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 232 of 528
TM 9-2330-356-14
Figure 4-78. Emergency Relay Valve Installation
(M970 installation shown – Typical of M967,
M967A1, M969, and M969A1 semitrailers,
except for brake interlock connection on
M970 and M970A1).
4-45. Air Reservoirs (Fig. 4-79)
a.
Removal.
(1) Block semitrailer wheels to prevent
movement.
(2) Drain air from reservoir by opening air drain
valves on bottom of both air reservoirs.
(3) If air drain valves are to be replaced, unscrew
and replace with new ones.
(4) If rear reservoir is to be replaced, disconnect
hoses and fittings to emergency relay valve. Relay is
mounted to a nipple on rear reservoir.
(5) Remove air fittings on each end of reservoir.
Remove two mounting bolts on each end of reservoir and
remove reservoir. If rear reservoir is removed, emergency
relay valve will be removed with it. Remove relay valve by
unscrewing from nipple.
b.
Installation.
(1) Install new reservoir, bolt in place and
reconnect fittings. If rear reservoir was replaced, screw
emergency relay valve onto reservoir nipple before
replacing reservoir on frame. Close air drain valves. Refill
with air and check reservoir for leaks.
(2) Check fittings, valve, and air drain valves for
leaks. Tighten if leaks are found.
(3) Remove blocks from semitrailer wheels.
Figure 4-79. Air Reservoirs.
4-46. Pressure Protection Valve (Fig. 4-80)
a.
Test and Adjustment.
(1) Attach air system test gage (table 4-1) to
trailer “Emergency” gladhand with gage closest to trailer.
(2) Attach air supply line to valve end of test
gage. Air supply can be either a tractor or stationary
source.
(3) Pressurize system. Close valve on test gage
when system is full. Note gage reading. Drain secondary
(forward) air reservoir by opening drain valve on bottom of
reservoir. When all air has exhausted from secondary
system, gage should read 75 psi. If pressure is not correct,
adjust pressure protection valve as follows:
(a)
(b)
sure setting.
(c)
setting.
Loosen locknut (4) at base of cap.
Turn cap (5) clockwise to increase pres-
Turn cap counterclockwise to decrease
(4) Repeat step (3) until desired pressure is
obtained, then tighten lock nut.
(5) Remove air system test gage.
4-96
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