Exmark Lazer Z Operator's Manual page 67

Problem
Oil pressure light is on and engine RPM is low
Engine loses power
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 Control Unit has limited engine
RPMs, known as "limp" mode.
1. Engine load is excessive
2. Air cleaner is dirty.
3. Oil level in the crankcase is low.
4. Cooling fins and air passages for the
engine are plugged.
5. Dirt in fuel filter.
6. Dirt, water, or stale fuel is in the fuel
system.
7. Low oil pressure
8. High oil temperature
1. Tire pressure in drive tires not correct.
1. Drive release handle not in "operating"
position.
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.
7. Belt is damaged.
1. Deck belt is worn, loose or broken.
2. Deck belt is off pulley.
3. Broken or missing idler spring.
4. Drive belt not routed correctly.
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Troubleshooting
Corrective Action
1. Let engine cool and check oil level. If level
is above "add", contact an Authorized
Service Dealer.
1. Reduce the ground speed.
2. Clean or replace the air cleaner element.
3. Add oil to the crankcase.
4. Remove the obstructions from the
cooling fins and air passages.
5. Replace the fuel filter.
6. Contact an Authorized Service Dealer.
7. Check oil level. If level is above "add",
contact an Authorized Service Dealer.
8. Let engine cool and check oil level. If level
is above "add", contact an Authorized
Service Dealer.
1. Adjust tire pressure in the drive tires.
1. Position handle in "operating" position;
see Drive Wheel Release Valves section
in Operation.
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.
7. Install new belt.
1. Install new deck belt.
2. Install belt on clutch and deck pulleys,
idlers, and tensioning idler per routing
decal on deck.
3. Replace the spring.
4. Refer to belt routing decal on deck.