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4.
In cold weather operation, the pump will not freeze as long as it is running. However, it may freeze if
it is not drained while standing idle. To drain the pump, remove the drain plug at the bottom of the
pump case and rotate the impeller at least once to assure removal of all the water.
5.
To obtain more capacity or pressure, increase the speed of the engine. To reduce capacity or
pressure, reduce the speed of the engine.
6.
The discharge of a self priming centrifugal pump may be closed briefly without damaging the pump.
However, the water will soon heat up and this can damage to the pump seal.
7.
It is not desirable to run the pump without liquid in the pump case. If the pump must be run in order to
check the operation of the engine, fill the case with sufficient water to keep the rotating seal wet. This
will eliminate damage to the seal and other pump parts.
8.
If the pump has been idle for some time, the impeller may appear to be stuck or locked in place.
This is usually caused by a film of rust or dirt between the impeller and volute. A little extra force on
the crank may break it loose. If not, the pump must be dismantled.
SECTION E: MAINTENANCE RECOMMENDATIONS:
E-1) Seal Lubrication:
A self-feeding lubricator is provided to supply grease to the shaft seal of the pump. The grease cup is empty
when the wing nut, positioned at the outer end of the threaded plunger shaft, recedes to the cap of the
grease cup. To refill the grease cup, rotate the wing nut clockwise as far as it will go, attach a zerk gun to
the zerk fitting, then fill until grease oozes from the relief hole on the side of the cup. For operation, return
the wing nut to the end of the plunger. Never force the plunger into the grease cup as this can cause
seal failures. (See Fig. 1)
A #1 grease is normally recommended. However, where high ambient temperatures are encountered, such
as in direct sunlight, a #2 grease can be used. Use a water resistant, nonfiberous grease. Lithium base
greases are excellent and molydisulphide is acceptable. Normally, the sodium soap base greases are the
only non-water resistant types that are not acceptable for mechanical seal lubrication.
If the pump is inoperative for a long period of time, or appears not to use any grease, remove and clean the
cup thoroughly. Caked grease in the cup can create a problem of non-lubrication to the seal.
FIGURE 1
8
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