ENCORE
®
700 METERING PUMP
Gearbox Lubrication (Refer to Dwg. 440.400.000.010)
The gearbox is filled with approximately two quarts of mineral oil
SAE85W90 gear oil. This lubricant must be replaced annually to realize
optimum performance of the mechanism. The first oil change is recom-
mended after six months of operation. If synthetic oil (AAA5499) is used,
change the oil every three years of operation, with the first oil change
after three months of operation.
NOTE: Do not mix synthetic oil with mineral oil.
To drain and replace the gearbox oil, perform the following steps:
a.
Remove the oil drain plug (33) located at the bottom of the side wall
of the gearbox (toward the stroke control knob). Catch the oil with
an appropriate container.
b.
Let the oil drain completely and flush the gearbox using suitable
detergents.
c.
Apply Teflon tape to the oil drain plug and install it to the gearbox.
d.
Remove the breather cap (44) located at the top of the gearbox cover
and the oil check plug (36) located at the center of the gearbox side
wall (toward the stroke control knob)
e.
Fill the gearbox with oil (SAE85W90) until the oil flows out of the oil
check hole.
f.
Apply Teflon tape to the oil check plug; thread and tighten.
g.
Install the breather cap.
Priming Troubles or Loss of Suction
Difficulties in priming are usually encountered when there is an air leak
in the suction line or when the valves are obstructed. Air leaks in the
suction line may be due to a loose valve, O-ring damage, cracked tub-
ing, or leaking joints in the pipe thread connections. Obstruction on the
valves may be caused by foreign material or by deposits on the pumping
head parts.
Where liquid is withdrawn from containers that are replaced when they
are empty, or if the level in a fixed tank occasionally falls below the suction
line inlet, air will be introduced into the pump. If the pump is discharg-
ing against atmospheric pressure (or only slightly above), the pump may
be expected to reprime itself if the liquid supply is replenished and it is
operated briefly at full stroke. If discharging against greater pressures,
WT.440.400.001.UA.IM.1012
34
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