Toro 74570 - The engine will not start, starts hard, or fails to keep running.; The engine loses power.; There is abnormal vibration.

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