Troubleshooting
Problem
Possible Cause
Corrective Action
1. The fuel tank is empty or the shutoff
valve is closed.
1. Fill the fuel tank with gasoline and
open the valve
2. A spark-plug wire is loose or
disconnected.
2. Install the wire on spark plug.
3. A spark plug is pitted, fouled, or the
gap is incorrect.
3. Install a new, correctly gapped spark
plug.
4. The air cleaner is dirty.
4. Service the air-cleaner element.
5. Dirt is in the fuel filter.
5. Replace the fuel filter.
6. Dirt, water, or stale fuel is in the fuel
system.
6. Contact an Authorized Service Dealer.
The engine does not start, starts hard, or
fails to keep running.
7. The gap between the safety-interlock
switches is not correct.
7. Contact an Authorized Service Dealer.
1. The engine load is excessive.
1. Reduce the ground speed.
2. The air cleaner is dirty.
2. Service the air cleaner element.
3. The oil level in the crankcase is low.
3. Add oil to the crankcase.
4. The cooling fins and air passages
under the engine blower housing are
plugged.
4. Remove the obstruction from the
cooling fins and air passages.
5. A spark plug is pitted, fouled, or the
gap is incorrect.
5. Install a new, correctly gapped spark
plug.
6. The vent hole in the fuel cap is plugged.
6. Clean or replace the fuel cap.
7. Dirt is in the fuel filter.
7. Replace the fuel filter.
The engine loses power.
8. Dirt, water, or stale fuel is in the fuel
system.
8. Contact an Authorized Service Dealer.
1. The engine load is excessive.
1. Reduce the ground speed.
2. The oil level in the crankcase is low.
2. Add oil to the crankcase.
The engine overheats.
3. The cooling fins and air passages
under the engine blower housing are
plugged.
3. Remove the obstruction from the
cooling fins and air passages.
1. The hydraulic-oil reservoir is low.
1. Add hydraulic oil to the reservoir.
2. Air is in the hydraulic system.
2. Bleed the air out the hydraulic system.
3. A pump-drive belt slips.
3. Replace the pump drive belt.
4. A pump-drive belt idler spring is
missing.
4. Replace the pump drive belt idler
spring.
The machine does not drive.
5. The pump-bypass valves are open.
5. Tighten the bypass valves. Torque to
12 to 15 N∙m (9 to 11 ft-lb).
1. Cutting blade(s) is/are bent or
unbalanced.
1. Install new cutting blade(s).
2. A blade-mounting bolt is loose.
2. Tighten the blade-mounting bolt.
3. The engine-mounting bolts are loose.
3. Tighten the engine-mounting bolts.
4. An engine pulley, idler pulley, or blade
pulley is loose.
4. Tighten the appropriate pulley.
5. An engine pulley is damaged.
5. Contact an Authorized Service Dealer.
There is abnormal vibration.
6. A blade spindle is bent.
6. Contact an Authorized Service Dealer.
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Summary of Contents for 74513
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