JLG 26MRT Service Manual - Manual (Page 33)

SECTION 2 - PROCEDURES
3120892 – JLG Sizzor – 2-21
NOTE: Figure 2-17 shows the arrow in the pinion pointing in
two directions. The direction of the arrow pointing
towards the end yoke indicates that by removing pin-
ion locating shims, the distance from the center line
of the axle to the pinion button is increased, giving a
plus reading. The preload shim pack does not affect
the pinion depth setting. Arrows on the ring gear
illustrate the method to increase or decrease back-
lash and differential bearing preload.
Differential Assembly
1. Place the differential assembly (with the pinion
assembled) into the carrier housing. The differential
master bearings should still be installed to the differ-
ential case.
2. Set up a dial indicator (Dana part no. D-128). Be
sure to locate the dial indicator on the same ring
gear screw. Force the ring gear to mesh with the pin-
ion gear. Rock the ring gear to allow the teeth of the
gears to mesh. With force still applied to the differen-
tial case, set the indicator to zero (0).
3. Force the differential assembly (ring gear) away
from the pinion gear to obtain an indicator reading.
Repeat until the same reading is obtained each time.
This reading will be the necessatry amount of shims
between the differential case and the differential
bearing on the ring gear side. Remove the indicator
and differential case from the carrier. Remove the
master bearings from the differential case.
4. Assemble the required amount of shims onto the dif-
ferential case hub (ring gear side) as determined in
step 3. Place the bearing cone on the hub. Use a
bearing installer and handle (Dana part nos. D-156
and S-417) to seat the bearing cone.
5. Assemble the remaining shims of the total shim
pack to the opposite side of the differential case.
Add an additional 0.381 mm (0.015 in) of shims on
this side to compensate for the differential bearing
preload. Assemble the differential bearing using the
same tools used in step 4.
6. Install a spreader and indicator and carefully spread
the carrier housing, but DO NOT spread the carrier
over 0.381 mm (0.015 in). Remove the indicator.
7. Assemble the differential bearing cups to the differ-
ential bearing cones. Install the differential assembly
into the carrier housing.
8. Install the differential assembly into the carrier hous-
ing. Use a rawhide hammer to seat the differential
assembly into the cross bore of the carrier housing.
Care should be taken to avoid nicking the teeth of
the ring gear and pinion during assembly.
9. Install the bearing caps and secure with screws.
Make sure the letters stamped on the caps corre-
spond with those on the carrier housing. Using a
suitable torque wrench (Dana part no. C-524-A),
torque the bearing cap screws to 95-122 Nm (70-90
ft. lb.).
10. Check the ring gear and pinion backlash in three
equally spaced points. Backlash tolerance is 0.127
to 0.203 mm (0.005 to 0.008 in) and cannot vary
more than 0.051 mm (0.002 in) between points
checked.
• High backlash is corrected by moving the ring gear
closer to the pinion.
• Low backlash is corrected by moving the ring gear
away from the pinion.
• These corrections are made by switching shims from
one side of the differential case to the other.
If the backlash is to specification, check the ring gear and
pinion as outlined in the following paragraph, then adjust
as necessary.
11. When all adjustments have been completed, install a
new cover gasket and install the cover plate, secur-
ing it with carrier cover bolts. Using a suitable torque
wrench (Dana part no. C-524-A), torque bolts to 41-
54 Nm (30-40 ft. lb.).
Figure 2-17. Carrier Section