Rear Height-Of-Cut & Wheel Pinion Clutch - Assembly - Toro 20330 - Low Wheel Walk Power Mower Service Manual

2. Remove the special retaining clip at the end of the
output shaft and pull off the following six wheel
pinion clutch components:
• Spring
• Internally tabbed thrust washer
• Wheel pinion
• Wheel pinion key
• Clutch washer
• Friction ring
3. Remove the inner special retaining clip from the
output shaft and remove the following components:
• Internally tabbed thrust washer
• Externally tabbed thrust washer
• Pivot arm and spring arm assembly
• End cap (if desired)
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. 137). Some models do not have this O-ring.
WPM Drive Systems Manual
Fig 137 gearcase wheel assy 2
WHEEL PINION CLUTCH
6. Press the needle bearing and the oil impregnated
bushing from the pivot arm using an arbor press.
7. Removal of the grease fi tting is not recommended
because it is pressed in. However, if damaged or
lost, we suggest tapping and installing a threaded
grease fi 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.
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 fl 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 fl 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.
5-5