Exmark QUEST S Series Operator's Manual page 70

Troubleshooting
Problem
Engine loses power
The machine does not drive.
Abnormal vibration
Uneven cutting height.
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. The spark plug(s) is pitted, fouled, or the
gap is incorrect.
6. Dirt in fuel filter.
7. Dirt, water, or stale fuel is in the fuel
system.
8. There is incorrect fuel in the fuel tank.
9. The fuel tank vent is blocked.
1. The drive belts are worn, loose, or broken.
2. The drive belts are off of the pulleys.
3. The drive is in bypass mode.
1. Engine mounting bolts are loose.
2. Loose engine pulley, idler pulley, or blade
pulley.
3. Engine pulley is damaged.
4. Cutting blade(s) is/are bent or unbalanced.
5. Blade is loose.
6. Blade spindle is bent.
1. Blade(s) not sharp.
2. Cutting blade(s) is/are bent.
3. A blade is loose.
4. Mower deck is not level.
5. An anti-scalp wheel is not set correctly
6. Underside of mower is dirty.
7. Tire pressure in drive tires not correct.
8. Blade spindle bent.
1. Drive belt is worn, loose or broken.
2. Drive belt is off pulley.
3. The mower belt is worn, loose, or broken.
4. The Power Take Off (PTO) switch or
PTO clutch is faulty.
70
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. Install a new, correctly gapped spark
plug(s).
6. Replace the fuel filter.
7. Contact an Authorized Service Dealer.
8. Drain the tank and replace the fuel with
the proper type.
9. Contact an Authorized Service Dealer.
1. Contact an Authorized Service Dealer.
2. Contact an Authorized Service Dealer.
3. Take machine out of bypass mode. Refer
to Pushing the Machine by Hand
section.
1. Tighten the engine mounting bolts.
2. Tighten the appropriate pulley.
3. Contact an Authorized Service Dealer.
4. Install new cutting blade(s).
5. Tighten the blade mounting bolt and
inspect the blade spring disc washer for
damage (See Servicing the Cutting
Blades section).
6. Contact an Authorized Service Dealer.
1. Sharpen the blade(s).
2. Install new cutting blade(s).
3. Tighten the blade mounting bolt and
inspect the blade spring disc washer for
damage (See Servicing the Cutting
Blades section).
4. Level mower deck from side-to-side and
front-to-rear.
5. Adjust the anti-scalp wheel height.
6. Clean the underside of the mower.
7. Adjust tire pressure.
8. Contact an Authorized Service Dealer.
1. Install new drive belt.
2. Install drive belt and check adjusting
shafts and belt guides for correct position.
3. Install a new mower belt.
4. Contact an Authorized Service Dealer.