A705-74-880 Issue K
Page 38
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MAINTENANCE
5.9
High-vacuum bearings oil change
CAUTION
A vacuum may remain in the high vacuum bearings oil box. Loosen oil filter plug to equalise pressure before
undoing drain oil-drain plug.
Use the following procedure to change the high-vacuum bearings oil:
(the high vacuum bearings sight-glass components are identical to the gearbox sight-glass
components).
Clean the oil-level sight-glass (6) when you change the gearbox oil. Use the following procedure to clean the sight-
glass.
1. Remove the oil filler-plug (3) and O-ring (2).
2. Place a suitable container under the oil drain-port (12); ensure that the container has sufficient capacity for the
oil in the pump (see
3. Unscrew and remove the oil drain-plug (10) and the O-ring (11) and allow the oil to drain from the high vacuum
bearing oil box. Dispose of the O-ring.
4. Undo and remove the four M5 screws (9) from the sight-glass bezel (8).
5. Remove the bezel (8), O-ring (7), sight-glass (6), O-ring (5) and compression ring (4). Dispose of the O-rings.
6. Clean all of the sight-glass components and the sight-glass recess in the high vacuum bearing oil box (13) with a
soft lint-free cloth. If necessary, use a suitable cleaning solution; if you use a cleaning solution, ensure that all of
the solution is removed before you reassemble the sight-glass.
7. Refit the compression ring (4) in the sight-glass recess in the high vacuum bearing oil box (13).
8. Fit two new O-rings (5 and 7) and the sight-glass (6), then fit the bezel (8) and secure with the four M5 screws
(9).
9. Place a suitable funnel in the oil filler-port (1).
10. If the oil drained from the pump is very discoloured, flush the oil box with new or clean oil two or three times,
until the oil which drains from the gearbox is clean.
11. Wipe clean the oil drain-plug (10), then fit a new O-ring (11) to the drain-plug.
12. Fit the oil drain-plug (10) and O-ring (11) to the oil drain-port (12).
13. Fill the oil box through the funnel, with the correct grade and quantity of oil. Allow the oil to drain into the
reservoir of the oil box and then check the level on the oil sight-glass (refer to
).
14. Remove the funnel and refit the oil filler-plug (3) and O-ring (2) to the oil filler-port (1).
15. Dispose of the used oil safely: refer to
.
WARNING
Ensure that you do not come into contact with the used pump oil. The used oil may be hot and can
cause injury.
WARNING
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.
Summary of Contents for DRYSTAR GV Series
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