Servicing The Fuel Filter - Toro Z555 74245 Operator's Manual

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Figure 39
1. Spark plug wire
Checking the Spark Plug
1. Look at the center of the spark plug(s) (Fig. 40). If you
see light brown or gray on the insulator, the engine is
operating properly. A black coating on the insulator
usually means the air cleaner is dirty.
Important
Never clean the spark plug(s). Always
replace the spark plug(s) when it has: a black coating,
worn electrodes, an oily film, or cracks.
2. Check the gap between the center and side electrodes
(Fig. 40). Bend the side electrode (Fig. 40) if the gap is
not correct.
2
1
Figure 40
1. Center electrode insulator
2. Side electrode
1
2
2. Spark plug
3
0.030 inch
(0.75 mm)
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3. Air gap (not to scale)
33
Installing the Spark Plug
1. Install the spark plug(s). Make sure the air gap is set
correctly.
2. Tighten the spark plug(s) to 16 ft.-lb. (22 N⋅m).
3. Push the wire(s) onto the spark plug(s) (Fig. 39).

Servicing the Fuel Filter

Replace the fuel filter after every 200 operating hours or
yearly, whichever occurs first.
Replacing 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 engine to cool down.
4. Close the fuel shut–off valve (Fig. 41).
1
2
Figure 41
1. Filter
2. Fuel shut-off valve
5. Squeeze the ends of the hose clamps together and slide
them away from the filter (Fig. 41).
6. Remove the filter from the fuel lines.
7. Install a new filter and move the hose clamps close to
the filter to secure the fuel line (Fig. 41).
8. Wipe up any spilled fuel.
9. Open the fuel shut-off valve.
(s)
3
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3. Hose clamp