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TM 10-4320-256-14&P
2-9. Preparing the Equipment for Operation.
a. Maintenance .
(1) Perform the (B) operation preventive maintenance checks and sevices (Table 2-1).
(2) Refer to the lubrication order (LO 9-2805-257-12) for information on lubricating the engine.
b. Suction Line.
(1) The pump assembly is equipped with a 2-inch (5.08 centimeters) quick disconnect female coupling on
the suction (inlet) side of the pump.
(2) Connect a non-collapsible (rigid wall) hose to the suction side of the pump. Locate the pump assembly
so as to keep the suction line as short as possible. Avoid laying the line over rises which will form
pockets.
NOTE
Do not use a centrifugal pump for suction lifts in excess of 25 feet (7.62 meters). A small
air leak in the suction line may prevent priming of the pump.
(3) Reduction in the pumping capacity becomes noticeable at lifts in excess of 15 feet (4.57 meters) and is
very pronounced at 25 feet (7.62 meters). if the pump is operated at a high suction lift, verify that all
hose connections are air-tight.
c. Discharge Line.
(1) The pump assembly is equipped with a 2-inch (5.08 centimeters) quick-disconnect male coupling (figure
1-1) on the discharge side of the pump.
(2) Connect the collapsible hose to the discharge side of the pump.
d. Grounding. Ground the pump assembly to a ground rod at least 96 in. (243.84 cm). Refer to figure 2-2 and
proceed as follows.
(1) Install coupling (1) on ground rod (2) and install driving stud (3). Ensure driving stud (3) seats against
ground rod (2).
(2) Drive rod (2) into ground until coupling (1) is just above surface of ground.
(3) Remove driving stud (3) and install ground rod (4) in coupling (1) making sure ground rods (2) and (4)
seat against each other.
(4) Install coupling (5) on grounding rod (4).
(5) Install driving stud (3) in coupling (5) and ensure driving stud (3) seats against grounding rod (4).
(6) Drive ground rod (4) into ground until coupling (5) is just above surface.
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