Cleaning The Cooling Systems; Checking The Tire Pressure; Servicing The Fuel Filter - Toro 74225 Operator's Manual

2
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 if the gap is not
correct.
2
1
Figure 40
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. 39).
1
m–4811
2. Spark plug
3
0.030 in.
(0.76 mm)
m–3215
3. Air gap (not to scale)
(s)
34

Cleaning the Cooling Systems

Before each use, check and clean cooling screen. Remove
any build–up of grass, dirt or other debris from the oil
cooler screen and engine air intake. Every 100 hours clean
oil cooler, engine cylinder and cylinder head cooling fins.
Also clean around carburetor, governor levers and linkage.
This will help insure adequate cooling to hydraulic
pumps, motors and engine and will reduce the possibility
of overheating and mechanical damage.
2
Figure 41
1. Engine screen

Checking the Tire Pressure

Maintain the air pressure in the front and rear tires as
specified. Uneven tire pressure can cause uneven cut.
Check the pressure at the valve stem after every 50
operating hours or monthly, whichever occurs first
(Fig. 42). Check the tires when they are cold to get the
most accurate pressure reading.
Pressure: 13 psi (90 kPa) drive wheels and castor wheels.
Figure 42
1. Valve stem

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
Ó Ó
Ó Ó Ó Ó
Ó Ó Ó Ó
m–3801
2. Oil cooler
1
m–1872