TM-9-6920-430-14
COOLANT RECHARGING UNIT, TRAINING GUIDED MISSILE SYSTEM M80 AND CHARGER, BATTERY PP-7309/T
TECHNICAL MANUAL; OPERATOR’S AND ORGANIZATIONAL DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL
AUGUST 1980
TM-9-6920-430-14 - Page 138 of 180
TM 9-6920-430-14
3-18. COMPRESSOR ASSEMBLY REPLACEMENT (Figure 3-4)
a. Disconnect the power cable from ac source.
b.
Vent system in accordance with para. 3-16 steps a. through c (page 3-69).
NOTE
If the inlet and outlet hoses are connected they must be removed before
removing the enclosure.
c.
Remove housing enclosure (3) by removing 18 retaining screws (1) from the lower
edge of enclosure and 14 screws (2) from the front panel assembly. Retain securing
hardware for reinstallation and lift enclosure upward to remove. Remove 4 mounting
screws securing safety switch to rear of enclosure and tape safety switch in closed position.
d.
Remove the compressor motor (7), power cable (9) connections, by first removing
the access plate cover (5), then disconnecting the three power leads to the motor terminals
and tag to identify. Remove right-angle connector assembly (4) and retain for reinstallation
on replacement motor.
e.
Using a 9/16-inch open end wrench, remove the inlet (13) and outlet (14) gas line
connections.
f.
Remove retaining bolts (11) and lockwasher (12) from the base of the compressor
assembly using a 1/2-inch socket wrench and retain.
g.
Lift compressor assembly (15) upward to remove from mounting platform. Install
replacement compressor assembly in reverse order of removal, using existing hardware.
h.
Purge system as described in the following steps.
(1) Close INLET SHUTOFF (2), INLET BLEED (l), OUTLET SHUTOFF (7),
and OUTLET BLEED (4) valves fully clockwise. Insure that PROOF TEST SHUTOFF
valve (17) is open.
(2) Connect the gas supply bottle inlet hose to GPU inlet port and check for
leaks around inlet hose in accordance with para. 3-13k and 1 (page 3-65).
(3) Slowly open the INLET SHUTOFF VALVE (2) counterclockwise until
INLET Pressure gage (3) indicates 1000 to 1500 psig; then close INLET SHUTOFF valve
(2) fully clockwise. The OUTLET PRESSURE gage (6) should read the same pressure as
the INLET PRESSURE gage (3). If not, connect the power cable and momentarily press
the ON (8) and OFF (9) pushbutton to obtain positive reading on the OUTLET
PRESSURE gage (6).
NOTE
If pump does not go on, momentarily press the reset switch. Again press the
ON pushbutton.
(4) Squirt leak detecting liquid around all gas line connections opened during
replacement of defective assembly and visually check for gas bubbles indicating leakage. If
a leak occurs, bleed system down in accordance with para. 3-16 (page 3-69) steps
a
and
c
and tighten loose coupling.
(5) Slowly open the INLET SHUTOFF valve (2) two complete turns
counterclockwise.
(6) Press the ON (8) pushbutton to start the pump.
3-76
Change 1
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