TM 5-2420-230-24-1
Spicer Speciality Axle Division - Technical Publications
SECTION 4
REMOVAL OF COMPLETE BRAKE ASSEMBLY
Note :-
Brake assembly can be removed without completely dismantling brake.
4.1
Disconnect brake cylinder push rod from slack adjuster (49) by removing clevis pin split pin and clevis
pin.
4.2
Remove brake cam circlip (52) followed by washer (51) and spring (50).
4.3
Pull slack adjuster (49) from brake cam (23).
4.4
Knock splined end of brake camshaft (23) towards outboard end of axle to release brake cam from
between brake shoe rollers (37), enabling it to be pulled from brake assembly along with brake cam
washer (27) and 'O' ring (28).
4.5
Remove brake cam 'O' ring and washer from brake camshaft (23).
4.6
Remove brake backplate nuts (54) and bolts (62) then, with lifting equipment, pull brake assembly from
axle stub (55).
SECTION 5
BRAKE SHOE REMOVAL
NOTE :- Operations is this section can be carried out with hub assembly in place.
5.1
Chock appropriate wheels.
5.2
Whilst road wheels are still on ground, loosen wheel nuts (1) slightly.
5.3
Jack up vehicle and remove road wheel nuts and road wheels.
5.4
Back off brake adjustment.
5.5
Unscrew and remove brake drum retaining screw (84).
5.6
Support brake drum (2) (approx weight 105 lbs 48 kg), with lifting / handling gear.
Insert two 1/2 " UNF x 1 1/2 " extractor bolts in tapped holes provided in brake drum and tighten to draw
5.7
drum from hub.
5.8
Clean inner face of brake drum (2) with a clean damp cloth.
5.9
Cut, remove and discard lockwire securing two of four brake shoe pivot bush setscrews (65).
5.10
Unscrew and remove two brake shoe pivot bush setscrews (65) and washers (64) from one end of
brake shoe pivot pins (63).
5.11
Repeat operations 5.9 and 5.10 for other two brake shoe pivot bush setscrews and washers (65 & 64)
on other end of brake shoe pivot pins (63).
5.12
Cut, remove and discard lockwire securing two brake shoe pivot pin lockscrews (61).
5.13
Unscrew and remove two brake shoe pivot pin lockscrews (61).
5.14
Using a soft metal drift, drive out in turn two brake shoe pivot pins (63). Care must be taken during this
operation so as not to damage pivot pin setscrew hole thread in end of pivot pin.
5.15
The removal of brake shoe pivot pins (63) reduces brake shoe return spring (24) pressure on brake
shoe assemblies, enabling brake shoe return springs (24) to be unhooked from their
anchor pins (25 & 70).
5.16
The brake shoe assemblies can now be lifted from brake bracket (29).
Page No.D5
Manual No. 1785 Issue A
Spicer Speciality Axle Division
J-97
