Toro 74943 Operator's Manual page 77

Problem
The engine loses power.
The engine overheats.
The machine pulls to the left or right (with
levers fully forward)
The machine does not drive.
The machine vibrates abnormally.
The cutting height is uneven.
Possible Cause
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 the air passages
above the engine are plugged.
5. The vent hole in the fuel cap is plugged.
6. There is dirt in the fuel filter.
7. There is dirt, water, or stale fuel in the
fuel system.
1. The engine load is excessive.
2. The oil level in the crankcase is low.
3. The cooling fins and air passages
under the engine-blower housing are
plugged.
4. The air cleaner is dirty.
5. Dirt, water, or stale fuel is in the fuel
system.
1. The tracking needs adjustment
2. The tire pressure in the drive tires is
not correct.
1. The bypass valves are not closed tight.
2. The pump belt is worn, loose, or
broken.
3. The pump belt is off a pulley.
4. The idler spring is broken or missing.
5. The hydraulic fluid level is low or too
hot.
1. The cutting blade(s) is/are bent or
unbalanced.
2. The blade mounting bolt is loose.
3. The engine mounting bolts are loose.
4. The engine pulley, idler pulley, or blade
pulley is loose.
5. The engine pulley is damaged.
6. The blade spindle is bent.
7. The motor mount is loose or worn.
1. The blade(s) is not sharp.
2. A cutting blade(s) is/are bent.
3. The mower is not level.
4. An anti-scalp roller (if applicable) is not
set correctly.
5. The underside of the mower deck is
dirty.
6. The tire pressure is incorrect.
7. A blade spindle is bent.
77
Corrective Action
1. Reduce the ground speed.
2. Clean the air-cleaner element.
3. Add oil to the crankcase.
4. Remove the obstruction from the
cooling fins and the air passages.
5. Clean or replace the fuel cap.
6. Replace the fuel filter.
7. Contact an Authorized Service Dealer.
1. Reduce the ground speed.
2. Add oil to the crankcase.
3. Remove the obstruction from the
cooling fins and air passages.
4. Clean or replace the air-cleaner
element.
5. Contact an Authorized Service Dealer
1. Adjust the tracking.
2. Adjust the tire pressure in the drive
tires.
1. Tighten the bypass valves.
2. Change the belt.
3. Change the belt.
4. Replace the spring.
5. Add hydraulic fluid to the reservoirs or
let it cool down.
1. Install new cutting blade(s).
2. Tighten the blade mounting bolt.
3. Tighten the engine mounting bolts.
4. Tighten the appropriate pulley.
5. Contact an Authorized Service Dealer.
6. Contact an Authorized Service Dealer.
7. Contact an Authorized Service Dealer.
1. Sharpen the blade(s).
2. Install a new cutting blade(s).
3. Level the mower from side-to-side and
front-to-rear.
4. Adjust the anti-scalp wheel height.
5. Clean the underside of the mower
deck.
6. Adjust the tire pressure.
7. Contact an Authorized Service Dealer.