Brake Installation - Komatsu 930E-2 Shop Manual

NOTE: Measure the shims individually for accuracy.
The above procedure results in a shim pack which will
provide a nominal 0.020 in. (0.508 mm) preload for the
bearings after assembly.
Example:
Step 19 (average depth)
Step 21 subtract etched dim
Step 22 Required shim pack = 0.041 in.
NOTE: After a shim pack has been determined, the
shim pack, spindle, wheel hub, spacer, and bearings
are now an interdependent group. If any of the parts
are replaced, the shim pack is no longer valid, and a
new pack must be calculated.
15. Remove bearing retainer (13), outer cone (7),
outer retainer pin (40), and wheel hub (1) from
spindle (26) for installation of the brake assembly.

Brake Installation

16. Position the wheel hub vertically, on blocking with
the inner bearing bore at top.
17. Assemble brake to hub as follows:
a. Install nine 0.020 in. (0.51 mm) thick shims (36)
on top of the wheel hub flange at each of the
six gear/seal retainer mounting locations.
b. Install speed sensor gear (35).
c. Install new O-ring (38) in groove in hub. Be
certain O-ring is not twisted. Apply lubricant to
O-ring.
d. Install lift eyes in brake assembly and attach to
overhead hoist.
e. Align hub and seal carrier (37) mounting holes
and lower brake assembly onto hub.
NOTE: Do not remove shipping bars until inner gear
ring of brake assembly is attached to hub
f. Install capscrews (14) and washers (15) from
under hub flange to secure the seal carrier and
gear. Tighten capscrews to standard torque.
g. Align the brake hub holes with the wheel hub
and install hardened flatwashers (24) and cap-
screws (23). Tighten capscrews to 1995 ft. lbs.
(2705 N.m) torque.
h. Remove shipping bars from brake assembly.
18. Install a new O-ring (25) to brake adapter (19).
Place the assembly into position on the spindle.
19. Install hardened flatwashers (32) and capscrews
(31). Tighten capscrews to 1995 ft. lbs. (2705
N.m) torque.
G3-8
Socket head capscrews (34) are installed to posi-
1.416 in.
tion the seal carrier on the brake back plate after
- 1.375 in. assembly and prior to installation on the Hub/spin-
dle. In the next step, it may be necessary to loosen
the socket head capscrews slightly to align the
brake assembly holes with the brake adaptor.
NOTE: The following instructions must be performed
carefully to prevent damage during assembly to brake
adaptor O-ring seal (22).
20. Prior to installing the hub and brake assembly on
21. Attach an overhead hoist to wheel hub and brake
NOTE: The hoist must be rigid enough to prevent
"springing" or "jerking" as the hub and brake assembly
is lowered into position.
22. Lift hub over spindle and slowly lower, aligning the
Front Wheel Hub and Spindle
the spindle, install four alignment studs, spaced
90° apart, in the brake adaptor (in place of cap-
screws (20) to ensure the brake assembly is prop-
erly aligned during the following steps.
a. Install a new O-ring (22) on brake adaptor
shoulder. Be certain the O-ring is not twisted
and properly seated.
b. Lubricate the O-ring with petroleum jelly or
chassis grease.
assembly. Rotate hub 180° in preparation for low-
ering onto spindle.
brake mounting holes with the alignment studs.
a. When the brake piston housing is approxi-
mately 0.50 in. (13 mm) from the adaptor,
install four capscrews (20) and flatwashers
(21) spaced evenly in between the alignment
studs.
b. Carefully pull the brake and wheel hub assem-
bly into position by tightening the capscrews
evenly and in small increments.
c. DO NOT allow the assembly to "cock" (stick at
an angle). If the assembly is cocked, lift the
assembly, and inspect O-ring (22) for damage.
Replace the O-ring if necessary, and repeat
the assembly procedure.
G03017 02/01