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4.3 Table Top Oscillates
If the table top oscillates or “hunts”, you may have a set up with a high center
of mass. Refer to the information in Section 3.2 or consult your Newport
representative or Newport Corporation for further assistance.
4.4 System Leaks Air Constantly
All Newport isolators and valves are pressure leak tested prior to shipment.
Check all tubing connections for leaks with soapy water. Tubing that is
crushed out of round or that is not cut squarely may not seal in the push-in
fittings. Use a single edge razor blade to cut the tubing cleanly (refer to
Section 2.3.2). If testing with soapy water indicates that either the isolator or
valve are leaking contact Newport Customer Service.
4.5 Oil Leak From Isolator
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).
4.6 Adding Damping Oil
If the isolator loses damping oil, additional oil may be added as follows:
1. 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.
2. 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.
3. Unscrew the isolator support screw (right-hand thread) and remove the
plate and jack screw from the piston assembly.
4. 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.
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