ARMY TM 9-2815-255-24
AIR FORCE TO 38G1-95-2
MARINE CORPS TM 2815-24/4
Compressed air used for cleaning can create airborne particles that may enter the eyes. Pressure
will not exceed 30 psig (207 kPa). Eye protection required.
Under no circumstances should 130 psi (896.4 kPa) transfer pump pressure be exceeded, to
prevent damage to the pump.
TABLE 3-4 lists fuel delivery in cubic millimeters/stroke. Some test benches measure fuel flows
in cubic centimeters (milliliters). To convert from mm3/stroke to CC's, use the following formula:
CC's = (mm3/stroke x No. of strokes)/1000
Operate pump at 250 pump rpm wide open throttle (WOT) for ten minutes. Completely dry pump off using
compressed air. Observe for leaks and correct as necessary.
Never back out low Idle screw or disengagement of throttle lever from guide bushing could
Back out high idle screw.
Refer to TABLE 3-4 for correct sequence of test stand adjustments.
Pressurize transfer pump inlet from 1.5 to 2.5 psi (10.3 to 17 kPa).
Close valve in fuel supply line. With pump running 200 pump rpm, the transfer pump must be capable of
creating a vacuum of at least 18 inches (45.7 cm) of mercury. If it does not, check for air leaks between pump
inlet and shutoff valve or deficiency in transfer pump.
Fill graduates to bleed air from test stand and to wetten graduates.
Check return oil quantity by directing return oil flow into a calibrated container for a given time. Refer to TABLE
34 for allowable quantity and pump rpm at which to make the check.
Under no circumstances should 130 psi (896.4 kPa) transfer pump pressure be exceeded.
Operate pump at specified speeds with wide open throttle (WOT) and observe transfer pump pressure. Pressure
should be 78 to 80 psi (537.8 to 551.6 kPa). To adjust pressure, remove lines to transfer pump inlet connector
and use a 5/32 inch hex key wrench to adjust pressure regulating spring plug. Clockwise adjustment increases
pressure. Do no over-adjust.