Exmark LAZER Z CT Operator's Manual page 39

Problem
Engine overheats
Mower pulls left or right (with levers fully
forward)
Machine does not drive
Uneven cutting height.
Abnormal vibration
Blades do not rotate.
Possible Cause
1. Engine load is excessive
2. Oil level in the crankcase is low.
3. Cooling fins and air passages for the
engine are plugged.
1. Tracking needs adjustment
2. Tire pressure in drive tires not correct.
3. Reverse indicator and motion control
linkage need adjustment.
1. Bypass valve is not closed tight.
2. Drive or pump belt is worn, loose or
broken.
3. Drive or pump belt is off a pulley.
4. Broken or missing idler spring.
5. Hydraulic fluid level is low or too hot.
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 in drive tires not correct.
6. Blade spindle bent.
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.
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.
1. Drive belt is worn, loose or broken.
2. Drive belt is off pulley.
3. Deck belt is worn, loose or broken.
4. Deck belt is off pulley.
5. Broken or missing idler spring.
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Troubleshooting
Corrective Action
1. Reduce the ground speed.
2. Add oil to the crankcase.
3. Remove the obstructions from the cooling
fins and air passages.
1. Adjust the tracking.
2. Adjust tire pressure in the drive tires.
3. Adjust the reverse indicator and the
motion control linkage.
1. Tighten the bypass valve.
2. Change the belt.
3. Change the belt.
4. Replace the spring.
5. Add hydraulic fluid to reservoir or let it
cool down.
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 tire pressure in the drive tires.
6. Contact an Authorized Service Dealer.
7. Replace blades, spindles and (or) check
for damage to mower deck.
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.
1. Check the belt tension.
2. Install drive belt and check adjusting
shafts and belt guides for correct position.
3. Install new deck belt.
4. Install deck pulley and check the idler
pulley, idler arm and spring for correct
position and function.
5. Replace the spring.