TM-9-2330-356-14
SEMITRAILER, TANK: 5000 GALLON, BULK HAUL, SELF LOAD/UNLOAD M967 AND M967A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, AUTOMOTIVE M969 AND M969A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, UNDER/OVERWING AIRCRAFT M970 AND M970A1
TECHNICAL MANUAL; OPERATOR’S, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1990
TM-9-2330-356-14 - Page 228 of 528
TM 9-2330-356-14
(7) Connect brake lines.
(8) Make and hold a full pressure application (fall
air tank and apply service brakes). Hand tighten the collet
nut. With a drift and hammer tighten nut 1½-teeth or
additional 3/16 of a turn. Release service brakes.
(9) Uncage spring in fail-safe unit.
4-40. Brake Chamber-Fail-Safe Unit Test and
Replacement, M967A1, M969A1, and
M970A1 including M970 SN TC-0843,
TC-0844, and TC-103 thru TC-178.
a.
Test.
Perform leakage test (para 4-38). The
fail-safe unit will also be pressurized when the emergeney
line is connected.
b.
Replacement of Fail-Safe Unit.
(1) Manually cage spring in hit-safe unit (para 2-4).
(2)
Release air pressure by opening drain valves on
both air reservoirs (fig. 4-79).
(3) Tag and disconnect brake hoses from brake
chambers and relay valve.
(4)
Remove cotter pin and clevis pin from slack
adjuster and yoke.
(5)
Remove two nuts and washers from fail-safe unit
mounting bolts and remove fail-safe unit from bracket.
(6) Install new fail-safe unit to bracket with two
washers and nuts. Do not tighten nuts. Position ports on the
fail-safe unit to aline with brake hoses. Tighten nuts.
(7) Connect hoses to brake chamber,
(8) Install yoke to adjuster with clevis pin and cotter
pin. Bend back ends of cotter pinto secure.
(9) Manually release spring in fail-safe unit.
(10) Adjust brakes (para 4-34).
c.
Repair of Fail-Safe Unit.
WARNING
DO NOT attempt to repair brake chamber fail-
safe unit. It is dangerous because of high
spring compression. No repair is authorized
for fail-safe unit.
Figure 4-74. Removing Fail-Safe Air Brake Chamber
(M967A1, M969A1, and M970A1 including M970 SN
TC-0843, TC-0844, and TC-103 thru TC-178).
4-41.
Slack Adjuster, M967A1, M969A1, and
M970A1 mcluding M970 SN TC-0843,
TC-0844, andTC-103thruTC-178 (Fig. 4-75).
a.
Removal.
(1) Remove cotter pin and clevis pin securing
yoke to slack adjuster.
(2) Remove retaining ring from end of camshaft.
(3) Using a brass hammer, tap on slack adjuster
lightly until it comes off the camshaft.
b.
Inspection and Repair.
WARNING
Dry cleaning solvent P-D-680 is toxic and
flammable. Always wear protective goggles
and gloves, and use only In a well-ventilated
area. Avoid contact with skin, eyes, and
clothes, and DO NOT breathe vapors. DO
NOT use near open flame or excessive heat.
The solvent’s flash point is 100 “F-138“F
(38°C-59°C). If you become dizzy while
using cleaning solvent, immediately get fresh
4-92
Change 3
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