TM 5-4310-335-14
c.
Reservoir Charge Operation.
(1) Close the pressure regulator.
(2) Open air reservoir bypass valve.
(3) Start engine and observe the reservoir pressure gage.
(4) Stop engine when pressure indicated on gage reaches 3000 psi (210.93 kgs per sq cm).
(5) Close air reservoir by-pass valve.
d. Pneumatic System Service From Sphere.
(1) Connect servicing hose assembly to system being serviced, then to compressor air-out
disconnect.
(2) Open reservoir by-pass valve.
(3) Close the discharge line service valve and adjust regulator to required pressure (indicated on the
high or low outlet pressure gage).
(4) Charge pneumatic system being serviced by opening service valve and valve in pneumatic
system being used. Shut system valve when the system has been charged.
(5) Back off the pressure regulator.
(6) Disconnect charging hose assembly and store.
(7) Close air reservoir by-pass valve.
e. Pneumatic System Service By-passing Air Reservoir.
(1) Connect servicing hose assembly to system being serviced, then to compressor air-out
disconnect.
(2) Start engine.
(3) Close the discharge line service valve and adjust regulator to required pressure (indicated on the
high or low outlet pressure gage.
(4) Charge pneumatic system being serviced by opening service valve and valve in pneumatic
system being used. Shut system valve when the system has been charged.
(5) Back off the pressure regulator.
(6) Disconnect charging hose assembly and store.
(7) Stop engine.
WARNING
Confine compressor discharge pressure on low and high pressure within
specified operating limits.
2-9. Stopping Engine
Move on-off toggle switch to OFF to stop engine and compressor operation. Close fuel valve on gasoline filter.
NOTE
If the engine is to stand for a long period drain fuel tank after stopping engine,
then, drain carburetor.
Section IV. OPERATION UNDER UNUSUAL CONDITIONS
2-10. General
This section covers special instructions for the operator for operating and servicing the air compressor cart in
areas where extremes in temperature and humidity and adverse conditions are encountered. These
instructions supplement the instructions supplied for usual operating conditions.
2-11. Operation in Extreme Cold
a. Temperature Range and Problems. In extremely cold temperature (to -25 ) (-32 ), lubrication
F
C
thickens and congeals and fuels refuse to vaporize making starting difficult. Lubricate engine in accordance
with current lubrication order LO 5-2805-257-12.
service fuel filter more frequently than under normal conditions. Start the engine and compressor in extremely
cold temperatures as follows:
(1) Connect the electrical heater in the moisture separator to a 28 vdc power source for 1/2 hour
prior to starting engine. A cannon-type plug on the instrument panel is provided for this connection.
(2) Use Type II gasoline in accordance with MIILG-3056C.
(3) Starting the engine:
(a) Set engine inlet temperature control (15, fig. 2-1). See legend on filter.
(b) Close the pressure regulator (3) and the manual drain valve (7). Open the reservoir by-pass
valve (9).
(c) Open the fuel shutoff valve (17, fig. 2-1) and position the on-off toggle switch (11) to ON.
(d) Move the engine choke lever (13) to CHOKE and the throttle (14) to GOVERN.
(4) Use an external heat generator to preheat the engine and compressor.
(5) Direct heat across the engine crankcase from the muffler side of the engine, then, direct the heat
over the compressor stages and oil sump.
2-5
