TM 5-4930-218-14
oil-soaked linings, and wear at pivot points. If linings
(4) Remove return springs (1, fig. 4-25).
are worn so that the outside diameter is within 1/16
(5) Remove cap screw (2), nut (3), lock washer (4),
inch of the rivet heads, replace either the linings or
retainer washer (5), and sleeve (6). Remove the
the shoe assemblies. To replace linings, it is
assembled brake shoe and link.
necessary to drill out rivets (33) to remove the old
(6) Disassemble the brake shoe (17) and link (13)
linings. When installing new rivets, start at the cen-
by removing nuts (7 and 14), lock washers (8 and 15),
ter of the shoe and work outward toward the ends of
pins (9 and 16), C-washer (10), plain washer (11), and
the shoe. Linings must fit tightly against the shoe
spring washer (12). Do not remove the brake linings
without any gaps.
(34) unless inspection indicates that they are worn
(3) Inspect the wheel cylinders (42) for cracks,
and must be replaced.
leaking, worn ends, and damaged threads. Replace
(7) Remove the cap screw (18), lock washer (19),
defective wheel cylinders.
flat washer (20), sleeve (21), and fitting (22) that
(4) Inspect the brake link (13) and lever (26) for
secure the remaining brake shoe (35) to the backing
cracks, wear, and distortion, Replace damaged parts.
plate (57). Remove the assembled brake shoe and
(5) Inspect all remaining parts for cracks, distor-
lever (26).
tion, damaged threads, and other damage; replace
(8) Disassemble the brake shoe (35) and lever (26)
defective parts.
by removing nut (23), lock washer (24), pin (25), C-
e. Reassembly and Installation.
washer (27), plain washer (28), and spring washer
(1) Reassembly and installation are essentially
(29). Remove nut (30), lock washer (31), and pin (32)
the reverse of removal and disassembly. Refer to
from the brake shoe (35).
figure 4-2.5. When assembled, make sure the ad-
(9) Remove the wheel cylinders (42) by removing
justing gear (53) engages the star wheel (48) and
fitting bolts (36), gaskets (37 and 38), fitting (39), cap
rotates it properly to provide brake adjustment.
screws (40), and lock washers (41) that secure the
(2) Install the hub and drum (para 4-58) and in-
cylinders to the backing plate (57). Remove covers
stall the wheel and tire (para 4-57).
(43).
(3) Adjust the wheel brakes per subparagraph a
(10) Remove the brake shoe support (50) by
above.
removing cap screws (44 and 46) and lock washer (45).
(4) If the wheel cylinder was removed, it will be
Remove the anchor pin (47) if damaged.
necessary to bleed the brake hydraulic system after
(11) Remove the nut (51), lock washer (52), ad-
reassembly. Refer to subparagraph b above.
justing gear (53), flat washer (54), spring washer (55),
and adjusting stud (56) from the backing plate (57).
d. Cleaning and Inspection.
a. Removal. Note that there are two separate
(1) Wire-brush the brake shoes (17 and 35) to
systems. Disconnect and remove only the lines from
remove all dust and rust. Wipe the exterior of the
the system which requires repair. Instructions are
wheel cylinders with a cloth dampened with dry
given for one system only. You can remove the second
cleaning solvent (fed. spec. P-D-680). Wash all
system in a similar manner.
metallic parts with solvent. Do not saturate the
(1) Remove the manifold-to-wheel cylinder tube
brake linings with solvent.
(1, fig. 4-26) and tube fittings (3).
(2) Inspect the brake shoes for cracks, worn or
