Toro 70089 Operator's Manual page 48

Troubleshooting
PROBLEM
Blade does not rotate
Engine loses power. g
Engine overheats. g
Abnormal vibration.
46
POSSIBLE CAUSES
1. Blade drive belt is worn, loose
or broken.
2. Blade drive belt is off pulley.
1. Engine load is excessive.
2. Air cleaner is dirty.
3. Oil level in crankcase is low.
4. Cooling fins and air passages
under engine blower housing
are plugged.
5. Spark plug is pitted, fouled, or
gap is incorrect.
6. Vent hole in fuel cap is
plugged.
7. Carburetor is adjusted
incorrectly.
8. Dirt, water, or stale fuel is in
fuel system.
1. Engine load is excessive.
2. Oil level in crankcase is low.
3. Cooling fins and air passages
under engine blower housing
are plugged.
4. Carburetor is adjusted
incorrectly.
1. Engine mounting bolts are
loose.
2. Loose engine pulley, idler
pulley, or blade pulley.
3. Engine pulley is damaged.
4. Cutter blade is unbalanced,
bent, or loose.
5. Blade bolt is loose.
6. Drive belt is damaged.
CORRECTIVE ACTION
1. Install new blade drive belt.
2. Install blade drive belt and
check idler pulley and belt
guides for correct position.
1. Reduce ground speed.
2. Clean air cleaner element.
3. Add oil to crankcase.
4. Remove obstruction from
cooling fins and air passages.
5. Install new, correctly gapped
spark plug.
6. Clean or replace the fuel cap.
7. Adjust the carburetor.
8. Contact Authorized Service
Dealer.
1. Reduce ground speed.
2. Add oil to crankcase.
3. Remove obstruction from
cooling fins and air passages.
4. Adjust the carburetor.
1. Tighten engine mounting
bolts.
2. Tighten the appropriate
pulley.
3. Contact Authorized Service
Dealer.
4. Install new cutter blade.
5. Tighten bolt to 45–60 ft-lb
(61–81 N-m).
6. Install blade drive belt and
check idler pulley and belt
guides for correct position.