ARMY TM 9-2815-256-24
AIR FORCE TO 38G1-96-2
MARINE CORPS TM 2815-24/5
Operate pump at 500 pump rpm wide open throttle (WOT) for ten minutes or until temperature reaches 1100
F to 115°F (43.3°C to 46.1 °C). 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 result.
Back out high idle screw.
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 lubricate graduates.
While operating pump at 875 rpm wide open throttle (WOT), perform the following:
Pressure should be 78 to 80 psi (537.8 to 551.6 kPa)
Observe transfer pump pressure. 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 not over-adjust.
Transfer pump pressure gage must be isolated by shutoff valve at injection pump when checking fuel
delivery and advance movement.
Oil return flow reading should be 225 to 475 cc/min.
Check return oil flow.
Recheck transfer pump pressure. Adjust as necessary.
Check housing pressure for 4 to 8 psi (28-59 kPa).
While operating at 262.5 rpm WOT, set advance trimmer screw for 2 degrees.
While operating at 875 rpm WOT, set roller-to-roller fuel delivery to 95.5 to 96.5 mm3/stroke.
Turn speed droop adjusting cap clockwise two full turns.
While operating at 935 rpm WOT, adjust high idle screw to obtain 10 to 12 mm3/stroke.
Check for minimum fuel delivery (32 mm3/stroke) at 75 rpm pump speed.
Operate at 935 rpm pump speed and adjust high idle screw to obtain 10 to 12 mm3/stroke delivery. Recheck
transfer pump pressure upon completion of this adjustment.