Toro 74946 Operator's Manual page 71

Problem
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).
The machine does not drive.
Possible Cause
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 is not in the correct
position.
5. There is dirt in the fuel filter.
6. There is dirt, water, or stale fuel in the
fuel system.
7. The air cleaner is dirty.
8. The seat switch is not functioning
properly.
9. The electrical connections are
corroded, loose, or damaged.
10. The relay or switch is worn or
damaged.
11. The spark plug is fouled or improperly
gapped.
12. 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 in the
fuel system.
1. The engine load is excessive.
2. The oil level in the crankcase is low.
3. The cooling fins and the air passages
above the engine are plugged.
1. The tracking needs adjustment
2. The tire pressure is not correct in the
drive tires.
1. The bypass valves are not closed tight.
2. The pump belt is worn, loose or broken.
3. The pump belt is off a pulley.
4. The idler spring is broken or missing.
5. The hydraulic oil level is low or too hot.
71
Corrective Action
1. Fill the fuel tank.
2. Open the fuel-shutoff valve.
3. Add oil to the crankcase.
4. Be sure that the throttle control is
midway between the slow and fast
positions.
5. Replace the fuel filter.
6. Contact an Authorized Service Dealer.
7. Clean or replace the air-cleaner
element.
8. Check the seat-switch indicator.
Replace the seat if necessary.
9. Check the electrical connections
for good contact. Clean the
connector terminals thoroughly with
electrical-contact cleaner, apply
dielectric grease, and make the
appropriate connections.
10. Contact an Authorized Service Dealer.
11. Adjust or replace the spark plug.
12. 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 obstruction from the
cooling fins and the air passages.
1. Adjust the tracking.
2. Adjust tire pressure in the drive tires.
1. Tighten the bypass valves.
2. Change the belt.
3. Change the belt.
4. Replace the spring.
5. Add hydraulic oil to reservoirs or let it
cool down.