23
4. Clean around the spark plugs to prevent dirt from
falling into the engine and potentially causing damage.
5. Remove the spark plugs and metal washers.
2
1
m–3246
Figure 30
1.
Spark plug wire
2.
Spark plug
Checking the Spark Plugs
1. Look at the center of the spark plugs (Fig. 31).
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
Do not clean the spark plugs. Always
replace a spark plug when it has a black coating, worn
electrodes, an oily film, or cracks.
2. Check the gap between the center and side electrodes
(Fig. 31) and bend the side electrode, if the gap is not
correct.
0.030”
(0.76 mm)
2
3
1
m–3215
Figure 31
1.
Center electrode insulator
2.
Side electrode
3.
Air gap (not to scale)
Installing the Spark Plug
s
1. Install the spark plugs and metal washers.
2. Ensure that the air gap is set correctly.
3. Tighten the spark plugs to 18 to 22 ft-lb (24.4 to
29.8 Nm).
4. Push the wires onto the spark plugs (Fig. 30).
5. Close the hood.
Greasing the Tractor
Grease the machine after every 50 operating hours or
yearly, whichever occurs first. Grease more frequently
when operating conditions are extremely dusty or sandy.
Grease Type: General-purpose grease.
How to Add Grease
1. Disengage the PTO, set the parking brake, lower the
attachment lift, stop the engine, and remove the
ignition key.
2. Clean the grease fittings with a cloth.
3. Scrape off any paint from the fittings.
4. Connect a grease gun to each fitting in turn.
5. Pump grease into the fittings until grease begins to
ooze out of the bearings.
6. Wipe up any excess grease.
Where to Add Grease
1. Lubricate the left-hand and right-hand spindles until
grease begins to ooze out of the bearings (Fig. 32).
2. Lubricate the front axle pivot (Fig. 32).
m–3240
Figure 32
3. Open the drive shaft maintenance cover on the tractor
tunnel near the seat by unscrewing the two screws
securing it, then raising it (Fig. 33).
Summary of Contents for Wheel Horse 520xi
Page 6: ...6 Slope Chart...
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