Komatsu 830E-AC Shop Manual page 628

17. Install the two parking pistons (3, Figure 6-30)
into the parking piston bore of each caliper
housing until fully seated. The smaller diameter
portion of each parking piston is inserted into
the caliper housing bore first, toward the inside
of the caliper housing.
18. Apply graphite-based anti-seize compound to
the tapered surfaces of the adjusting collar.
19. Working from the inside of each caliper housing,
install the parking piston adjusting collar into the
inner bore of each piston. The collar should
conform to the shape of the inner bore of the
parking piston.
FIGURE 6-30. PARKING PISTON
1. O-Ring
2. Backup Ring
J6-24
3. Parking Piston
4. Housing
Armature Speed Rear Disc Brakes
20. Install snap ring (2, Figure 6-31) into the snap
ring groove of each parking piston inner bore to
retain the adjusting collars.
21. Make a short bend in the end of a length of
safety wire. Hook the bent end of the wire into
one of the slots in the adjusting collar to keep it
from turning when the adjusting bolt is installed.
FIGURE 6-31. ADJUSTING COLLAR
1. Adjusting Collar
2. Snap Ring
3. Parking Piston
10/06 J06025