GRISWOLD PUMP COMPANY Routine and Preventive Maintenance Page 35
Installation, Operation and Maintenance Manual
Griswold Model 811
Griswold Pump Company Routine and Preventive Maintenance Page 37
Never mix greases of different consistencies or different types.
Maintenance and monitoring intervals should be shortened if the pump is applied in especially
severe service such as highly corrosive liquids or applications with measurable amounts of
solids.
Lubrication Topics
All bearings will fail eventually, and the cause is usually a failure of the lubricating medium, not
fatigue. Particular attention needs to be paid to this in order to maximize bearing life. The
standard lubrication for the Model 811 is flood oil. Provisions are made on the pump for use of
regreasable bearings and also for application of oil mist systems.
Listings of suitable oils and greases are shown in the Appendix II, page 42.
With flood oil lubrication, the proper level is at the mid-point of the bull’s-eye sight glass on the
side of the bearing frame. Avoid over-lubrication. It can be just as bad as under-lubrication.
Excess oil will cause a slightly higher HP draw and will generate heat. Any extra heat is not a
good thing. It can also cause frothing of the oil. After the initial start-up of the pump, or after a
bearing change-out, the oil should be changed after 200 hours of operation and every 2000 hours
(or three months) thereafter. If any cloudiness is observed in the oil, it’s indicative of water
greater than 2000 PPM concentration. The oil needs to be changed immediately. The most
common cause of water contamination is condensation.
If the pump is furnished with regreasable bearings, note that the shields must be located toward
the interior of the bearing frame. Bearings should be regreased every 2000 hours of operation or
three months, whichever comes first. When regreasing, be sure that the grease fittings are
absolutely clean. Any contamination will decrease bearing life dramatically. Avoid
overgreasing as this can cause localized high temperatures in the bearing races and create caked
solids which are not good. After regreasing, bearings may run at a slightly higher temperature
for a period of one to four hours. Remove grease plugs (408H) from the bottom of the frame.
Pump grease through the fittings into each bearing cavity until fresh grease comes out of the
relief ports.
Bearing Isolators
The Model 811 pump is furnished with Inpro®
bearing isolators. These labyrinth seals are very
effective at keeping oil in the bearing frame and
keeping contaminants out. For proper operation,
the drain hole needs to be at the bottom (six
o’clock position). This is a non-contacting seal
and, therefore, has a theoretically infinite life.
Due to its close clearances, however, it can be
damaged through an outright bearing failure. Its
rotor is driven by a replaceable o-ring, which fits
CAUTION
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