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2. Pull the wire(s) off the spark plug(s) (Fig. 23). 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 23
1. Spark plug wire
Checking the Spark Plug
1. Look at the center of the spark plug(s) (Fig. 24). 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. 24). Bend the side electrode (Fig. 24) if the gap is
not correct.
2
1
Figure 24
1. Center electrode insulator
2. Side electrode
1
m–2597
2. Spark plug
3
0.040 in.
(1.02 mm)
m–1870
3. Air gap (not to scale)
28
Installing the Spark Plug
1. Install the spark plug(s) and metal washer. 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. 23).
Greasing the Bearings and
Bushings
The cutting unit must be lubricated regularly. Refer to the
Recommended Maintenance Schedule on page 24. Grease
with No. 2 general purpose lithium base or molybdenum
base grease.
1. Stop the engine, remove the key and disconnect the
spark plug wire(s) from the spark plug(s).
2. Grease the fittings on the three spindle bearings and the
idler arm (Fig. 47).
Note: You'll have to remove the deck cover to access the
grease fitting on the idler arm.
3. Grease the fittings on the carrier frame mounting tubes
and castor wheels (Fig. 25).
Figure 25
1. Carrier Frame Mounting
Tube Grease Fitting
Cleaning the Cooling Systems
Before each use, check and clean hydraulic and engine
cooling systems. 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
(s)
1
2
m-2547
2. Castor Wheel Grease
Fitting
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