TM 9-2330-356-14
d.
Installation.
(1) Place brake chamber in position on bracket
(2) Install two washers and two nuts to secure
brake chamber to bracket.
(3) Check yoke adjustment (para 4-34).
(4) Install clevis pin and cotter pinto secure yoke
to slack adjuster.
(5) Connect two brake hoses to brake chamber.
(6) Close drain valves on air resevoirs (fig. 4-79).
(7) Pressurize air brake system and check for
leaks.
Brake Chamber--Fail-Safe Test and Re-
placement, M967, M969, and M970 except
M970 SN TC-0843, TC-0844, and TC-103 thru
TC-178.
a.
(M967A1, M969A1, and M970A1 including M970 SN
TC-0843, TC-0844, and TC-103 thru TC-178).
fail-safe unit will also be pressurized when the emergency
line is connected.
CAUTION
Replacement of Fail-Safe Unit.
b.
DO NOT overtighten clamp on air chamber.
Maximum torque should be 20-25 lb.-ft.
(1) Manually cage the spring in the fail-safe unit
Over-tightening will distort the flange and
cause more leakage.
(2) Release air pressure by opening drain valves on
both air reservoirs (fig. 4-79), then disconnect air lines and
(3) If leakage is found at flange, tighten the
tag for identification at installation.
clamp. If leakage is found at connection% tighten fittings.
(3) Tag brake hoses and disconnect them from brake
(4) After initial brake application forces out a
chambers and relay valve.
small amount of air, no air should be expelled from the air
chamber. If air continues to exhaust, replacement of the air
(4) Remove nut and capscrew from clamp ring
chamber is necessary.
which secures fail-safe unit to brake chamber (fig. 4-72).
b.
Removal.
(5) Spread the clamp ring. Hold the diaphragm on
the non-pressure half and remove the fail-safe unit.
(1) Open drain valves on the air reservoirs and
(6) Carefully install new fail-safe unit over diaphragm
allow air to bleed off (fig. 4-79).
on non-pressure housing.
(2) Disconnect two brake hoses from brake
CAUTION
chamber (fig. 4-71).
DO NOT overtighten clamp
(3) Remove cotter pin and clevis pin securing
on air chamber, Maximum
yoke to slack adjuster.
torque should be 20-25 lb.-ft.
Over-thightening will distort
(4) Remove two nuts and two washers securing
the flange and cause leakage.
brake chamber to bracket.
(7) Install clamp ring, with capscrew, nuts, and
(5) Remove brake chamber.
identification tag (fig. 4-72). Position the ports on the
Repair. No repair of brake chamber is authorized.
c.
Change 3
