Servicing The Fuel Filter - Toro 74177 Operator's Manual

Removing the Spark Plug
1. Disengage the power take off (PTO), set the parking
brake, and turn the ignition key to off. Remove the
key.
2. Pull the wire(s) off the spark plug(s) (Fig. 40). Now
clean around the spark plug(s) to prevent dirt from
falling into the engine and potentially causing damage.
3. Remove the spark plug(s) and metal washer.
2
Figure 40
1. Spark plug wire
Checking the Spark Plug
1. Look at the center of the spark plug(s) (Fig. 41). 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. 41). Bend the side electrode if the gap is not
correct.
(s)
1
m–4089
2. Spark plug
32
2
1
Figure 41
1. Center electrode insulator
2. Side electrode
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 20 ft-lb (27 N.m).
3. Push the wire(s) onto the spark plug(s) (Fig. 40).

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 power take off (PTO), set the parking
brake, and turn the ignition key to off. Remove the
key.
2. Close fuel shut-off valve on console.
3. Squeeze the ends of the hose clamps together and slide
them away from the filter (Fig. 42).
4. Remove the filter from the fuel lines.
5. Install a new filter and move the hose clamps close to
the filter (Fig. 43).
6. Open fuel shut-off valve on console.
3
0.030 in.
(0.76 mm)
m–3215
3. Air gap (not to scale)
(s)