Fuel System Maintenance; Replacing The Fuel Filter - Toro 74448 Operator's Manual

Checking the Spark Plugs
Service Interval: Every 100 hours
1. Look at the center of the spark plugs (Figure 33).
If you see light brown or gray on the insulator, the
engine is operating properly. A black coating on the
insulator usually means that the air cleaner is dirty.
2. If needed, clean the spark plug with a wire brush to
remove carbon deposits.
Figure 33
1. Center electrode insulator
2. Side electrode
Important: Always replace the spark plugs
when it has a black coating, worn electrodes,
an oily film, or cracks.
3. Check the gap between the center and side electrodes
(Figure 33). Bend the side electrode (Figure 33) if
the gap is not correct.
Installing the Spark Plugs
1. Install the spark plugs and the metal washer. Ensure
that the air gap is set correctly.
2. Tighten the spark plugs to 16 ft-lb (22 N⋅m).
3. Connect the wires to the spark plugs (Figure 33).
3. Air gap (not to scale)
Fuel System
Maintenance

Replacing the Fuel Filter

Service Interval: Every 200 hours—Replace the fuel
filter
Never install a dirty filter if it is removed from the fuel
line.
1. Disengage the PTO, move the motion control levers
to the neutral locked position, and set the parking
brake.
2. Stop the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position.
3. Allow the machine to cool down.
4. Stop the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position.
5. Close the fuel shutoff valve (Figure 34).
1. Hose clamp
2. Fuel line
6. Squeeze the ends of the hose clamps together and
slide them away from the filter (Figure 34).
7. Remove the filter from the fuel lines.
8. Install a new filter and move the hose clamps close
to the filter (Figure 34).
9. Open the fuel shutoff valve.
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Figure 34
3. Filter