Welch MP 601 E User manual

Operation Manual
(EN)
Translation of the german original manual
Diaphragm pumps
Models:
► MP / MPC / MPC-X2
601 E
301 Z
412721
2017-02-01
2 - headed

We are constantly working on the further
development of all our product types.
Reprinting or reproduction of this manual,
including extracts, is not allowed without the
prior written permission of Co. Gardner
Denver Thomas GmbH.
All rights under the copyright laws are
expressly reserved by Co. Gardner Denver
Thomas GmbH.
We reserve the right to make changes and
amendments.
Gardner Denver Thomas GmbH
Am Vogelherd 20
98693 Ilmenau
Germany
T [phone]
F [phone]
[e-mail]
www.welchvacuum.com
Customer Support [phone]

Contents
412721 3
Contents
1Important Information....................................................................................................................4
1.1 General Information .........................................................................................................................4
1.2 Target Groups..................................................................................................................................4
1.3 Intended Use....................................................................................................................................4
1.4 Use for an Unauthorized Purpose....................................................................................................4
1.5 Safety Devices.................................................................................................................................5
1.6 Meaning of the Warning notes.........................................................................................................5
1.7 Product Standards, Safety Regulations...........................................................................................5
2Basic Safety Instructions ..............................................................................................................6
2.1 General Information .........................................................................................................................6
2.2 Electricity..........................................................................................................................................6
2.3 Mechanical Systems........................................................................................................................6
2.4 Hazardous Substances....................................................................................................................7
2.5 High Temperatures ..........................................................................................................................7
3Description .....................................................................................................................................8
3.1 Design..............................................................................................................................................8
3.2 Principle of Operation.......................................................................................................................8
3.3 Gas ballast.......................................................................................................................................8
3.4 Areas of Application.........................................................................................................................8
3.5 Pump head circuitry .........................................................................................................................9
3.6 Materials of the medium-affecting pump parts.................................................................................9
3.7 Scope of Delivery.............................................................................................................................9
3.8 Accessories......................................................................................................................................9
3.8.1 Connection variants A –K..............................................................................................................10
4Technical Data..............................................................................................................................11
4.1 Dimensions ....................................................................................................................................11
4.2 Intake Pressure / Pumping Speed –Diagram................................................................................11
4.3 Device Data....................................................................................................................................12
5Installation and Operation...........................................................................................................13
5.1 Unpacking......................................................................................................................................13
5.2 Installation and Connection............................................................................................................13
5.3 Operation .......................................................................................................................................13
5.4 Storage...........................................................................................................................................13
5.5 Scrap Disposal...............................................................................................................................13
6Maintenance and Servicing.........................................................................................................14
6.1 General Requirements...................................................................................................................14
6.2 Maintenance Performed by the User .............................................................................................14
6.2.1 Disassembly...................................................................................................................................15
6.2.2 Assembly........................................................................................................................................15
6.2.3 Test................................................................................................................................................16
6.3 Maintenance by the Manufacturer..................................................................................................16
6.4 Damage Report..............................................................................................................................16
7Troubleshooting...........................................................................................................................17
8Spare Parts Overview ..................................................................................................................18
8.1 Service kit.......................................................................................................................................18
8.2 Spare parts view ............................................................................................................................19
8.2.1 Spare parts list diaphragm pumps MP 601 E.................................................................................20
8.2.2Spare parts list diaphragm pumps MP 301 Z.................................................................................21
8.2.3 Spare parts list diaphragm pumps MPC 601 E..............................................................................22
8.2.4 Spare parts list diaphragm pumps MPC 301 Z ..............................................................................23
8.2.5 Spare parts list diaphragm pumps MPC 601 E-X2, MPC 301 Z-X2...............................................24
-Instructions for certification - Diaphragm Pumps MPC -
for use in Zone 2 in accordance with device category 3 per ATEX Directive 2014/34/EU
(Page 1 - 3)
- EC Declaration of Conformity

Important Information
4 412721
1 Important Information
1.1 General Information
The Diaphragm Pumps conform to the following directives:
2006 / 42 / EC
Machinery Directive
2014/ 30 / EU
Electromagnetic Compatibility Directive
2014 / 34 / EU ATEX Guideline for use in potentially explosive atmospheres,
Appendix III (at types MPC only)
The CE sign is located on the rating plate. Observe the binding national and local regulations
when fitting the pump into installations!
Our products are sold worldwide and can therefore be equipped with the typical national
plugs and for the various voltages. You will find more information about the available pump
designs on our web page in the internet.
1.2 Target Groups
This Operating Manual is intended for the personnel planning, operating and maintaining
Diaphragm Pumps.
This group of people includes:
Designers and fitters of vacuum apparatus
Employees working on commercial laboratory and industrial vacuum technology applica-
tions
Service personnel for diaphragm pumps
The personnel operating and maintaining the diaphragm pumps must have the technical
competence required to perform the work that has to be done. The user must authorize the
operating personnel to do the work that has to be done. The personnel must have read and
understood the complete Operating Manual before using the diaphragm pumps.
The Operating Manual must be kept at the place of use and be available to the personnel
when required.
1.3 Intended Use
The layout of the diaphragm pump must be appropriate for the conditions of use. The
user bears the sole responsibility for this.
The diaphragm pump may only be operated under the conditions stated
–in the "Technical Data" section,
–on the type plate, and
–in the technical specification for the order concerned.
Diaphragm pumps are approved for extracting, pumping and compressing gases and va-
pours. If these gases and vapours are toxic or explosive, then the user must observe the
currently valid safety regulations for this application. Special types of diaphragm pumps
are available for aggressive and explosive gas mixtures.
1.4 Use for an Unauthorized Purpose
It is forbidden to use the pump for applications deviating from the technical data stated on
the type plate or the conditions stated in the supply contract, or to operate it with missing or
defective protective devices.

Important Information
412721 5
1.5 Safety Devices
Measures such as the following are for the safety of the operating personnel:
electrical connection with a protective conductor (operating mode S1) and an earthing
plug
Motor protection device (thermal)
“Hot Surface" label on the pump body - warning notice
The diaphragm pump must not be operated without these elements.
1.6 Meaning of the Warning notes
Take note of the warning notices. They are in the following box:
CAUTION ! / WARNING !
Hazard which may lead to serious injuries or material damage.
1.7 Product Standards, Safety Regulations
Diaphragm Pumps meet the following product standards:
DIN EN ISO 12100:2011-03
Safety of machinery -
General principles for design - Risk assessment and risk reduction
DIN EN ISO 13857:2008-06
Safety of machinery - Safety distances to prevent hazard zones being reached
by upper and lower limbs
DIN EN 1012-2:2011-12
Compressors and vacuum pumps - Safety requirements -
Part 2: Vacuum pumps
DIN EN ISO 2151:2009-01
Acoustics - Noise test code for compressors and vacuum pumps - Engineering
method (grade 2)
DIN EN ISO 2151:2009-01
Safety of machinery - Electrical equipment of machines -
Part 1: General requirements
DIN EN 61000-6-2:2011-06
DIN EN 61000-6-4:2011-09
Electromagnetic compatibility (EMC) -
Part 6-2: Generic standards - Immunity for industrial environments
Part 6-4: Generic standards - Emission standard for industrial environments
DIN EN 61010-1/A1:2015-04
Safety requirements for electrical equipment for measurement, control and
laboratory use - Part 1: General requirements
DIN EN 50110-1:2014-02
Operation of electrical installations
DIN EN 1127-1:2011-10
Explosive atmospheres - Explosion prevention and protection -
Part 1: Basic concepts and methodology
DIN EN 13463-1:2009-07
DIN EN 13463-5:2011-10
Non-electrical equipment for use in potentially explosive atmospheres -
Part 1: Basic method and requirements
Part 5: Protection by constructional safety 'c'
Directive 2012/19/EU
Electrical and electronics - old devices (WEEE)
Directive 2011/65/EUDangerous materials in electrical and electronics devices (RoHS II)
China - RoHS II Environment protection law - China 2016-01
The following additional safety regulations apply in the FR Germany:
BGV A3
Electrical equipment and operating materials
VBG 5
Power-driven machines
BGR 120
Guidelines for laboratories
BGI 798
Hazard assessment in the laboratory
BGG 919 (VBG 16)
Accident prevention regulations for "compressors"
BGR 189 (BGR 195;192;197)
Use of protective working clothes
Observe the standards and regulations applying in your country when you use the dia-
phragm pumps.

Basic Safety Instructions
6 412721
2 Basic Safety Instructions
2.1 General Information
Warning notices must be observed. Disregarding them may lead to damage to health and
property.
The diaphragm pumps must be operated by personnel who can detect impending dangers
and take action to prevent them from materialising.
The manufacturer or authorized authorised workshops will only service or maintain the dia-
phragm pump if it is accompanied by a fully completed damage report. Precise information
about the contamination (also negative information if necessary) and thorough cleaning of
the diaphragm pump are legally binding parts of the contract.
Contaminated diaphragm pumps and their individual parts must be disposed of in accor-
dance with the legal regulations.
The local regulations apply in foreign countries.
2.2 Electricity
The diaphragm pumps of operation mode S1 are supplied. When the location of operation
mode S1 devices is changed, please note that the testing must be repeated in accordance
with DIN EN 0105, DIN EN 0702 and BGV A2.
The local regulations apply in foreign countries.
Please note the following when connecting to the electrical power supply system:
The electrical power supply system must have a protective connector according to DIN
VDE 0100-410 (IEC 60364-4-41).
The protective connector must not have any breaks.
The connecting cable must not be damaged.
2.3 Mechanical Systems
Improper use can lead to injuries or material damage. Observe the following instructions:
Only operate the diaphragm pumps with hoses of the specified dimensions.
The maximum permissible pressure of 1 bar at the suction connection must not be ex-
ceeded.
Hazardous substances must be separated out as far as this is technically possible before
they reach the pump.
External mechanical stresses and vibrations must not be transmitted to the pump. Only
use flexible laboratory hoses for connecting diaphragm pumps.
The overpressure generated at the pressure port must not exceed 1 bar.
The pump must not be used to suck up fluids. Lay the exhaust pipe so that it slopes
downwards, so allowing condensate to flow out of the pump. Collect the condensate and
dispose of it in an environmentally compatible manner.
Prevent dyes exuding.
Maintain a space of least 20 mm between the pump and adjacent parts in order to enable
the pump to cool.
CAUTION !
Solid particles in the pumping medium impair the pumping action and can lead to
damage. Prevent solid particles penetrating into the pump.

Basic Safety Instructions
412721 7
2.4 Hazardous Substances
The operating company bears the responsibility for the use of the diaphragm pump.
Hazardous substances in the gases to be pumped can cause personal injuries and property
damage. Pay attention to the warning notices for handling hazardous substances.
The local regulations apply in foreign countries.
Combustible Gases
Examine before switching on whether that can form gas combustible gas/air mixtures which
can be promoted! Consider the regulations of the guideline 1999/92/EC.
Explosive gases
The diaphragm pumps of the series MPC are certified according to ATEX guidelines
2014/34/EU, device category 3, valid for the gas contacting parts (interior) of the pump.
The diaphragm pumps of the series MP are not certified according to ATEX guidelines
2014/34/EU.
Aggressive gases
The MPC series is designed for extracting contaminated gases!
The use of diaphragm pumps of the series MP cannot be recommended for such cases of
application!
Especially aggressive gases have to be explicitly checked for material resistance as de-
scribed in chapter 3.6 and, if necessary, modified.
Poisonous gases
Use a separator when pumping poisonous or harmful gases. Prevent such substances from
leaking out of the appliance or pump. Treat these substances according to the applicable
environmental protection regulations.
Test the strength and leak-tightness of the connecting lines and the connected apparatus.
Prevent environmental poisons, e.g. mercury, getting into the diaphragm pumps.
Fulfil the requirements, for example:
German Hazardous Substances Regulation (GefStoffV) of 01. December 2010
Regulation 2016/1179/EU
(Classification, Packaging and Labelling of hazardous substances),
Manufacturer's safety data sheets on hazardous substances.
2.5 High Temperatures
The diaphragm pump may heat up as a result of the temperature of the gas being pumped
and through compression heat.
Prevent the following maximum permissible temperatures from being exceeded.
+ 40 °C for the environment, and
+ 60 °C for the gas to be pumped.
The motor for single phase alternating current is protected against overload by an integrated
motor protection switch.

Description
8 412721
3 Description
3.1 Design
The diaphragm pump consists of a pump body
and a drive motor.
The pump casing contains the drive unit and two
pump heads. Each pump head contains a dia-
phragm and the work valves. Both pump heads
are arranged opposite each other.
The pump heads are driven via an eccentric shaft
with a connecting rod.
1 to 2 stage pumps are supplied, depending upon
the circuitry of the pump heads.
Fig. 1 Diaphragm pump MP 601 E
3.2 Principle of Operation
Motor, eccentric shaft and connecting rod set the diaphragms in stroke movement. This
changes the size of the space between the diaphragms and pump head (pump chamber).
Increasing the size of the pump chamber opens the inlet valve while the outlet valve is
closed (intake process).
Decreasing the size of the pump chamber ejects the gas through the outlet valve.
The valves are actuated by the gas being pumped. A large proportion of fluid in the dia-
phragm pump minimizes the pumping efficiency.
3.3 Gas ballast
When condensable vapours are pumped, they
may be compressed above the saturated vapour
pressure and condense.
Opening the gas ballast valve (A) in the
suction line allows air to flow into the pump cham-
ber. This prevents condensation and flushes the
pump clear.
Operation leads to increasing the ultimate pres-
sure and the operating temperature.
The gas ballast valve is only provided as standard
for MPC type diaphragm pumps. The fitting into
other pump types is an option or must be specified
in the supply contract.
Fig. 2 Gas ballast valve on the
MPC 301 Z
3.4 Areas of Application
Diaphragm Pumps are intended to:
Pumping and compressing neutral and aggressive gases and vapours.
Generating a vacuum down to an ultimate pressure < 8 mbar.
Use in physical and chemical laboratories in trade and industry.
Use for vacuum filtration, vacuum distillation and vacuum drying, and other vacuum tech-
nology applications.
(A)

Description
412721 9
3.5 Pump head circuitry
One-stage (E):
Both pump heads are connected in parallel.
Ultimate pressure:
< 75 mbar
Models:
MP 601 E, MPC 601 E and MPC 601 E-X2
Two-stage (Z):
Both pump heads are connected in series.
Ultimate pressure:
< 8 mbar
Models:
MP 301 Z, MPC 301 Z and MPC 301 Z-X2
Special designs:
Special diaphragm pumps can be supplied after consultation with the manufacturer or for
a corresponding supply contract.
Explosion protection motors.
Motors for different voltages.
3.6 Materials of the medium-affecting pump parts
Component
Standard design
Chemical model
(resistant to aggressive gases)
MP
MPC
MPC - X2
Seal
EPDM
EPDM
FFKM, PTFE
Screw fitting /
Connecting element
PA, PP
PP, PVDF
PVDF
Valve
PEEK
PEEK
PFA
Diaphragm
Elastomer +
PTFE Layer
Elastomer +
PTFE Layer
PTFE mod.
Vacuum hose
PTFE
PTFE
Connection head / Pump head
Aluminium
PTFE with carbon-fibre reinforcing *)
*) electrically conductive (with manufacturer's certificate of electrical conductivity)
Material resistance to aggressive media see: Publisher Hoppenstedt Publishing (18. September 2007)
3.7 Scope of Delivery
The scope of delivery is specified in the supply contract.
3.8 Accessories
Designation
Usage
Order no.
Vacuum Control Box
VCB 521 cv
for measuring and regulation of vacuum
600053
Vacuum Regulator
with dial gauge DBR-A
for intake allows the adjustment of the
ultimate pressure
700458
Gas ballast valve
for diaphragm pumps of type MP…,
manually operated
400599-02
Mains connection cable
IEC with plug type 12 (CH)
for diaphragm pumps of MP/MPC in 230 V
825877

Description
10 412721
3.8.1 Connection variants A –K
Into the connection head with PTFE-insert one can screw only parts with extension
ø15 - 12 long and for thread in M12x1.
To all distributors only screw connections with G1/4 are screwed. Into the small flange
DN16KF additionally e.g. a hose nozzle with connection G 1/4" can be screwed in.
Variant
Figure with item no.
Variant
Figure with item no.
A
B
C
D
E
F
G
H
I
J
K
G
Item
no.
Order no.
Designation
Material
Dimensions
Fig. in
Variant:
1
829972
Threaded elbow joint
PVDF
M12 x 1; 10
G
2
710798-04
Hose nozzle
PP
M12 x 1; DN 8
G
3
400905
Manifold 1
PP
M12 x 1; 1x G ¼ inch
F
4
400903
Manifold 2
PP
M12 x 1; 2x G ¼ inch; L
C, D, E
5
710957
Adapter
PP
M12 x 1; G ¼ inch
A
6
400933
Manifold 8
PP
M12 x 1; 2x G ¼ inch; L upward
K
7
400917-01
Manifold 5
PP
M12 x 1; 1x G ¼ inch; DN 16 KF
I, J
8
400911
Manifold 4
PP
M12 x 1; 2x G ¼ inch; I
H
9
829217-3
O-ring
EPDM
ø12 x 2
all
10
829931
Straight threaded joint with
seal edge
PVDF
10 -¼ inch
C, D, E, H,
I, K
11
710798
Hose nozzle
PP
G ¼ inch; DN 8
E, F, J, K
12
710116
Threaded flange
PP
G ¼ inch; DN 16 KF
H
13
400568
Blind plug
PP
G ¼ inch
J
14
829901
Exhaust silencer
PA
G ¼ inch
D,
15
400941
Exhaust silencer
PP / PA
A - 10
C
16
400596
Exhaust silencer
PA
M12 x 1 male thread
B

Technical Data
412721 11
4 Technical Data
4.1 Dimensions
The main dimensions are identical for all pump types stated here.
(1)
Gas ballast valve
For type MPC only
(2)
Intake port
Small flange DN 16 KF (hose nozzle DN 8 for fitting. enclosed))
(3)
Pressure port
Hose nozzle DN 8
Fig. 3 Dimensions (type MPC 301 Z)
4.2 Intake Pressure / Pumping Speed –Diagram
Fig. 4 Intake Pressure / Pumping Speed - Diagram

Technical Data
12 412721
4.3 Device Data
Parameter
Unit
Diaphragm pump types
MP 601 E
(single-stage)
MPC 601 E
(single-stage)
MP 301 Z
(two-stage)
MPC 301 Z
(two-stage)
Pumping speed 50/60 Hz
DIN 28432
at speed of 1500 rpm
m3/ h
3.8 / 4.2
2.3 / 2.5
l / min
63 / 70
38 / 42
Ultimate pressure
at speed of 1500 rpm
mbar
75
8
Ultimate pressure
with gas ballast
(with MPC only) at speed of 1500 rpm
-
90
-
18
Max. inlet pressure
bar
1
Max. outlet pressure
1
Intake port
-
Small flange DN 16 KF
optional
Hose nozzle DN 8 for hose inside diameter 8 mm
Exhaust port
Hose nozzle DN 8 for hose inside diameter 8 mm
Ambient temperature
°C
+ 10 to + 40
Max. operating gas temperature
+ 60
Bearing
-
maintenance-free
Reference surface sound
pressure level
DIN EN ISO 2151
dB (A)
44
Voltage
V
230; 115; 230/400
(generally with motor protection switch, switch and cable)
Frequency
Hz
50 / 60
Power
W
180
Operating mode
-
S 1
Type of protection
DIN EN 60529
IP 54
Motor / Class of insulation
DIN EN 600034-1
F (160°C)
Type Examination Certificate no.
(at MPC only)
-
WELCH_ATEX_03-01
Designation EX (at MPC only)
II3G IIC T3 X (internal Atm. only)
Weight
kg
11.2
Dimensions (W/D/H)
mm
230 / 265 / 170
Order numbers for :
-
- Diaphragm pump (230V)
inclusive mains connection cables
with plug CEE, UK
411721
412721
411722
412722
- Diaphragm pump - X2 (230V)
inclusive mains connection cables
with plug CEE, UK
-
412721-03
-
412722-17
- Diaphragm pump (115V)
inclusive mains connection cable
with plug US
411721-01
412721-01
411722-01
412722-01
- Diaphragm pump (230/400V)
inclusive mains connection cable
with plug CEE
411721-02
412721-02
411722-02
412722-02
- Diaphragm pump - X2 (230/400V)
inclusive mains connection cable
with plug CEE
-
412721-04
-
-
The information presented in this material is based on technical data and test results of nominal units. It is believed
to be accurate and reliable and is offered as and aid to help in the selection of products.
It is the responsibility of the user to determine the suitability of the product for the intended use and the user as-
sumes all risk and liability whatsoever in connection therewith. Gardner Denver Thomas GmbH does not warrant,
guarantee or assume any obligation or liability in connection with this information.

Installation and Operation
412721 13
5 Installation and Operation
5.1 Unpacking
Carefully unpack the diaphragm pump.
Check the pump for:
Transport damage,
Conformity with the specifications of the supply contract (type, electrical supply data),
Completeness of the delivery.
Please inform us without delay if there are discrepancies between the delivery and the con-
tractually agreed scope of delivery, or if damage is detected.
Please take note of the general terms of business of the manufacturing firm.
In case of a claim under warranty, the device must be returned in packaging that is
suitable for protecting it during transport.
5.2 Installation and Connection
1. Set the diaphragm pump on a flat and horizontal surface.
2. Remove the protective caps on the suction and pressure ports.
3. Prepare the connections.
4. Connect the vacuum connector to the suction port.
5. Connect the exhaust pipe to the pressure connection.
6. Connect the diaphragm pump to the electrical supply.
5.3 Operation
Observe the basic safety instructions when using the pump.
The diaphragm pump is switched on and off at the operating switch.
The operating company must install a main switch for pumps with terminal boxes.
5.4 Storage
The pumps are to be stored in a low-dust, interior room within the temperature range from
+ 5 to + 40 °C and at a relative air humidity < 90%.
Leave the protective elements on the suction and pressure ports. Another equally good pro-
tection may be used.
5.5 Scrap Disposal
CAUTION !
The diaphragm pumps must be disposed of in accordance with the 2012/19/EU
guideline and the specific national regulations.
Contaminated diaphragm pumps must be decontaminated according to the laws.

Maintenance and Servicing
14 412721
6 Maintenance and Servicing
6.1 General Requirements
Check the pump daily for unusual running noises and heat building up on the surface of
the pump.
We recommend changing the diaphragm after 10,000 operating hours. The user may
specify that the exchange be made earlier, depending upon the application process.
Check the electrical and vacuum connections daily.
6.2 Maintenance Performed by the User
WARNING !
Only perform the work that is described here, and that which is permitted to be done
by the user.
All other maintenance and service work may only be performed by the manufacturer
or a dealer authorized by him.
Beware of the pump parts being possibly contaminated by hazardous substances.
Wear protective clothing if there is contamination.
Scope of permissible work:
Loosen and remove the hoses
Open and remove the pump heads
Inspect the pump chambers, diaphragms and valves
Deposits in the inside of the pump must be cleaned out
Change the diaphragms, valves and seals
Tools required:
Tool kit: Order no. 402106, consists of:
Order no. 826801 Pin type face wrench, adjustable, size 3,
Order no. 826801-6 Allan key, size 4,
Order no. 826801-5 Open spanner, size 17.

Maintenance and Servicing
412721 15
6.2.1 Disassembly
1. Disconnect the power supply and ensure that it cannot be switched on again.
2. Open the screw clamps (9) of the hoses (10) on the pump body with the size 17 open
spanner.
3. Remove four machine screws (1) from each connection head with an Allan key, size 4.
4. Lift off the connection head (2) and the pump head (5). The valves (3), O-Rings (4) and
diaphragm (7) are now freely exposed.
5. Loosen the diaphragm (7) at the strain washer (6) by turning the size 3 pin type face
wrench anticlockwise.
6. Clean the valves (3), the pump head (5) and the diaphragm (7) with a soft cloth and ace-
tone.
7. Check that the drive is in good working order.
Fig. 5 Disassembly, assembly
WARNING !
Renew defective parts, if necessary! Wear protective gloves!
Parts must be renewed at the intervals stated in this Operating Manual or as speci-
fied by the user internally! Do not clean with compressed air!
6.2.2 Assembly (see Fig. 5)
1. Place the pump so that the diaphragm is lying in a horizontal position.
2. Use the size 3 pin-type face wrench to tighten the pressure disc (8), the diaphragm (7)
and the strain washer (6) with the correct torque of 5 - 6 Nm.
3. Bring the connecting rod (see fig. 6) and the diaphragm (7) into the central position.
4. Replace the pump head (5).
5. Insert the valves (3) and the O-Rings (4).
Ensure that they are lying completely flat. Do not insert the burred side facing the sealing
surface. Align the connection head flush with the pin.
6. Tighten the four machine screws (1) symmetrically with a torque of 3 - 4 Nm.
7. Reattach the hose connections (10) with clamping ring screw fittings (9).

Maintenance and Servicing
16 412721
6.2.3 Test
Connect a vacuum measuring device to the suction connector and measure the ultimate
pressure.
If the device is working properly, then the figure stated in the technical data must be at-
tained within a maximum of one minute.
The pump must not make any abnormal noises.
Moving parts must not touch each other.
6.3 Maintenance by the Manufacturer
Repairs and maintenance going beyond the extent of the work described in chapter 6.2 or
reconditioning or modification may only be performed by the manufacturer or authorized
workshops.
WARNING !
The user shall be liable for the consequences of an incorrect damage report or a
contaminated pump. The statements in the damage report are legally binding.
6.4 Damage Report
You find the form of the damage report to the Download on our web page in the menu "ser-
vice" and "Downloads". www.welchvacuum.com
If you should not have an entrance to the Internet, you can request the form also gladly with
us, under phone [phone].
WARNING !
Incomplete or incorrectly completed damage reports may endanger the service per-
sonnel!
Give full information in the damage report, in particular regarding a possible con-
taminating.

Troubleshooting
412721 17
7 Troubleshooting
During the warranty period, intervention in the diaphragm pumps and accessory components
may only be made by manufacturing firm.
Trouble
Cause
Remedy
by:
with:
Vacuum pump
does not start
No power supply
Qualified
electrician
Check electrical installation
Motor defective
Service
workshop
Exchange
Pump body defective
Repair and/or exchange
Vacuum pump
does not
generate a
vacuum or
only an
inadequate
one
Connected apparatus
and/or
connecting elements
leaking
User or
Service
workshop
Identify and seal the leak,
replace the seals and/or
hoses if necessary.
Vacuum pump leaking
Check the hose
connections between the
pump heads, replace the
hoses and/or fittings if
necessary.
Pump head leaking
Service
workshop
Repair and/or exchange
Diaphragm defective
User or
Service
workshop
Exchange of the diaphragm
(see chapter 6.2)
Valve defective
Exchange of the valve
(see chapter 6.2)
Vacuum pump dirty
General maintenance /
cleaning
Valves dirty
Cleaning condensates and
foreign objects out of the
valves.
Running noise
Vacuum pump dirty
User or
Service
workshop
General maintenance /
cleaning
Cable(s)
defective and/or brittle
Qualified
electrician
Exchange of the cable(s)

Spare Parts Overview
18 412721
8 Spare Parts Overview
The spare parts lists contain all the spare parts and all the information necessary for order-
ing.
When ordering, please quote the description, quantity, serial number and order number!
CAUTION !
We are not liable for any damage caused by the installation of any parts not supplied
by the manufacturer.
8.1 Service kit
Designation
Order no.
Service kit
for MP/MPC 601 E, MP/MPC 301 Z
402041
Service kit
for MPC 601 E - X2, MPC 301 Z - X2
402041-06
The Service kit consists of:
Designation
Piece
402041
402041-06
Order no.
Order no.
O-Ring ø 12 x 2
5
829217-3
-
O-Ring ø 25 x 2
4
829250-1
829250-4
Valve
4
400656
400656-3
Diaphragm
2
400732
400732-04
Caution, the number of supplied construction units in the maintenance set
corresponds to the maximum need of the series!

Spare Parts Overview
412721 19
8.2 Spare parts view
Fig. 6 Exploded view (MPC 301 Z)

Spare Parts Overview
20 412721
8.2.1 Spare parts list diaphragm pumps MP 601 E
Item
no.
Designation
Piece
MP 601 E
230 V
Order no.
411721
115 V
Order no.
411721-01
230 / 400 V
Order no.
411721-02
Order no.
Order no.
Order no.
- *)
Basic pump complete
(consisting of position: 1 –8)
1
410402
410402-01
410402-03
1
Pump casing
1
400640
400640
400640
2
Cover plate
1
400641-02
400641-02
400641-02
-
Drive complete
(consisting of position: 3 –7)
1
400843
400843
400843
3
Centrifugal mass
1
400649
400649
400649
4
Eccentric
1
400648
400648
400648
5
Close tolerance spacer 25 x 35 x 1
4
824957-1
824957-1
824957-1
6
Piston rod with ball bearing
2
400647-01
400647-01
400647-01
7
Mass balance
1
400678
400678
400678
8
Alternating-current motor
1
826420
826486-01
-
Three phase motor
1
-
-
826444
9
Handle
1
828634
828634
828634
10
Rubber metal-pad
2
829141-2
829141-2
829141-2
11
Spacer distance - Foot
2
400784-01
400784-01
400784-01
12
Rubber pad
1
400785-01
400785-01
400785-01
13
Pressure washer
2
400680
400680
400680
14
Diaphragm
2
400732
400732
400732
15
Tightening washer
2
400707
400707
400707
16
Pump head
2
400643-01
400643-01
400643-01
17
O-Ring EPDM, ø 25 x 2
4
829250-1
829250-1
829250-1
18
Valve
4
400656
400656
400656
19
Aluminium insert
2
400902-01
400902-01
400902-01
20
Connection head
2
410432
410432
410432
21
Manifold 5
1
400917-01
400917-01
400917-01
22
Manifold 2
1
400903
400903
400903
23
Hose nozzle PP, DN 8 - ¼“
(1x enclosed)
2
710798
710798
710798
24
Hose nozzle PP, DN 8 - M12 x 1
-
-
-
-
25
Straight threaded joint PA, 10 - ¼“
2
829931
829931
829931
26
Threaded elbow joint 10, PVDF, M12x1
2
829972
829972
829972
27
Vacuum hose PTFE 10 / 8 x 1 mm
0.4 m
828332
828332
828332
28
O-Ring EPDM, ø 12 x 2
4
829217-3
829217-3
829217-3
-
Exhaust silencer G¼“
1
829901
829901
829901
-
Mains connection cable IEC with plug
CEE (D)
1
825885
-
-
Mains connection cable IEC with plug
BS (UK)
1
825878
-
-
Mains connection cable IEC with plug
NEMA5-15 (US)
1
-
825903
-
CEE plug 5pole
1
-
-
825284
*) The "basic pump" module (items 1 –8) can only be supplied complete under order numbers
410402, 410402-01 or 410402-03.