Toro 74590 Operator's Manual page 34

Problem
The engine will not start, starts g
hard, or fails to keep running. h d f il t k i
The engine loses power. g
There is abnormal vibration.
Possible Causes
1. The operator is not seated.
2. The fuel tank is empty.
3. The air cleaner is dirty.
4. The spark plug wire is loose or
disconnected.
5. A spark plug is pitted, fouled, or
the gap is incorrect.
6. The choke is not closing.
7. There is dirt in the fuel filter.
8. The idle speed is too low or the
mixture is incorrect.
9. Dirt, water, or stale fuel is in the
fuel system.
10.The fuel shut-off valve is
closed.
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 air
passages under the engine
blower housing are plugged.
5. The spark plug is pitted, fouled,
or the gap is incorrect.
6. The vent hole in the fuel cap is
plugged.
7. There is dirt in the fuel filter.
8. Dirt, water, or stale fuel is in the
fuel system.
1. The cutting blade(s) is bent or
unbalanced.
2. The blade mounting screws are
loose.
3. The engine mounting bolts are
loose.
4. There is a loose engine pulley,
idler pulley, or blade pulley.
5. The engine pulley is damaged.
6. The blade drive belt is
damaged.
34
Corrective Action
1. Sit on the seat.
2. Fill the fuel tank with gasoline.
3. Clean or replace the air cleaner
element.
4. Install the wire on the spark
plug.
5. Install a new, correctly-gapped
spark plug.
6. Adjust the throttle cable.
7. Replace the fuel filter.
8. Adjust the carburetor idle
speed and idle mixture.
9. Contact an Authorized Service
Dealer.
10.Open the fuel shut-off valve.
1. Reduce your ground speed.
2. Clean the air cleaner element.
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. Install a new cutting blade(s).
2. Tighten the blade mounting
screws.
3. Tighten the engine mounting
bolts.
4. Tighten the appropriate pulley.
5. Contact an Authorized Service
Dealer.
6. Install a new blade drive belt.