Exmark Lazer Z D-Series 920 - Manual (Page 50)

Troubleshooting
Problem Possible Cause Corrective Action
1. Engine load is excessive. 1. Reduce the ground speed.
2. Oil level in the crankcase is low. 2. Add oil to the crankcase.
3. Dirty air filter. 3. Clean or replace the air cleaner element.
4. Coolant level is low. 4. Add coolant.
5. Debris on or around radiator. 5. Remove debris (see Clean the Radiator
section in Maintenance).
Engine overheats.
6. Water pump or alternator belt is worn,
loose, or broken.
6. Contact an Authorized Service Dealer.
1. Tracking needs adjustment. 1. Adjust the tracking.
2. Tire pressure in drive tires not correct. 2. Adjust tire pressure in the drive tires.
Mower pulls left or right (with levers fully
forward)
3. Reverse indicator and motion control
linkage need adjustment.
3. Adjust the reverse indicator and the
motion control linkage.
1. By pass valve is not closed tight. 1. Tighten the by pass valve.
2. Drive or pump belt is worn, loose or
broken.
2. Change the belt.
3. Drive or pump belt is off a pulley. 3. Change the belt.
4. Broken or missing idler spring. 4. Replace the spring.
Machine does not drive
5. Hydraulic fluid level is low or too hot. 5. Add hydraulic fluid to reservoir or let it
cool down.
1. Blade(s) not sharp. 1. Sharpen the blade(s).
2. Cutting blade(s) is/are bent. 2. Install new cutting blade(s).
3. Mower deck is not level. 3. Level mower deck from side-to-side and
front-to-rear.
4. Underside of mower is dirty. 4. Clean the underside of the mower.
5. Tire pressure in drive tires not correct. 5. Adjust tire pressure in the drive tires.
6. Blade spindle bent. 6. Contact an Authorized Service Dealer.
Uneven cutting height.
7. Tips of adjacent blades are at an uneven
cutting height. Blades tips should be even
within 3/16 inch which is approximately
one blade thickness.
7. Replace blades, spindles and (or) check
for damage to mower deck.
1. Cutting blade(s) is/are bent or unbalanced. 1. Install new cutting blade(s).
2. Blade mounting bolt is loose. 2. Tighten the blade mounting bolt.
3. Engine mounting bolts are loose. 3. Tighten the engine mounting bolts.
4. Loose engine pulley, idler pulley, or blade
pulley.
4. Tighten the appropriate pulley.
5. Engine pulley is damaged. 5. Contact an Authorized Service Dealer.
6. Blade spindle is bent. 6. Contact an Authorized Service Dealer.
Abnormal vibration
7. Belt is damaged. 7. Install new belt.
1. Drive belt is worn, loose or broken. 1. Check the belt tension.
2. Drive belt is off pulley. 2. Check belt for damage; replace if
necessary. Install drive belt and check belt
guide for correct position.
3. Deck belt is worn, loose or broken. 3. Install new deck belt.
4. Deck belt is off pulley. 4. Install deck pulley and check the idler
pulley, idler arm and spring for correct
position and function.
5. Broken or missing idler spring. 5. Replace the spring.
Blades do not rotate.
6. Clutch has disengaged. 6. Engine has overheated; determine cause
of overheat (see Engine overheats).
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