Operation. - TM-5-4320-234-120017

TM 5-4320-234-12

e. While the pump is in operation, do not

to provide smooth engine operation. When the engine

is warmed up, you must push the choke control all the

completely close off the discharge line. Although no

way in.

serious harm can be done to the pump, the churning of

(7)

Adjust the throttle control (5) to run the

liquid by rotating impeller can generate enough heat to

engine at high idle speed (1200 to 1400 rpm as

cause the liquid to boil in the pump. Make sure that

indicated on the tachometer-hourmeter) for a few

some passage of liquid continues through the pump

minutes to allow the engine to warm up before applying

during operation.

f. If the suction vacuum increases, or the pumping

the pump load.

rate or pressure drops off for no apparent reason, check

2-4. Operation.

the suction line for blockage or closed valves.

g. If the engine stops due to an engine over speed

WARNING

condition, correct the cause of the overspeed and press

the reset button on top the engine overspeed governor

Operation of this equipment presents a

(4, fig. 3-3) to reset the overspeed circuit before

noise hazard to personnel in the area.

attempting to restart the engine.

The noise level exceeds the allowable

h. During operation, check the fuel level gage (1,

limits for unprotected personnel. Wear

fig. 2-3) at intervals. When necessary, shut off the

ear muffs or ear plugs fitted by a trained

engine, remove the filler cap (2) and add gasoline to fill

professional.

a. Open the suction gage valve (3, fig. 2-2) and

the tank.

i. Check the air cleaner restriction indicator (1, fig.

the discharge pressure gage valve (4) to operate the

2-2) at intervals during operation. If the restriction

gages.

b. Push in the throttle control (5, fig. 2-1) all the

indicator shows red, the air cleaner requires servicing.

way and operate the pump at maximum governed

2-5. Stopping

speed. Depending on pumping conditions, the pump

CAUTION

may not start pumping immediately, since it is

necessary for the suction line to fill with water. If after a

Do not stop the engine by pulling out the

reasonable time the pump fails to pump, check the

choke. This floods the cylinders with

suction line carefully for leaks. A small air leak will

raw gasoline, which washes away the

greatly reduce pumping efficiency under any conditions

lubricants and makes the engine

and especially when operating under a high suction lift.

susceptible to wear.

c. After the pump starts pumping, as indicated by

a. If the engine has been running hard, do not stop

a reading on the discharge pressure gage, adjust the

it abruptly. Reduce the engine speed to a high idle for

flow by operating the throttle control on the control panel

several minutes before stopping. This will distribute

to obtain the desired pumping rate.

engine heat, minimizing the danger of valve warpage

d. Check the pump for any unusual or excessive

and other internal damage.

b. Turn ignition switch OFF. Engine should stop

vibration. If excessive vibration is noticed, stop the

pump immediately. Correct or refer the problem to the

immediately.

c. Turn battery disconnect switch (13, fig. 2-1)

next higher level of maintenance. Vibration usually

occurs when the pump or connecting lines are not

OFF. Turn fuel source selector valve (5, fig. 2-2) OFF.

properly supported, alined, or secured.

Section II. OPERATION UNDER UNUSUAL CONDITIONS

2-6. Operation in Extreme Cold

a. Drain the pump. Keep free of ice and snow at

coldest conditions likely to be encountered.

d. Keep the fuel tank filled when the pump is not in

all times when not in use. Cover it when not in use and,

if possible, provide some shelter from the weather.

use. This will prevent moisture from condensing in the

b. Use a hydrometer to ensure that the engine

fuel system. Moisture in the fuel system can freeze and

clog lines, filters, and carburetor jets, preventing fuel

coolant has sufficient antifreeze to prevent freezing at

from reaching the engine.

the lowest temperature expected.

e. Check the specific gravity of the batteries and

c. Refer to the current lubrication order (fig. 3 1) to

make sure that they remain fully charged.

determine the proper grade of engine lubricant for the

2-6