Servicing the Spark Plug
Service Interval:
Every 100 hours
Make sure the air gap between the center and side electrodes
is correct before installing the spark plug. Use a spark plug
wrench for removing and installing the spark plug(s) and a
gapping tool/feeler gauge to check and adjust the air gap.
Install a new spark plug(s) if necessary.
Type of Spark Plug:
NGK
®
BPR4ES or equivalent
Air Gap:
0.030 inch (0.75 mm)
Removing the Spark Plug
1.
Stop the engine, remove the key, and wait for all moving
parts to stop before leaving the operating position.
2.
Disengage the PTO, move the motion control levers to
the neutral locked position and set the parking brake.
3.
Remove the lefthand hydraulic unit shroud in the order
listed with Figure 52. This gives you access to the front
spark plug.
Figure 52
1.
Pull this tab out to the
side in the direction of the
arrow
3.
Pull the shroud off of this
frame tab in the direction
of the arrow
2.
Pull the shroud off of this
frame tab in the direction
of the arrow
4.
Shroud
4.
Remove the spark plug.
G008803
Figure 53
5.
Install the lefthand hydraulic unit shroud (Figure 52).
Checking the Spark Plug
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.
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.
Set the gap to 0.030 inches (0.76 mm).
G008794
1
2
Figure 54
Installing the Spark Plug
Tighten the spark plug(s) to 16 ft.-lb (22 N-m).
Figure 55
39
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