21
Oil Leaking From
Isolator
4.5
Adding Damping Oil
Damping oil may leak from the isolator if it is inverted or tilted more than 45
degrees. If more than
1
⁄
8
cup (30ml) of oil is lost, add additional oil (available
from Newport Corporation) as directed in Section 4.6. Losses of less than
1
⁄
8
cup will not affect the isolator performance. Total volume of damping oil per
isolator is approximately
1
⁄
2
cup (125ml).
If the isolator loses damping oil, additional oil may be added as follows:
A. Remove the air pressure from the isolator and allow the piston to
retract. Ensure that the remaining isolators will support the table or
use a jack stand to replace the isolator to be serviced. Loosen the
three bolts securing the support plate to the bottom of the table, and
slide the isolator from under the system.
Warning
The table top is heavy and may cause severe personal injury if it
falls! Be sure it is properly supported before getting underneath
the table top or removing the isolator.
B. Measure the height of the support plate relative to the centering disk
(Figure 2.4). Record this distance so that the isolator may be returned
to its normal position.
C. Unscrew the isolator support screw (right-hand thread) and remove
the plate and jack screw from the piston assembly.
D. Use a funnel to add damping oil through the support shaft hole until
the oil level is approximately
1
⁄
4
" (6.4mm) from the bottom of the
piston. Allow time for the viscous oil to settle before measuring the
oil level.
E. Use a clean, small diameter rod to check the level. When checking
the level, be sure the rod sits on the bottom of the piston and not on
the narrow ledge at the bottom of the support shaft.
F. Reverse Steps B and C to re-assemble the isolator. Return the support
plate to the position noted in Step B.
G. Reinstall the isolator and apply air pressure. Make any required
adjustments to return the system to operation.
Any damping oil that is spilled may be cleaned with a cloth soaked in
mineral spirits. (CAUTION — FLAMMABLE)
4.6
Summary of Contents for IPV
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Page 22: ...16 Figure 13 Double Bolt Tightening Sequence...
Page 32: ...INSTRUCTION MANUAL Vibration Control System...
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