Pfeiffer Vacuum MVP 040-2 User manual

Betriebsanleitung • Operating Instructions
PU 0050 BE/A (0809)
Diaphragm Pumps
MVP 040-2, MVP 070-3/3C
Translation of the Original Operating Instructions

2
Table of contents
Table of contents
1Aboutthismanual......................................3
1.1 Validity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2Safety................................................4
2.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Proper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Improper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3Transportandstorage..................................6
3.1 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4Productdescription....................................7
4.1 Product identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5Installation...........................................10
5.1 Setting up the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.2 Connecting the vacuum side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.3 Connecting the exhaust side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4 Connecting to the mains power supply . . . . . . . . . . . . . . . . . . . . . . 11
6Operation............................................13
6.1 Before switching on the pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.2 Switching on the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.3 Pumping condensable vapours. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.4 Switching off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7Maintenance..........................................15
7.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.2 Cleaning and replacing diaphragm and valves . . . . . . . . . . . . . . . . 16
7.3 Replacing the device fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8Decommissioning.....................................26
8.1 Shutting down for longer periods. . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9Malfunctions.........................................27
9.1 Rectifying malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
10 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
11 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
12 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
13 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
13.1 Substances in contact with the media . . . . . . . . . . . . . . . . . . . . . . . 33
13.2 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

3
About this manual
1Aboutthismanual
1.1 Validity
This operating manual is for customers of Pfeiffer Vacuum. It describes the func-
tioning of the designated product and provides the most important information for
safe use of the unit. The description follows applicable EU guidelines. All informa-
tion provided in this operating manual refer to the current state of the product's de-
velopment. The documentation remains valid as long as the customer does not
make any changes to the product.
Up-to-date operating instructions can also be downloaded from
www.pfeiffer-vacuum.net.
Applicable docu-
ments
*also available via www.pfeiffer-vacuum.net
For information about other certifications, if applicable, please see the signet on
the pump or:
•www.tuvdotcom.com
•TUVdotCOM-ID0000021320
1.2 Conventions
Safety instructions The safety instructions in Pfeiffer Vacuum operating manuals are the result of risk
evaluations and hazard analyses and are oriented on international certification
standards as specified by UL, CSA, ANSI Z-535, Semi-S1, ISO 3864 and DIN 4844.
In this document, the following hazard levels and information are considered:
MVP 040-2, MVP 070-3/3C Operating instructions
Safety information for vacuum pumps "Safety Guide" PT 0300 BN*
Declaration of Conformity Part of this document
Operating instructions for accessories (order-specifically) see section "accessories"*
DANGER
Immediate danger
Death or very severe injuries occur.
WARNING
Possible danger
Death or injuries may occur.
CAUTION
Possible danger
Medium to slight injuries may occur.
NOTE
Command or note
Command to perform an action or information about properties, the disregarding of
which may result in damage to the product.

4
Safety
Pictograph
definitions
Instructions in the
text
!Work instruction: here you have to do something.
Abbreviations used C version: Corrosive gas version
Symbols used The following symbols are used consistently throughout in all illustrations:
Vacuum connection
Exhaust
Gas ballast valve
Power connection
2Safety
2.1 Safety precautions
•Beforepumpingdangerous,corrosiveorenvironmentallyhazardousmedia,
take suitable precautions:
–Testthecompatibilitywithsubstancesincontactwiththemedia.
–Preventthereleaseofprocessgasesandtheirreactionproductsandby-pro-
ducts or dispose of them according to the relevant regulations.
–Safetymeasures(e.g.wearingprotectiveclothingandsafetygoggles)topre-
vent inhalation and skin contact.
•Beforepumpinggaseswhichcouldformignitablemixtures,takesuitablepre-
cautions:
– By implementing the required safety measures, prevent potentially explosive
mixtures from occurring in the housing and from being ignited in the event of
a diaphragm crack by mechanically produced sparks, hot surfaces or static
electricity.
Prohibition of an action or activity in connection with a
source of danger, the disregarding of which may result in
serious accidents.
Warning of a displayed source of danger in connection
with operation of the unit or equipment.
Command to perform an action or task associated with a
source of danger, the disregarding of which may result in
serious accidents.
V
G
NOTE
Duty to inform
Each person involved in the installation, operation or maintenance of the vacuum
pump must read and observe the safety-related parts of these operating instructions.
!The operator is obligated to make operating personnel aware of dangers originating
from the vacuum pump, the pumped medium and the entire system.

5
Safety
–Ifnecessary,useinertgasforgasballastsupplyorventilation.
•Connectthevacuumpumptoashockproofsocketonly.
–Useonlyundamagednetworkcableswhichcomplywiththeregulations.
–Makesurethatthegroundingissufficient.
•Donotexposeanybodypartstothevacuum.
•Observethesafetyandaccidentpreventionregulations.
•Checkregularlythatallsafetyprecautionsarebeingcompliedwith.
•Donotcarryoutanyunauthorisedmodificationsorconversionstothepumps.
• Depending on the operating and ambient conditions, the surface temperature of
the pumps may rise above 70 °C. Use suitable finger guards if necessary.
• When returning the pumps to us please note the instructions in the Service sec-
tion.
2.2 Proper use
•Thevacuumpumpmayonlybeusedtogenerateavacuum.
• Installation, operating and maintenance regulations must be complied with.
•Otheraccessoriesthanthosedescribedinthismanualmustnotbeusedwithout
the agreement of Pfeiffer Vacuum.
• When pumping gases which could form explosive or ignitable mixtures, take
suitable precautions:
–Ifnecessary,connectinertgasforventilationorgasballastsupply.
2.3 Improper use
Improper use will cause all claims for liability and guarantees to be forfeited. Im-
proper use is deemed to be all use for purposes deviating from those mentioned
above, especially:
•Pumpingofcorrosivegases(exception:pumpsinCversion).
•Pumpingofexplosivemedia.
•Operationofthepumpinpotentiallyexplosiveareas.
• Pumping of gases containing impurities such as particles, dusts and condensate;
note the vapour compatibility levels of the pump.
•Pumpingofsubstancesthattendtosublime.
•Useofthevacuumpumptogeneratepressure.
•Pumpingofliquids.
•Connectiontopumpsorunitswhicharenotsuitableforthispurposeaccording
to their operating instructions.
•Connectiontounitswhichhaveexposedvoltage-carryingparts.
Improper use of the equipment automatically invalidates all warranty and liability
claims.
NOTE
CE conformity
The manufacturer's declaration of conformity becomes invalid if the operator modifies
the original product or installs additional components.
!Following installation into a plant and before commissioning, the operator must
check the entire system for compliance with the valid EU directives and reassess it
accordingly.

6
Transport and storage
3Transportandstorage
3.1 Transport
!Remove the locking cap from the vacuum and fore-vacuum flange immediately
before connecting!
!Use only the handles provided for that purpose to lift the pump.
–Donotusetheinterheadconnectionsonthetopsideofthepumptocarrythe
pump.
Fig. 1: Lifting and transporting the pump
3.2 Storage
!Check that all the openings on the pump are securely closed.
!Store the pump in a cool, dry place; preferably at room temperatures (approx.
20°C).
–Foralongerperiodofstorage,sealthepumpinaPEbagwithdryingagents
enclosed.

7
Product description
4Productdescription
4.1 Product identification
To corr ec t l y i dent i f y t h e p rod u ct w hen comm u nicati n g w ith Pf eiffe r Va c uum, al -
ways have the information from the rating plate available.
• Pump model and model number
• Serial number
•Dateofmanufacture
Scope of delivery •Pumpwithmainspowersupply(switchable)viarubbersocket
•Lockingcapsforvacuumandexhaustflange
•Operatingmanual
Differences between
the pump versions Pump type Pump designs
MVP 040-2
Standard version:
•G1/4"elbowunionwithenclosedhose10/8,1000mmwithanelbowunion
in G 1/4" at the end
MVP 070-3
Standard version:
•G1/4"elbowunion+enclosedhose10/8,1000mmwithaelbowunionin
G 1/4" at the end
MVP 070-3C C version:
•ForDN16ISO-KF

8
Product description
4.2 Function
The diaphragm vacuum pumps of the series MVP 070-3 are three stage and those
of the MVP 040-2 series are two stage, dry compressor vacuum pumps. The pumps
are positive displacement pumps with a periodic change of size of the suction
chamber produced by the movement of the diaphragm. The gas flow causes the
valves to open and close automatically. The pump units are directly connected to
the drive motor.
Fig. 2: MVP 040-2
Fig. 3: MVP 070-3
A1 Vacuum connection
2.1 Exhaust (with silencer)
ADiaphragmhead1
BDiaphragmhead2
NPowerswitch
UVoltageselectorswitch
23 Hose connection
40 Gas ballast valve
A1 Vacuum connection
2.1 Exhaust (with silencer)
NPowerswitch
UVoltageselectorswitch
23 U N 2.1 40
A A1 B
2.1 U N
A1

9
Product description
Fig. 4: MVP 070-3C
A1 Vacuum connection
2.1 Exhaust
NPowerswitch
UVoltageselectorswitch
40 Gas ballast valve
A1
40
2.1
U N

10
Installation
5 Installation
5.1 Setting up the pump
Installation location Observe the following requirements when setting up the pump:
•Notetheload-bearingcapacityofthemountingsurface.
•Maximuminstallationaltitude2000m(abovemeansealevel)
• Permissible ambient temperature: +12 ... 40°C
•Maximumrelativehumidity85%
!Always place the pump on a firm, even surface.
– Where stationary installation is involved, anchor the pump on site.
!When installing the pump in a closed housing, ensure there is sufficient air cir-
culation.
–Voltageandfrequencyinformationgivenonthemotorratingplatemustbe
visible.
–Ifvacuumpumpisinstalledabove1000mabovemeansealevelcheckcom-
patibillity with applicable safety requirements, e.g. DIN EN 61010 (motor may
overheat due to insufficient cooling).
5.2 Connecting the vacuum side
!Remove locking cap on intake connection and connect vacuum pump to the ap-
paratus.
!The connection between the pump and the recipient should be kept as short as
possible.
–Dependingonthepumptype,usemetallichosesorPVChoseswithflange
connections.
–Separators,filtersetc.maybeinstalledupstreamtoprotectthepump(seeac-
cessories). However, please observe the loss of pumping capacity due to the
conductivity of the accessories.
5.3 Connecting the exhaust side
!Choose the cross-section of the exhaust line to be at least the size of the nominal
connection diameter of the vacuum pump's exhaust connection.
!Piping to the pump must be suspended or supported.
–Physicalforcesfromthepipingsystemmustnotbeallowedtoactonvacuum
pumps.
!Lay piping from the pump sloping downward so that no condensate can flow
back into the pump; otherwise fit a condensate separator.
–Ifanairtrapiscreatedinthesystem,thenadevicefordrainingcondensation
water must be provided at the lowest point.
CAUTION
High pressure in the exhaust line!
Danger of damage to the seals and danger of the pump bursting.
!Install the line without shut-off valves on the exhaust side.
!Pumpe nicht mit Überdruck am Einlass betreiben; max. zulässige Drücke und Druck-
differenzen beachten.

11
Installation
5.4 Connecting to the mains power supply
The pump is driven by single-phase extended voltage range motors with revers-
ible voltage ranges.
WARNING
Emission of toxic substances from the exhaust!
Danger of poisoning from emitted gases or vapours, which can be detrimental to
health and/or can pollute the environment, depending on the particular application.
!Comply with the applicable regulations when working with toxic substances.
!Only officially approved filter systems may be used to separate and remove these
substances.
CAUTION
Excess voltage!
Danger of destroying the motor.
!Power connections must comply with local regulations. Voltage and frequency infor-
mation given on the motor rating plate must correspond to the mains voltage and
frequency values.
!To prot ec t th e mot o r and s u pp l y cab le i n cas e o f ma lfu nc ti o n, m ai ns f use pr o te c tio n
must be implemented.

12
Installation
Single phase motors !The mains voltage must be determined on-site each time before the pump is in-
stalled or moved to a different location.
Changing the voltage range
!Disconnect the pump from the power supply.
!Set the desired voltage range on the voltage selector switch using a suitable
screwdriver.
Motor protection
A self-locking thermal winding protector switches off the pump motor in the event
of overheating.
!Allow the pump to cool off several minutes and do not switch it back on until it
has cooled off.
Intermittend opera-
tion with TC via relay
box (accessory)
Connection of diaphragm pumps in the pumping station according wiring diagram
in operating instructions PT 0030 BN of the Backing Pump Relay Boxes:
Fig. 5: Connection with relay box (PM 061 372-T/374-T) to TC 110/400
NOTE
Overvoltage!
An incorrect voltage range setting can damage the motor.
!Disconnect the pump from the power supply.
!Only change the voltage range when the pump is disconnected from the power
mains.
Switch position: "115" "230"
Voltage ranges: 100-115 V, 50/60 Hz,
120 V, 60 Hz 200-230 V, 50/60 Hz
11 5
230
11 5
230
3
accessory A
MVP-Reihe
MVP series
TC
L
N
PE
PE
N
L´
4

13
Operation
6 Operation
6.1 Before switching on the pump
!Compare the voltage information on the rating plate with the mains voltage.
!Check that the exhaust connection allows free flow (max. permissible pressure
1. 1 ba r a b so lu t e) .
–Activatetheshut-offvalvesinsuchawaythattheyopenbeforeoratthesame
time as the pump is started.
!Protect the pump sufficiently from taking in contaminants by means of suitable
precautions (e.g. dust filters).
6.2 Switching on the pump
The pump can be switched on in any pressure range.
No special precautions are necessary when pumping dry gases. In order to attain
the lowest possible final pressures, the gas ballast valve should be closed.
The pump attains the stated values for throughput rates and final pressure levels
only once the operating temperature is reached (after approximately 15 minutes).
!Switch on the pump with the vacuum flange closed and allow to warm up for 15
minutes.
CAUTION
Dangerous overpressure overload!
Mixing up the connections leads to a dangerous overpressure overload in the pump,
and the motor could be damaged.
!Before commissioning, it is imperative that you ensure that the pressure does rise
above the maximum permissible pressure on the pressure side.
!Start pumps at a maximum pressure differential of 1 bar between inlet and outlet.
CAUTION
Hot surface!
Danger of burns if hot parts are touched. Depending on the operating and ambient
conditions, the surface temperature of the pump may rise above 70 °C.
!In this case, use suitable finger guards.

14
Operation
6.3 Pumping condensable vapours
Should the process gases contain condensable gases present at high percentages,
the vacuum pump must be operated with a gas ballast (i.e. with an open gas ballast
valve).
Gas ballast valve Letting in gas ballast improves the discharge of condensate, and the pump
achieves the specified final vacuum more quickly.
Fig. 6: Operation with gas ballast valve
!Open gas ballast valve; to do so, turn cap 43 on the gas ballast valve 40 so that
the two holes line up.
6.4 Switching off
The pump can be switched off in any pressure range.
WARNING
Reactive, explosive or otherwise dangerous mixtures!
Uncontrolled gas inlet at the gas ballast valve can result in dangerous mixtures.
!By implementing the required safety measures, the user must prevent potentially ex-
plosive mixtures from occurring in the inside of the pump and from being ignited in
the event of a diaphragm crack by mechanically produced sparks, hot surfaces or
static electricity.
!If necessary, use inert gas for ventilation and gas ballast supply.
NOTE
Bad final vacuum and damage to the pump!
Danger of condensation and a reduced final vacuum during operation without a gas
ballast or in case of insufficient supply of flushing gas.
!Only pump vapors when the pump is warm and the gas ballast valve is open.
!When the process has been completed, allow the pump to continue running for
about 30 minutes at atmospheric pressure with the gas ballast open.
40Gas ballast valve
43 Cap
43
40

15
Maintenance
7Maintenance
7.1 Precautions
The valves and the diaphragms are wear parts. If the rated ultimate vacuum is no
longer achieved, the pump interior, the diaphragms and the valves must be
cleaned and the diaphragms and valves must be checked for cracks or other dam-
age.
Depending on individual cases it may be efficient to check and clean the pump
heads on a regular basis. In case of normal wear the lifetime of the diaphragms and
valves is > 10000 operating hours.
!Allow the pump to cool to a safe temperature.
!Only dismantle the pump as far as necessary in order to repair defects.
!Use only alcohol or similar agents for cleaning pump parts.
!Re-assemble pump in reverse order.
WARNING
Pump parts may be contaminated from pumped media!
Danger of poisoning due to contact with harmful substances.
!Decontaminate the pump before carrying out any maintenance work.
!In the event of contamination, take suitable safety precautions to prevent your health
from being harmed by any dangerous substances.
NOTE
Service work should be carried out by qualified personal only!
Pfeiffer Vacuum is not liable for any damage to the pump resulting from work carried
out improperly.
!Take advant age of our ser vice training programs; addit ional information at
www.pfeiffer-vacuum.net.
!Please state all the information on the pump rating plate when ordering spare parts.

16
Maintenance
Checklist for inspec-
tion, maintenance
and overhaul
Certain repair and overhaul work should only be performed by Pfeiffer Vacuum
Service (PV). Pfeiffer Vacuum will be released from all warranty and liability claims
if the required intervals for inspection, maintenance, or overhaul are exceeded or
inspection, maintenance, repair or overhaul procedures are not performed proper-
ly. This also applies if replacement parts other than Pfeiffer Vacuum OEM replace-
ment parts are used.
Depending on the process, the required intervals for inspection and maintenance can exceed the
typical values specified in the table. Please consult Pfeiffer Vacuum if necessary.
7. 2 C l e a n i n g a n d r e p l a c i n g d i a p h r a g m a n d v a l v e s
MVP 040-2 Cleaning and repla-cing the valves
!Tur n off th e va c uu m pu m p, ven t t o at m o s p heri c p r es sure and al l o w t o co ol, i f
necessary.
!Disconnect the drive motor from the mains and secure it so that it cannot be
switched on.
!Unscrew the hose connection between the pump stages by loosening the hol-
low screw with a wrench (size 17).
!Remove the cheesehead screws 26 (four per membrane head).
!Remove housing cover G with head cover K; prevent the head cover from falling
out of the housing cover.
!Remove head cover K from housing cover G to check valve seals 11.
!Ta k i n g c a r e w i t h t h e p o s i t i o n o f v a l v e s e a l s 11 , r e m o v e a n d ch e ck f o r d a m a g e ,
and replacing if necessary.
!Check diaphragm pair 10 for damage and replace if necessary.
!Clean all parts and inspect for wear.
!Re-assemble pump in reverse order.
!Check the other membrane head in the same way.
Activity daily as required; at least once every six months as required; at least annually as required; at least every 2 years
Check silencer for contamination X
Clean, change valves and diaphragms X
Change silencer X
NOTE
Damage to the valve seals
Valve seals can be destroyed by gluing to after wrong installation.
!Pay attention to the fitting position of the inlet and outlet valve seals. The valve flap
of the valves may not cover the groove in the head and housing cover K/G.

17
Maintenance
Fig. 7: MVP 040-2
Changing the Diaphragm
!Dismantle membrane heads as described before.
!Remove screw 16; this screw has been stuck to make secure against loosening.
!Dismantle diaphragm spring washer 3, diaphragm pair 10 and diaphragm sup-
port washer 9.
–Ifitisdifficulttoseparatetheolddiaphragmfromsupportwasher9,applye.g.
alcohol or petroleum ether.
Assembly
!When existing, re-fit spacers D under the diaphragm support washer 9.
!Put two single diaphragms with their rough side together so that the labelled
side of the two diaphragms are readable.
!Arrange diaphragm support washer 9, diaphragm pair 10 and diaphragm spring
washer 3 onto screw 16.
!Place some threadlocker (low strength) under the head of screw 16 and screw in
con-rod.
!Refit head cover, valve seals and housing cover in reverse order, taking care with
the position of valve seals 11.
G1 K1 17 6 D 9 10 3 16 K2 G2 26
40 A1
2.3 K1 2.1
2.3
11
A1 Vacuum connection with
compression coupling in G
1/4"
DSpacerdisks
G1 Housing cover, inlet side
G2 Housing cover, outlet side
K1 Head cover, inlet side
K2 Head cover, outlet side
2.1 Silencer
2.3 Sealing ring
3Diaphragmspringwas-
her
6Housingpanel
9Diaphragmsupportdisk
10 Diaphragm pair
11 I n l e t a n d o u t l e t v a l v e
seal
16 Countersink screw
17 Countersink screw
26 Socket cap screw
40 Gas ballast valve
NOTE
Damage to the pump and reduced final vacuum!
A changed dead centre (TDC) leads in the most unfavorable case to a bearing damage.
!Check for washers D under diaphragm support washer.
!Make sure that the original number is reassembled at the individual membrane head.

18
Maintenance
!First gently and then firmly tighten diagonally-offset cheesehead screws26;
torque: 12 Nm.
Fig. 8: Position of the valve seals 11 in the head covers K1/K2
NOTE
Dissimilar valves!
Pump not achieving the specified end pressure
!Make sure the valves have the correct mounting orientation; the outlet valve in head
cover K1 and the inlet valve in head cover K2 are from PTFE (white). The two other
valves are from FPM (brown).
NN
V
K1 K2

19
Maintenance
MVP 070-3 Cleaning and repla-cing the valves
!Tur n off th e va c uu m pu m p, ven t t o at m o s p heri c p r es sure and al l o w t o co ol, i f
necessary.
!Disconnect the drive motor from the mains and secure it so that it cannot be
switched on.
!Mount pump to the side, provide suitable support as necessary.
!Remove the cheesehead screws 26 (four per membrane head).
!Remove housing cover G with head cover K; prevent the head cover from falling
out of the housing cover.
!Remove head cover K from housing cover G to check valve seals 11.
!Ta k i n g c a r e w i t h t h e p o s i t i o n o f v a l v e s e a l s 11 , r e m o v e a n d ch e ck f o r d a m a g e ,
and replacing if necessary.
!Check diaphragm pair 10 for damage and replace if necessary.
!Replace the two O-rings 12 enclosing the valve seat.
!Clean all parts and inspect for wear.
!Re-assemble pump in reverse order.
!Follow the same procedure for the other diaphragm heads.
Fig. 9: MVP 070-3
D 9 10 3 K1 11 26 G1
12
11
K4
2.3
2.1
A1
G2
G1 Housing cover 1
G2 Housing cover 2
K4 Head cover membrane head 4
2.1 Silencer
2.3 Seal ring
3Diaphragmspringwas-
her
9Diaphragmsupport
washer
10 Diaphragm pair
11 I n l e t a n d o u t l e t v a l v e
seal (standard)
12 O-ring
26 Cheesehead screw

20
Maintenance
Changing the Diaphragm
Attach the diaphragm key !Carefully raise the diaphragm at the side without causing it any damage; do not
use sharp-edged tools.
!Slide diaphragm key under the diaphragm until it reaches the support disk.
!Use the diaphragm key to loosen the diaphragm support disk and unscrew to-
gether with diaphragm and diaphragm spring washer.
!If the old diaphragm pair is difficult to separate from the diaphragm support disk
9, loosen in alcohol or petroleum.
Assembly
!Assembling is carried out in reverse order.
!Put two single diaphragms with their rough side together so that the labelled
side of the two diaphragms are readable.
!Position new diaphragm pair 10 between diaphragm spring washer 3 with
square head screw and diaphragm support washer 9; make sure that the square
head screw of the diaphragm clamping disc is correctly seated in the guide hole
of the diaphragm support disc.
Installing the diaphragm !Raise the diaphragm at the side and carefully slide the diaphragm key through
to the diaphragm support disk.
!Screw diaphragm spring washer, diaphragm, diaphragm support washer and
spacers (if applicable) to connecting rod; optimum torque: 6 Nm.
–Itisrecommendedtouseatorquekey,attachhexkeytodiaphragmkey(he-
xagonal bolt 6 mm wide).
!Bring the diaphragms into a position in which they are in contact with the hou-
sing and centred with respect to the bore.
!Mount head cover; ensure correct orientation:
–Alignthenose(N)withthenotchinthehousingcover.
!Insert the valve seals and O-rings into their respective positions; ensure the val-
ves are correctly aligned.
!Mount housing cover; insert the connecting pipe for the two housing covers on
the housing cover;
–ensurethesealingringsarecorrectlypositionedinthepipegrooves;replace
O-rings as necessary.
!Refit head cover, valve seals and housing cover in reverse order, taking care with
the position of valve seals 11.
!First gently and then firmly tighten diagonally-offset cheesehead screws26;
torque: 12 Nm.
NOTE
Damage to the pump and reduced final vacuum!
A changed dead centre (TDC) leads in the most unfavorable case to a bearing damage.
!Check for washers D under diaphragm support washer.
!Make sure that the original number is reassembled at the individual membrane head.