Fuel Filter; Spark Plug - Toro 74175 Operator's Manual

Checking the Spark Plug
Clean or replace spark plug and set gap every 100
hours.
1. Look at the center of the spark plug(s) (Fig. 30).
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: Always replace the spark
plug(s) when it has a black coating, worn
electrodes, an oily film, or cracks.
2. Clean the electrode by scraping or with a wire
brussh to remove carbon deposits and wetness.
3. Check the gap between the center and side
electrodes (Fig. 30). Bend the side electrode
(Fig. 30) if the gap is not correct.
2
1
Figure 30
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 16 ft-lb (22 N.m).
3. Push the wire(s) onto the spark plug(s) (Fig. 29).
3
0.030 in.
(.75 mm)
m–3215
3. Air gap (not to scale)
(s)

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" to stop the engine. 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. 31).
4. Remove the filter from the fuel lines.
5. Install a new filter and move the hose clamps
close to the filter (Fig. 32).
6. Open fuel shut-off valve on console.
2
1
Figure 31
1. Filter
Maintenance
2. Hose clamp
43