Edwards E2M28 User manual

A373-01-840
Issue J
Instruction Manual
E2M28 Rotary Pump Maintenance Kits
Description Item Number
Clean and Overhaul Kit (Hydrocarbon filled pumps) A373-01-131
Blade Kit for E2M28 A373-01-135
Clean and Overhaul Kit (PFPE (Fomblin) filled pumps) A373-01-136

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Contents
A373-01-840 Issue J
Contents
Section Page
1 Introduction ....................................................................................... 1
2 Parts in the clean and overhaul kit ............................................................ 3
3 How to use the clean and overhaul kit ........................................................ 9
4 Parts in the blade kit ........................................................................... 11
5 How to use the blade kits ..................................................................... 13
Appendix A1 Pre O-ring sealed oilbox superceded assemblies ................................... 15
A1.1 2 Parts in the clean and overhaul kit ...............................................................................17
A1.2 4 Parts in the blade kit ................................................................................................18
A1.3 2.1 Sight glass assembly ...............................................................................................18
For return of equipment, complete the HS Forms at the end of this manual.
Illustrations
Figure Page
1 Kit items (HV and LV stators) .......................................................................................... 6
2 Kit items (adaptor and oil box) ........................................................................................ 7
3 Kit items (motor and adaptor plate) .................................................................................. 8
A1 Figure 3 - E2M18/28 Interim oil sight glass assembly .............................................................18
A2 Figure 2 - Kit items (adaptor and oil box) ..........................................................................19
A3 Figure 4 - Kit items (motor and adaptor plate) ....................................................................20
Tables
Table Page
1 Clean and overhaul kit items- hydrocarbon filled pumps ......................................................... 3
2 Clean and overhaul kit items- PFPE filled pumps ................................................................... 4
3 E2M28 blade kit items ..................................................................................................11
A1 Table 1 - Clean and overhaul kit items ..............................................................................17
A2 Table 3 - E2M28 Blade Kit items ......................................................................................18
dcs/7968/04/08

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A373-01-840 Issue J
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Introduction
A373-01-840 Issue J
1Introduction
These instructions apply to the Clean and Overhaul Kits and Blade Kit for Hydrocarbon filled rotary pumps and PFPE
(Fomblin) filled pumps. When ordering or installing these kits care must be taken to ensure that the correct clean
and overhaul kit is used. Due to the more aggressive nature of Fomblin lubricants it is essential that only the Fomblin
kit is only used on PFPE prepared pumps. Failure to do so could result in damage to the pump or cause injury to
people.
The Blade Kit is compatible for use in both Hydrocarbon and PFPE filled pumps.
PFPE (Fomblin) oil has different properties from other pumps, therefore:
zTake additional care if you suspect that the pump (and hence the PFPE oil) has overheated.
zDo not touch or inhale the thermal breakdown products of PFPE oil, which may be present, if the pump has
been heated to 260 °C and above. PFPE oils are safe in normal use but can decompose into very dangerous
substances if they are heated to 260 °C and above. The pump may have overheated if it was misused, if it
malfunctioned, or if it was in a fire. Material Safety Data Sheets for PFPE oils used in the pump are available
on request: contact your supplier or Edwards.
zIf you fill your PFPE-prepared EM pump with Fomblin oil, we recommend that you regularly check for oil
leaks, particularly around the shaft seals.
zIf you detect an oil leak, contact your supplier or Edwards for advice.
CAUTION
Never mix Hydrocarbon and PFPE lubricants.
Never use Hydrocarbon lubricants in a PFPE-prepared pump.
zWe recommend that you use all the items in the Clean and Overhaul Kit when you service the pump,
particularly all rubber components. The items supplied in the kit are listed in Ta b l e 1 and 2. These items are
illustrated in Figure 1 to 3. Instructions for the use of the kit are given in Section 3. Kit items are grouped
and packed in separate bags to aid identification.
zUse a Blade Kit together with a Clean and Overhaul Kit when you must replace rotary pump blades. You must
renew all blade assembly items with those supplied in the Blade Kit. The items supplied in the Blade Kit are
listed in Ta b l e 3 . These items are illustrated in Figure 1. Instructions for the use of the Blade Kit are given in
Section 5.
WARNING
The mass of the pump is 44 kg; Use suitable lifting equipment to move the pump. If you do not,
you can injure yourself or damage the pump.

A373-01-840 Issue J
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Parts in the clean and overhaul kit
A373-01-840 Issue J
2 Parts in the clean and overhaul kit
Note: If you are in doubt about which oil your pump is compatible with, contact your supplier or Edwards for
advice.
Table 1 - Clean and overhaul kit items- hydrocarbon filled pumps
Bag Pack
Reference Item No.
Description
Size (mm) and feature (if applicable)
Length x diameter (x width)
* = inside diameter
(x)= number of coils in a spring
O-ring dimensions relate to I.D. x section
Quantity
supplied
Bag 1 36 Exhaust warning label 1
64 Seal 111 x 29 x 2 (nitrile) 1
66 Oil box gasket 1
Oil box O-ring 194.5 I.D. x 3 sect 1
67 Sight glass gasket 1
Sight glass O-ring 69.5 I.D. x 3 sect 1
102 O-ring 11.1 x 1.6 2
O-ring 14.1 I.D. x 1.6 1
103 O-ring 28.2 x 3.5 (fluoroelastomer) 2
Bag 2 17 Filter seal 28.8 O.D. x 3.2 2
18 Gas ballast filter pad 2
19 Gas ballast gauze 2
38 Felt pad 1
39 Oil filter assembly 1
58 Coupling element 1
91 Inner shaft seal 30 x 40 x 7 (fluoroelastomer) 1
92 Outer shaft Simrit seal 25.0 x 35.0 x 5.8 (fluoroelastomer) 1
93 O-ring 6.6 x 2.4 7
96 O-ring 29.5 x 3.0 1
98 O-ring 44.5 x 3.0 2
99 O-ring 79.5 x 3.0 1
100 O-ring 89.5 x 3.0 1
101 Dowty O-ring 107 x 2.6 1
Bag 3 65 Gasket 1
89 Dowty seal 2BA 1
90 Dowty seal 1
94 Gas ballast O-ring 13.6 x 2.4 (fluoroelastomer) 1
95 Gas ballast O-ring 15.6 x 2.4 (fluoroelastomer) & drain plug 2
97 Inlet O-ring 35.5 x 3.0 1

A373-01-840 Issue J
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Parts in the clean and overhaul kit
Bag 4 21 Gas ballast valve 1
57 Valve pad 3
59 Exhaust spring 28.9 x 14 *(14) 1
61 Valve spring H.V. 30 x 9 *(10) 2
104 O-ring 7.9 x 2.6 (fluoroelastomer) 2
Bag 5 60 Distributor spring 14 x 10.3 *(5) 1
63 Distributor rubber 1
147 Waved washer 1
Table 2 - Clean and overhaul kit items- PFPE filled pumps
Bag Pack
Reference Item No.
Description
Size (mm) and feature (if applicable)
Length x diameter (x width)
* = inside diameter
(x)= number of coils in a spring
O-ring dimensions relate to I.D. x section
Quantity
supplied
Bag 1 36 Exhaust warning label 1
66 Oil box O-ring 194.5 I.D. x 3 sect 1
67 Sight glass ‘O’ ring 69.5 I.D. x 3 sect 1
102 O-ring 14.1 I.D. x 1.6 1
103 O-ring 1.109 I.D. x 0.139 (Viton) 2
Bag 2 17 Filter seal 28.8 O.D. x 3.2 2
18 Gas ballast filter pad 2
19 Gas ballast gauze 2
38 Felt pad 1
39 Oil filter assembly 1
58 Coupling element 1
91 Inner shaft seal 30 x 40 x 7 (fluoroelastomer) 1
92 Outer shaft oil seal 25.0 x 35.0 x 5.8 (Viton) 1
93 O-ring 6.6 x 2.4 (Nitrile) 7
96 O-ring 29.5 x 3.0 (Nitrile) 1
98 O-ring 44.5 x 3.0 (Nitrile) 2
99 O-ring 79.5 x 3.0 (Nitrile) 1
100 O-ring 89.5 x 3.0 (Nitrile) 1
101 Dowty O-ring 107 x 2.6 1
Table 1 - Clean and overhaul kit items- hydrocarbon filled pumps (continued)
Bag Pack
Reference Item No.
Description
Size (mm) and feature (if applicable)
Length x diameter (x width)
* = inside diameter
(x)= number of coils in a spring
O-ring dimensions relate to I.D. x section
Quantity
supplied

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Parts in the clean and overhaul kit
A373-01-840 Issue J
Bag 3 89 Dowty seal 2BA 1
94 Gas ballast O-ring 13.6 x 2.4 (fluoroelastomer) 1
95 Gas ballast O-ring 15.6 x 2.4 (fluoroelastomer) 1
97 Inlet O-ring 35.5 x 3.0 (Nitrile) 1
Bag 4 21 Gas ballast valve 1
57 Valve pad 3
59 Exhaust spring 28.9 x 14 *(14) 1
61 Valve spring H.V. 30 x 9 *(10) 2
104 O-ring 7.9 x 2.6 (fluoroelastomer) 2
Bag 5 60 Distributor spring 14 x 10.3 *(5) 1
63 Distributor rubber 1
147 Waved washer 1
Table 2 - Clean and overhaul kit items- PFPE filled pumps (continued)
Bag Pack
Reference Item No.
Description
Size (mm) and feature (if applicable)
Length x diameter (x width)
* = inside diameter
(x)= number of coils in a spring
O-ring dimensions relate to I.D. x section
Quantity
supplied

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Parts in the clean and overhaul kit
Figure 1 - Kit items (HV and LV stators)

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Parts in the clean and overhaul kit
A373-01-840 Issue J
Figure 2 - Kit items (adaptor and oil box)

A373-01-840 Issue J
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Parts in the clean and overhaul kit
Figure 3 - Kit items (motor and adaptor plate)

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How to use the clean and overhaul kit
A373-01-840 Issue J
3 How to use the clean and overhaul kit
CAUTION
Never mix hydrocarbon and PFPE lubricants.
Never use hydrocarbon lubricants in a PFPE-prepared pump.
Where appropriate, refer to the instruction manual for information about routine maintenance of the pump.
1. Disconnect the rotary pump from the electrical supply and allow it to cool.
2. Drain the oil from the rotary pump. Unscrew the bolts which secure the oil box and remove the oil box.
zFor PFPE (Fomblin) prepared pumps take additional care if you suspect that the pump (and hence the PFPE
oil) has overheated.
zDo not touch or inhale the thermal breakdown products of PFPE oil, which may be present, if the pump has
been heated to 260 °C and above. PFPE oils are safe in normal use but can decompose into very dangerous
substances if they are heated to 260 °C and above. The pump may have overheated if it was misused, if it
malfunctioned, or if it was in a fire. Material Safety Data Sheets for PFPE oil used in the pump are available
on request: contact your supplier or Edwards.
3. Remove any debris from inside the oil box. Clean all surfaces with a suitable cleaning fluid.
4. Dismantle the rotary pump and, referring to Figure 1, 2and 3, replace the relevant components with those in
the Clean and Overhaul Kit. Clean all exposed surfaces encountered during a service with a suitable cleaning
fluid.
zDispose of any components removed from the pump and any contaminated cleaning materials safely and in
accordance with all local and national safety and environmental requirements.
zParticular care must be taken with components and waste oil, which have been contaminated with dangerous
process substances.
zDo not incinerate fluoroelastomer seals and O-rings.
5. Inspect the rotary pump blade assembly for signs of wear. Ensure there is less than 0.15 mm clearance between
each blade and its rotor slot: if the clearance is greater than 0.15 mm, you must replace the blades if you wish
to obtain good vacuum performance. Refer to Section 5 for instructions on the use of the Blade Kit.
6. Re-fit the oil box to the pump. Use the new oil box O-ring from the kit. Fill the rotary pump oil box with the
correct quantity of new oil.
7. The kit contains a warning label (item 36). If this is not already in place, remove the backing strip from the
label. Stick the label on the top of the oil box lid close to the exhaust outlet, see Figure 2.
8. Connect the electrical supply and switch on the rotary pump. Check that the oil level in the sight glass at the
end of the rotary pump drops by 3 to 5 mm when the pump is started. If this does not happen, refer to the rotary
pump instruction manual.
9. Open the gas ballast valve and run the rotary pump for at least one hour.
WARNING
The mass of the pump is 44 kg; Use suitable lifting equipment to move the pump. If you do not,
you can injure yourself or damage the pump.

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Parts in the blade kit
A373-01-840 Issue J
4 Parts in the blade kit
Table 3 - E2M28 blade kit items
Illustration Item Description Quantity
1149 HV blade (2 blade pack) 1
1150 LV blade (2 blade pack) 1
151 Oil pump blade 1
156 Spring 2
157 Pin 2

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How to use the blade kits
A373-01-840 Issue J
5 How to use the blade kits
In addition to the procedure in Section 3, if you must replace the blade assembly items, use the new items from the
appropriate kit as described below:
1. Follow Step 1 to 5in Section 3.
2. Fit new HV and LV blades.
3. Check the clearance between each new blade and its rotor slot is between 0.06 mm and 0.10 mm. If the
clearance is less than 0.06 mm, follow the instructions in Step 4 and 5below to rub the blades down: if the
clearance is correct, continue at Step 6.
4. Remove the new HV blades and the oil pump blade; rub down these blades as described below:
zWhere possible, work out of doors or in a well-ventilated area.
zBefore you rub down the new blades, dampen the surfaces of the blades with pump oil. Keep the blades
moistened with pump oil while you rub down the blades.
zPlace the blades on a flat metal work surface when you rub them down.
zUse a piece of emery paper to rub down the blades; the piece of emery paper must be larger than the blade
to ensure that you obtain an even finish.
zApply an even pressure over all of the blade when you rub it down.
zWhen you have finished, seal all waste (emery paper, old blades and any paper or cloth which you have used
to clean the blades and the work surface) inside a plastic bag. Place this bag inside a second plastic bag; seal
the bag.
zDispose of the waste bag at a licenced waste disposal facility.
5. Refit the new HV and LV blades and check that the clearances are now correct.
6. Remove the blades and fit the springs and pins in the holes. Compress the blade set together and fit it to the
motor slot taking care not to score the blades.
7. Fit the oil pump blade.
8. Continue from Step 6 in Section 3.
WARNING
The blade material contains aramid fibres which could be hazardous to health if inhaled. Obey the
safety precautions when you fit the blades.

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Appendix A1
A373-01-840 Issue J
Appendix A1 Pre O-ring sealed oilbox
superceded assemblies
The following pages have been retained for information purposes only.

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