Troubleshooting - Toro 74549 Operator's Manual

Troubleshooting

Problem
Engine will not start, starts hard, or fails
to keep running.
Engine loses power.
Engine overheats.
Machine does not drive.
Abnormal vibration.
Possible Cause
1. Fuel tank is empty or shut-off valve
closed.
2. Choke is not on.
3. Spark plug wire is loose or
disconnected.
4. Spark plug is pitted, fouled, or the gap
is incorrect.
5. Air cleaner is dirty.
6. Dirt in the fuel filter.
7. Dirt, water, or stale fuel is in the fuel
system.
8. The gap between the safety interlock
switches is not correct.
1. Engine load is excessive.
2. Air cleaner is dirty.
3. Oil level in the crankcase is low.
4. Cooling fins and air passages under
the engine blower housing are plugged.
5. Spark plug is pitted, fouled, or the gap
is incorrect.
6. Vent hole in the fuel cap is plugged.
7. Dirt in the fuel filter.
8. 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 under
the engine blower housing are plugged.
1. Hydraulic oil reservoir low.
2. Air in the hydraulic system.
3. Pump drive belt slipping.
4. Pump drive belt idler spring missing.
5. Pump by-pass valves are open.
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.
61
Corrective Action
1. Fill fuel tank with gasoline and open
valve
2. Move the choke lever to choke position.
3. Install wire on spark plug.
4. Install a new, correctly gapped spark
plug.
5. Service the air cleaner element.
6. Replace the fuel filter.
7. Contact an Authorized Service Dealer.
8. Contact an Authorized Service Dealer.
1. Reduce the ground speed.
2. Service the air cleaner.
3. Add oil to the crankcase.
4. Remove the obstruction from the
cooling fins and air passages.
5. Install a new, correctly gapped spark
plug.
6. Clean or replace the fuel cap.
7. Replace the fuel filter.
8. 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 air passages.
1. Add hydraulic oil to the reservoir.
2. Bleed the air out the hydraulic system.
3. Replace the pump drive belt.
4. Replace the pump drive belt idler
spring.
5. Tighten the by-pass valves. Torque to
110 to 130 in-lb (12 to 15 N-m).
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.