Varian SH-110 Instruction Manual page 29

Maintenance
Kits and Service Options
Vacuum Technologies pumps will provide many years of
trouble-free service if the maintenance procedures and
intervals are observed. Cleaning and tip seal replacement
are recommended when pump base pressure has risen to
an unacceptably high level for your application. If your
pump exhibits humming or grinding noises from the bear-
ings, a major overhaul should be done by Vacuum
Technologies or an authorized rebuild center. Advance
exchange pumps are available to minimize downtime.
The parts needed for tip seal replacement on the SH-110
are available in the kit described in Table 6. This kit con-
tains seals and O-rings, and can be obtained from your
Vacuum Technologies dealer.
Table 6 Tip Seal Replacement Kit
Part Description
Number
SH0110TS Replacement
Tip Seal Set
Factory Service
Vacuum Technologies offers rebuilding service at our fac-
tory, or you can obtain advance exchange of complete
SH-110 pumps. The service plans available and their
ordering numbers are given in Table 7.
Table 7 Factory Service Options
Factory Service Plans
Advance Exchange SH-110
Pump
Service/Rebuild SH-110
Cleaning
Exterior
The exterior surfaces of the SH-110 may be cleaned with
alcohol or mild detergents only.
Interior
Run the pump periodically at atmosphere for a minute or
two to flush it out. For more information, see "Cleaning
the Pump" on page 21.
SH-110 Dry Scroll Vacuum Pump
Contents
Replacement Tip
Seals and O-rings for
SH-110 pumps
Model Number
EXSH01101UNIV
RPSH01101UNIV
Tip Seal Replacement
The parts and tools required to replace tip seals are listed
below:
❑
Tip Seal Replacement Kit P/N SH0110TS
❑
4 and 8 mm Allen wrenches
❑
14 mm crescent wrench
❑
Razor blade or side-cutting pliers
❑
Compressed air (optional)
WARNING
If dangerous gases were being pumped,
flush the pump with air or inert gas for
at least 10 minutes prior to disassembly.
Figure 6 on page 24 shows the various components
involved in a tip seal replacement procedure. Refer to
Figure 6 as you follow the procedure.
To remove the worn tip seals:
1. Disconnect the pump from electrical power.
2. Remove (3) M8 socket head bolts (item 1).
3. Using a crescent wrench, remove the exhaust adapter
(item 2).
4. Remove the front cowling and hang out of the way
(item 3). Do not unplug.
5. Remove (4) M5 bolts (item 4).
6. Remove the scroll housing axially off the frame
(item 5).
7. Remove and discard the worn tip seals (item 6) and
the main O-ring (item 7).
8. If compressed air is available, blow any remaining
seal debris off the scroll parts. If seal debris is
attached to the sides, use a razor or Exacto knife to
scrape the debris off.
To install the new seals and O-rings:
1. Unpack the Tip Seal.
2. Install the closed loop portion of the Tip Seal onto the
Orbiting Scroll (item 9).
3. Sequentially insert the seal from center to the outer
edge of the scroll wall.
4. Cut the Tip Seal about 1/8" (3 mm) from the groove
end.
5. Use the remaining Tip Seal material to fill the seal
groove on the Scroll Housing and again trim the
excess Tip Seal so that a gap of about 1/8" (3 mm)
remains.
6. Place the new main O-ring onto the Frame (item 10).
Make sure the area where the O-ring sits is clean.
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