Taylor-Dunn B0-248-TT Operation, T Roubleshooting And Replacement Parts Manual page 80

Maintenance, Service, and Repair
Cross threading the nuts will damage the
3rd member housing and bearing caps. If
the housing and/or nuts are damaged, the
entire 3rd member assembly may have to
be replaced.
17. Install the bearing caps in their original locations
and torque the bolts to 12-15 ft-lbs. making sure
that the adjusting nuts still turn freely.
NOTE: In the following procedure, "Left adjusting nut"
refers to the nut on the ring gear side of the
differential assembly. "Right adjusting nut"
refers to the nut on the pinion gear side of
the differential assembly.
The differential bearing preload is set by measuring the
case spread of the 3rd member housing. As the bearing
adjusting nuts are tightened, the two differential bearing
caps will be pushed (spread) away from each other. A
dial indicator must be used to measure the case spread
as the nuts are tightened. Mount the dial indicator so
that it is 4 inches above the top of the bearing caps and
parallel to the center line of the carrier bearings.
F2/F3 Transmission
Page 10
NOTE: Be sure to continually rotate the ring gear while
adjusting the bearings. This makes sure that
the bearings and races remain seated
correctly.
NOTE: One hole on adjusting nut = approximately
0.003" change in 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.
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 backlash that is supplied
with the gear set
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.