Operation and maintenance manual

Section 170-0030
SM 2166 Rev 1 10-03
3
Parking Brake - Actuator
SM - 1853
(12) assembly.
Disassembly
1. Remove bolts (30) from the periphery of actuator
housing (1).
2. Remove bolts (35) from rear cap (31).
3. Press release bolt (34) complete with nut (32) in and
remove plate (36).
4. Place the complete actuator under a press with the
flat plunger side (front side) face down.
10. Screw release bolt (34) fully in, so that springs
(37 & 38) press rear cap (31) against retaining ring (7).
Check if retaining ring (7) is flush in the groove.
11. Apply Loctite 221 on bolts (30) and install bolts in
actuator housing (1). Tighten bolts (30) to a torque of 3
Nm (26 lbf in). The actuator is now ready for use.
REPLACEMENT OF SPRINGS
Numbers in parentheses refer to Fig. 2.
Note: Before and during assembly or disassembly
precautions should be taken to avoid damaging plunger
Fig. 2 - Sectional View of Parking Brake Actuator
Upper Section No Oil Pressure Applied - Lower Section Oil Pressure Applied
29 - Ball
30 - Bolt
31 - Cap
32 - Nut
33 - 'O' Ring
34 - Bolt
35 - Bolt
36 - Plate
37 - Spring
38 - Spring
19 - U-Sit Ring
20 - Grommet
21 - Joining Nipple
22 - Base
23 - Plunger
24 - Bolt
25 - Bearing
26 - Retaining Ring
27 - Washer
28 - U-Cup
10 - Tube
11 - Ball
12 - Plunger
13 - Wiper
14 - Gland
15 - U-Cup
16 - 'O' Ring
17 - 'O' Ring
18 - Retaining Ring
1 - Actuator Housing
2 - Lockwasher
3 - Nut
4 - Bolt
5 - Lockwasher
6 - Bolt
7 - Retaining Ring
8 - Rod-End
9 - Seeger Circlip