Re-Shimming The Pinion Housing - Taylor-Dunn SC-001-59 Operation, T Roubleshooting And Replacement Parts Manual

Transmission
NOTE: Be sure to continually rotate the ring gear while adjusting the
NOTE: One hole on adjusting nut = approximately 0.003" change in
18. Loosen the right side nut.
19. Tighten the left nut until all backlash is removed from the ring and pinion gear.
20. Tighten the right nut until a case spread of 0.010" is indicated on the dial indicator.
NOTE: If new ring and pinion gears are used, refer to the recommended
21. Measure the backlash. If the backlash is not within 0.002" of the original measurement taken on
disassembly or the recommended setting for new gears, then readjust the bearings as follows:
To increase backlash, loosen the left spanner nut and then tighten the right spanner nut the
same amount.
To decrease backlash, loosen the right spanner nut and then tighten the left spanner nut the
same amount.
22. Apply gear marking compound on both sides of 7 to 10 teeth on the ring gear.
23. While applying resistance to the pinion shaft, rotate the ring gear back and forth (not full
revolutions) until a clear contact pattern is shown. Compare the contact pattern to the illustration
on the following page and reshim the pinion housing or adjust the backlash as indicated on the
illustration . If the pinion housing is reshimed the backlash must be reset. Go back and repeat
ALL procedures in setting the backlash.
24. Tighten the bearing cap bolts to 70-85 ft/lbs (F2 drive), 55-70 ft/lbs (F3 drive) and install the
spanner nut locks. Tighten the spanner nut lock bolts to 12-25 ft/lbs.
NOTE: Final pinion nut torque on completely assembled drive, 175 ft/lbs.

RE-SHIMMING THE PINION HOUSING

The pinion housing shim may require replacement if the ring and pinion gear or pinion housing is
replaced.
Pinion housing shims are available from 0.005" to 0.021" in increments of 0.001". Locate the number
printed on the flat surface of the pilot bearing shaft of the pinion gear. It should be a number ranging
from -5 to +5. This is the amount in 0.001" increments to add to the "standard" shim. For example, if the
number on the shaft is '-3' then the standard shim (0.015) plus '-3' equals 0.012. The correct shim would
be 0.012".
If you cannot locate the number on the shaft, start with the standard shim and adjust as required per the
contact pattern chart on the following page.
bearings. This makes sure that the bearings and races remain
seated correctly.
backlash. Left and right nuts MUST be turned the same amount
AND in the same direction. The final direction of rotation MUST be
in the tightening direction, to loosen a nut 1-hole, back off 2-holes
and then tighten 1 hole. The ring gear should be rotated any time
the nuts are being adjusted.
backlash that is supplied with the gear set
Transmission Page 18