Operation and maintenance manual

Section 170-0030
Parking Brake - Actuator
SM 2166 Rev 1 10-03
4
WARNING
Springs (37 & 38) have been assembled under
pressure, therefore pressing should be carried
out with the utmost precaution.
5. Press rear cap (31) in approximately 10 mm (0.4 in) by
using a solid plate of approximately 130 mm (5 in)
diameter.
6. Remove retaining ring (7) from groove in actuator
housing (1).
7. Release the pressure slowly allowing rear cap (31) to
be pushed completely out of actuator housing (1) until
springs (37 & 38) are totally released.
8. Remove rear cap (31) and take out springs (37 & 38).
Assembly
Numbers in parentheses refer to Fig. 2.
1. Place new springs (37 & 38) in actuator housing (1).
2. Place rear cap (31) on springs (37 & 38).
3. By using a press and a solid plate of approximately
130 mm (5 in) diameter, press rear cap (31)
approximately 10 mm (0.4 in) under the top rim of
actuator housing (1).
4. Smear groove in actuator housing (1) and retaining
ring (7) with Tectyl 280 or equivalent. Fit retaining ring
(7) in groove in actuator housing (1).
5. Release the pressure on rear cap (31) very slowly.
6. Check if retaining ring is correctly in the groove.
7. By using an M8 threaded rod, with a minimum length
of 130 mm (5 in) and pushing this through bolt
holes in rear cap (31), nut (32) can be pulled into place.
8. Install plate (36) with Tectyl 280 or equivalent,
around bolt (35) hole and inside rim of actuator housing
(1).
9. Install bolts (35) with lockwashers (5) and tighten
bolts (35) to a torque of 25 Nm (18 lbf ft).
10. 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.
INSTALLATION
Numbers in parentheses refer to Fig. 1.
WARNING
To prevent personal injury and property
damage, be sure wheel blocks, blocking
materials and lifting equipment are properly
secured and of adequate capacity to do the job
safely.
1. Remount actuator (9) on cap assembly (13) and
install washers (11) and nuts (10). Tighten nuts (10)
finger tight only at this stage.
WARNING
Do not pressurize actuator until the following
instruction has been carried out. Pressurizing
the actuator beforehand can result in serious
brake damage.
2. Turn adjustment screw (14) on the slack adjuster (3)
in a clockwise direction until the brake pads in calliper
head assembly (2) are tight against the brake disc.
3. Connect hydraulic line to actuator (9). Place the
battery master switch in the 'On' position, start the
engine and pull out parking brake control knob to
extend the actuator.
4. Connect slack adjuster (3) to actuator (9) by
inserting clevis pin (7) through clevis on actuator (9).
Secure clevis pin (7) with cotter pin (8).
5. Align actuator (9) to slack adjuster (3) and torque
nuts (10) to 115 - 136 Nm (85 - 100 lb ft).
6. Loosen bolt (15) at the control arm of slack adjuster
(3) and control strap (12).
7. Position control arm of slack adjuster (3) in fully
released position (forcing it in a direction away from
actuator (9)) by turning adjustment screw (14) on the
slack adjuster (3), until it comes to a positive stop
inside the control strap (12).
8. Tighten bolt (15) at the control arm of slack adjuster
(3) and control strap (12).
Note: Failure to position the slack adjuster against the
internal stop may result in brake drag.
9. Use 1.5mm feeler gauge between brake pads in
calliper head assembly (2) and brake disc. Turn the