TM 5-4220-211-12&P
b. Check the unit for leaks at all pipe connections, filter, purifier, separator and valves. Tighten couplings and
connections as required.
c. After 10 minutes of operation, open the fill valve and allow the compressed air to escape to the atmosphere.
The compressor will then be maintained at about 2000 PSIG (138 BAR) by the pressure maintaining valve.
d. Shut down the unit after five more minutes of operation and drain off the filter, purifier and separator by
opening their drain valves. Close the valves after compressor has been reduced to zero pressure.
e. Remove top plug (1, Fig. D-13) from purifier chamber. Remove chamber (2, Fig. D-13) from bottom plug (3,
Fig. D-13). Coat threads and "0" ring seals with a thin coat of silicone grease. Install a new purifier cartridge (7, Fig. D-13)
in accordance with paragraph 4-4. Reinstall chamber and top plug.
f.
Service engine oil bath air cleaner (6, Fig. 1-3) in accordance with paragraph 4-5.
g.
Install new compressor inlet air cleaner element (5, Fig. D-10) in accordance with paragraph 4-4.
h.
Remove prefilter hose (15, Fig. D-2). Seal opening in air filter housing with tape, MIL-T-22085.
i.
Drain fuel from fuel tank. Spray interior of tank with a small quantity of preservation oil P-10 grade 30.
j.
Change engine oil in accordance with paragraph 4-5.
k. Change compressor oil in accordance with paragraph 4-4.
l.
Loosen drive belt tension in accordance with paragraph 4-4.
m. Clean dirt and debris from engine cooling fins in accordance with paragraph 4-20.
n. Store in a dry, dust-free room and cover with a plastic film that does not "sweat". Remove cover from time to
time and clean off the unit.
2-5.
LONG TERM STORAGE. Long term storage of the compressor unit, storage without time limit, may be
accomplished only by means of the following special instructions.
a. Run the compressor at operating pressure (open drain valve (13, Fig. D-2) to maintain 3000 PSI on final
pressure gauge (19, Fig. D-2)) and temperature for approximately 10 minutes. All other valves should be closed.
b. Check the unit for leaks at all pipe connections, filter purifier, separator and valves. Tighten couplings and
connections as required.
c. After 10 minutes of operation, open the fill valve and allow the compressed air to escape to the atmosphere.
The compressor will then be maintained at about 2000 PSIG (138 BAR) by the pressure maintaining valve.
d. Shut down the unit after five more minutes of operation and drain off the filter, purifier and separator by
opening their condensate valves. Close the valves after compressor has been reduced to zero pressure.
e.
While still warm, drain compressor crankcase and refill with the proper lubricating oil as specified in Table 2-
1.
f.
While still warm, drain engine crankcase and refill with preservative P-10, grade 10.
g.
Start compressor unit and run under load for about 5 minutes to circulate the proper lubricating oil.
h.
Spray about one fluid ounce of preservative P-9 into the engine air inlet.
i.
Shut down the compressor unit.
2-4
