Komatsu 830E Shop Manual page 382

FIGURE 6-2. BRAKE CALIPER
1. Capscrews
2. Retainer
3. Calipers
9. Remove two center caliper mount capscrews (4,
Figure 6-3) from outboard caliper and install two
0.875 in., 9 UNC x 14 in. studs.
10. Remove two remaining caliper mount capscrews
and remove outer half of caliper (5).
11. Support disc (16) and remove disc mount cap-
screws (15) and washers. Slide disc from out-
board adapter (8). Shims (13) will be found
between disc and adapter. Remove bushing (14)
and inner half of caliper (5). Remove park brake
bracket (3).
12. Remove capscrews
Remove adapter (8).
13. Remove two center caliper mount capscrews (17,
Figure 6-3) from outboard caliper and install two
0.875 in., 9 UNC x 14 in. studs.
14. Remove two remaining caliper mount capscrews
and remove outer half of caliper (18).
15. Support disc (19) and remove capscrews and flat-
washers (12). Remove inboard disc (19). Remove
shims (6) and bushing (10).
16. Remove inner half of caliper (18).
17. Remove capscrews and flatwashers (7) and
remove adapter (9).
18. Remove capscrews and flatwashers (1) and
remove adapter (2).
J6-2
4. Crossover Tube
5. Bleed Valve
6. Bleed Valve
and flatwashers (11).
Rockwell Armature Speed Rear Disc Brakes
Caliper, Disc, And Parking Brake Installation
1. If removed, install adapter (2, Figure 6-3) and
secure in place with capscrews and flatwashers
(1). Tighten capscrews to standard torque.
2. Install adapter (9) on armature shaft drive (20)
and secure in place with capscrews and flatwash-
ers (7). Tighten hex head capscrews (7) to stan-
dard torque. Tighten 12 point head capscrews (7)
to 212 ± 20 ft.lbs (287 ±27 N.m) torque.
3. Install disc (19) with four equally spaced cap-
screws. Tighten capscrews, but do not tighten to
final torque at this time.
4. Measure and record distance from inner caliper
mount surface to inside face of inner brake disc
(19), (Dimension "A", Figure 6-3).
NOTE: All measurements in the following references
are inches, unless otherwise stated.
5. Subtract dimension "A" from 4.375 in (11.113
cm). The difference is shim pack thickness to be
placed between inner disc (19) and disc adapter
(9).
6. Select shim pack as follows:
Example: If result found in Step 5 is 0.051", then
0.051 is between 0.045 - 0.055 in Shim Pack
Chart. This range indicates one 0.010 in. shim
and one 0.040 in. shim is required to provide cor-
rect shim pack thickness.
7. Remove disc mounting capscrews (12) and disc
(19).
8. Install two 7/8 UNC - 16 in. studs in the two cen-
ter caliper mounting capscrew holes for caliper
(18).
9. Install inner brake caliper half (18).
10. Install shim pack, determined in Step 5, on inner
disc adapter (9) and install inner disc (19) and
bushing (10).
11. Install capscrews and flatwashers (12). Tighten
capscrews (12) to standard torque.
12. Install outer half of caliper (18) and the outer two
capscrews and flatwashers (17).
13. Remove studs, install center two capscrews.
Tighten all capscrews (17) to 580 ft.lbs. (786
N.m) torque.
14. Install outer disc adapter (8). Install capscrews
and flat washers (11). Tighten hex head cap-
screws (11) to standard torque. Tighten 12 point
head capscrews (11) to 212 ± 20 ft.lbs (287 ±27
N.m) torque.
J06020