Bell & Gossett P15758C Replacing the Bearing Frame Assembly or Pump Shaft - Manual (Page 4)

4
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 the grease container, the greasing device,
and the fittings are clean. Failure to do so 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 before re-starting.
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.
4. If needed, stop pump and wipe off excess grease.
5. Restart pump.
The bearing temperature usually rises after you regrease
due to excess supply of grease. Temperatures return to
normal in about two to four operating hours as the pump
runs and purges the excess grease from the bearings.
Maximum normal bearing housing temperature for
polyurea-based grease is 225°F (107°F) and for lithium-
based grease 180°F (82°C).
Lubricating grease requirements
NOTICE:
• Never mix grease of different consistencies (NLGI
1 or 3 with NLGI 2) or with different thickeners. For
example, never mix lithium-based grease with a
polyurea-based grease. This can result in decreased
performance.
• Remove the bearings and old grease if you need to
change the grease type or consistency. Failure to do
so can result in equipment damage or decreased
performance.
Type of bearing
First lubrication,
assembled pumps
and replacement
bearing frames
First lubrication,
replacement bearings
Lubrication interval, pump,
polyurea-based grease,
operating hours
Grease-lubricated
bearings
Not applicable,
lubricated before
shipment
Hand pack bearings before pressing
on the shaft. After bearing frame
assembly, follow relube instructions
to lube bearings.
• 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
BEARING MAINTENANCE
Bearing lubrication schedule
Specifications – Grease Types
Polyurea-based greases Lithium-based greases, NLGI 2
Pumps built on or after Dec 1, 2014 use Polyurea-based
greases. See date code label and lubrication label on
pump or bearing frame indicating polyurea-base grease
Pumps built before Dec 1, 2014 were built with Lithium-
based greases, NLGI 2, and do not have lubrication label
on pump or bearing frame indicating pump grease type
ExxonMobil Polyrex™ EM Shell Gadus® S2 V100 2 (was Alvania® RL 2)
Chevron SRI NLGI 2 Chevron Multifak® EP 2
Shell Gadus® S5 T100 2 ExxonMobil Unirex™ N2