BUSCH Dolphin User manual

Instruction Manual
Dolphin
Liquid Ring Vacuum Pumps
LM 0100 A, LM 0180 A, LM 0270 A, LM 0530 A, LM 0800 A,
LT 0130 A, LT 0170 A, LT 0220 A, LT 0320 A,
LT 0430 A, LT 0510 A, LT 0630 A, LT 0750 A
0870206545/-0001_en / Original instructions / Modifications reserved 01/03/2019
Busch GVT Ltd.
Unit A, Westmere Drive
Crewe, Cheshire CW1 6ZD
United Kingdom

Table of Contents
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Table of Contents
1 Safety........................................................................................................................... 3
2 Product Description ..................................................................................................... 4
2.1 Operating Principle............................................................................................... 5
2.2 Application ........................................................................................................... 5
2.3 Start Controls .......................................................................................................5
2.4 Variants................................................................................................................6
2.4.1 LM Series...................................................................................................6
2.4.2 LT Series ....................................................................................................6
2.4.3 VL System..................................................................................................6
3 Transport ..................................................................................................................... 7
4 Storage......................................................................................................................... 7
4.1 Short Term (Up to 3 Months) ............................................................................... 7
4.2 Medium Term (3 Months to 6 Months) ................................................................8
4.3 Long Term (Over 6 Months)................................................................................. 8
5 Installation................................................................................................................... 8
5.1 Installation Conditions .......................................................................................... 8
5.2 Connecting Lines / Pipes ......................................................................................9
5.2.1 Suction Connection....................................................................................9
5.2.2 Discharge Connection................................................................................9
5.2.3 Operating Liquid Connection.....................................................................10
5.3 Operating Liquid Settings ..................................................................................... 12
5.4 Fitting the Coupling.............................................................................................. 13
5.5 Electrical Connection ............................................................................................13
5.5.1 Wiring Diagram Three-Phase Motor ..........................................................14
6 Commissioning............................................................................................................ 15
6.1 Preventing Cavitation ........................................................................................... 16
7 Maintenance................................................................................................................ 16
7.1 Maintenance Schedule.......................................................................................... 17
8 Overhaul...................................................................................................................... 17
9 Decommissioning ........................................................................................................ 18
9.1 Dismantling and Disposal...................................................................................... 18
10 Spare Parts................................................................................................................... 18
11 Troubleshooting........................................................................................................... 20
12 Technical Data ............................................................................................................. 22
13 EU Declaration of Conformity ...................................................................................... 25

Safety | 1
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1 Safety
Prior to handling the machine, this instruction manual should be read and understood. If
anything needs to be clarified, please contact your Busch representative.
Read this manual carefully before use and keep for future reference.
This instruction manual remains valid as long as the customer does not change anything
on the product.
The machine is intended for industrial use. It must be handled only by technically trained
personnel.
Always wear appropriate personal protective equipment in accordance with the local
regulations.
The machine has been designed and manufactured according to state-of-the-art meth-
ods. Nevertheless, residual risks may remain. This instruction manual highlights potential
hazards where appropriate. Safety notes and warning messages are tagged with one of
the keywords DANGER, WARNING, CAUTION, NOTICE and NOTE as follows:
DANGER
... indicates an imminent dangerous situation that will result in death or serious injuries if
not prevented.
WARNING
... indicates a potentially dangerous situation that could result in death or serious injuries.
CAUTION
... indicates a potentially dangerous situation that could result in minor injuries.
NOTICE
... indicates a potentially dangerous situation that could result in damage to property.
NOTE
... indicates helpful tips and recommendations, as well as information for efficient and
trouble-free operation.

2 | Product Description
4 / 28 0870206545_LM_LT_-0001_IM_en
2 Product Description
NOTE
Technical term.
In this instruction manual, we consider that the term ‘machine’ refers to the ‘vacuum
pump’.
OUTIN
OPD
GRP*
GVC
Dolphin LM 0100-0800 A
Dolphin LT 0130-0750 A
GRPIN OUT
OPI2**
OPI1OPL
OPD
GVC
OPI1
OPL
NP
NP
CPC
GRP*
CPC Cavitation protection connection IN Suction connection
GRP* Grease point GVC Vacuum gauge or relief valve connection
NP Nameplate OPD Operating liquid drain
OPI Operating liquid inlet OPL Operating liquid level plug
OUT Discharge connection
* GRP available on LM 0800 A, LT 0630 A and LT 0750 A only
** OPI2 required for LM 0270 A, LM 0530 A and LM 0800 A only

Product Description | 2
0870206545_LM_LT_-0001_IM_en 5 / 28
2.1 Operating Principle
The machine works on the liquid ring principle.
An eccentrically mounted impeller rotates in a housing partially filled with operating li-
quid (usually water). The impeller blades dip into the fluid, and the centrifugal force ex-
erted by their rotation forms a so-called liquid ring within the housing. The pumped me-
dium is transported in the spaces between the blades and the liquid ring. The eccentric
rotation of the impeller alters the volume of these spaces, causing gas to be drawn in,
compressed and expelled.
2.2 Application
The machine is intended for the suction of air, vapour and other gases.
For explosive gases and vapours (if a "Ex(inside)" sign is written on the nameplate),
please refer to the ATEX supplement for additional safety information on operation in
hazardous zones.
Conveying of other media leads to an increased thermal and/or mechanical load on the
machine and is permissible only after a consultation with Busch.
The machine is intended for the placement in a non-potentially explosive environment
unless a "Ex(outside)" sign is written on the nameplate, in this case please refer to the
ATEX supplement for additional safety information.
The machine is capable of maintaining ultimate pressure, see Technical Data [►22].
The machine is suitable for continuous operation.
Permitted environmental conditions, see Technical Data [►22].
2.3 Start Controls
The machine comes without start controls. The control of the machine is to be provided
in the course of installation.

2 | Product Description
6 / 28 0870206545_LM_LT_-0001_IM_en
2.4 Variants
2.4.1 LM Series
Dolphin LMs are single-stage vacuum pumps and operate from atmospheric pressure to
130 hPa (mbar) ultimate pressure.
2.4.2 LT Series
Dolphin LTs are two-stage vacuum pumps and operate from atmospheric pressure to 33
hPa (mbar) ultimate pressure.
2.4.3 VL System
VL System consists of a Dolphin machine either LM or LT and an operating liquid supply
system.
Three different layouts are possible:
– Once through cooling / no recovery.
– Partial recovery (open circuit).
– Total recovery (closed circuit).
All of these arrangements have four basic elements:
– Source of the operating liquid (from the water main or reservoir).
– Regulating device to control flow of liquid.
– Means of stopping the flow when the machine is shut off (manual or with solenoid
valve).
– Means of separating the gas-liquid exhaust mixture to prevent the build-up of unne-
cessary back-pressure.
If the machine is equipped with a VL System (see reference on the nameplate):
• Consult the supplement to the instruction manual of the VL System for additional
information.

Transport | 3
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3 Transport
WARNING
Suspended load.
Risk of severe injury!
• Do not walk, stand or work under suspended loads.
60° max
60° max
Machine weight:
see the technical data or the nameplate
Dolphin LM or LT without motor
(bare shaft pump) Dolphin LM or LT with motor
Use appropriate slings
• Check the machine for transport damage.
If the machine is secured to a base plate:
• Remove the machine from the base plate.
4 Storage
NOTICE
Storage temperature below +5°C.
Risk of damage to the machine!
• Drain the operating liquid from the machine and the system before storage.
• Or add an anti-freeze solution.
After testing, all Busch Dolphin vacuum pumps are vented and drained. Pumps contain-
ing ferrous materials are preserved using a combined VPI (Vapour Phase Inhibitor) and
Contact Inhibitor Oil (Vaporol™ or equivalent) at a recommended concentration of 1
litre per m3.
4.1 Short Term (Up to 3 Months)
• Seal all apertures with adhesive tape or provided caps.
If possible:
• Store the machine indoors, dry, dust free and if possible in original packaging
preferably at temperatures between +5 … 55 °C.

5 | Installation
8 / 28 0870206545_LM_LT_-0001_IM_en
4.2 Medium Term (3 Months to 6 Months)
• Remove the shaft coupling guard (if not supplied as a bare shaft machine).
• Rotate the machine shaft by hand weekly to prevent bearing indentation.
• Leave the shaft at approximately 90 degrees to the original position, using a tempor-
ary mark on the shaft to assist.
• Replace the coupling guard, taking care to align correctly and ensure that all fasteners
are replaced and fully tightened.
4.3 Long Term (Over 6 Months)
If the machine is constructed in cast iron material:
• Fill the pump with a liquid preservative (e.g. ‘Shell Ensis Fluid’) to prevent the machine
from corroding.
• Remove the shaft coupling guard (if not supplied as a bare shaft machine).
• Rotate the machine shaft by hand weekly to prevent bearing indentation.
• Leave the shaft at approximately 90 degrees to the original position, using a tempor-
ary mark on the shaft to assist.
• Coat the exposed shaft ends and shaft coupling with wax preservative or heavy
grease.
• Replace the coupling guard, taking care to align correctly and ensure that all fasteners
are replaced and fully tightened.
5 Installation
5.1 Installation Conditions
NOTICE
Use of the machine outside of the permitted installation conditions.
Risk of premature failure!
Loss of efficiency!
• Take care that the installation conditions are fully complied with.
• Make sure that the environment of the machine is not potentially explosive.
If there is Ex(o) sign written on the nameplate:
• Please refer to the ATEX supplement for additional safety information.
• Make sure that the ambient conditions comply with the Technical Data [►22].
• Make sure that the environmental conditions comply with the protection class of the
motor and the electrical instruments.
• Make sure that the installation space or location is vented such that sufficient cooling
of the machine is provided.
• Make sure that cooling air inlets and outlets of the motor fan are not covered or ob-
structed and that the cooling air flow is not affected adversely in any other way.
• Make sure that enough space remains for maintenance work.
• Make sure that the machine is placed or mounted horizontally on a flat surface.
• Make sure that the machine is connected to an operating liquid system, see Operating
Liquid Connection [►10].

Installation | 5
0870206545_LM_LT_-0001_IM_en 9 / 28
• Make sure that all provided covers, guards, hoods, etc. are mounted.
In case of a machine delivery without motor:
• Make sure that the coupling is correctly aligned, see Fitting the Coupling [►13].
If the machine is installed at an altitude greater than 1000 meters above sea level:
• Contact your Busch representative, the motor should be derated or the ambient
temperature limited.
5.2 Connecting Lines / Pipes
• Remove all protective caps before installation.
• Make sure that the connection lines cause no stress on the machine‘s connection; if
necessary use flexible joints.
• Make sure that the line size of the connection lines over the entire length is at least as
large as the connections of the machine.
In case of very long connection lines it is advisable to use larger line sizes in order to
avoid a loss of efficiency. Seek advice from your Busch representative.
5.2.1 Suction Connection
NOTICE
Ingress of foreign objects.
Risk of damage to the machine!
If the inlet gas contains foreign solid particles:
• Install a suitable inlet screen (smaller than 0.1 mm mesh size) upstream of the ma-
chine.
Connection size:
– DN40 PN10 (for LM 0100-0270 A and LT 0130-0220 A)
– DN50 PN10 (for LM 0530 A and LT 0320-0510 A)
– DN65 PN10 (for LM 0800 A and LT 0630-0750 A)
5.2.2 Discharge Connection
NOTICE
Too high elevation or lack of separation.
Will cause back pressure and possible drive motor overload!
• The discharge piping should not exceed an elevation of more than 600 mm above the
discharge flange (OUT) of the machine until the liquid is separated.
Connection size:
– DN40 PN10 (for LM 0100-0270 A and LT 0130-0220 A)
– DN50 PN10 (for LM 0530 A and LT 0320-0510 A)
– DN65 PN10 (for LM 0800 A and LT 0630-0750 A)
• Make sure that the discharged gas will flow without obstruction. Do not shut off or
throttle the discharge line or use it as a pressurised air source.

5 | Installation
10 / 28 0870206545_LM_LT_-0001_IM_en
5.2.3 Operating Liquid Connection
The machine cannot be operated without an operating liquid system. The following dia-
grams show examples of typical installations. The actual scope of delivery is always con-
tractually agreed upon.
If the machine is equipped with a VL System (see reference on the nameplate):
• Consult the supplement to the instruction manual of the VL System for additional
information.
OPI2**GVC
Dolphin LM 0100-0800 A
Dolphin LT 0130-0750 A
OPI1
OPD GVCOPIOPL CPC
OPL OPD
CPC Cavitation protection connection GVC Vacuum gauge or relief valve connection
OPD Operating liquid drain OPI Operating liquid inlet
OPL Operating liquid level plug
** OPI2 required for LM 0270 A, LM 0530 A and LM 0800 A only
Connection size:
Machine type OPI1 OPI2 OPD OPL CPC GVC
LM 0100-0180 A G1/2 N/A G1/8 G1/4 N/A G1/4
LM 0270 A G1/2 G1/2 G1/8 G1/4 N/A G1/4
LM 0530 A G1 G1 G1/4 G3/4 N/A G3/4
LM 0800 A G1 G1 G1/2 G3/4 N/A G3/4
LT 0130-0220 A G1/2 N/A 2x G1/8 G1/4 G1/8 G1/4
LT 0320-0510 A G1 N/A 2x G1/4 G3/4 G1/4 G3/4
LT 0630-0750 A G1 N/A 2x G1/2 G3/4 G1/4 G3/4
• Make sure that the operating liquid complies with the requirements, see Operating Li-
quid Settings [►12].

Installation | 5
0870206545_LM_LT_-0001_IM_en 11 / 28
5.2.3.1 Once-Through Operation / No recovery
Process inlet
Operating liquid inlet
Gas discharge
Continuous flow liquid system does not recover the operating liquid which flows out
with the discharge gases.
5.2.3.2 Partial Recovery (Open Circuit)
Process inlet
Operating liquid inlet
Gas discharge
50% of operating liquid recovered
Partial recirculation liquid system reduces the consumption of fresh liquid by recovering
and recirculating 50% of the operating liquid.
5.2.3.3 Total Recovery (Closed Circuit)
Process inlet
Topping-up
operating liquid Heat exchanger
Cooling water inlet and outlet
Gas discharge
Total recirculation liquid system recovers all of the operating liquid which is cooled by a
heat exchanger.
The recommended maximum pressure drop across the total recirculation system heat ex-
changer is 150 mbar on the machine side.

5 | Installation
12 / 28 0870206545_LM_LT_-0001_IM_en
5.3 Operating Liquid Settings
The condition of both the operating liquid and the conveyed media depend on the phys-
ical conditions pressure and temperature.
At a very low pressures and sufficiently high temperatures the operating liquid can locally
transfer into the vapour phase, creating bubbles within the operating liquid. This process
is called “cavitation” and may deteriorate the machine and its performance, see Prevent-
ing Cavitation [►16].
Recommended operating liquid settings:
Fresh water flow rate
(once through operation only)
m3/h See Technical Data [►22]
Water pressure before flow regulation valve
(once through operation only)
bar 1
Max. allowable supply temperature °C 80
Max. allowable kinematic viscosity mm2/s 20
Consider the motor power for
anything other than water -
consult Busch.
Max. allowable particle size mm 0.1*
* For all operating systems make sure that no particles with a diameter larger than
0.1mm will intrude the machine, neither via the process gas nor via the operating li-
quid. Use suitable filtration as necessary.
The table below lists the recommended maximum levels of soluble compounds for use
with machine in cast iron construction.
Calcium carbonate mg/l (ppm) < 300**
PH value 6.5 … 9.5
Chloride mg/l (ppm) < 700
Sulphates mg/l (ppm) < 200
Nitrites mg/l (ppm) < 500***
Total dissolved solids mg/l (ppm) < 1000
** to prevent excessive built-up of scale
*** provided long period of exposure to stagnant water is not foreseen
NOTE
Stainless steel version.
Please note that machines in all stainless steel material offer higher levels of corrosion
resistance and are recommended for operation outside of the above limits, or where the
application is known to corrode cast iron.

Installation | 5
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5.4 Fitting the Coupling
WARNING
Unprotected coupling.
Risk of severe injury!
• Make sure that the coupling is protected by a cover or a guard.
In case of a machine delivery without motor:
• Fit a suitable coupling that matches with the machine and motor shaft size.
• Make sure that the coupling is sized to withstand the full motor torque.
• Make sure that the coupling is correctly aligned according to the coupling instructions.
• Install a protective cover or a guard.
Machine type Machine shaft size (mm)
LM 0100-0270 A 28
LM 0530-0800 A 38
LT 0130-0220 A 28
LT 0320-0750 A 38
5.5 Electrical Connection
DANGER
Live wires.
Risk of electrical shock.
• Electrical installation work must only be executed by qualified personnel.
• Make sure that the power supply for the motor is compatible with the data on the
nameplate of the motor.
• The electrical installation must comply with applicable national and international
standards.
• Provide a lockable disconnect switch on the power line so that the machine is com-
pletely secured during maintenance tasks.
• Provide an overload protection according to EN 60204-1 for the motor.
• Make sure that the motor of the machine will not be affected by electric or electro-
magnetic disturbance from the mains; if necessary seek advice from Busch.
• Connect the protective earth conductor.
• Electrically connect the motor.
NOTICE
The motor frequency is too low.
Loss of efficiency, not enough power to create the sealing liquid ring.
• The motor speed must always be higher than the minimum speeds shown in the
Technical Data [►22].

5 | Installation
14 / 28 0870206545_LM_LT_-0001_IM_en
NOTICE
Incorrect connection.
Risk of damage to the motor!
• The wiring diagrams given below are typical. Check the inside of the terminal box for
motor connection instructions/diagrams.
5.5.1 Wiring Diagram Three-Phase Motor
Delta connection (low voltage): Star connection (high voltage):
Double star connection, multi-voltage
motor with 9 pins (low voltage):
Star connection, multi-voltage motor
with 9 pins (high voltage):
Double star connection, multi-voltage
motor with 12 pins (low voltage):
4
4
4
Star connection, multi-voltage motor
with 12 pins (high voltage):
4
4
4
Delta connection, multi-voltage motor
with 12 pins (middle voltage):
4
4
4

Commissioning | 6
0870206545_LM_LT_-0001_IM_en 15 / 28
NOTICE
Incorrect direction of rotation.
Risk of damage to the vacuum system!
• Operating the vacuum system with the rotation in the wrong direction can result in
the operating liquid flowing back to the vacuum system. Prior to start-up, check for
correct direction of rotation.
The intended rotation direction of the motor is defined by the illustration below:
IN
OUT
• Watch the fan wheel of the motor and determine the direction of rotation just before
the fan wheel stops.
If the rotation of the motor must be changed:
• Switch any two of the motor phase wires.
6 Commissioning
CAUTION
During operation the surface of the machine may reach temperatures of more than
70°C.
Risk of burns!
• Avoid contact with the machine during and directly after operation.
NOTICE
The machine is running without operating liquid system.
Will ruin the machine in short time!
• Prior to commissioning, the operating liquid system must be connected and open.
• Make sure that the installation conditions (see Installation Conditions [►8]) are met.
Before operating the machine:
• Make sure that the operating liquid level is at the machine shaft centre.
• Check the operation of all automatic valves before start up
• Switch on the machine.
• Make sure that the maximum permissible number of starts does not exceed 12 starts
per hour. Those starts should be spread within the hour.
After a few seconds of operation:
• Turn on/activate the operating liquid system device.
• Make sure that the operating conditions comply with the Technical Data [►22].
As soon as the machine is operated under normal operating conditions:
• Measure the motor current and record it as reference for future maintenance and
troubleshooting work.

7 | Maintenance
16 / 28 0870206545_LM_LT_-0001_IM_en
6.1 Preventing Cavitation
NOTICE
Cavitation.
Risk of damage to the machine!
If you hear crackling noise:
• Control the pressure.
At very low pressures and sufficiently high temperatures the operating liquid can locally
transfer into the vapour phase, creating bubbles within the operating liquid. As the pres-
sure rises towards the outlet slot the bubbles collapse. This process is called cavitation.
In case of bubbles that have been located on surfaces the operating liquid cannot intrude
the cavity left by the bubble equally from all directions. Instead the inflowing liquid hits
the surface with high speed. This causes erosion, which can destroy the machine rapidly.
The formation of bubbles also deteriorates the pump performance. Cavitation is clearly
audible by its crackling noise.
The working pressure of the vacuum pump shall therefore be sufficiently above the va-
pour pressure of the operating liquid. In particular the pressure control in the vacuum
system must by no means be achieved by throttling or even closing of the suction line!
The vapour pressure of the operating liquid and consequently the ultimate pressure can
be reduced by cooling. However, this increases the cooling water flow considerably. In
most cases the low ultimate pressure is not required and cavitation shall be avoided by
means of vacuum limitation rather than cooling.
7 Maintenance
WARNING
Machines contaminated with hazardous material.
Risk of poisoning!
Risk of infection!
If the machine is contaminated with hazardous material:
• Wear appropriate personal protective equipment.
CAUTION
Hot surface.
Risk of burns!
• Prior to any action requiring touching the machine, let the machine cool down first.
• Shut down the machine and lock against inadvertent start up.
• Turn off the operating liquid system.
• Vent the connected lines to atmospheric pressure.
If necessary:
• Drain the operating liquid
• Disconnect all connections

Overhaul | 8
0870206545_LM_LT_-0001_IM_en 17 / 28
7.1 Maintenance Schedule
The maintenance intervals depend very much on the individual operating conditions. The
intervals given below are desired to be considered as starting values which should be
shortened or extended as appropriate. Particularly harsh applications or heavy duty oper-
ation, such as high dust loads in the environment or in the process gas, other contamina-
tion or ingress of process material, can make it necessary to shorten the maintenance in-
tervals significantly.
Interval Maintenance work
Monthly • Check for abnormal noise, see Troubleshooting
[►20].
• Check for excessive vibration, see Operating Condi-
tions.
• Check the operating liquid temperature, see Operat-
ing Liquid Connection [►10].
• Check the machine for liquid leaks - in case of leaks
have the machine repaired (contact Busch).
Every 1000 operating hours* • Regrease the bearings (add 15g of lithium based
grease NLGI class 2 to each bearing).
Every year • Carry out a visual inspection on the machine to check
for dust and dirt. Avoid using any cleaning products
which may result in damage to the pump label or
paint.
If an inlet screen is installed:
• Check it and clean if necessary.
Every 5 years • Have a major overhaul (contact Busch).
* For Dolphin LM 0800 A, LT 0630-0750 A only. Smaller Dolphin LM/LT use bearings
which are greased for life.
8 Overhaul
NOTICE
Improper assembly.
Risk of premature failure!
Loss of efficiency!
• It is highly recommended that any dismantling of the machine that goes beyond any-
thing that is described in this manual should be done through Busch.
WARNING
Machines contaminated with hazardous material.
Risk of poisoning!
Risk of infection!
If the machine is contaminated with hazardous material:
• Wear appropriate personal protective equipment.
In case of the machine having conveyed gas that was contaminated with foreign materi-
als which are dangerous to health:

9 | Decommissioning
18 / 28 0870206545_LM_LT_-0001_IM_en
• Decontaminate the machine as much as possible and state the contamination
status in a ‘Declaration of Contamination’.
Busch will only accept machines that come with a completely filled in and legally binding
signed ‘Declaration of Contamination’.
(Form downloadable from www.buschvacuum.com)
9 Decommissioning
• Shut down the machine and lock against inadvertent start up.
• Vent the connected lines to atmospheric pressure.
• Disconnect all connections.
If the machine is going to be stored:
• See Storage.
9.1 Dismantling and Disposal
• Separate special waste from the machine.
• Dispose of special waste in compliance with applicable regulations.
• Dispose of the machine as scrap metal.
10 Spare Parts
NOTICE
Use of non-Busch genuine spare parts.
Risk of premature failure!
Loss of efficiency!
• The exclusive use of Busch genuine spare parts and consumables is recommended for
the correct functioning of the machine and to validate the warranty.
Spare parts kit Description Part no.
Service kit for:
LM 0100 A
LM 0180 A
LM 0270 A
LT 0130 A
LT 0170 A
LT 0220 A
Intended for standard applications
2x bearing ball
2x o-ring (Viton)
2x mechanical seal
1x locknut M30
0993 700 057
Service kit for:
LM 0100 A
LM 0180 A
LM 0270 A
LT 0130 A
LT 0170 A
LT 0220 A
Intended for chemical applications
2x bearing ball
2x o-ring (PTFE/Viton)
2x mechanical seal (Chemraz®)
1x locknut M30
0993 700 058
Service kit for:
LM 0530 A
Intended for standard applications
2x bearing ball
2x o-ring (Viton)
1x flat seal washer (nitrile)
2x mechanical seal
1x locknut M40
0993 700 078

Spare Parts | 10
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Spare parts kit Description Part no.
Service kit for:
LT 0320 A
LT 0430 A
LT 0510 A
Intended for standard applications
2x bearing ball
2x o-ring (Viton)
1x flat seal washer (nitrile)
2x mechanical seal
1x locknut M40
0993 700 059
Service kit for:
LM 0530 A
Intended for chemical applications
2x bearing ball
2x o-ring (PTFE/Viton)
1x flat seal washer (PTFE)
2x mechanical seal (Chemraz®)
1x locknut M40
0993 700 079
Service kit for:
LT 0320 A
LT 0430 A
LT 0510 A
Intended for chemical applications
2x bearing ball
2x o-ring (PTFE/Viton)
1x flat seal washer (PTFE)
2x mechanical seal (Chemraz®)
1x locknut M40
0993 700 060
Service kit for:
LM 0800 A
LT 0630 A
LT 0750 A
Intended for standard applications
1x bearing spherical roller
1x bearing spherical roller with adaptor
sleeve
2x o-ring (Viton)
1x flat seal washer (nitrile)
2x mechanical seal
1x locknut M45
3x oil seal
0993 700 061
Service kit for:
LM 0800 A
LT 0630 A
LT 0750 A
Intended for chemical applications
1x bearing spherical roller
1x bearing spherical roller with adaptor
sleeve
2x o-ring (PTFE/Viton)
1x flat seal washer (PTFE)
2x mechanical seal (Chemraz®)
1x locknut M45
3x oil seal
0993 700 062
If other parts are required:
• Contact your Busch representative for the detailed spare parts list.

11 | Troubleshooting
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11 Troubleshooting
Problem Possible Cause Remedy
The machine does not start. The motor is not supplied
with the correct voltage.
• Check the power supply.
Corrosion between the rotor
and the housing.
• Eliminate by use of anti-
corrosion liquid.
• Repair the machine (con-
tact Busch).
Solid foreign matter has
entered the machine.
• Remove the solid foreign
matter or repair the ma-
chine (contact Busch).
• Install an inlet screen if
necessary.
Ice in the machine, the oper-
ating liquid has frozen.
• Carefully warm up the
machine.
• Defrost the operating li-
quid.
The motor is defective. • Replace the motor.
The machine does not reach
the usual pressure on the
suction connection.
Suction or discharge lines
too long or section diameter
too small.
• Use larger diameter or
shorter lines.
• Seek advice from your
local Busch representa-
tive.
The operating liquid is too
warm.
(the characteristic curves are
based on 15°C warm water
as operating liquid, with
higher temperatures the
achieved pressure and the
flow rate deteriorate)
• Reduce the temperature
of the operating liquid.
The mechanical seal leaks. • Repair the machine (con-
tact Busch).
Partial clogging in the suc-
tion, discharge or pressure
line.
• Remove the blockage.
If an inlet screen is installed,
it can be partially clogged.
• Clean the inlet screen.
Internal parts are worn or
damaged.
• Repair the machine (con-
tact Busch).