S900-01-880 Issue C
Page 40 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.3 Maintenance plan
Table 16 details the maintenance operations necessary to maintain the booster pumps in normal use. We recommend
that you change the oil more frequently if the booster pump is used under severe operating conditions, such as
contamination within the vacuum system or excessively high operating temperatures within the booster pump. (The
operating conditions will determine the frequency of oil changes.) Worn pulleys and over tensioning shortens belt life
by as much as 50%. If wear allows the belts to contact the bottom of the pulley, slippage and belt burn may result.
Convex wear on the side of the belts indicates pulley groove wear. Alignment problems are identified by significant
wear on one side of a belt only.
5.4 General maintenance
Refer to Sections 3.1 and 4 before you shut down the booster pump for maintenance, and restart the booster pump
after maintenance. Only allow suitably trained and supervised technicians to maintain the booster pump.
5.5 Oil-level checks
Ensure that you use the proper grade of oil and that the oil levels in the pump are correct. If you do not, pump
performance will be affected and the pump may be damaged.
Look at the sight-glasses (see Figures 1 and 2). The oil level in each reservoir should be in the centre position on the
sight-glass. If you need to add oil:
1. Shut down the vacuum system and vent it to atmospheric pressure.
2. Remove the oil filler plug (see Figures 1 and 2).
Table 16 - Maintenance plan
Operation Frequency Procedure
Check the oil levels Daily Check the levels and add oil as required.
Change the oil 2000 hourly Drain the oil from the pump, and clean any
filings from the magnetic drain plug. Refill the
pump with new oil.
Check the coupling condition 2000 hourly Replace the spider if worn.
Check the belts and pulleys 6 monthly Replace the belts or pulleys if worn.
Check the bearing condition 6 monthly Check the endplay. Service if required.
Clean the motor and drive Yearly Remove any dirt to reduce wear and to
promote heat transfer.
Check the timing 2 yearly Retime the booster pump if required. Contact
Edwards for service.
Overhaul the pump 6 yearly * Contact your supplier or Edwards to arrange
for an overhaul of the pump.
* Or as advised by your supplier or Edwards.
Never attempt to add or drain oil while the booster pump is operating. Shut down and lock-out the
booster pump and vent it to atmospheric pressure before you fill the pump with oil, or drain oil
from the pump.
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