Toro 74143 Operator's Manual page 57

Problem
Machine does not drive.
Abnormal vibration.
Uneven cutting height.
Blades do not rotate.
Clutch will not engage.
Possible Cause
1. By pass valves is not closed tight.
2. Pump belt is worn, loose or broken.
3. Pump belt is off a pulley.
4. Broken or missing idler spring.
5. Hydraulic oil level is low or too hot.
1. Cutting blade(s) is/are bent or
unbalanced.
2. Blade mounting bolt is loose.
3. Engine mounting bolts are loose.
4. Loose engine pulley, idler pulley, or
blade pulley.
5. Engine pulley is damaged.
6. Blade spindle is bent.
7. Motor mount is loose or worn.
1. Blade(s) not sharp.
2. Cutting blade(s) is/are bent.
3. Mower deck is not level.
4. Underside of mower is dirty.
5. Tire pressure is not correct.
6. Blade spindle bent.
1. Mower deck belt is worn, loose or
broken.
2. Mower deck belt is off pulley.
3. Pump drive belt is worn, loose or
broken.
4. Broken or missing idler spring.
1. Fuse is blown.
2. Low voltage supply at the clutch.
3. Damaged coil.
4. Inadequate current supply.
5. Rotor/armature airgap is too large.
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Corrective Action
1. Tighten the by pass valves.
2. Change the belt.
3. Change the belt.
4. Replace the spring.
5. Add hydraulic oil to 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 new cutting blade(s).
3. Level mower deck from side-to-side
and front-to-rear.
4. Clean the underside of the mower.
5. Adjust the tire pressure.
6. Contact an Authorized Service Dealer.
1. Install new deck belt.
2. Install mower deck pulley and check
the idler pulley, idler arm and spring for
correct position and function.
3. Check the belt tension or install new
belt.
4. Replace the spring.
1. Replace fuse. Check coil resistance,
battery charge, charging system, and
wiring connections and replace if
necessary.
2. Check coil resistance, battery
charge, charging system, and wiring
connections and replace if necessary.
3. Replace clutch.
4. Repair or replace clutch lead wire or
electrical system. Clean connector
contacts.
5. Remove shim or replace clutch.