Toro 170-DH Operator's Manual page 40

Problem
The engine loses power. g
There is abnormal vibration.
The blades do not rotate.
The cutting height is uneven. g g
Possible Causes
1. The engine load is excessive.
2. The air cleaner is dirty.
3. The oil level in the crankcase is
low.
4. The cooling fins and air
passages under the engine
blower housing are plugged.
5. The spark plug is pitted, fouled,
or the gap is incorrect.
6. The vent hole in the fuel cap is
plugged.
7. There is dirt in the fuel filter.
8. Dirt, water, or stale fuel is in the
fuel system.
1. The blades are bent or
unbalanced.
2. The blade mounting screws are
loose.
3. The engine mounting bolts are
loose.
4. There is a loose engine pulley,
idler pulley, or blade pulley.
5. The engine pulley is damaged.
6. The blade drive belt is
damaged.
1. The blade drive belt is worn,
loose, or broken.
2. The blade drive belt is off the
pulley.
3. The grass collector is not in
place.
1. The tire pressure is incorrect.
2. The mower is not level.
3. The underside of the mower is
dirty.
4. The blade mounting screws are
loose.
5. The blade drive belt tension is
incorrect.
40
Corrective Action
1. Reduce your ground speed.
2. Clean the air cleaner element.
3. Add oil to the crankcase.
4. Remove the obstruction from
the cooling fins and air
passages.
5. Install a new, correctly-gapped
spark plug.
6. Clean or replace the fuel cap.
7. Replace the fuel filter.
8. Contact an Authorized Service
Dealer.
1. Install a new blades.
2. Tighten the blade mounting
screws.
3. Tighten the engine mounting
bolts.
4. Tighten the appropriate pulley.
5. Contact an Authorized Service
Dealer.
6. Install a new blade drive belt.
1. Install a new blade drive belt.
2. Install the blade drive belt and
adjust it for the correct tension.
3. Install the grass collector.
1. Set the tire pressure.
2. Adjust the height adjustment
cable rod assembly.
3. Clean the underside of the
mower.
4. Tighten the blade mounting
screws.
5. Adjust the blade drive belt.