.
2. Belt tension is insufficient. Adjust belt tension.
1. Tighten the belt as described in the operator's manual.
2. Reduce cutting depth.
1. Check for damage on the axle, pulley or key. Make sure
that the setscrews are properly tightened.
2. Replace damaged parts.
1. Engine speed is insufficient to activate the centrifugal clutch. Make
sure the throttle cable is working properly.
2. Belt tension is insufficient. Adjust belt tension.
1. Check that the throttle is disconnected.
2. Check for damage on the throttle cable.
3. Check that the throttle cable is properly mounted on the throttle valve.
4. The engine speed is not under 1000, which is required
to disengage the centrifugal clutch.
5. The centrifugal clutch is damaged and is not disengaging properly.
Replace the clutch.
1. Adjust the brake tension in the manner described in the
operator's manual.
2. Check for damage on the brake cable or lever.
3. Check for wear on the brake pads. Replace as necessary.