Komatsu 830E-AC Shop Manual page 619

4. Hold the spring compressed and rotate the indi-
cator dial to indicate ZERO.
5. Raise the arbor slowly until the spring tester
force scale reads ZERO; indicator dial reading
will be the BIC (Built-In Clearance).
6. Lower the arbor slowly until the indicator again
reads ZERO; the spring tester force scale will
now indicate the spring return force.
NOTE: The return spring force should be a minimum
of 113 kg (250 lbs) when the spring is compressed
the maximum amount in the piston subassembly.
Replace the spring if the reading is less than 113 kg
(250 lbs). Refer to piston disassembly elsewhere in
this chapter.
7. Slowly raise and lower the arbor several times
to verify both BIC and spring return force. The
BIC should be between 1.40-1.65 mm (0.055-
0.065 in.). If not in this range, readjust the BIC.
Recheck for the correct BIC, Step 3 through
Step 5 above.
J06025 10/06
Piston Assembly Adjuster Grip Force
1. Inspect the piston assembly adjuster grip force.
2. Provide the special tools. Refer to Figures 6-18
A. Scribe and Mark
1. 6.35 mm (0.25 in.)
2. 9.7 mm (0.38 in.)
3. 15.7 mm (0.62 in.)
4. 19.05 mm (0.75 in.)
5. 25.4 mm (1.00 in.)
6. 33.27 mm (1.31 in.)
7. 50.8 mm (2.00 in.)
8. 57.15 mm (2.25 in.)
9. 58.67 mm (2.31 in.)
Armature Speed Rear Disc Brakes
This is the force required to cause the adjuster
pin to slip in the pair of adjuster grip subassem-
blies.
and 6-19.
FIGURE 6-18. CALIBRATED SPRING POD
10. 65.02 mm (2.56 in.)
11. 82.5 mm (3.25 in.)
12. 85.9 mm (3.38 in.)
13. 92.0 mm (3.62 in.)
14. 114.3 mm (4.5 in.)
15. 139.7 mm (5.50 in.)
16. 173 kg (380 lbs)
17. 362 kg (800 lbs)
Free Length
Free Length
J6-15