© Edwards Limited 2009. All rights reserved. Page 33
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MAINTENANCE
A705-74-880 Issue K
Figure 1 shows the locations of the two gearbox oil-level sight-glasses on the pump.
Refer to Figure 10 and check that the pump gearbox oil-level is at the MAX mark on the bezel of the oil-level sight-
glass (10): detail A. If the oil-level is below the MAX mark, replenish using following procedure:
1. Refer to Figure 10. Loosen the oil filler-plug (12) and wait for two or three seconds for the pressure in the
gearbox to equalise before removing together with the O-ring (13) from the oil filler port. Place a suitable
funnel in the oil-filler port, then pour oil through the funnel into the pump gearbox until the oil-level is at the
MAX mark on the bezel of the oil-level sight-glass (see detail A).
2. If you overfill the gearbox: place a suitable container under the oil drain-plug (3); unscrew and remove the
drain-plug (3) and bonded seal (4) and allow oil to drain from the gearbox; when the oil level reaches the MAX
mark on the sight-glass (see detail A), refit and tighten the oil drain-plug (3) and bonded seal (4); continue at
Step 1 again, to check that the oil-level is now correct.
3. Refit the oil filler-plug (12) and O-ring (13) to the oil-filler port (1).
5.4 Checking and filling the high vacuum bearing oil (if necessary)
Purge the pump before shut down. If you do not, process vapours may condense in the pump and corrode or
damage it.
In order to check the gearbox oil level, the pump must be switched off and stationary.
If the high vacuum oil box requires oil frequently, or if there is a sudden loss of a large amount of oil, the pump may
be faulty: shut down the pump and contact your supplier or Edwards.
Figure 1 shows the location of the high vacuum bearings oil-level sight-glass on the pump. Check that the pump high
vacuum bearings oil-level is at the MAX mark on the bezel of the oil-level sight-glass (24): see Figure 11, detail A. If
the oil-level is below the MAX mark replenish using the following procedure.
1. Refer to Figure 11. Remove the oil filler-plug (3) and O-ring (2) from the oil-filler port (1), place a suitable
funnel in the oil-filler port, then pour oil through the funnel into the pump high vacuum bearing oil box until the
oil-level is at the MAX mark on the bezel of the oil-level sight-glass (see Figure 11, detail A).
2. If you overfill the high vacuum bearing oil box: place a suitable container under the oil drain-plug (10); unscrew
and remove the drain-plug (10) and O-ring (11) and allow oil to drain from the gearbox; when the oil level
reaches the MAX mark on the sight-glass, refit and tighten the oil drain-plug (10) and O-ring (11); continue at
Step 1 again, to check that the oil-level is now correct.
3. Refit the oil filler-plug (3) and O-ring (2) to the oil-filler port. As this is a vacuum seal care must be taken to
ensure that the seal is clean and fitted correctly.
5.5 Inspect the gas-ballast system
Use the following procedure to inspect the gas-ballast system. If a nitrogen gas-ballast supply is not connected the
gas-ballast air filter must be replaced every six years as part of the pump overhaul (see Section 5.15). The air filter
will require replacing more frequently if you use the GV pump in an environment where there are excessive air-borne
particulates; refer to Section 7.3 for the Item Number for a new air filter.
Particular caution should be exercised when working with Fomblin oil that may have been exposed
to temperatures above 260°C. Refer to the Edwards Materials Data Sheets for detailed
information.
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