Service Manual

7-5
WPM Drive Systems Manual
WHEELPINIONCLUTCH
4. Check all components at this time for damage and
wear. Pay particular attention to the grooves at
the end of the output shaft, the bearing surfaces
on the output shaft, and the wheel pinion clutch
components. Replace parts as necessary.
5. Check the innermost groove on the output shaft
which is located 2-1/4” (5.7cm) in from the end of the
shaft; make sure that the O-ring seal is present and
intact. This seal is important to keep grease in and
contaminants out. Replace it (Item 6) if necessary
(Fig. 170). Some models do not have this O-ring.
RearHeight-of-CutandWheelPinionClutch
-Assembly
1. Pack the caged needle bearing with grease, then
press into the outside of the pivot arm until it is ush
with the groove that houses the externally tabbed
thrust washer.
2. Press the oil impregnated bushing into the boss on
the pivot arm until it is ush with the face of the boss.
3. If spring arm disassembly was required, install the
knob making sure that the detent is pressed out
about .060” (1.5mm). Install the spring arm knob so
that the concave side of the knob and the convex
side of the rivet align.
4. Assemble the spring arm and pivot arm as shown in
Figure 171.
6. Press the needle bearing and the oil impregnated
bushing from the pivot arm using an arbor press.
7. Removal of the grease tting is not recommended
because it is pressed in. However, if damaged or
lost, we suggest tapping and installing a threaded
grease tting.
8. If the spring arm knob requires replacement, push in
on the detent tab, then pull the knob straight off.
Note: Thedetentrivetisnotreplaceable.
Fig170 gear case wheel assy 2
Fig171 3428-0028
A. Pivot arm C. Key
B. Friction washer D. Spring arm
B
D
C
A