Polvac Wau Manual

User Manual: Polvac wau-manual

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Vacuum Pumps

Instrumentation

Fittings and Valves

LEYBOLD VACUUM

GA 03.107/10.02

RUVAC WA/WAU
151/251/501/1001/2001
Roots pumps

Cat. No.
117 10/20/30/40/50
117 11/21/31/41/51
118 31/41/51
117 24/34/44
917 10/20/30/40/50
917 11/21/31/41/51

Operating Instructions

Contents

Leybold Service
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Page
...3
...3
...6
...7
...9

1
1.1
1.2
1.3
1.4

Description . . . . . . .
Design and function . .
Standard specification
Technical data . . . . . .
Accessories . . . . . . . .

Transportation and storage . . . . . . . . . . . . 10

3
3.1
3.2
3.3
3.4

Installation and connection . . . . . . . . . . . . 11
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Filling in of the lubricants . . . . . . . . . . . . . . . 11
Electrical connections . . . . . . . . . . . . . . . . . 12
Connection of the flanges . . . . . . . . . . . . . . 14

4
4.1
4.2
4.3
4.4

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Shutdown and storage . . . . . . . . . . . . . . . . . 16
Changing from vertical to horizontal flow . . . 16

5
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9

Maintenance . . . . . . . . . . . . . . . . . . . . . . . 18
Safety information . . . . . . . . . . . . . . . . . . . . 18
Oil change / gear box . . . . . . . . . . . . . . . . . 19
Oil change/shaft seal housing . . . . . . . . . . . 19
Cleaning the fan cowl and the cooling fins . . 20
Cleaning the dirt trap . . . . . . . . . . . . . . . . . . 20
Cleaning the pumping chamber . . . . . . . . . . 20
Cleaning the valve of the pressure
balance line . . . . . . . . . . . . . . . . . . . . . . . . . 21
Exchanging the shaft seals . . . . . . . . . . . . . 22
Leybold service . . . . . . . . . . . . . . . . . . . . . . 24

Troubleshooting . . . . . . . . . . . . . . . . . . . . 26
EEC Manufacturer’s Declaration . . . . . . . .29
Declaration of Conformity . . . . . . . . . . . . .31

If a pump is returned to Leybold, indicate whether the
pump free of substances damaging to health or whether
it is contaminated.
If it is contaminated also indicate the nature of the
hazard. Leybold must return any pumps without a
“Declaration of Contamination” to the sender’s address.

Disposal of waste oil
Under the amended law relating to waste disposal dated
November 1, 1986 (valid in the Federal Republic of
Germany) the disposal of used oil is subject to new
provisions. According to legislation relating to waste
disposal the so-called principle of causality is applied.
Hence, anyone in possession of used oil is responsible
for its proper disposal.
Used oils coming from vacuum pumps must not be
mixed with other substances.
Used oils from vacuum pumps (Leybold-oils on the basis
of mineral oils) having been affected by normal
contamination due to oxygen from the ambient air,
increases in temperature and mechanical wear, must be
disposed of as used oil in accordance with the
regulations.
Used oils from vacuum pumps that have been
contaminated by other substances must be labelled,
stored and disposed of as special waste with reference
to the kind of contamination.
When disposing of used oil please observe the safety
regulations that are valid in your country.
In many countries proof of were the oil has finally been
left is required by Law and often shipping of such
contaminated waste requires permission by the
authorities.
Waste disposal information is available through:

Warning Indicates procedures that must be strictly
observed to prevent hazards to persons.

Bundesamt für Gewerbliche Wirtschaft (BAW)
Frankfurter Str. 29-31
D-65760 Eschborn/Taunus
Phone: +49 (0)6196 4041 – Telex: 415603/04

Caution

Indicates procedures that must strictly be
observed to prevent damage to, or
destruction of the equipment.

Figures
The references to figures, e.g. (1/2) consist of the Fig.
No. and the Item No. in that order.
2

We reserve the right to modify the design and the
specified data. The illustrations are not binding.

Description

1
2

3
4
5
Key to Fig. 1
1 Intake flange
2 Pumping chamber
3 Casing
4 Impeller
5 Discharge flange

Fig. 1 Schematic cross-section of a Roots pump (vertical flow)

Fig. 2 Functional diagram of a Roots pump (vertical flow)

1 Description
1.1 Design and Function
The RUVAC WA and RUVAC WAU are Roots vacuum
pumps which are driven directly by an electric motor.
The WAU types have a pressure balance line between
the discharge and intake flange.
Standard RUVAC pumps are not suited for pumping of
oxygen when the oxygen concentration exceeds that in
the atmosphere.
Before planning to use RUVAC pumps for pumping of
highly aggressive gases, contact us first.

1.1.1 Principle of Operation
Roots pumps – also known as Roots blowers – contain
in their pump casing (1/3) two symmetrical impellers
(1/4) rotating in opposite directions. The impellers have
roughly the cross section of a figure “8” and are
synchronized by a toothed gearing so that they move
past each other and the casing without contact but with
a small clearance.
The principle of operation is explained in Fig. 2.
In impeller positions I and II, the volume in the intake
flange is increased. When the impellers rotate further to
position III, part of the volume is sealed off from the
intake side.

In position IV, this volume is opened to the discharge
side, and gas at backing pressure (higher than the intake
pressure) flows in. The inflowing gas compresses the
gas volume pumped from the intake side. As the
impellers rotate further, the compressed gas is ejected
via the discharge flange.
This process occurs twice per complete revolution of
each of the two impellers.
Due to the non-contacting rotation in the pumping
chamber, Roots pumps can be operated at high speeds
(standard n =3,000 rpm at a mains frequency of 50 Hz).
Thus a relatively high pumping speed is attained with
small pumps.
The pressure differential and compression ratio between
the intake and discharge sides are limited on Roots
pumps. If the allowable pressure differential is exceeded,
the pump overheats.
In practice, the maximum attainable pressure differential
is significant only in the rough vacuum range (p > 10
mbar), whereas for pressures in the fine vacuum range
( p < 1 mbar) the attainable compression ratio is decisive.
RUVAC pumps from the WA/WAU range have been
specifically designed for operation in the rough and fine
vacuum ranges. They are thus either used in connection
with backing pumps or in closed gas cycles. The pump’s
power consumption depends not only on the pumping
3

Description

Key to Fig. 3
1 Gearwheels
2 Bearings
3 Impeller seals
4 Intake port
5 Impellers
6 Shaft seals
7 Oiler

8
9
10
11
12
13
14

Coupling
Motor
Drive shaft
Centrifugal disc lubricator
Discharge port
Connecting pipes
Crane eye

Fig. 3 Longitudinal section of a RUVAC WAU 2001 (vertical flow)

chamber volume and the rotational speed of the pump,
but also on the pressure differential between the
discharge and intake flanges (see Fig. 7).

1.1.2 Design
RUVAC Roots pumps can pump gas in the vertical or
horizontal direction.
Although the pumping chamber of Roots pumps is free
of sealing agents and lubricants, the two gearwheels of
the synchromesh gearing (3/1) and the bearings (3/2) for
the impeller shafts are lubricated with oil. The
gearwheels and bearings of the RUVAC are located in
two side chambers which also contain the oil supply.
These two side chambers are separated from the
pumping chamber by the impeller seals (3/3). During
operation of the pump, the side chambers are evacuated
via the impeller seals.
The bearing chambers are linked to each other by two
passages (3/13). These passages are arranged so that
for either horizontal or vertical flow the pressure will be
equalised between the oil supplies.
4

In both bearing chambers there are integrated oil pumps
to ensure that the bearings and gearwheels receive
sufficient lubricant at all recommended speeds.
The motor of the RUVAC WA/WAU is directly flanged to
the coupling housing. One shaft of the pump is linked to
the shaft of the motor by an elastic coupling (3/8). The
shaft of the other impeller is driven via the synchromesh
gear.
With the standard motors, the RUVAC WA/WAUs can run
on either 50 Hz or 60 Hz power supplies.
The speed is then increased to 3,600 rpm and the
pumping speed increases correspondingly.
For the permissible electrical connection data with
respect to these frequencies, see Section 1.3.
Motors for operation in connection with special supply
voltages or frequencies as well as explosion hazard
protected motors are available upon request.

Description

Key to Fig. 4
1 Pressure balance line
2 Pressure balance valve

Fig. 4 Schematic diagram of a Roots pump with pressure balance line

The feedthrough of the impeller’s shaft between the
evacuated bearing space and the atmosphere is sealed
by means of shaft seals. The shaft seals are immersed in
oil. They are located in a seal housing with a separate oil
reservoir. The oil level in the shaft seal housing can be
checked at oiler (3/7).
RUVAC WA/WAUs are air-cooled. The airflow for cooling
the motor and pump is produced by a fan which sits on
the motor.
An additional blade wheel is located on the coupling for
additional cooling.

1.1.3 Pressure Balance Line
The RUVAC WAU has an integrated pressure balance
line (4/1). It links the discharge and intake flanges via a
pressure balance valve.
If the pressure differential between the flanges is too
large, the valve (4/2) opens. Some of the gas which has
already been pumped then flows back through the line to
the intake flange.
The valve is weight- and spring-loaded so that it works
with both vertical and horizontal flow of the pump.
As a result of this pressure balance line, no additional
devices are needed to protect the pump against
excessive pressure differentials. The RUVAC WAU can
be switched on at atmospheric pressure at the same
time as a backing pump. As a result, the pumping speed
of the pump combination is increased even at high intake
pressures.

1.1.4 Lubricants
The standard RUVAC WA/WAU pumps are ready for
operation with mineral oil.
We recommend the use of our N 62 oil for vacuum
pumps (HE-200 in the USA). Other types of oil are
available upon request.

Caution

WA/WAU pumps running with a filling of
PFPE today no longer meet the world-wide
requirements for semiconductor processes.
For such applications the WS/WSU models
should be preferred.

1.1.5 Flange Connections
The cast flanges on the pump’s body comply with DIN
2501, nominal pressure 6.
The pumps are supplied with different collar flanges:
Pumps with Cat. Nos. beginning with 917... are
equipped with collar flanges corresponding to the ASA
standard. These are intended for the American market
(“US version”).
Pumps with Cat. Nos. beginning with 117... are
equipped with ISO-K collar flanges. This standard can be
applied in all other parts of the world (“Euro version”).

Description

1.2 Standard Specification
RUVAC WA/WAUs are supplied for vertical flow as
standard unless you specifically request horizontal flow.
The shaft seal housing is supplied with a filling of oil.

Pumps with Cat. Nos. beginning with 917... are supplied
with ASA adapter flanges. The ASA flanges are sealed
with a piece of foil. Standard motors in accordance with
the NEMA standard are attached to these pumps (flange
motor T.E.F.C.).

Before the pump is shipped the oil has been drained out.
The quantity of mineral oil needed for running the pump
is supplied in a separate container.

The intake flanges of all pumps contain a wire mesh dirt
trap and have been vented with nitrogen for protection
against corrosion.

Pumps with Cat. Nos. beginning with 117... are supplied
with a sealing disc, a blank flange and an ISO-K collar
flange fitted with the required number of screws. These
pumps are equipped with a standard motor in
accordance with the IEC standard.
The WA models are supplied without a motor, but have
been prepared for operation in connection with a motor
which complies with the IEC standard. The motor flange
is sealed with a cardboard disc. The coupling is included
with the pump.

a7
a8

Table giving the dimensions for RUVAC WA and WAU (“Euro” versions/motor to IEC standard)
Type
WA 151

DN
63 ISO-K

DN12)
65

a
669

a1
400

a2
364

a3
14

a4
180

a5
97

a6
163

a7
50

a8
258

WAU 151
WA/WAU 251

63 ISO-K
63 ISO-K

65
65

669
732

400
405

364
365

14
14

180
214

97
120

163
194

50
50

258
290

65
100
150

835
1050
1275

486
560
800

450
520
740

14
16,5
18

242
303
372

155
180
220

218
262
310

50
50
50

323
430
502

WA/WAU 501
63 ISO-K
WA/WAU 1001 100 IS0-K
WA/WAU2001 160 IS0-K
Type

b71)

h51)

WA 151
WAU 151
WA/WAU 251

250
250
250

280
288
270

215
224
210

280
280
280

240
248
230

175
184
170

24
24
24

305
305
305

300
300
300

160
160
160

280
280
280

180
180
180

306
306
306

360
360
360

330
330
330

WA/WAU 501
WA/WAU 1001

307
372

299
352

229
278

320
370

271
320

201
246

24
24

390
490

340
396

180
211

320
370

194
227

348
414

430
532

370
425

WA/WAU2001
457
518
1) On RUVAC WAU only
2) To DIN 2501, nominal pressure 6

388

460

422

292

635

530

300

460

351

578

753

541

Fig. 5 Dimensional drawing for the RUVAC WA/WAU

Description

1.3 Technical Data
50 Hz operation, SI units, “Euro versions”

RUVAC WA / WAU

151

251

501

1001

2001

m3 x h-1

153

253

505

1000

2050

Maximum pumping speed
at a pumping speed for the backing pump of

m3 x h-1
m3 x h-1

130
40

210
65

450
160

890
250

1850
630

Possible cut-in pressure – RUVAC WA
at a pumping speed for the backing pump of

mbar
m3 x h-1

46
40

31
65

37
160

27
250

22
630

mbar

130

Nominal pumping speed

Maximum allowable pressure differential
in continuous operation 2)
Leak rate, integral

mbar · l · s-1

5 x 10-4

Permissible ambient temperatures

°C

12 – 40

Mains voltage at the motor, 50 Hz

230 / 400

400

Motor power, 50 Hz

0.75

1.1

2.2

4.0

7.5

Nominal speed, 50 HZ

rpm

3000

Max. permissible speed

rpm

3600

Oil filling for gear box
– vertical flow
– horizontal flow

l
l

0.7
0.5

1.0
0.7

2.0
1.2

4.0
2.0

Oil filling for the shaft seal housing
(vertical flow or horizontal flow)

0.7

1.2

1.8

Weight WA / WAU with motor

80 / 84

85 / 89

128 / 133

220 / 225

400 / 406

Connection flanges

63 ISO - K

dB (A)

< 63

< 64

< 67

Protection

Noise level

100 ISO - K 160 ISO - K
< 75

< 80

Cat. Nos.
RUVAC WA
RUVAC WA without motor
RUVAC WAU

117 10

117 20

117 30

117 40

117 50

–

117 24

117 34

117 44

–

117 11

117 21

117 31

117 41

117 51

as per DIN 28 400 ff.
The max. permissible pressure differential applies to ratios of up to 1:10 between roots pumps and backing pumps.
3) at an operating pressure < 10-1 mbar
2)

Description

Pumping speed

RUVAC WA/WAU 2001 with SV = 630 m3 x h-1
RUVAC WA/WAU 1001 with SV = 250 m3 x h-1
RUVAC WA/WAU 501 with SV = 160 m3 x h-1

RUVAC WA/WAU 251 with SV = 65 m3 x h-1
RUVAC WA/WAU 151 with SV = 40 m3 x h-1

Pressure

Fig. 6 Pumping speed characteristics for operation at 50 Hz

Fig. 7 Power consumption of the RUVAC WA/WAU

Sv = pumping speed of the backing pump

US-versions

For US-Versions
Conversion of Units
Conversion factors

Different pressure units
mbar

torr

(millibar)

Different pumping speed units

Inches Hg
vacuum

m3 · h-1

I · s-1

cfm

m3 · h-1 = m3/h

l · s-1 = l/s

(cubic feet per minute)

1 Ib = 0.453 kg

1013

760

0.278

0.589

1 qt = 0.946 l

400

300

18.12

3.60

12.12

1.699

0.472

1 hp = 0.735 kW

133

100

25.98

1 rpm = 1 min-1

29.80

1 inch = 25.4 mm

0.75

29.89

29.92

Example: 1 m3 h-1 = 0.589 cfm
Note: The nominal pumping speed of
a pump at 60 Hz is 20 % higher than at 50 Hz.

Pumping speed

1 atm (atmosphere) = 1013 bar
1 Pa (pascal) = 0.01 bar = 10-2 mbar
1 bar = 1000 mbar

Pressure

60 70
Sv = pumping speed of the backing pump

Fig. 6a Pumping speed characteristics for operation at 60 Hz

(Torr)

Fig. 7a Power consumption of the
RUVAC WA/WAU

US-Versions

Technical Data
60 Hz-operation, English units, „US-Versions“; further technical Data see „Euro-Versions, page 7.

RUVAC WA / WAU

151

251

501

1001

2001

Nominal pumping speed

cfm

108

179

357

707

1449

Maximum pumping speed
at backing pump speed

cfm
cfm

92
28

148
46

318
113

629
177

1308
445

Possible cut-in ressure RUVAC WA
at backing pump speed

Torr
cfm

35
28

23
46

28
113

20
177

16
445

Maximum allowable pressure differential
in continuous operation

Torr

Supply voltage, 60 Hz, 3 phase

V / DC

200/230/460 200/230/460 200/230/460 200/230/460 200/230/460

Motor power

1.5

Ratet rotational speed, 60 Hz

rpm

3600

Oil filling for gear box,
- vertical flow
- horizontal flow

qt
qt

.75
.55

1.10
0.75

2.10
1.30

4.20
2.10

Oil filling for shaft seal housing
for vertical and horizontal flow

.74

1.3

1.9

Weight WA/WAU

lbs

177/185

188/196

283/294

486/497

883/896

ANSI

3“

4“

6“

Connecting flanges
Permissible ambient temperatures

54 - 104

°F

Ref.-No.
RUVAC AS

917 10

917 20

917 30

917 40

917 50

RUVAC WAU

917 11

917 21

917 31

917 41

917 51

Dimensions in inches for RUVAC WA and WAU (US-Versions), see drawing on page 6
Type

DN12)

WA 151
WAU 151

3“ ASA
3“ ASA

65
65

283/4
283/4

153/4
153/4

1411/32
1411/32

73/32
73/32

313/16
313/16

67/16
67/16

131/32
131/32

103/16
103/16

927/32
927/32

111/32
1111/32

WA/WAU 251
WA/WAU 501
WA/WAU 1001

3“ ASA
3“ ASA
4“ ASA

65
65
100

313/16
363/8
423/8

1515/16
191/8
221/16

143/8
1723/32
2016/32

83/8
97/16
1113/16

423/32
63/32
73/32

721/32
819/132
105/16

131/32
131/32
131/32

117/16
1223/32
1615/16

927/32
123/32
1421/32

105/8
1125/32
137/8

WA/WAU 2001

6“ ASA

150

523/4

311/2

295/32

17/
32
17/
32
17/
32
17/
32
21/
32
11/
16

1417/32

821/32

127/32

131/32

1925/32

201/4

Type
WA 151
WAU 151

b2
815/32
813/16

WA/WAU 251
WA/WAU 501
WA/WAU 1001
WA/WAU2001
1)
2)

b3
11

b4
97/16

b5
629/32

89/32
9

11
11
1219/32

925/32
91/16
1021/32

1031/32
153/8

149/16
181/8

1219/32
1615/32

for RUVAC WAU only
according to DIN 2501, ND 6 (in metric system)

b6
15/

71/4
611/16
729/32

15/

911/16
1111/32

15/

b71)
12

h
1113/16

h1
65/16

h2
111/32

h3
73/32

h4
121/16

h51)
143/16

h6
13

12
12
1511/32

1113/16
1113/16
133/8

65/16
65/16
73/32

111/32
111/32
1219/32

73/32
73/32
75/8

121/16
121/16
1323/32

143/16
143/16
1615/16

13
13
149/16

195/16
25

1519/32
207/8

85/16
1113/16

149/16
181/8

815/16
1313/16

165/16
223/4

2015/16
2921/32

163/4
215/16

Description

1.4 Accessories
Cat.-No.
Set of gaskets
WA/WAU 151/251
WA/WAU 501 . . .
WA/WAU 1001 . .
WA/WAU 2001 . .

.
.
.
.

.194
.194
.194
.194

60
64
68
72

Oil pressure switches . . . . . . . . . . . . . . . . . . .194 82
(for WA/WAU 1001/2001 only)
Oil drain facility (M 16 x 1,5)
– with straight drain coupling . . . . . . . . . . . . . . .190 02
– with right-angled drain coupling . . . . . . . .200 14 271
Diaphragm pressure switch SM 42
0,5 to 6 mbar . . . . . . . . . . . . . . . . . . . . . . . . . .164 05
5 to 50 mbar . . . . . . . . . . . . . . . . . . . . . . . . . . .164 06
40 to 400 mbar . . . . . . . . . . . . . . . . . . . . . . . . .164 07
Accessories for mounting SM 42
Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .168
Right-angle bend DN 20 KF . . . . . . . . . . . . . . .184
Centering ring DN 20 KF, 2x . . . . . . . . . . . . . . .183
Clamping ring DN 20 KF, 2 x . . . . . . . . . . . . . . .183

39
32
22
42

Pressure switch PS 114 . . . . . . . . . . . . . . . . .160 01
Pressure switch PS 115 . . . . . . . . . . . . . . . . .160 04
Pressure switch PS 112 Ex . . . . . . . . . . . . . .160 91
Accessories for mounting PS 114/115
Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .168
Right-angle bend DN 16 KF . . . . . . . . . . . . . . .184
Centering ring DN 16 KF, 2 x . . . . . . . . . . . . . .183
Clamping ring DN 16 KF, 2x . . . . . . . . . . . . . . .183

40
36
26
41

Contact amplifier SV 110
– 230 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .160 78
OiI N 62*,5l . . . . . . . . . . . . . . . . . . . . . . . . . . . .177 02
Oil HE-200*,1 gal . . . . . . . . . . . . . . . . . . .98-198-007
* N 62 is an oil grade of Leybold Cologne, and HE-200 is
an oil grade of LHVP Export.
They are interchangeable.
For other quantities, see catalogue.

Transportation and Storage

2 Transportation and Storage
Roots pumps are heavy machines (> 70 kg) made of
cast iron and thus should only be lifted using suitable
lifting equipment tied to the crane eye (8/3) provided for
this purpose.

Caution

Before transporting the pump always drain
out the oil from of the bearing spaces (see
Section 5.2). Screw the oil-drain plug with
its gasket back in and wipe any oil droplets
off from the casing.
It will not be required to drain out the oil
from the shaft seal housing (oiler).
The pump should be transported and
stored in a horizontal position (5 ° max. tilt
with respect to its longitudinal axis).
Otherwise there is the danger that oil from
the bearing chambers may enter the pump
chamber, even before the pump is filled with
oil for the first time.

The pump must only be moved and
installed in its horizontal orientation.
Otherwise the oil in the shaft seal housing
(oiler) may spill out.
When shelving the pump for a longer period
of time, the oil should be drained out and
you should seal off the flanges of the pump
with a piece of foil or the cardboard discs
initially supplied with the pump using the
collars. Place a bag with desiccant in the
pump chamber, if required.
The area of the motor (fan and slits at the
flange of the motor) must be protected
against dust and dripping water.

8
9

2
10

Oil level for
horizontal flow

Details of item 2:
Oil-level glass
Oil level for
vertical flow
Fig. 8 Connections and controls; large arrows = direction of flow

Key to Fig. 8
1 Discharge flange
8
2 Oil-level glass
9
3 Crane eye
10
4 Oil-fill port
11
5 Intake flange
12
6 Connection for pressure switch 13
7 Adapter
14

Pressure switch
Centering and clamping ring
Right-angle bend
Oiler
Direction-of-rotation arrow
Junction box
Fan cowl

Installation and Connection

3 Installation and Connection
Caution Only fill in the oil after having installed the
pump.

3.1 Installation
Install RUVAC pumps on a flat, horizontal surface (5°
max. tilt with respect to the longitudinal axis).

Caution

If the pump is tilted by more than 5°,
lubricant may enter the pumping chamber
from the gear chambers.

Keep the air intake and exhaust ducts for cooling the
motor unobstructed (for minimum clearance with respect
to the fan cowl, see Fig. 5).
The pump’s ambient temperature should be between
12 °C and 40 °C. Lower temperatures hamper run-up;
higher ones shorten the oil change intervals and may
lead to greater wear.
Special oil for operation at temperatures below 12 °C is
available upon request.

3.2 Filling in of the
Lubricants
The housing for the shaft seal and the oiler (10/1) are
filled with N 62 oil when the pump is supplied. The oil
level must be visible in the oiler.

Caution

Correct oil level: 1/3 of the oiler must be filled
when the pump is cold. Top up oil as
required.

The lubricant needed for running the pump is supplied in
a separate container.
Unscrew the oil-fill plug (10/8) and add oil.
An oil without additives and of viscosity class ISO VG
100 (formerly SAE 30) must be used for the pump. We
recommend our special oils N 62 or HE-200. Please
consult us if you intend to run the pump with other oils or
special lubricants.
When the pump is not running the correct oil level is:
– for vertical flow of the pump in the center

Secure the pump.
Four holes in the feet are provided for this purpose.

Caution

When bolting the feet down, make certain
that there is no stress or twist on the pump
casing. Stress on the pump can change the
close tolerances between the impellers and
the pump casing and may result in damage
to the pump (use washers to equalise).

Warning Since compensation elements must be
attached to the flanges on the suction and
pressure sides, the screws for attachment
of the feet must always be fitted and
tightened well.
Use the following screws:
RUVAC 151/251/501:
4 x M 12
RUVAC 1001/2001:4 x M 16

– for horizontal flow it is 6 mm above the center of the
oil-level glass (8/2).

Caution

If the oil level is too low, the bearings and
gearwheels are not lubricated adequately; if
it is too high oil may enter the pumping
chamber.
Clean the oil-fill port and screw the plug
back in using a gasket which is in perfect
condition.
The oil-fill port must be sealed air-tight.
Entry of air from the outside may cause oilcontaining gas to enter the pumping
chamber via the impellers seals.

Installation and Connection

3.3 Electrical Connections
Warning Disconnect the mains before doing work on
the wiring.
Electrical connections must be made by a
skilled electrician as defined by VDE 0105
and in accordance with the guidelines of
VDE 0100.
For proper connection, a suitable motor
protection switch must be used. Set the
switch in accordance with the rating on the
motor nameplate.
Connect the pump to the correct mains
voltage through the terminals provided in
the junction box (8/13).
Always provide an uninterrupted connection
for the protective ground conductor
connecting it in a professional manner.
Never leave the protective ground
conductor for the pump unconnected.
Do not link control circuits to the power
circuit of the motor. Observe the wiring
diagram of Fig. 9.

Caution

The WA/WAU pumps are not suitable for
operation in connection with frequency
converters. The max. permissible speed is
3,600 rpm regardless of the size of the
pump.
After connecting the motor and every time
you alter the wiring, check the direction of
rotation.

Warning Wear protective goggles for protection
against particles which may be forced out of
the flange opening. Keep your hands away
from the flange opening.

The impellers should move up from the center and drop
down to the side.
If this is not the case, disconnect the pump from the
mains and interchange two mains phases.
Even if the pump has been already firmly connected to
the piping, you may determine the direction of rotation.
For this, evacuate the vacuum system down to a
pressure below 20 mbar with the aid of the backing
pump. Then switch on the RUVAC briefly; now the
pressure must drop. If the pressure increases or remains
constant, the RUVAC is turning in the wrong direction.
Then rewire as described above.
The RUVAC can be automatically switched on and off via
a contactor using a pressure switch and the contact
amplifier SV 110 (see Section 1.4).
The pressure switches SM 42 or PS 114/115 are set to
a fixed threshold in our factory. Please specify the
switching threshold when ordering.
The contact amplifier is identical for all pressure
switches.

Never allow the pump to run in the wrong
direction or with open flanges for a longer
period of time.

Pressure switches and contact amplifiers with explosion
hazard protection are available upon request.

An arrow (8/12) on the coupling housing shows the
correct direction of rotation for the motor shaft. To check
rotation, switch on the motor briefly and observe the
direction of impeller rotation through the pump’s intake
and then immediately switch off again.

When doing so, ensure proper sealing and air-tight
installation.

After removing a screw plug, the pressure switch (8/8)
together with an adapter (8/7) and a right-angle bend
(8/10) can be mounted on the bore (8/6).

It is advisable to mount the switch vertically to reduce the
entry of contaminants.

Installation and Connection

Low Voltage

High Voltage

NEMA - Motors

Y - Star connection

∆ - Delta connection

Connection to Star/Delta switch

IEC - Motors
Fig. 9 Electrical connection

Installation and Connection

3.4 Connection of the
Flanges
Caution

Already small quantities of liquids (from the
vacuum chamber or the piping) can lead to
liquid damages within the pump. These may
lead to a deformation of the impellers and
may entirely destroy the pump. Suitable
protective measures should be provided as
required in the piping on the suction side
(separator, T-piece).

Warning The RUVAC WA/WAU pumps have not
been designed to pump ignitable or
explosive mixtures without additional
protection.
If the pumps are none-the-less to be used
under such conditions, the customer
himself must ensure that proper measures
for the purpose of protection against
explosions (pressure monitor, flame
arresters etc.) are introduced, in line with
the requirements of the applicable laws.
Consult us for advice.
If not already done, remove the protective shipping
covers, cardboard pieces, foil or packing flanges from the
flanges (8/5) and (8/1).
We recommend that you retain the shipping flanges of
the pumps in case you want to store the pump at a later
date.
Clean the flanges and check that the sealing surfaces
are in perfect condition.
Flange the pump to the vacuum system.

Caution

Don’t place any stress on the pump casing
when installing the intake and discharge
lines.
Fit compensation elements in order to avoid
such stresses.
When attaching the pump directly (without
bolting down the feet) to the forevacuum
pump, you must always use on the pressure
side the full number of screws defined by
the flange standard (ISO-K, DIN or ASA)
whereby these must comply with the
demanded property class rating.
You must also check whether the backing
pump is rigid and stable enough to support
the load of the RUVAC pump in each case.

The dirt-trap which is supplied with the pump should
always be fitted into the intake flange when there is the
possibility of contaminants entering the pump coming
from the vacuum chamber or the piping.
Even with clean vacuum processes, contaminants from
the system may enter upon initial start-up. Depending on
the operating conditions, the dirt trap may reduce the
pumping speed of the pump.
Observe the maintenance information provided in
Section 5.5.

Operation

4 Operation
4.1 Start-up
Check the pump motor’s direction of rotation and the oil
level in the bearing spaces (see Section 3.2 and 3.3).

RUVAC WAU
The RUVAC WAU can be started together with the
backing pump at atmospheric pressure.

With small vacuum vessels, the maximum permissible
pressure differential can be briefly exceeded (max. 3
min) upon start-up. If a pressure switch has been
installed, do not set it to this higher pressure because it
will fail to protect the pump against overload in the event
of a greater gas quantity.
It is advisable to switch the RUVAC WA on and off via a
pressure switch to ensure that it runs only in the
permissible pressure range.

It is protected against excessively high pressure
differentials by a bypass line.

4.2 Operation
RUVAC WA
Do not switch on the RUVAC WA until the backing pump
has evacuated the vacuum vessel to the cut-in pressure
(see Technical Data, Section 1.3).
For processes in which condensable vapours are
pumped, it is advisable to evacuate the vacuum vessel
via a roughing line to the cut-in pressure. Electrically
switch on the Roots pump together with the backing
pump and cut it in upon reaching the cut-in pressure. The
initial bypassing of the Roots pump serves to prevent
condensation of vapours in the cold pump.
The permissible cut-in pressure depends on the ratio
between the Roots pump and the backing pump. It can
be calculated according to the following formula:

pE =
Cut-in pressure
pmax = Maximum permissible pressure differential
(see Technical Data)
Theoretical compression ratio
= nominal pumping speed of Roots pump /
pumping speed of backing pump

Example:
Pump combination:
RUVAC WA 501 / SOGEVAC SV 100
m3

connected the flanges to a vacuum system.
The screws of the flanges on the suction
and the pressure side must not be loosened
in the presence of a vacuum even if the
pump is not running.
During operation of the RUVAC, check the oil level and
the condition of the oil in the oil level glass and the oiler
from time to time. Correct as required (see Section 5.2
and 5.3). Normally, the oil N 62 or HE-200 is light-brown.
If it turns dark, this is a sign of early ageing due to
excessively high temperatures.

Caution

pmax
pE= ———
kth - 1

kth =

Warning Do not operate the pump without having

h-1

505
x
kth = ————— ≈ 5
100 m3 x h-1
80 mbar
pE = ———— = 20 mbar
5-1

Run the Roots pump exclusively under the
operating conditions for which it has been
designed. Any modification of the operating
parameters (e. g. intake pressure, intake
temperature, ratio between Roots pump
and backing pump) for a longer period may
place an inadmissible thermal load on the
pump. Increases in temperature which are
not compensated by taking suitable
measures may damage the Roots pump
and/or the backing pump.

Warning During normal operation temperatures
exceeding 80 °C may occur at the
discharge port, the oil chambers and the
line on the pressure side. When touching
these there is the danger of receiving burns.
Note the labels on the pump.
Never open the oil-fill or oil-drain screw (Fig.
11) in the presence of a vacuum or while
the pump is running. There is the danger
that oil may squirt out.

Operation
The oil level for the shaft seal housing must always be
visible in the oiler (10/1). The correct oil level is 1/3 of the
height of the oil when the pump is cold 1/2 of the height
of the oiler when the pump is warm. Top up any oil as
required.
For this we recommend that you use N 62 or HE 200 oil.
If it is required to top up oil very often, it is quite likely that
a shaft seal is faulty (see Section 5.8).

4.3 Shutdown and Storage

4.4 Changing from Vertical
to Horizontal Flow
The RUVAC WA/WAUs are supplied as standard for
vertical flow unless you specifically request horizontal
flow. Moreover, the pump may be converted from one
flow direction to the other.
For this proceed as follows:
Unscrew the sealing screws (10/6 and 10/7) and drain
out the oil from the side chambers.

Separate the Roots pump from the vacuum system by
closing the corresponding valve. First switch off the
Roots pump, then the backing pump.

Next, screw in the magnetic sealing screw (10/6) using a
perfect gasket in to the opening at the side and screw in
a sealing screw (10/7) using a perfect gasket into the
lower opening.

After working with corrosive gases, the system should be
vented with dry protective gas (e.g. N2) to prevent
corrosion during standstill.

Unscrew sealing screw (10/3) and drain the oil out of the
shaft seal housing. Then screw in sealing screw (10/3)
using a gasket which is in perfect condition.

When shutting down the pump and removing it from the
system, it is advisable to seal the connecting flanges
tightly.

Unscrew the feet of the pump, turn the pump by 90 ° and
fit the feet once more taking account of the changed
direction of flow.

Warning Before removing pump from the vacuum
system, disconnect it from the mains
supply.
Take note of possibly contaminated pumps.
Observe all safety regulations.

For transportation and storing of the pump, observe the
information provided in Section 2.

Caution

The longitudinal axis of the pump must
remain horizontal so that no residual
lubricant can flow from the side chambers
into the pumping chamber.

Unscrew oiler (10/1) and sealing screw (10/2). Screw in
the oiler from the top using a perfect gasket and screw in
the sealing screw from the side also using a perfect
gasket.
Fill in the oil for the side chambers at (10/8) and the oil
for the shaft seal housing at the oiler (10/1).
If a pressure switch has been installed, turn it so that it
again points vertically upwards.
The valve in the pressure balance line of the RUVAC
WAU is designed to work with both vertical and
horizontal flow of the pump.

Operation

8
1

2
7

Key to Fig. 10
1 Oiler
2 Sealing screw
3 Sealing screw
4 Feet of the pump
5 Sealing screw
6 Magnetic sealing screw
7 Sealing screw
8 Oil-fill opening

Fig. 10 Changing the direction of flow

Maintenance

5 Maintenance
5.1 Safety Information

When shipping contaminated pumps which
require approval by the authorities, you
must observe the applicable packaging and
shipping regulations.

The safety information given in the following applies to all
maintenance work.

Caution

Warning Disconnect the electrical power before
disassembling the pump and vent the pump
to atmospheric pressure. Make absolutely
sure that the pump cannot be accidentally
started.
If the pump has been pumping harmful
substances, determine the nature of hazard
and introduce suitable safety measures.

All maintenance and cleaning work
described in this section must be carried
out only by suitably trained personnel.
When disposing of used lubricants please
observe the relevant environmental
regulations.
Improper maintenance or repairs may affect
the service life and performance of the
pump, and cause problems when filing
warranty claims.

When drying or blowing out the pump with
compressed air you must – as a rule – wear
safety goggles.

Advanced repair work not described here
should be left to the LEYBOLD service.

Observe all safety regulations!
If you send a pump to LEYBOLD for repair
please indicate any harmful substances
existing in or around the pump. For this use
the “Declaration of Contamination” form
which has been prepared by us and which
we will provide upon request.
Any pump received by us without, or an
incompletely filled in declaration will delay
the repair.

We would like to point out that LEYBOLD offers training
courses on the maintenance, repair, and troubleshooting
of RUVAC pumps. Further details are available on
request.

Key to Fig. 11
1 Sealing screw for oil-drain opening in connection with a horizontal gas flow
2 Magnetic sealing screw for oil-drain opening in connection with a vertical gas flow
3 Oil level glass
3 Sealing screw for oil-fill opening
Fig. 11 Changing the lubricant

Maintenance

5.2 Oil Change/Gear Box

Caution

Warning Observe all safety information provided in

Please consult us if you intend to run the pump with
other oils or special lubricants.

Section 5.1.

We recommend the use of our special oil N
62 or HE-200.

At vertical flow the correct oil level is at the center of
the oil-level glass (8/2) when the pump is not running.
At horizontal flow the correct oil level must be 6 mm
above the center of the oil-level glass (8/2).
Very little oil is consumed by wear in the bearings and
the gear under clean operating conditions. We
recommend that you change the oil after the first 500
hours of operation to remove any wearing residue.
Then, under normal operating conditions, change the oil
after every 3,000 hours of operation.
Change the oil more frequently when pumping corrosive
vapours or large amounts of dust or when cycling
frequently from atmospheric to working pressure.
Under such operating conditions it is recommended to
regularly check the neutralisation value (to DIN 51 558)
based on a sample of oil. If the neutralisation value
exceeds 2, an oil exchange will be required.

Warning Before removing the oil-drain or oil-fill plug
always switch off the pump first and vent to
atmospheric pressure.
When the pump has become warm during
operation, the casing and the oil
temperature may exceed 80 °C.
Leave the pump to cool down. Always wear
protective gloves also to protect yourself
against aggressive residues in the oil.
To simplify the process and also for safety
reasons we recommend the use of our oildrain facility (see Section 1.4).

Unscrew the oil-drain screws (11/2) or (11/1) and the oilfill screw (11/4) and drain the oil.
Clean the sealing surface and firmly reinstall the oil-drain
screw (11/2) or (11/1) using a gasket which is in perfect
condition. Wipe off any oil residues from the casing.
Fill in new oil.
For oil quantities and ordering data see Sections 1.3 and
1.4.
Make sure to use the right kind of oil.

Caution

If the oil level is too low, the bearings and
gearwheels are not lubricated adequately; if
it is too high, oil may enter the pumping
chamber.

Clean the oil-fill port and reinstall the screw (11/5) using
a gasket which is in perfect condition. Wipe off any oil
residues from the casing.

Caution

The oil-fill port must be sealed air-tight. In
the presence of a vacuum, the entry of air
may cause oil-containing gas to enter the
pumping chamber via the impeller seals.

5.3 Oil change/shaft seal
housing
Warning Observe all safety information provided in
Section 5.1.

The oil in the shaft seal housing should be changed
every 3,000 operating hours.
Unscrew the oil-drain screw (10/3) under the shaft seal
housing, drain out the oil and screw in the oil-drain screw
using a gasket which is in perfect condition.
Fill in fresh oil at the oiler (10/1). The oil level for the shaft
seal housing must be visible in the oiler.
Maximum level
– when the pump is warm = 1/2 of the height of the
oiler
– when the pump is cold = 1/3 of the height of the oiler.
Wipe off any oil residues from the casing.

An oil without additives of viscosity class ISO VG 100
(formerly SAE 30) must be used for the pump.

Maintenance

5.4 Cleaning the Fan Cowl
and the Cooling Fins

5.6 Cleaning the Pumping
Chamber

Warning Observe all safety information provided in

Section 5.1.

The slits in the fan cowl (8/14) as well as the fins on the
motor and on the pump may be contaminated depending
on humidity conditions and the degree of contamination
in the ambient air.
In order to ensure a sufficient air flow for the motor and
the pump’s casing, the grid of the fan cowl must be
cleaned with a clean brush when contaminated.
Any coarse dirt must be removed from the fins on the
motor and the pump.

5.5 Cleaning the Dirt Trap

Section 5.1.

Under dirty operating conditions, contaminants may be
deposited in the pumping chamber or on the impellers.
After removing the two connecting lines, the
contaminants can be blown out with dry compressed air
or flushed out with a suitable solvent.
Contaminants that cannot be blown or flushed out, can
be removed completely from the pumping chamber with
a wire brush, metallic sponge or scraper.
Then change the oil.

Warning During cleaning, the impellers must be
turned only by hand.

Warning Observe all safety information provided in
Section 5.1.

A wire-mesh sieve is located in the intake port (8/5) to
collect foreign objects. It should be kept clean in order to
avoid a reduction of the pumping speed.
To do so, take off the intake line. Remove the dirt trap
from the intake flange and rinse it using a suitable
solvent. Then thoroughly dry it with compressed air. If the
dirt trap is damaged, replace it.

Achtung The loosened deposits must not remain in
the pump. After cleaning, check the pump
by slowly turning the impellers by hand.
They should move freely and without any
resistance.
Generally, the Roots pump does not need to
be disassembled. If necessary, this should
only be done by our after-sales service.

Maintenance

5.7 Cleaning the Valve of the
Pressure Balance Line

5.8 Exchanging the Shaft
Seals

Observe all safety information provided in
Section 5.1.

Remove the screws and take off the cover
(12/1)
with
O-ring (12/2).

The shaft feedthrough of the RUVAC WA/WAU is sealed
with two shaft seals. In order to reduce wear on the shaft
these shaft seals run on a bushing.

Take out the spring (12/4).

A dropping oil level in the oiler (10/1) is a sign for
malfunctioning shaft seals.

Warning

Remove the valve disk (12/6) with O-rings (12/5) and
(12/7).
If the bushing (12/3) is damaged, pull it out of the valve
disk and replace it.
Clean all parts or replace them if necessary.
Reassemble in the reverse sequence. When doing so,
check the O-rings for leak-tightness and replace if found
faulty. Finally a leak test should be run.

When the oil level in the oiler drops and when no oil
appears under the shaft seal housing, it is likely that the
inner shaft seal is faulty. In this case the oil flows from the
shaft seal housing into the bearing spaces of the pump
thereby creating in the bearing spaces an unacceptably
high oil level. In such a case the pump must be switched
off immediately and it must be repaired.
When the oil level in the oiler drops and when oil appears
under the shaft seal housing, it is likely that the outer

1
2
Key to Fig. 12
1 Cover
2 O-ring
3 Bushing
4 Spring
5 O-ring
6 Valve disc
7 O-ring

3
4
5
6
7

Fig. 12 Valve of the pressure balance line

Maintenance
shaft seal is malfunctioning. If the oil loss is only slight,
the pump may still be operated for some time, provided
the lost oil is topped up regularly.

Take the O-ring (13/5) from the housing. Remove
securing ring (13/6).

Warning Collect the oil which drips out under the

Take out snap ring (13/12) and felt ring (13/11).

motor. There is the danger that someone
may slip.
Have the pump repaired.

5.8.1 Required Special Tools
(see Fig. 14)
1.

Two-armed puller for the bushing of the RUVAC
WA/WAU 151, 251 and 501. A suitable puller must
be adapted according to Fig. 14/c. In the case of the
RUVAC 1001 and 2001 a commercially available
puller will do.

Pulling device for the coupling of the RUVAC
WA/WAU 151, 251 and 501 according to Fig. 14/b.

Shaft seal driver according to Fig. 14/b.

The shaft seal drivers can be ordered at LHVP Export in
the USA.
Order No.:
WA/WAU 151/251/501

722 81027

WA/WAU 1001/2001

722 81028

5.8.2 Preparations
Unscrew sealing screw (13/21) with the

Warning gasket, drain the oil out from the shaft seal
housing and screw the sealing screw back in
using a gasket which is in perfect condition.
Support the motor so that it can not drop.
Unscrew the nuts (13/18) and remove the
motor with the coupling piece (13/17).
Remove protection tube (13/16). Remove the coupling
element (13/15).
Unscrew screw (13/19) with the disc and pull off coupling
piece (13/14) using the puller (Fig. 14/a).
Remove key (13/13).
Unscrew screws (13/20).

5.8.3 RUVAC WA/WAU 151, 251, 501
Pull the shaft seal housing (13/8) out. Forcing threads
are provided on the shaft seal housing for this purpose.
Take the O-ring (13/4) out of the flange of the coupling.
Use the puller (Fig. 14/c) to pull the bushing (13/3)off
from the shaft.
Take the O-ring (13/2) from the shaft.

Pull out the shaft seal (13/7).

Take out shaft seal (13/10). Remove securing ring (13/9).
It is strongly recommended always to exchange the shaft
seals, the bushing and the felt ring against new parts.
Clean all other parts and replace them as required.
Fit securing ring (13/9).
Use shaft seal driver (14/b) to drive the shaft seal (13/10)
down to the securing ring (13/9) (for position of the shaft
seal refer to Fig. 13).
Fit felt ring (13/11) and snap ring (13/12).
Use shaft seal driver (14/b) to drive the shaft seal (13/7)
down. Here the depth must be defined by the tool (for
position of the shaft seal refer to Fig. 13).
Fit securing ring (13/6).

Maintenance

Key
1
2
3
4
5
6
7
8
9
10
11
12
13
14

to Fig. 13
Oiler
O-ring
Bushing
O-ring
O-ring
Securing ring
Shaft seal
Shaft seal housing
Securing ring (WA/WAU 151, 251 and 501 only)
Shaft seal
Felt ring
Snap ring
Key
Coupling piece (one half)

15
16
17
18
19
20
21
22
23
24
25
26
27
28

Coupling element
Protection tube
Motor with coupling piece (other half)
Nuts
Screw
Screw
Sealing screw (WA/WAU 1001 and 2001 only)
Securing ring
Ball bearing
Spacing disc
Wave washer
Adjusting disc
Wave washer
Adjusting disc

Fig. 13 Exchanging the shaft seal

Maintenance
Now reassemble the parts in the reverse order as for
disassembly.

5.9 Leybold Service

Before starting the pump, fill in the required amount of oil
at the oiler (see Section 3.2).

If a pump is returned to LEYBOLD, indicate whether the
pump free of substances damaging to health or whether
it is contaminated.

5.8.4 RUVAC WA/WAU 1001, 2001

If it is contaminated also indicate the nature of the
hazard. For this you must use a form which has been
prepared by us which we will provide upon request.

Use a puller to pull out shaft seal housing (13/8) and
bushing (13/3) together.

Pull the bushing out of the housing.

A copy of this form is reproduced at the end of these
Operating Instructions: “Declaration of Contamination of
Vacuum Instruments and Components”.

Take the O-ring (13/5) out of the housing. Remove
securing ring (13/6).

Please attach this form to the pump or enclose it with the
pump.

Pull out shaft seal (13/7).

This “Declaration of Contamination” is required to meet
German Law and to protect our personnel.

Remove O-rings (13/4 and 13/2).

Pull out snap ring (13/12) and felt ring (13/11).
Remove shaft seal (13/10).
Remove securing ring (13/22). Pull out bearing (13/23).
Take out spacing disc (13/24), wave washers (13/25 and
13/27) as well as adjusting discs (13/26 and 13/28).
It is strongly recommended always to exchange the shaft
seals, the bushing and the felt ring against new parts.
Clean all other parts and replace them as required.
Place adjusting disc (13/28), wave washer (13/27),
adjusting disc (13/26), wave washer (13/25) and spacing
disc (13/24) into the housing.
Drive bearing (13/23) back in.
Fit securing ring (13/22).
Use shaft seal driver (14/b) to drive the shaft seal (13/10)
down to the stop (for position of the shaft seal refer to
Fig. 13).
Fit felt ring (13/11) and snap ring (13/12).
Use shaft seal driver (14/b) to drive the shaft seal (13/7)
down.
Here the depth must be defined by the tool (for position
of the shaft seal refer to Fig. 13).
Fit securing ring (13/6).
Now reassemble the parts in the reverse order as for
disassembly.

Caution

Before starting the pump, fill in the required
amount of oil at the oiler (see Section 3.2).

LEYBOLD must return any pumps without a “Declaration
of Contamination” to the sender’s address.

Maintenance

a – Pulling device for the coupling

b– Shaft seal driver;
material: aluminium, brass or similar

RUVAC WA/WAU 151/251/501

RUVAC WA/WAU 1001/2001

c – Two-armed puller

For item 1: Reworking of the cross bar

For item 2: Reworking of both hooks
Fig. 14 Special tools

Troubleshooting

6 Troubleshooting
Fault

Possible cause

Remedy

Repair

Pump does not
start.

Motor is connected incorrectly.
Faulty pressure switch.
Oil is too thick.
Motor rotor is malfunctioning.
Pump has seized up: damaged impellers, bearings or
gearwheels.

Connect the motor correctly.
Replace the pressure switch.
Change the oil or warm the oil and the pump.
Leybold Service
Leybold Service

3.3
3.3
5.2
–
–

Pump gets too hot.

Ambient temperature is too high or cooling air supply is
restricted.
Pump is working in the wrong pressure range.
Pressure differential is too great.
Gas temperature is too high.
Clearance between casing and impellers is too small due to:
– contamination
– distortion of pump.
Excessive frictional resistance due to contaminated bearings
and/or oil.
Oil level is too high.
Oil level is too low.
Wrong oil has been used.
Bearings are malfunctioning.
Valve of pressure balance line does not open.

Install the pump at a suitable site or ensure
enough cooling air.
Check pressure values of vacuum system.
Check pressure values of vacuum system.
Check the vacuum system.

3.1/5.4

Clean the pumping chamber.
Ensure that the feet and connecting lines aren’t placing a
strain on the pump.
Exchange oil.
Drain some oil to reach the correct level.
Add oil to reach the correct level.
Drain oil and fill in correct lubricant.
Leybold service
Clean or repair the valve.

5.6
3.1/3.4

Power consumption of the motor is
too high.

See fault “Pump gets too hot”.
Wrong mains voltage supply for the motor.
Motor is malfunctioning.
Oil is too thick

See fault “Pump gets too hot”.
Connect the motor to the correct voltage supply.
Repair the motor or exchange it.
Exchange the oil or warm up the oil and the pump.

–
1.3/3.3
–
–

Pump is too loud.

Clearance between casing and impellers is too small due to :
– contamination
– distortion of the pump.

Clean the pumping chamber.
Ensure that the feet and connecting lines aren’t placing a
strain on the pump.
Leybold service, switch off the pump immediately.
Leybold service, switch off the pump immediately.
Leybold service, switch off the pump immediately.
Leybold service.
Leybold service, switch off the pump immediately.

5.6
3.1/3.4

Drain lubricant, firmly screw in the oil-drain plug
with a new gasket, fill in the correct quantity.
Leybold service.
Replace the O-ring of the gearbox cover.
Leybold service, switch off the pump immediately.

5.2

See fault “Oil in the pumping chamber”.

–

Exchange shaft seals. If the oil loss is only slight, the pump
may still be operated for some time provided the lost oil is
topped up regularly.
Exchange shaft seals. Switch the pump off; oil flows into the
bearing spaces of the pump thereby creating in the bearing
spaces an unacceptably high oil level.

5.8

Bearing or gearing is damaged.
Impellers strike the casing.
Rotor runs out of true.
Centrifugal disc lubricator strikes gear lid or oil tube.
Oil pump obstructed or malfunctioning.
Pump looses oil.

Oil leak is visible:
Oil-drain plug is not tight.
Oil-level glass is not tight.
Gearbox cover is not tight.
Oil puddle under the motor, leaky can
No oil leak is visible:
See fault “Oil in the pumping chamber”.

Oil level in the oiler
drops.

Oil leak is visible:
Outer shaft seal is malfunctioning.
No oil leak is visible:
Inner shaft seal is malfunctioning.

–
–
–

5.2
5.2
5.2
–
5.7

–
–
–
–
–

–
–
–

5.8

Oil turns dark.

Oil has broken down.
Pump gets too hot.

Change the oil.
See fault “Pump gets too hot”; after solving the
problem, change the oil.

5.2
–

Oil in the pumping
chamber.

Oil level is too high.
Oil leaks out of the system.
Pump is not installed on a flat horizontal surface.
Pump has an external leak.

5.2
–
3.1
3.2/5.2

Pump has an internal leak.
Impeller rings are malfunctioning.

Drain lubricant to reach the correct oil level.
Check system.
Install pump correctly.
Check proper fit of oil-fill and oil-drain plugs, replace gaskets
if necessary.
Replace O-ring of the gearbox cover.
Leybold service
Leybold service

Dirt trap in the intake flange is clogged.
Motor is connected incorrectly.
Motor faulty.
Pump or pump system has a leak.
Clearance of impellers is too large.
Bearing is malfunctioning.
Valve of the pressure balance line does not close.
Flow resistance in the intake or discharge line is too high

Clean the dirt trap.
Connect the motor correctly.
Leybold service
Find and seal the leak.
Leybold service
Leybold service
Clean or repair the valve.
Use intake and discharge lines of sufficient diameter.

5.5
3.3
–
–
–
–

Pumping speed of
the pump is too
low.

* for repair information, refer to the stated section in the Operating Instructions

–
–
–

4.7

EEC Manufacturer’s Declaration
in the sense of the Directive on Machinery 89/392/EWG, Annex IIb

We – Leybold Vacuum GmbH – herewith declare that
operation of the incomplete machine defined below, is
not permissible until it has been determined that the
machine into which this incomplete machine is to be
installed, meets the regulations of the EEC Directive on
Machinery.

Designation of the products: Roots pumps

Types: RUVAC WA without motor

Applied harmonised standards:
• EN 292 Part 1 and Part 2

Nov. 1991

• pr. EN 1012 Part 2

1993

Applied national standards and technical
specifications:
• DIN 31 001

April 1983

• DIN ISO 1940

Dec. 1993

Cat. Nos.:

Cologne, Oct. 2, 1996

—————————————————————
Plingen, Business Area Manager
Forevacuum pumps

—————————————————————
Frings, Design Department Manager
Forevacuum pumps

LK.GV.0101.02 - 10.96

117 24; 117 34; 117 44

Declaration of Contamination of Vacuum Equipment and Components

Copies: Page 1 (white) to manufacturer or representative - Page 2 (yellow) attach to consignment packaging securety - Page 3 (blue) copy for file of sender

The repair and/or service of vacuum equipment and components will only be carried out if a correctly completed declaration has
been submitted. Non-completion will result in delay. The manufacturer could refuse to accept any equipment without a
declaration.
This declaration can only be completed and signed by authorized and qualified staff.

1. Description of Vacuum Equipment and Components
-

Equipment type/model:
Code No.:
Serial No.:
Invoice No.:

- Delivery date:

2. Reason for Return
____________________________________________
____________________________________________
____________________________________________
____________________________________________
____________________________________________
____________________________________________

_________________________________
_________________________________
_________________________________
_________________________________

__________________________

3. Condition of the Vacuum Equipment and Components
- Has the equipment been used?
yes ❒
no ❒
- What type of pump oil/liquid was used? _________
- Is the equipment free from potentially
harmful substances?
yes ❒
(go to Section 5)
no ❒
(go to Section 4)

E
L

4. Process related Contamination of Vacuum
Equipment and Components:
-

M
A

toxic
corrosive
explosive*)
biological hazard*)
radioactive*)
other harmful substances

yes
yes
yes
yes
yes
yes

❒
❒
❒
❒
❒
❒

no
no
no
no
no
no

❒
❒
❒
❒
❒
❒

*) Vacuum equipment and components which have been contaminated by biological explosive or radioactive substances, will
not accepted without written evidence of decontamination!
Please list all substances, gases and by-products which may have come into contact with the equipment:

Trade name
Product name
Manufacturer

Chemical name
(or Symbol)

Dangerous
material class

Measures
if spillage

First aid in case of
human contact

1.
2.
3.
4.
5.

Legally Binding Declaration
I hereby declare that the information supplied on this form is complete and accurate. The despatch of the contaminated
vacuum equipment and components will be in accordance with the appropriate regulations covering Packaging,
Transportation and Labelling of Dangerous Substances.
Name of organisation or company:_____________________________________________________________________
Address:

_____________________________

Post code:______________________________________

Tel.:

______________________________________________________________________________

Fax:

_____________________________

Name:

______________________________________________________________________________

Job title:

______________________________________________________________________________

Date:

_____________________________

Telex: _________________________________________

Company stamp:

30 30

Order No.: 2121

Declaration of Conformity
We – LEYBOLD Vacuum GmbH – herewith declare that
the products defined below meet the basic requirements
regarding safety and health of the relevant EEC
directives by design, type and versions which are
brought into circulation by us.

The products conform to the following directives:
•

EEC Directive on Machinery (89/392/EWG)
and subsequent. 91/368/EWG

•

EEC Directive on Low Voltages (73/23/EWG)

In case of any product changes made without our
approval, this declaration will be void.

•

EEC Directive on Elektromagnetic Compatibility
(89/336/EWG)

Designation of the products: Roots pump

Applied harmonised standards:

Types

• EN 292 Part 1 and Part 2

Nov. 1991

RUVAC WA

• pr. EN 1012 Part 2

1993

RUVAC WAU

• EN 60 204

1993

Applied national standards and technical
specifications:

Cat. Nos.:
117 10; 117 11; 117 20; 117 21;
117 30; 117 31; 117 40; 117 41;

• DIN 31 001

April 1983

• DIN ISO 1940

Dec. 1993

117 50; 117 51
917 10; 917 11; 917 20;
917 21; 917 30; 917 31;
917 40; 917 41; 917 50;
917 51;

Cologne, Oct. 2, 1996

—————————————————————
Plingen, Business Area Manager
Forevacuum pumps

—————————————————————
Frings, Design Department Manager
Forevacuum pumps

LK.GV.0120.02.10.96

118 31; 118 41; 118 51

Bonner Straße 498 (Bayenthal)
D-50968 Köln
Telefon: (0221) 347-0
Telefax: (0221) 347-1250

Printed in Germany on chlorine-free bleached paper

10.96
OF/RSP
LK.1.80.6.637.45

LEYBOLD VAKUUM GmbH

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