Edwards A726-01-805 User manual

A726-01-840
Issue F Original
Instruction Manual
XDS Replacement Tip Seal and Exhaust Valve Kit
Description Item Number
XDS5/10 Replacement Tip Seal Kit A726-01-805

© Edwards Limited 2010. All rights reserved. Page i
Edwards and the Edwards logo are trademarks of Edwards Limited.
Contents
A726-01-840 Issue F
Contents
Section Page
1 Replace the tip seals and exhaust valve ......................................................1
For return of equipment, complete the HS Forms at the end of this manual.
Illustrations
Figure Page
1 Replacing the tip seals pre serial number 037874870 (XDS5) or 037869927 (XDS10) .......................... 3
2 Replacing the tip seals post serial number 037874870 (XDS5) or 037869927 (XDS10) ......................... 4
3 XDS5/10 pump side view ............................................................................................... 5
Associated publications
Publication title Publication number
XDS Dry Pump A726-01-880
gea/0131/11/10

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A726-01-840 Issue F
Page ii © Edwards Limited 2010. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.

© Edwards Limited 2010. All rights reserved. Page 1
Edwards and the Edwards logo are trademarks of Edwards Limited.
Replace the tip seals and exhaust valve
A726-01-840 Issue F
1 Replace the tip seals and exhaust valve
This instruction is applicable to the XDS replacement tip seal and exhaust valve kit (Code Number A726-01-805),
which can be used in any of the XDS5, XDS10, XDS5R, XDS10R, XDS5-C or XDS10-C scroll pumps.
For XDS pumps pre serial number 037874870 (XDS5) or 037869927 (XDS10) refer to Figure 1. For XDS pumps post serial
number 037874870 (XDS5) or 037869927 (XDS10) refer to Figure 2. Replace the components as described below.
1. Switch off the pump, isolate the electrical supply and allow it to cool to a safe temperature. Vent the pump
using the gas ballast control set to position 2.
2. Undo the 4 screws (410) and 4 washers (412) which secure the fan-cowl (113) to the pump-body. Remove the fan-
cowl and the fixed scroll together using a lever in the slot provided to ease it from the motor body as shown in
Figure 3.
For pumps from serial number 066267928 the fan flying lead will need to be disconnected manually. When the scrolls
are a short distance apart, disconnect the fan from the pump body by carefully pulling the connector out of the
housing in the body.
Both tip seals (402) will now be exposed. Dispose of the tip seals in accordance with all local and national safety and
environmental requirements. If the pump has been used for anything other than clean applications, go to Step 3; if
not move straight on to Step 14.
3. Remove the gas ballast knob (if fitted) by turning to position II, pressing down and turning anti clockwise.
Remove the gas ballast knob spring (if fitted). Remove the 3 screws (130) and clamping plates (115) which clamp
the fixed scroll (101) to the fan cowl (113). Separate the fan cowl from the fixed scroll.
For XDS pumps pre serial number 037874870 (XDS5) or 037869927 (XDS10) read Step 4 to 8and then continue at
Step 13, for XDS pumps post serial number 037874870 (XDS5) or 037869927 (XDS10) continue at Step 9.
4. The exhaust duct (105#) is now exposed on the outside of the fixed scroll. If the pump is an XDS-C, remove the
5 screws (117) and washers (116) securing this, and lift the exhaust duct (105#) away from the fixed scroll. If the
pump is an XDS, remove the 7 screws (117) and washers (116) securing this, and lift the exhaust duct (105#)
away from the fixed scroll.
5. Remove the O-ring (121#), valve pad (109) and spring (124). Dispose of these items in accordance with all local
and national safety and environmental requirements.
6. Separate the exhaust flange (102) from the exhaust duct (105#), exposing the exhaust duct O-ring. If you have
an XDS pump, these components are plastic and the O-ring is 128. On an XDS-C pump they are stainless steel,
and the O-ring is 137 (not illustrated). O-ring 128 is smaller than O-ring 137. Replace this O-ring and dispose of
the old one. Reconnect the exhaust flange (102) and exhaust duct (105#).
7. Fit the O-ring (121#) into the O-ring groove around the exhaust hole. Fit the exhaust spring (124) over the back
of the valve pad (109). Seat the exhaust valve pad (109) back into the hole on the fixed scroll, so that the spring
stands perpendicular to the scroll.
8. Replace the exhaust ducting, taking care not to dislodge the exhaust valve and spring. Replace the 7 screws
(117) and washers (116). Go to Step 13.
9. The exhaust cover (105*) is now exposed on the outside of the fixed scroll. Remove the 3 screws (117) and
washers (116) securing this, and lift the exhaust cover away from the fixed scroll.
10.Remove the O-ring (121*), valve pad (109) and spring (124). Dispose of these items in accordance with all local
and national safety and environmental requirements.
11.Fit the replacement O-ring (121*) into the groove on exhaust cover (105*). Fit the exhaust spring (124) over the
back of the valve pad (109). Fit the assembled exhaust pad (109) and exhaust spring (124) onto the exhaust
cover’s (105*) spigot.
12.Replace this assembly back into the fixed scroll taking care to align the pad centrally. Whilst applying light
pressure to the back of the exhaust cover, replace the 3 screws (117) and washers (116).

A726-01-840 Issue F
Page 2 © Edwards Limited 2010. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Replace the tip seals and exhaust valve
13.Place the fixed scroll back into the fan cowl (113). Ensure that the 4 screws are aligned with the clearance holes
in the fixed scroll.
In pumps prior to serial number 066267928 ensure that the fan connector and mounting bracket are fitted correctly,
so that the fan connector is restrained by the bracket when the fixed scroll is in place.
In pumps from serial number 066267928 ensure that the fan flying lead is free to slide in and out of the fan cowl
through the aperture opposite the mating connector in the pump body.
Refit the clamp plates (115) into the cut-outs on the fixed scroll, and refit the screws (130) to secure the fan cowl
(113) on to the fixed scroll (101). Refit the gas ballast knob spring and the gas ballast knob.
14.Make sure that there is no debris visible on the inside of the scrolls, especially in the tip seal groove. Wipe with
a soft, dry, lint-free cloth to remove any dust etc.
15.Take a tip seal (402), and starting at the centre of the scroll, fit it into the slot in the orbiting scroll. This tip seal
is longer than required, so must be cut to the correct length. There should be a gap of 20 mm between the end
of the tip seal and the end of the groove. Make sure that the tip seal is pushed fully home, particularly at the
pinchpoint towards the centre of the scroll.
16.Repeat Step 15, using the remaining tip seal (402) in the fixed scroll (101). Note that there is a mark 20 mm from
the outer end of the fixed scroll tip seal groove indicating the correct place to cut the tip seal.
17.Replace the large O-ring (405) on the perimeter of the motor assembly (300).
18.Offer the fixed scroll to the motor.
In pumps post serial number 066267928 connect the flying lead into the corresponding connector on the pump body.
Ensure that it is pushed fully home, but do not apply excessive force.
Take care that the tip seals do not drop out during assembly. Replace the 4 screws (410) and 4 washers (412) and
tighten.
19.Connect the pump to the electrical supply, and check that the electric fan is running, by feeling for air flow at
the fan cowl. Some period of running-in may be required before optimum performance is reached. Depending on
the application, the vacuum achieved directly following a tip seal replacement may be sufficient for your
requirements.

© Edwards Limited 2010. All rights reserved. Page 3
Edwards and the Edwards logo are trademarks of Edwards Limited.
Replace the tip seals and exhaust valve
A726-01-840 Issue F
Figure 1 - Replacing the tip seals pre serial number 037874870 (XDS5) or 037869927 (XDS10)

A726-01-840 Issue F
Page 4 © Edwards Limited 2010. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Replace the tip seals and exhaust valve
Figure 2 - Replacing the tip seals post serial number 037874870 (XDS5) or 037869927 (XDS10)

© Edwards Limited 2010. All rights reserved. Page 5
Edwards and the Edwards logo are trademarks of Edwards Limited.
Replace the tip seals and exhaust valve
A726-01-840 Issue F
Figure 3 - XDS5/10 pump side view
1. Levering slot

A726-01-840 Issue F
Page 6 © Edwards Limited 2010. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
This page has been intentionally left blank.

Return the equipment or components for service
Before you send your equipment to us for service or for any other reason, you must send us a
completed Declaration of Contamination of Vacuum Equipment and Components – Form HS2. The
HS2 form tells us if any substances found in the equipment are hazardous, which is important for
the safety of our employees and all other people involved in the service of your equipment. The
hazard information also lets us select the correct procedures to service your equipment.
We provide instructions for completing the form in the Declaration of Contamination of Vacuum
equipment and Components – Procedure HS1.
If you are returning a vacuum pump, note the following:
 If a pump is configured to suit the application, make a record of the configuration before
returning the pump. All replacement pumps will be supplied with default factory settings.
 Do not return a pump with accessories fitted. Remove all accessories and retain them for
future use.
 The instruction in the returns procedure to drain all fluids does not apply to the lubricant in
pump oil reservoirs.
Download the latest documents from www.edwardsvacuum.com/HSForms/, follow the procedure in
HS1, fill in the electronic HS2 form, print it, sign it, and return the signed copy to Edwards.
Note: If we do not receive a completed HS2 form, we will not accept the return of the
equipment.
P80081000, Issue A

P800‐80‐000IssueT
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