Troubleshooting - Toro 74310 Operator's Manual

Troubleshooting

Problem
The starter does not crank.
The engine does not start, starts hard, or
fails to keep running.
The engine loses power.
The engine overheats.
The mower pulls left or right (with levers
fully forward).
Possible Cause
1. PTO is engaged.
2. The parking brake is not set.
3. The speed control lever is not in neutral
position.
4. The battery does not have a full
charge.
5. The electrical connections are
corroded, loose or faulty.
6. The fuse is blown.
7. The relay or switch is worn or
damaged.
1. The fuel tank is empty.
2. The fuel-shutoff valve is closed.
3. The oil level in the crankcase is low.
4. The throttle and choke are not in the
correct position.
5. There is dirt in the fuel filter.
6. There is dirt, water, or stale fuel is in
the fuel system.
7. The air cleaner is dirty.
8. The electrical connections are
corroded, loose, or damaged.
9. The relay or switch is worn or
damaged.
10. The spark plug is fouled or improperly
gapped.
11. The spark-plug wire is not connected.
1. The engine load is excessive.
2. The air cleaner is dirty.
3. The oil level in the crankcase is low.
4. The cooling fins and the air passages
above the engine are plugged.
5. The vent hole in the fuel cap is plugged.
6. There is dirt in the fuel filter.
7. There is dirt, water, or stale fuel is in
the fuel system.
1. The engine load is excessive.
2. The oil level in the crankcase is low.
3. The cooling fins and air passages for
the engine are plugged.
1. The tracking needs adjustment.
2. The tire pressure in drive tires not
correct.
3. The reverse indicator and speed
control linkage need adjustment.
56
Corrective Action
1. Disengage the PTO.
2. Set the parking brake.
3. Ensure the speed control lever is in the
neutral position.
4. Charge the battery.
5. Check the electrical connections for
good contact.
6. Replace the blown fuse.
7. Contact an Authorized Service Dealer.
1. Fill the fuel tank.
2. Open the fuel-shutoff valve.
3. Add oil to the crankcase.
4. Be sure the throttle control is midway
between the "SLOW" and "FAST"
positions, and the choke is in the
closed/on position for a cold engine
(except Kohler EFI) or the open/off
position for a warm engine.
5. Replace the fuel filter.
6. Contact an Authorized Service Dealer.
7. Clean or replace the air-cleaner
element.
8. Check the electrical connections
for good contact. Clean the
connector terminals thoroughly with
electrical-contact cleaner, apply
dielectric grease, and make the
appropriate connections.
9. Contact an Authorized Service Dealer.
10. Adjust or replace the spark plug.
11. Check the spark-plug wire connection.
1. Reduce the ground speed.
2. Clean the air-cleaner element.
3. Add oil to the crankcase.
4. Remove the obstruction from the
cooling fins and the 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 the tracking.
2. Adjust tire pressure in the drive tires.
3. Adjust the reverse indicator and the
speed control linkage.