Installation; Parking Brake Adjustment - Komatsu 830E Shop Manual

Installation

Do not start the truck engine until the parking
brake has been installed, adjusted, and the
hydraulic brake lines are tightly connected.
Before installing the park brake caliper, the caliper
mounting must be checked to determine that caliper
is centered over the disc.
Refer to "Caliper, Disc, And Parking Brake Installa-
tion", (determination of Dimension "B"), in Armature
Speed Rear Disc Brakes section. Shim disc as nec-
essary.
NOTE: Do not apply any hydraulic pressure to
release the parking brake until installation and
adjustment are completed.
1. Loosen clamp capscrew (3, Figure 7-2) on yoke
of parking brake caliper. Loosen jam nut (17)
on adjuster capscrew (16).
2. Open bleeder to each piston and push linings
back to obtain disc clearance. Retighten bleed-
ers.
3. Install park brake caliper onto park brake
adapter. Lubricate the threads of mounting cap-
screws (2, Figure 7-1) with rust preventative
grease and tighten to 310 ft.lbs. (420 N.m)
torque.
4. Install hydraulic supply line to park brake cali-
per.
J7-2

Parking Brake Adjustment

Do not start truck engine until both parking brake
assemblies have been installed, adjusted, and all
hydraulic brake lines are tightly connected.
1. Block all wheels, front and rear, to prevent truck
from moving.
2. Loosen clamp capscrew (3, Figure 7-2) which
secures the yoke to the housing.
3. Loosen the jam nut (17).
4. Loosen adjusting bolt (16) until the bolt does not
contact the spring retainer (15).
5. Tighten clamp capscrew (3) finger tight until no
gap exists between yoke (1) and housing (2),
but yoke must be free to slide on housing.
6. Be sure the yoke is positioned inside housing
groove and the end of the adjuster bolt are cen-
tered on the spring retainers (15).
7. Turn adjusting bolt (16) IN (clockwise) until
both the inboard and outboard linings (5)
just touch the brake disc. Use long feeler
gauge [0.001 - 0.002 in. (0.0002 - 0.0005 mm)]
to be sure linings are in contact with disc; gauge
should not slide in between disc and lining.
8. Turn adjusting bolt (16) IN (clockwise) an addi-
tional 4 1/4 turns to obtain proper brake force.
NOTE: The torque to obtain 4 1/4 turns should NOT
exceed 220 ft. lbs. (298 N.m). If torque exceeds this
value, repeat steps 2 - 8. If torque to obtain 4 1/4
turns still exceeds 220 ft. lbs. (298 N.m), remove
park brake caliper and check for improper assembly.
Rebuild caliper assembly correctly and reinstall
following ALL specified procedures. Repeat steps 1 -
8 above.
9. Tighten clamp capscrew (3) to 125 ft.lbs. (170
N.m) torque to lock yoke (1) to housing (2).
10. Turn adjusting bolt (16) OUT (counterclockwise)
1/4 turn.
11. Hold adjusting bolt (16) to prevent turning in
either direction and tighten jam nut (17).
Rockwell Parking Brake J07013