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TM 5-4320-305-10
2-6.
OPERATING PROCEDURE (Continued)
(8)
Check that ALTERNATOR light (10) has gone out. When the ALTERNATOR light is out, alternator
output is greater than the battery voltage, and is adequate to operate the electrical control system and
recharge the batteries.
(9)
After starting the engine, observe TACHOMETER (11). Use SET POINT switch (4) to adjust the
engine to idle speed (approximately 800 to 900 rpm's).
(10) Observe PUMP SUCTION GAGE (12); the gage should show a vacuum. The pump may not prime
immediately because the suction hose must first fill with liquid. If the pump fails to prime within 5
minutes, stop the engine and check for leaks. If there are no leaks, and the pump fails to prime, refer
to Table 3-1, Troubleshooting.
(11) The check valve on the discharge manifold assembly is forced open when discharge pressure indicated
on PUMP DISCHARGE GAGE (13) is high enough to initiate flow.
After centrifugal pump unit is primed and pumping, maintain engine idle speed until engine
warmup cycle is complete.
(12) Run the centrifugal pump unit with engine at idle speed for a few minutes. Adjust SET POINT switch
(4) until desired operating speed is reached. Refer to paragraph g.
(13) Partially close the discharge gate valve (1). The discharge hose will fill slowly to guard against
excessive shock pressure to fittings. As the discharge hose fills, open the discharge gate valve until it
is adjusted to the required discharge flow rate.
2-72
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