Brake Rebuild; Rear Wheel Brake Only; Both Front And Rear Wheel Brakes; Brake Assembly - Komatsu 930E-2 Shop Manual

BRAKE REBUILD

• The brake assembly should be disassembled
and reassembled on a clean, dry work surface.
The surface should be wooden or if metal, cov-
ered with padding to prevent damaged to ma-
chined surfaces.
• Match mark individual parts for correct orienta-
tion prior to disassembly.
• If a rear wheel brake is to be disassembled,
start with step 1 below. If a front wheel brake is
to be disassembled, start the disassembly pro-
cedure at step 5.
The front brake assembly weighs approximately
3210 lbs. (1460 kg) The rear brake assembly
weighs approximately 4000 lbs. (1820 Kg).
Be certain lifting devices are rated to handle the
load.

Disassembly

Rear Wheel Brake Only:

Refer to Wheel Motor Rebuild instructions for rear
wheel brake assembly removal.
1. Verify socket head capscrews (3, Figure 5-1) are
installed at each of the six locations on the back
plate (11). These capscrews are required to retain
the seal carrier (10) to the back plate when the
brake assembly is not installed on the truck.
Shipping bars (4, Figure 5-4) must be installed.
2. Remove the 12-point capscrews and hardened
washers (5, Figure 5-1).
3. Remove capscrews and lockwashers (2) used to
retain the hub to the seal carrier.
4. Be certain hub and other parts are marked to
ensure proper orientation during reassembly. Lift
the hub adaptor (1) from brake assembly. Be
certain to note shim packs installed at six loca-
tions on between seal carrier and hub.

Both Front and Rear Wheel Brakes:

Remove the front wheel brake assembly according to
the instructions in "Front Wheel Hub and Spindle",
Section "G".
5. Position brake assembly on work surface with ring
gear retainer bars on bottom as shown in Figure
5-5.
J5-4
FIGURE 5-4. BRAKE ASSEMBLY
(Shown Prepared for Shipping or Storage)
1. Ring Gear
2. Back Plate
3. Capscrew
6. Remove socket head capscrews (2, Figure 5-5).
Lift seal retainer (1) off brake assembly.
NOTE: Socket head capscrews (2) are required to
retain and position seal carrier on brake back plate
when the brake assembly is not installed on the wheel
hub or during brake assembly shipping or storage.
Shipping bars (4, Figure 5-4) must be installed to retain
the inner gear inside the brake assembly.
7. Remove capscrews (4, Figure 5-5) and hardened
flatwashers (5) from backplate (3).
8. Insert a 7/8 UNC x 2.0 in. pusher bolt in each of
the three tapped holes in the back plate. Tighten
bolts evenly to lift back plate from ring gear (7).
Remove and discard O-ring (6).
9. Noting order of assembly of discs, remove the
damper (10) from top of stack. Remove friction
discs (11), separator plates (9) and remaining
damper at bottom of stack.
10. Rotate the brake assembly to position shipping
bars on top as shown in Figure 5-4.
11. Remove capscrews (3) retaining shipping bars (4)
to housing.
Disc Brake Assembly
4. Shipping/Storage Bar
5. Inner Gear
J05018 03/01