Maintenance; Kits And Service Options; Cleaning; Tip Seal Replacement - Agilent Technologies SH-112 Bedienungshandbuch

Maintenance

Kits and Service Options

Agilent pumps will provide many years of trouble-free
service if the maintenance procedures and intervals are
observed. Cleaning and tip seal replacement are recom-
mended when pump base pressure has risen to an unac-
ceptably high level for your application. If your pump
exhibits humming or grinding noises from the bearings, a
major overhaul should be done by Agilent or an autho-
rized rebuild center. Advance exchange pumps are avail-
able to minimize downtime.
The parts needed for tip seal replacement on the SH-112
are available in the kit described in Table 6. This kit con-
tains seals and O-rings, and can be obtained from your
Agilent dealer.
Table 6 Tip Seal Replacement Kit
Part Description
Number
SH0112TS Replacement
Tip Seal Set
Factory Service
SH-112 solid tip seals are not inter-
NOTE
changeable with the SH-110 foam
backed tip seal. SH-112 tip seal P/N#
SH0112TS, SH0110TS will work on this
pump.
Agilent offers rebuilding service at our factory, or you can
obtain advance exchange of complete SH-112 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-112
Pump
Service/Rebuild SH-112

Cleaning

Exterior
The exterior surfaces of the SH-112 may be cleaned with
alcohol or mild detergents only.
SH-112 Dry Scroll Vacuum Pump
Contents
Replacement Tip
Seals and O-rings for
SH-112 pumps
Model Number
EXSH01121UNIV
RPSH01121UNIV
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.

Tip Seal Replacement

The parts and tools required to replace tip seals are listed
below:
Tip Seal Replacement Kit P/N SH0112TS
4 and 8 mm Allen wrenches
14 mm crescent wrench
Razor blade or side-cutting pliers
Compressed air (optional)
If dangerous gases were being pumped,
WARNING
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. If a solid 1/8" NPT plug is installed in the gas ballast
port (item 6 in Figure 3 on page 17), remove it to vent
the pump internally.
6. Remove (4) M5 bolts (item 4).
7. Remove the scroll housing axially off the frame
(item 5).
8. Remove and discard the worn tip seals (item 6) and
the main O-ring (item 7).
9. 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 one end of the Tip Seal into the center end of
the groove on the Orbiting Scroll (item 9).
3. Sequentially insert the seal from center to the outer
edge of the scroll wall.
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