bearing cap. Always clean each grease zerk and relief
tting before lubricating the bearings. This practice
helps prevent foreign material from reaching the
bearings through the grease zerk and ensures the
grease relief tting is not blocked. If the grease relief
tting is blocked, the excessive grease that cannot
be relieved may cause premature seal failure. If you
use a hand grease gun, put the grease in slowly
and stop as soon as the relief tting opens. Grease
the U-joints and the spline of the drive shaft when
greasing the pump.
NOTE: Always use ball bearing grease (MIL-G-10924C)
with a temperature rating of -65°F.
5. Lubricate Motor Bearing:
If lubrication is required, follow the recommendations
of the electric motor manufacturer for the type of
grease to use and the lubrication frequency.
6. Performance Test:
a. While transferring liquid with the pump, check the
pressure at the pump’s inlet port. The pressure drop
in the inlet piping should not be greater than 3 psi.
b. While transferring liquid with the pump, close the
discharge valve(s) so the full ow will be directed
back to the storage tank through the bypass valve.
Then slowly close the valve downstream of the
bypass valves. The discharge pressure of the
pump should increase to the maximum differential
pressure of the pump at no ow conditions (see
Appendix C: Performance Curves).
c. If the maximum differential pressure is not obtained,
the pump must be serviced. See Appendix G
Troubleshooting Guide for additional help.
d. Replace vanes or sideplates if worn.
7. Tighten all holddown bolts.
8. Inspect motor starter contact points.
This must be performed by an authorized and qualied
electrician, based on the electric motors manufacturer’s
guidelines.
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