Servicing the Spark Plugs
Service Interval:
Every 100 hours—Check and gap the
spark plugs.
Make sure that 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 :
NGK BPR4ES or equivalent
Air Gap:
0.76 mm (0.030 inch)
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 N
EUTRAL
-
LOCK
position, and set the parking brake.
3.
Remove the left hydraulic-unit shroud in the order
listed in
.
Note:
This gives you access to the front spark plug.
Figure 51
1.
Pull this tab out to the
side in the direction of the
arrow.
3.
Pull the shroud off this
frame tab in the direction
of the arrow.
2.
Pull the shroud off this
frame tab in the direction
of the arrow.
4.
Shroud
4.
Remove the spark plug.
G008803
B
A
g027478
Figure 52
5.
Install the left hydraulic-unit shroud (
Checking the Spark Plugs
Important:
Do not 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 that the air cleaner is dirty.
Set the gap to 0.76 mm (0.030 inch).
B
A
g027479
Figure 53
38
