Disassembly; Assembly - Komatsu 830E-AC Shop Manual

Disassembly

1. Remove bleeders (2, Figure 5-3) and end caps
(7 and 8) from each end of each brake caliper
housing (1).
2. Remove linings from the caliper assembly.
NOTE: A shallow container may be necessary to
receive any remaining fluid that will drain from
cavities. Do not reuse fluid.
3. Carefully remove the piston dust shields (10)
from behind the groove lip in the housing and
from the grooved lips on the piston.
4. Mark each piston and corresponding brake cali-
per housing position and pull piston out of the
housing. Do not interchange parts.
5. Remove O-ring seals (12) and backup ring (13)
from the piston cavity using small flat non-
metallic tool having smooth round edges.
6. Refer to Caliper Cleaning and Inspection on the
following page for detailed instructions regard-
ing condition and usability of parts.
J05024 10/06
FIGURE 5-3. BRAKE CALIPER (HALF)

Assembly

When assembling pistons (11, Figure 5-3) into the
housings (1), lubricate all cylinder walls, threads,
seals, piston seal surfaces, etc., with clean C-4
hydraulic oil.
NOTE: Do not allow lubricant to contact dust shields.
Rockwell Wheel Speed Front Disc Brakes
1. Housing
2. Bleeder
3. Crossover Tube
4. T-Fitting
5. Elbow Fitting
6. Retainer Bolt
7. End Cap
8. End Cap
9. Brake Lining
10. Piston Dust Shield
11. Piston
12. Piston O-Ring Seal
13. Backup Ring
14. Brake Mounting Bolt
15. Washer
1. Install new piston seals (12) and backup rings
(13) in housings.
2. With housing lying on mounting face, gently
push each piston past piston seal until seated in
bottom of cavities.
3. Install new or reusable dust shields (10).
4. Install all fittings (4 & 5) and bleeder (2) in cor-
rect position in housings.
®
5. Apply Loctite 271 to threads of cap screw (6).
Install linings (9) and end caps (7 & 8) with bolts
(6) and tighten to 546 N·m (403 ft lbs) torque.
6. Refer to Rear Disc Brakes in this Section and
perform Bench Test before installing caliper.
7. After bench test is performed, refer to Installa-
tion for procedures for installing calipers on
brake adapter.
J5-5