Problem
Possible Cause
Corrective Action
1. The tracking needs adjustment.
1. Adjust the tracking.
2. The tire pressure in the drive tires is
not correct.
2. Adjust the tire pressure in the drive
tires.
The machine pulls left or right (with the
motion-control levers fully forward).
3. The reverse indicator and
motion-control linkage need
adjustment.
3. Adjust the reverse indicator and the
motion-control linkage.
1. The cutting blade(s) is/are bent or
unbalanced.
1. Install new cutting blade(s).
2. The blade mounting bolt is loose.
2. Tighten the blade mounting bolt.
3. The engine mounting bolts are loose.
3. Tighten the engine mounting bolts.
4. The engine pulley, idler pulley, or blade
pulley is loose.
4. Tighten the appropriate pulley.
5. The engine pulley is damaged.
5. Contact an Authorized Service Dealer.
6. The blade spindle is bent.
6. Contact an Authorized Service Dealer.
There is abnormal vibration.
7. The motor mount is loose or worn.
7. Contact an Authorized Service Dealer.
1. The blade(s) is/are not sharp.
1. Sharpen the blade(s).
2. The cutting blade(s) is/are bent.
2. Install new cutting blade(s).
3. The mower deck is not level.
3. Level the mower deck from side-to-side
and front-to-rear.
4. The underside of mower is dirty.
4. Clean the underside of the mower.
5. The tire pressure is not correct.
5. Adjust the tire pressure.
Mowing is resulting in uneven cutting
height.
6. The blade spindle bent.
6. Contact an Authorized Service Dealer.
1. The drive belt is worn, loose, or broken.
1. Check the belt tension.
2. The drive belt is off the pulley.
2. Check belt for damage; replace if
necessary. Install the drive belt and
check the belt guide for the correct
position.
3. The deck belt is worn, loose, or broken.
3. Install a new deck belt.
4. The deck belt is off the pulley.
4. Install the deck pulley, idler pulley, idler
arm, and spring for correct position
and function.
5. There is a broken or missing idler
spring.
5. Replace the idler spring.
6. The clutch has disengaged.
6. The engine has overheated; determine
the cause of overheating.
The blades do not rotate.
7. The wing decks are not fully lowered.
7. Lower the wing decks.
1. A fuse is blown.
1. Replace the fuse. Check the coil
resistance, battery charge, charging
system, and wire connections.
Replace if necessary.
2. There is low voltage supply at the
clutch.
2. Check the coil resistance, battery
charge, charging system, and wire
connections. Replace if necessary.
3. There is an inadequate current supply.
3. Repair or replace the clutch-lead
wire or electrical system. Clean the
connector contacts.
4. Engine has overheated.
4. The engine has overheated; determine
the cause of overheating.
The clutch does not engage.
5. The wing decks are not fully lowered.
5. Lower the wing decks.
1. The operator is not seated.
1. Sit on the seat.
2. The key is not in the R
UN
position.
2. Turn the key to R
UN
position.
The deck will not raise or lower.
3. The fluid level is low.
3. Check the fluid level.
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Summary of Contents for Air Cool Z Master 74090
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