TM 9-2320-272-24-4
5-18. FUEL PUMP SETUP AND CALIBRATION (Contd)
c. Fuel Pump Run-In
NOTE
Ensure all other test stand valves are in the CLOSED position to
prevent leakage. Seat all other test stand valves by opening one
quarter turn and reclosing.
1.
Place test stand (1), bypass valve (10), fuel pressure valve (9), and flow control valve (12) in open
position.
2.
Open fuel pump (3) by turning fuel shutoff valve manual override knob (13) until seated.
CAUTION
Check tachometer drive for clockwise rotation. If rotation is not
clockwise, reverse rotation of drive coupling.
3.
Apply lubricating oil to tachometer drive seal (2).
4.
Place test stand power switch (8) in ON position.
5.
Place test stand fuel heat switch (4) in ON position. Observe that fuel temperature gauge reads
between 90o-100F (32o- 38C) for diesel fuel.
6.
Place selector valve (11) in ROTAMETER position.
7.
Turn range crank (5) to HIGH range position.
NOTE
Perform steps 8 and 9 only on Variable Speed (VS) governor.
8.
Back high-adjusting screw (14), low-adjusting screw (15), and throttle lever (16) out of
VS governor (17) four turns.
9.
Fasten VS governor throttle lever (17) in full fuel position.
CAUTION
Pump must pick up fuel at 500 rpm without priming. If no fluid
pickup is indicated at ROTAMETER, check fuel filter for improper
installation, motor switch for correct rotation, open suction valve
and hose, and that gear pump connections are tight.
10.
Start test stand (1) by depressing start button (8) and run up to 500 rpm. To maintain 500 rpm,
depress and release FAST (7) rotate SLOW (6) button.
NOTE
l Check ROTAMETER for air in fuel flow. If air bubbles are
present, work pump throttle from fuel full-open to idle several
times to relieve entrapped air in pump.
l If air bubbling persists, it is an indication of an air leak in the
system. Turn test stand off and check the line for loose
connections between tank and test stand pump, mating of gear
pump housing, and full fuel supply tank (TM 9-4910-571-12).
l If pump is new or has been disassembled and reassembled, run
pump at 500 rpm for 5 minutes to allow bearings and seals to
seat and to purge air from system.
5-108
