Operation and maintenance manual

Section 165-0015
Brake Assembly - Oil Cooled Disc Brakes
8
SM 2167 Rev 1 10-03
23. Install pressure gauge assembly to brake actuation
port as shown in Fig. 22.
WARNINGS
To prevent personal injury and property
damage, be sure threads are sealed properly
and all gauge assembly components can safely
handle at least 2000 lbf/in
2
(138 bar).
24. Apply 100 lbf/in
2
(7 bar) air pressure to gauge. Back
off jam nuts (4) and tighten adjuster screws (6) until
they contact piston (21).
25. Tighten adjuster screws (6) to 10 lbf ft (13.5 Nm),
then back off screws 1.75 turns.
26. Tighten jam nuts (4) to 50 - 75 lbf ft (68 - 102 Nm)
as shown in Fig. 23.
27. Install slack adjuster nuts (2) and tighten to 50 - 75
lbf ft (68 - 102 Nm). Carefully release air pressure.
HYDRAULIC PRESSURE TEST
WARNINGS
To prevent personal injury and property
damage, be sure threads are sealed properly
and all gauge assembly components can safely
handle at least 2000 lbf/in
2
(138 bar).
1. Remove brake pack from truck and place on a
workbench.
2. Using a suitable hydraulic test circuit and pressure
gauge assembly, apply 2000 lbf/in
2
(138 bar) of
hydraulic pressure to the brake actuation port.
3. Shut off pressure at gauge.
4. After stabilizing for 30 seconds, pressure should
remain constant for a minimum of 30 seconds.
5. Repeat this test twice. Carefully release hydraulic
pressure.
6. If brake will not maintain pressure, disassemble to
determine cause.
INSTALLATION
Numbers in parentheses refer to Fig. 24, unless
otherwise stated.
SM - 3109
Fig. 22 - Tightening Slack Adjusters
SM - 3110
Fig. 23 - Tightening Jam Nuts
1. Clean 'O' ring groove in brake assembly (40) and
insert a new 'O' ring (39). Smear new 'O' ring with clean
grease to aid in reassembly.
2. Using suitable lifting equipment, offer brake
assembly (40) up to axle stub and housing (29 & 41)
and seat on register.
3. Insert a brake retaining capscrew (35) through the
brake retaining ring (34) and then offer ring (34) and
capscrew (35) up to and through the brake assembly
(40) and into the axle stub and housing (29 & 41).
4. Insert remainder of capscrews (35) and tighten all to
750 - 830 lbf ft (1017 - 1135 Nm) using a diagonal
pattern.
5. Install remaining oil seal (37) in brake assembly
(40). Ensure that oil seal mounting diameter in brake
assembly (40) is free from dirt and that all edges in
seal mating bore are radiused.
6. Assemble two parts of oil seal (37), i.e. 'O' ring and
metal ring, then fit service tool 15500012 in place on
seal (37) assembly, clamping on metal ring.
7. Fit seal (37) into its bore in brake assembly (40)
using even pressure on service tool 15500012, thus
ensuring that seal is fitted parallel in bore.