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6 Maintenance
figures of the last test. This is especially important where the pumped liquid tends to
form a deposit on internal surfaces.
• Inspect foot valves and check valves. A faulty foot or check valve will cause poor
performance. The check valve safeguards against water hammer when the pump
stops.
6.2 Flood-damaged pumps
If the pump is properly sealed at all joints and connected to both suction and discharge,
then it will exclude outside liquid. Therefore, it is only necessary to service the bearings,
stuffing box, and coupling after flood damage.
Perform the following service on a centrifugal pump after a flooded condition:
• Dismantle the frame, and then inspect the bearings for any rusted or badly worn
surfaces. Clean as necessary. If the bearings are free from rust and wear, then
reassemble and relubricate them with one of the recommended lubricants.
Depending on the length of time the pump has remained in the flooded area, it is
unlikely that bearing replacement is necessary. Only replace the bearings if rust or
worn surfaces appear.
• Inspect the stuffing box and clean out any foreign matter that will clog the box. Clean
and thoroughly flush mechanical seals.
• Dismantle and thoroughly clean the couplings. Lubricate the couplings where required
with one of the lubricants recommended by the coupling manufacturer.
6.3 Bearing maintenance
Bearing lubrication schedule
Type of bearing First lubrication,
Grease-
lubricated
bearings
6.3.1 Regrease the grease-lubricated bearings
It is important to lubricate pumps and motors that require regreasing with the proper
grease. See the motor service instructions and nameplate for motor regreasing
information. Pumps are to be regreased using the grease types listed below or approved
equal. Always keep pump and motor properly lubricated.
NOTICE:
Make sure that the grease container, the greasing device, and the fittings are clean.
Failure to do this can result in impurities entering the bearing housing when you regrease
the bearings.
1. With fully enclosed coupling guards, regrease pump while pump is running.
a) With old style open ended guards, stop pump, re-grease, and hand turn shaft
2. Wipe dirt from the grease fittings before greasing.
3. Fill both of the grease cavities through the fittings with the recommended grease. Stop
when grease leaks out at shaft.
28
First lubrication,
assembled pumps
replacement bearings
and replacement
bearing frames
Not applicable,
Hand pack bearings
lubricated before
before pressing on the
shipment
shaft. After bearing
frame assembly, follow
relube instructions to
lube bearings.
before re-starting.
G&L Pumps Series A-C 8300 Base Mounted Centrifugal Pump INSTRUCTION MANUAL
Lubrication interval, pump, polyurea-based grease,
operating hours
• 3600 hours, 2 pole
• 7200 hours, 4 pole
• 50% for severe conditions: dirty, wet and/or
above 100°F (38°C) ambient
• 50% for bearing frame temperature above 180°F
(82°C)
• 75% for lithium-based grease
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