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

  TM-9-6920-430-14 - Page 93 of 180

TM
9-6920-430-14
(12) Check for leaks as prescribed in para. 3-8, step a.6.
NOTE
If the pressure reading on the INLET PRESSURE gage (8) is 1000 psig or
less, replace the gas supply bottle.
NOTE
Very small leaks at the cross fitting are acceptable.
(13) If the digital readout device (9) reads between 5400 and 5800, open the
INLET BLEED valve (10) to relieve the pressure down to between 4700 and 5300 psig.
Close the INLET BLEED valve (10) fully clockwise after bleeding to the required pressure.
This must be performed to allow the GPU to operate when the ON pushbutton is pressed.
(14) Push the ON pushbutton (11) on the GPU. The GPU will start operating,
and automatically shut off when a pressure of 5800 to 6200 psig is reached on the digital
readout device. If the pump does not stop in the above range, record pressure reading,
push the OFF pushbutton (12), and perform substeps (a) through (i) below, otherwise
continue with step (15). If the OUTLET PRESSURE gage does not show an increased
pressure reading after one minute of operating, the compressor may have lost its prime.
Turn the GPU off and perform the priming procedures contained in Chapter 3, Section
VI, Corrective Maintenance.
(a) Ensure that the gas supply valve on the supply bottle is closed fully
clockwise.
(b) Verify that INLET BLEED and OUTLET BLEED are closed fully
clockwise,
and INLET SHUTOFF and OUTLET SHUTOFF are open fully
counterclockwise. Open PROOF TEST SHUTOFF valve.
(c) Slowly open INLET BLEED valve 1/4 to 1 turn counterclockwise to
allow pressure to bleed off. The pressure on the pressure gages will slowly bleed down to
500 psig in approximately 2 to 4 minutes. Close the INLET BLEED valve when pressure
has reached 500 psig. Close the OUTLET SHUTOFF valve fully clockwise. Open INLET
BLEED valve counterclockwise until all gas has escaped. Pressure will be bled from the
inlet and outlet hoses. Close INLET BLEED and INLET SHUTOFF valves fully
clockwise.
Change 3
3-33


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