Instruction manual

Oct 04 Issue H
GV Dry Vacuum Pumps
PAGE
39
39
MAINTENANCE
5.13 Relubricate the motor bearings
5.13.1 General requirements
You must only relubricate the pump-motor bearings
if you have been suitably trained in all of the
procedures required to remove and refit the motor,
to dismantle and reassemble the motor, and to
relubricate the motor bearings.
Take note of the following when you relubricate the
motor bearings:
• Refer to the guidelines given in Section 5.13.2
for the relubrication intervals.
• Use the procedures in this manual to remove
and refit the motor.
• Only use approved procedures to dismantle
and reassemble the motor, and to relubricate
the motor bearings.
WARNING
Do not relubricate the motor
bearings unless you have been
suitably trained in the necessary
procedures. If you are not suitably
trained, you may damage the motor
and it may not operate correctly or
safely.
• We recommend that you use Esso Unirex N3
grease to relubricate 50 Hz motor bearings,
and Chevron SRI No. 2 or Shell Oil Dolium-R
to relubricate the 60 Hz motor bearings.
• Only relubricate the bearings if they are in a
satisfactory condition. Use the amount of
grease shown in Table 13. Do not put too
much grease into the bearings, or the motor
may overheat.
5.13.2 Relubrication intervals
The required interval between motor bearing
relubrication depends on a number of factors, such
as ambient temperature and so on. To determine
the required intervals between relubrication:
• Refer to Table 14 which provides general
guidelines on the required interval between
relubrication.
• Refer also to the nameplate on the motor for
relubrication intervals and grease quantities
specific to that motor.
Note: The data given in Table 14 is for an ambient
temperature of 25
o
C (77
o
F). If the pump is
operated in an ambient temperature of 40
o
C
(104
o
F), the required relubrication intervals
will be 50% of those shown in the table.
Pump
Quantity of grease required
Non-drive end
bearing
Drive end
bearing
GV250, 380/400/415 V, 50 Hz 12 c.c. 12 c.c.
GV250, 230/460 V, 60 Hz 0.2 fluid oz 0.6 fluid oz
GV400, 380/400/415 V, 50 Hz 12 c.c. 12 c.c.
GV400, 230/460 V, 60 Hz 0.4 fluid oz 0.6 fluid oz
Table 13 - Motor relubrication grease required
Pump
Relubrication interval
(hours of operation)
GV250, 380/400/415 V, 50 Hz 7200
GV250, 230/460 V, 60 Hz 4400
GV400, 380/400/415 V, 50 Hz 7200
GV400, 230/460 V, 60 Hz 4400
Table 14 - Motor bearing relubrication intervals