CHAPTER III - OPERATING INSTRUCTIONS

FIGURE 2A RECIPROCATING PUMP SERVICE POINTS AND ENGINE CONTROLS.

CHAPTER III - OPERATING INSTRUCTIONS

12. Normal operation - The operation of the pump is de-

pendent on the volume or supply of liquid to be

pump-ed. When shallow suction lifts with little liquid

10. Starting - Fig. 2A.

to be pumped is encountered, reduce engine speed.

A. Fill engine fuel tank (1.5 gallons). Regular

To govern the engine speed, loosen the spring

motor fuel "Mogas".

loaded knurled knob. Actuate knob forward or back

B. Check engine crankcase oil level. Remove dip

in slotted hole to gain the desired engine speed.

stick. Observe level indicated. Add oil if

This will reduce the load on the engine resulting in

necessary. See Lubrication order TM 5-2805-

reduced fuel consumption. On high suction lifts, it

257-14.

will be necessary to keep the engine speed higher.

C. Check oil level in pump reduction gearcase.

Re-move oil level plug. Oil should be to this

Although the diaphragm pump is self-priming, the

level. Add oil if necessary.

initial prime can be speeded up as outlined under

D. Hand turn down grease cup cap slightly on top

par. 10. Filling the pump body with liquid helps to

of the connecting rod needle bearing to force

seal off the inlet and outlet valves from taking in air.

grease to the bearing.

E. Connect suction hose to pump and place in

13. Cold weather operation - Cold or freezing weather

liquid to be pumped.

should not effect the operation of the pump as long

F. Connect discharge hose and place accordingly.

as water is being drawn into and passed thru the

G. Remove pump body priming cap and fill pump

pump body. However, at the close of pumping op-

body with liquid.

erations, the pump body should be thoroughly

H. Replace priming cap tight on pump body.

drained by removing the pump body and discharge

I. Flip engine "on-off" switch to the "on" position.

valve drain plugs reference, Fig. 7. Leave drain

J. Close choke valve.

plugs out if pump is to be left outside. Replace

K. Start engine with engine starter rope

plugs before starting operation. If hi-solid content

L. Open choke valve slowly to obtain smooth

water has been pumped, remove the clean-out door,

engine operation.

reference, Fig. 7 and flush out pump body with clear

water.

11. Stopping - Fig. 2A - Shut off engine by flipping the

"on-off" switch to "off" position. If pump is to re-

14. Pump body clean-out door - Fig. 3 - A clean-out

main in its present location, engine need only be

door is provided for quick inspection and clean-out.

shut off.

After pumping off muddy, sludge water, or water

containing chemical harmful to rubber, the pump

body should be flushed out with clean water.

Access to the inside of the pump body is made by

removing four wing nuts holding clean-out door to

pump body and remove door, replace door and

rubber gasket. Turn wing nuts down tightly.