Toro 20330 Service Manual - Page 81

Rear Height-of-Cut and Wheel Pinion Clutch, Assembly

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WHEEL PINION CLUTCH 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. 6. Press the needle bearing and the oil impregnated bushing from the pivot arm using an arbor press. 7. Removal of the grease fitting is not recommended because it is pressed in. However, if damaged or lost, we suggest tapping and installing a threaded grease fitting. 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 flush 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 flush 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. Fig 137 gearcase wheel assy 2 WPM Drive Systems Manual 5-5

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5-5
WPM Drive Systems Manual
WHEEL PINION CLUTCH
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.
Fig 137
gearcase wheel assy 2
1.
Pack the caged needle bearing with grease, then
press into the outside of the pivot arm until it is flush
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 flush 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.
6.
Press the needle bearing and the oil impregnated
bushing from the pivot arm using an arbor press.
7.
Removal of the grease fitting is not recommended
because it is pressed in. However, if damaged or
lost, we suggest tapping and installing a threaded
grease fitting.
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