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 122 of 180

TM 9-6920-430-14
Section VI. CORRECTIVE MAINTENANCE
3-11. GENERAL.
Parts that you can replace on the gas pumping unit (para 3-12) and
battery charger (para 3-27) are called out in the preventive maintenance checks and
services table 3-1 and in the replacement instructions in this section. Apply sealant tape
MIL-T-27730, to all pipe threads. Tape should not be applied to the first two threads that
engage. If maintenance not authorized in this manual is required, return the end item
through normal supply channels for repair. To prepare the gas pumping unit for shipment,
perform the instructions described in chapter 4 of this manual.
3-11.1 PRIMING PROCEDURES.
NOTE
The compressor should be primed only if the compressor fails to build up
pressure after one minute of operation.
a. Stop compressor operation.
b. Close the outlet shut-off valve.
c. Open the access door on the right side of the GPU.
d. Momentarily turn the GPU on, then off while watching the compressor yoke, stop
the GPU when the compressor yoke is at its furthest point from the compressor cylinder
head.
e. Check oil level of reservoir and add oil if required.
f. Tap the oil bowl with your finger and continue to tap until no more air bubbles are
seen rising in the oil bowl.
g. While observing oil in the reservoir, cycle compressor. Continue to cycle
compressor until no air bubbles show in the reservoir. Compressor should now be primed.
h. If output pressure fails to build up, perform steps i, j and k for further priming.
i. Stop the compressor when the yoke is at its furthest point from the compressor
cylinder head.
Do not exceed 30 psi on air applied to oil bowl.
j. Lift cover in the top of the oil bowl and apply a low air pressure to the oil bowl. Be
sure the top of the oil bowl is sealed so the air pressure remains applied.
k. Cycle the compressor to complete the priming. Output pressure should rise
indicating compressor is primed.
3-62
Change 3


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