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 TM 55-1925-273-10-1
0090 00
! CAUTION
Never run the pump at high speeds unless it is discharging water. Never run the pump without
water any longer than the short time required for priming. Extended operation without prime
may cause serious damage to the packing gland, the pump shaft, and other pump internals.
9.
After the engine is running, set the engine throttle control to the RUN position.
PRIMING THE PUMP AND COMMENCING PUMPING
To prime the dewatering pump prior to operation of the pump:
NOTE
Start the engine and run at a fast idle to prime with lifts less than 10 feet. Start the engine and run
at full throttle to prime with 10 to 22 foot lifts. When priming on high lifts, or when pumping
dirty water, it may be necessary to seat the discharge stop-check valve by tightening down gently
with the handwheel. Unscrew the handwheel when water is discharged through the exhaust jet.
1.
Shift the engine exhaust valve to the PRIME position, blocking the main exhaust opening.
NOTE
The exhaust valve is in the PRIME position when the handle is horizontal.
2.
When a steady stream of water appears at the discharge of the priming pipe, CLOSE the primer line shutoff valve and
return the engine exhaust valve to the NORMAL position (vertical).
3.
OPEN the pump discharge valve.
! CAUTION
Do not overload the engine. If black smoke appears from the exhaust, reduce the throttle.
4.
Adjust the throttle to get the desired pressure.
5.
If the pump fails to hold its prime, repeat the priming operation.
6.
If the pump still does not deliver water within 2 minutes, stop the engine and check for air leaks at the suction connec-
tions and the pump packing gland.
SECURING THE PUMP
To shut down the dewatering pump:
1.
To STOP the pump unit, reduce the engine speed to idle and allow the engine to cool down for 2 minutes.
2.
Set the engine throttle control (figure 3, item 1) to the STOP position.
3.
If the engine continues to run, CLOSE the fuel tank isolation valve (figure 2, item 1).
4.
To flush the pump with fresh water:
a.
Place the suction hose with foot valve and strainer into fresh water supply.
b.
Run the pump, permitting it to pump the fresh water for at least 1 minute.
0090 00-6
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