Exmark STARIS S Series Operator's Manual page 48

Troubleshooting
Problem
Engine loses power
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. Air cleaner is dirty.
3. Oil level in the crankcase is low.
4. Cooling fins and air passages for the
engine are plugged.
5. Vent hole in the fuel cap is plugged.
6. Dirt in fuel filter.
7. Dirt, water, or stale fuel is in the fuel
system.
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. Tire pressure in drive tires not correct.
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.
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. Drive belt is off pulley.
2. Deck belt is worn, loose or broken.
3. Deck belt is off pulley.
4. Broken or missing idler spring.
5. Damaged electric clutch.
48
Corrective Action
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. Clean or replace the fuel cap.
6. Replace the fuel filter.
7. Contact an Authorized Service Dealer.
1. Reduce the ground speed.
2. Add oil to the crankcase.
3. Remove the obstructions from the
cooling fins and air passages.
1. Adjust tire pressure in the drive tires.
1. Tighten the bypass valve.
2. Change the belt.
3. Change the belt.
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. Check belt for damage; replace if
necessary. Install drive belt and check
adjusting shafts and belt guides for correct
position.
2. Install new deck belt.
3. Install deck pulley and check the idler
pulley, idler arm and spring for correct
position and function.
4. Replace the spring.
5. Contact an Authorized Service Dealer.