Rear Brake, Hub Installation; Seal Gap Adjustment - Komatsu 930E-2 Shop Manual

NOTE: After a front wheel brake assembly is installed,
the seal must be setup for proper seal compression.
Refer to "Seal Assembly Gap Check" in Section G,
"Front Wheel Hub and Spindle".
19. Assembly is now complete if the brake assembly
is to be installed on a front wheel. If the brake
assembly is to be installed on a rear wheel, follow
the additional steps below.
Rear Wheel Brake Assembly Only:
20. Install a new O-ring (1, Figure 5-11) in hub groove.
21. Position hub over seal carrier. Orient the hub
according to the marks made during disassembly.
to align hub flange holes with seal retainer tapped
holes.
22. Insert the following shims between hub flange and
seal retainer at each pair of capscrews (3) (six
places):
Ten . . . . . . . 0.020 in. (0.51 mm) thick
One (1) . . . . . 0.010 in. (0.25 mm) thick
23. Install capscrews and lockwashers (3) and tighten
securely.
FIGURE 5-11. REAR BRAKE, HUB INSTALLATION
1. O-Ring
2. Hub Adapter
3. Capscrews & Washers
4. Shims
5. Seal Carrier
J5-10
6. Socket Head Cap-
screw
7. Ring Gear
8. Capscrew & Hard-
ened Washer
9. Inner Gear
Disc Brake Assembly

Seal Gap Adjustment:

24. Refer to Figure 5-12 and adjust seal gap:
a. Measure seal gap "A" at three equally spaced
locations. Add the three dimensions and divide
by 3 to determine an average dimension.
b. Add 21.470 in. (545.34 mm) to the average
dimension determined in previous step.
c. Measure dimension "B" at three equally spaced
locations. Add the three dimensions and divide
by 3 to determine the average dimension.
d. Subtract the dimension in step c. from the
dimension in step b. to determine change in
shim pack.
e. Add or remove equal quantities and thick-
nesses of shims to the original shim pack as
determined in step d. at the six shim locations.
The shim pack must provide a final dimension
"B" within .005 in. (0.13 mm) of the dimension
calculated in step b.
Example:
Step a: average gap "A" = .................... 0.600 in.
Step b: add "A" + 21.470 = ................ 22.070 in.
Step c: average dimension "B" = ........ 22.034 in.
Step d: ("A" + 21.391) - ("B")= ............. 0.036 in.
Step e: In this example, adding two 0.020 in.
shims would result in a dimension "B" of
22.074 in., and is within the tolerance limit of
0.005 in.
25. Final tighten capscrews (3, Figure 5-11) to 90 ft.
lbs. (122 N.m) torque.
26. Install capscrews and hardened washers (8). It will
be necessary to remove the shipping bars from
the inner gear to access some capscrews. Alter-
nately tighten capscrews to 1995 ft. lbs. (2705
N.m) torque. Replace shipping bars.
FIGURE 5-12. SEAL GAP ADJUSTMENT
J05018 03/01