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 231 of 528
TM 9-2330-356-14
(4) Install seal and washer, slide camshaft part
way through spider, and install second seal and washer on
camshaft in order shown.
(5) Expand retaining ring and slide over
camshaft. Install camshaft and lock in place with retaining
ring.
c. Repair.
(6) Install slack adjuster (para 4-41).
(7) Install brake shoes (para 4-34).
(8) Install wheels and drum assembly (para 4-49).
(9) Adjust slack adjuster (para 4-34).
(10) Lubricate camshaft (fig. 3-18).
4-43. Service and Emergency Couplings, Air
Lines and Fittings
a.
Test.
(1) Connect air brake hose couplings from
towing vehicle to semitrailer (fig. 2-1). Apply brakes and
coat hose couplings, connectors, and fittings of emergency
and service lines with soap and water solution. No leakage
is permissible.
(2) Check air lines and fittings for restrictions
caused by dents or kinks.
(3) Coupling damage is usually caused by worn,
damaged, or improperly installed packing ring. Install new
packing ring to stop leaks (para 4-43).
b.
Packing Ring Replacement (Fig. 4-77).
(1) Remove packing ring by prying out of
coupling with screwdriver or other suitable tool.
Figure 4-77. Packing Ring Installation.
(2) Clean groove in body. Partially collapse
packing ring with fingers and put one side of packing ring
flange into groove. Use a blunt-ended tool to push ring in
place. The packing ring must lie flat with no twists or
bulges.
(1) Tighten screws holding air line clips.
(2) Tighten fittings if leaks are found. Replace
lines or fittings if leaks cannot be stopped (para 4-48).
4-44. Emergency Relay Valve (Fig. 4-78)
a.
Test.
(1) When the brake pedal or trailer hand brake
lever of the towing vehicle is depressed or applied, air is
delivered through the service line to the emergency relay
valve.
(2) The emergency relay valve releases air from
the primary brake reservoir to the brake chambers to set
the brakes.
(3) Engage the service brake and apply soapy
water to exhaust port on top of the emergency relay valve.
If there is leakage, replace the relay valve.
(4) Apply and release the service brake several
times. Listen for immediate response from the relay valve.
If there is hesitation in brake application and release,
replace the relay valve.
b.
Replacement.
(1) Block semitrailer wheels to prevent move-
ment.
(2) Disconnect towing vehicle and/or air brake
lines and open air drain valves on bottom of both air
resevoirs (fig. 4-79). Leave open while replacing valve.
(3) Tag air lines for identification at assembly.
Disconnect hose and tube fittings from valve. Remove
double check valve and unscrew valve from nipple in
reservoir.
(4) Screw new valve onto nipple. Install double
check valve, and reconnect hose and tube fittings.
(5) Close air drain valves in both reservoirs.
Connect towing vehicle and fill the reservoir.
(6) Test service brakes and parking brakes
(para 4-44).
(7) Remove blocking from semitrailer wheels.
4-95
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