Unibloc-Pump LABTOP 200 Series Operation manual

OPERATION AND SERVICE MANUAL
(SERIES 200-450)
ORIGINAL INSTRUCTIONS
UNI-202204

Page 3 of 4
Contents
PLEASE REGISTER YOUR LABTOP TO RECEIVE UP-TO-DATE SOFTWARE FOR CONTROLLER......................4
1.0 General.......................................................................................................................................................... 5
1.1Declaration of Conformity..............................................................................................................................5
1.2 General Description..............................................................................................................................................6
1.2.1 Limitation ..............................................................................................................................................................................7
1.2.2 Noise Emission......................................................................................................................................................................7
1.2.3 Marking – CE ........................................................................................................................................................................7
1.2.4 Marking – Standard ...............................................................................................................................................................7
2.0 Safety ............................................................................................................................................................. 8
2.1 General...................................................................................................................................................................8
2.3 Safety Instructions................................................................................................................................................8
3.0 Installation .................................................................................................................................................. 10
3.1 Handling and Storage.........................................................................................................................................10
3.2 System Design......................................................................................................................................................11
3.3 Flushed Seal Arrangement.................................................................................................................................11
3.3.1 Single and Double Mechanical Seal Flushing/Cooling........................................................................................................11
3.3.2 Double O-Ring Seal Flushing/Cooling................................................................................................................................13
3.4 Pre-Start Check List...........................................................................................................................................13
4.0 Maintenance................................................................................................................................................ 14
4.1 Clean In Place, CIP.............................................................................................................................................14
4.2 Steam In Place, SIP.............................................................................................................................................14
4.3 Maintenance Schedule and Recommended Spare Parts.................................................................................15
4.4 Shaft Seal Service................................................................................................................................................15
4.4.1 Single Mechanical Seal........................................................................................................................................................16
4.4.1.1 UNIBLOC-PD 200-275 Single Mechanical Seal Removal......................................................................................16
4.4.1.2 UNIBLOC-PD 200-275 Single Mechanical Seal Installation...................................................................................16
4.4.1.3 UNIBLOC3' 300-450 Single Mechanical Seal Removal.......................................................................................17
4.4.1.4 UNIBLOC3'300-450 Single Mechanical Seal Installation...................................................................................17
4.4.2 Flushed Single Mechanical Seal..........................................................................................................................................18
4.4.2.1 Flushed Single Mechanical Seal Removal................................................................................................................18
4.4.2.2 Flushed Single Mechanical Seal Installation ............................................................................................................18
4.4.3 Double Mechanical Seal......................................................................................................................................................19
4.4.3.1 Double Mechanical Seal Removal............................................................................................................................19
4.4.3.2 Double Mechanical Seal Installation ........................................................................................................................20
4.4.5 UNIBLOC3' 200-450 Seal Installation – Final Step........................................................................................................21
4.5 Pump Bearing Housing Service.........................................................................................................................22
4.5.1 Bearing housing Disassembly..............................................................................................................................................22
4.5.2 Bearing housing Assembly..................................................................................................................................................22
4.5.2.1 Pump Assembly - Stainless Steel Rotors..................................................................................................................22
4.5.2.2 Pump Assembly – Stainless Steel Rotors – Final Step .............................................................................................23
4.5.2.3 Pump Assembly – Polymer Rotors...........................................................................................................................23
4.7 Troubleshooting..................................................................................................................................................25

Page 4 of 4
5.0 Technical Data............................................................................................................................................ 27
5.1 General Dimensions and Weights .....................................................................................................................27
5.2 Lubricants and Bearing housing Oil Specification..........................................................................................27
5.3 Tools and Torque Requirements.......................................................................................................................29
5.3.1 Special Tools .......................................................................................................................................................................29
5.4 Rotor Clearances ................................................................................................................................................29
6.0 Pump Identification and Spare Parts......................................................................................................... 30
6.1 Pump Identification............................................................................................................................................30
7.0 Electronics/Operation................................................................................................................................. 31
7.1 Input Voltage.......................................................................................................................................................31
7.2 Ventilation...........................................................................................................................................................31
7.3 Fuse Replacement...............................................................................................................................................31
7.4 Unit Operation....................................................................................................................................................32
7.4.1 Digital Key Pad Operation...................................................................................................................................................33
7.4.2 Touch Screen Key Pad Operation........................................................................................................................................33
7.4.3 Controller Settings and Update............................................................................................................................................36
7.4.4 Remote Operation................................................................................................................................................................36
8.0 Warranty...................................................................................................................................................... 41
PLEASE REGISTER YOUR LABTOP TO RECEIVE UP-TO-DATE SOFTWARE FOR CONTROLLER.
REGISTRATION CAN BE DONE WITH ENCLOSED FORM OR FROM OUR WEBSITE
WWW.81,%/2&3803.COM
LABTOP SIZE:________________ PUMP S.N.: _________________ VFD S.N.:__________________

Page 5 of 41
1.0 General
1.1 Declaration of Conformity
Unibloc Hygienic Technologies, LLC
Q42.2101.1
EC DECLARATION OF CONFORMITY
We hereby declare that the following machinery is intended for installation into a machine or to be assembled with other
machines into a machine. It must not be put into service until the machinery into which it is incorporated has been
declared in conformity with the provisions of the Machinery Directive 2006/42/EC, 09/392/EEC, amendments
91/368/EEC, 93/44/EEC, 93/68/EEC.
Manufacturer
Manufacturer
1650 Airport Road
Kennesaw, GA 30144
USA
UNIBLOC-RH GmbH
Stromberger Strasse 197
Beckum 59269
Germany
Machine Description: Rotary Lobe Pump
Type: UNIBLOC-PD
UNIBLOC-GP
Size: PD200-677
GP200-450
Serial Number: *****
These machines have been designed and manufactured in accordance with the following transposed harmonized European
Standards.
EN292 Parts 1 and 2: 1991 Safety of Machinery – Basic Concepts, general principles for design.
EN294: 1992 Safety distances to prevent danger zones being reached by the upper limbs. .
Amendment: CR NO 2023/2006: GMP for materials and articles in contact with food
Amendment: EC NO 1935/2004: Materials and articles in contact with food
Amendment: CR NO 10/2011: Plastic materials and articles in contact with food
A technical construction file for this machinery is retained at the above address.
Signed: . Date: January 12, 2021
Bhavesh Patel, Operations Manager

Page 6 of 4
1.2 General Description
LABTOP® Pump System features UNIBLOC®-PD and is a positive displacement rotary lobe pump. It is be supplied with a
drive unit and controller within common Stainless Canopy (figure 1.0). UNIBLOC-PD can be supplied in the 5000 series with
stainless steel bearing housing. Different models are available from each series. Table 1.0 shows the pump bearing housing and
model relation. The Pump Models 200-0 - 275 are available in Vertical Position, Pump Models 300-350 are available in
Horizontal Position and Pump Models 400-450 are available in either Vertical or Horizontal Position. The orientation can be
modified using either a foot for horizontal or pedestal for vertical. Port orientation should be specified when ordering.
Figure 1.0
Bearing
housing Pump Model Bearing housing Pump Model Bearing housing Pump Model
200 Size
200 Size
200 Size
200 Size
200-0
200
250
275
300 Size
300 Size 300 350 400 Size 400 Size 400 450
Table 1.0
The LABTOP Model 200-0-275 is equipped in the Vertical Mounting position. The LABTOP Model 300-350 is equipped in the
Horizontal Mounting position. The LABTOP Model 400-450 is equipped in either Horizontal or Vertical Mounting positions.
The pump is designed to operate in both directions without modifications. See figure 1.2
PRODUCT
FLOW PRODUCT FLOW
Figure 1.2

Page 7 of 4
1.2.1 Limitation
The pump should be used for the duty for which it has been specified. The operating pressure, speed and temperature limits have
been selected at the time of order and MUST BE ADHERED TO. These details are stated on the original order documentation. If
not available, documentation may be obtained from your supplier by referencing the pump serial number and/or invoice number.
1.2.2 Noise Emission
Under certain operating conditions, pumps and/or drives and/or the systems within which they are installed can produce sound
pressure levels that exceed 80dB. In such cases ear protection should be used.
1.2.3 Marking – CE
Figure 1.3 shows the tag that is attached on the pump bearing housing.
If the tag were to be lost for any reason you can find the pumps serial number
machined on the side of the bearing housing. See figure 1.4
Always state the pump model and/or serial number when asking for assistance.
1.2.4 Marking – Standard
Standard marking is machined on the side of pumps’ bearing housing.
See figure 1.4 for details. Pump size is machined on rotor housing next to the ports. Figure 1.3
Figure 1.4

Instruction Manual LABTOP 200-450 20120911_Revision - for USA Page 8 of 4
2.0 Safety
2.1 General
This information must be read carefully before installation, operation or servicing. The safety instruction must always be
available for the pump operator. The following symbols are used.
WARNING: Indicates instructions that can affect personal safety if not followed.
WARNING: Indicates electrical voltage instructions that can affect personal safety if not followed.
ATTENTION: Indicates instructions to be considered for safe operation and to protect the pump and pump unit.
2.3 Safety Instructions
Incorrect installation, operation or maintenance of the equipment can cause serious personal injury and/or damage to the
equipment and will invalidate the warranty. Make sure the pipes are well supported as the pump is not meant to serve
this purpose. Keep in mind that pipes filled with liquid are very heavy. See figure 2.3.1 for recommended pipe layout.
Figure 2.3.1
Pump or pump assembly must be electrically connected by authorized personnel, follow the motor instructions supplied
in case of assembly.
Never operate the pump if the front cover and/or suction/discharge pipe-work are not in place. Make sure they are
properly installed, see figure 2.3.1. Likewise, never operate the pump if other protection such as coupling and shaft
guards are missing or incorrectly installed.
Never stick your appendages or other foreign objects inside the rotor housing, connections to the rotor housing, or in the
back cover if there is any possibility that the pump shafts may rotate.
Do not exceed the pump’s maximum operating pressure, speed or temperature. Do not modify the operating
parameters/system for which the unit was originally supplied for without first consulting your local supplier.
Pump installation and operation must always comply with prevailing health and safety regulations.

Page 9 of 4
Always make sure the alignment with the drive unit is within proper tolerances. Misalignment between the pump, drive
and coupling will result in premature wear, increased operating temperature and noisier environment.
See figure 2.3.2 for vertical misalignment: Place shims under pump or drive; 0.25mm (0.01inch) max deviation.
See figure 2.3.3 for horizontal misalignment: Move pump or drive horizontally; 0.25mm (0.01inch) max deviation.
See figure 2.3.4 for angular misalignment: Rotate pump or drive; 1° max deviation
Figure 2.3.2 Figure 2.3.3 Figure 2.3.4
Avoid any direct contact with hot surfaces of the pump or drive unit. If the surface temperature of the system exceeds
68°C, the system must be marked with a warning sign for “hot surface”.
ALWAYS DISCONNECT THE POWER SUPPLY when performing any kind of maintenance. Make sure the power
cannot be switched by locking it. Allow the pump and associated parts to cool down to a safe handling temperature.
Never operate the pump with either the suction side or the pressure side blocked.
Never operate the pump without the front cover installed properly
Always make sure any safety/relief valves are depressurized or relieved before dismantling.
Always ensure correct rotation of pump with flow direction before start.
Installation of safety equipment to prevent pump from exceeding maximum allowable pressure is
recommended. If an integrated safety relief valve is installed, do not allow extended periods of recirculation
through the valve. UNIBLOC-PUMP can either integrate a safety valve with the front cover, or supply one as a
separate unit. Please contact your supplier.
Installation of a non-return device is recommended to prevent reverse flow in the pump when it is being turned
off. UNIBLOC-PUMP can supply a check valve as non-returning device. Please contact your supplier.
Check the pump and motor assembly for adequate oil prior startup.
Make sure the pump and pipe systems are clean and free from debris or any foreign material before start up.
Do not install the pump into a system where it may run dry (i.e. without a supply of pumped media) unless it is
assembled with a flushed shaft seal that is properly installed with a fully operational flushing system.
Installation of pressure gauges/sensors in conjunction with the pump’s suction and discharge connections is
recommended to be able to monitor the pumps pressure.
When cleaning manually or by CIP, SIP methods, the operator must ensure that a suitable procedure is used in
accordance with the systems requirements.

Page 10 of 4
3.0 Installation
3.1 Handling and Storage
Caution must be taken when lifting the pump or pump unit. For all parts over 20kg we recommend the use of a lifting
device or lifting arrangement when unpacking or moving. Check the weight guide in section 5.0 for details. See figure
3.0 and 3.1 for lifting guidance.
LABTOP 200 Series LABTOP 300/400 Series
Figure 3.0 Figure 3.1
When you receive your product please follow these steps.
Check packaging for any damage in transit
Check the packing slip against received goods
If an assembly, make sure the manual for the drive unit is included
Visually inspect the product for any signs of damage
Report any damage immediately to the carrier
If installation of the pump is delayed, store and protect the unit properly by:
Not removing plastic port protectors.
Selecting a clean, dry storage location free from vibration. In a moist or dusty atmosphere, further protect the
pump/assembly with suitable cover.
Rotating the pump or pump assembly by hand every week, to prevent bearing damage.

Page 11 of 4
3.2 System Design
When a pump is to be incorporated in a system, it is considered good practice to minimize the length of the pipes and the number
of fittings and any other restrictions to product flow. Always consider the following when designing a system:
Confirm the Net Positive Suction Head-NPSH available from the system exceeds the NPSH required from the pump to
ensure smooth operation and avoid cavitation.
Avoid suction lifts and manifold/common suction lines for two pumps running in parallel, as this may cause vibration or
cavitation.
Protect the pump from unintended blockage from nuts, bolts, welding slag, etc, by installing a strainer. Also protect the
pump from unintended operation against a closed valve by installing a safety/pressure relief valve. Strainers and relief
valves can be provided by UNIBLOC-PUMP.
Install monitoring equipment on suction and pressure side of pump for diagnostic purposes.
Install shut-off valves on suction and pressure side to isolate pump when service is necessary.
Make sure the pipes are well supported. Do not use the pump to support the piping. See figure 2.3.1
Make the necessary piping arrangement if pump is supplied with a flushed seal or if the housing is jacketed for
heating/cooling.
Do not expose pump to rapid temperature changes, this may seize the pump as a result from thermal shock.
Allow at least 1m (3feet) free space around the pump for easy maintenance access.
Figure 3.2.1 shows a typical recommended design and required components for safe operation of the pump. All components are
available from UNIBLOC-PUMP. Contact your supplier.
Figure 3.2.1
3.3 Flushed Seal Arrangement
The flushed seal arrangement cools and lubricates the shaft seal area. All flushed seals must be installed in a proper system;
otherwise the seal will NOT OPERERATE CORRECTLY. The flushing system also works as a barrier between the environment
and the pumped media.
3.3.1 Single and Double Mechanical Seal Flushing/Cooling
Flushing systems are normally not included with the pump. Connections to the seal housings are 1/8” NPTF
It is important that:
The flush system is correctly installed and connected, see figure 3.3.1 and 3.3.2 for recommendations.
A compatible flushing fluid is used and supplied at the correct pressure and flow rate. If the discharge pressure
fluctuates set the pressure to suit maximum condition.
Double mechanical flushed seal pressure: 1bar (15psi) higher than the discharge pressure of the pump
Single mechanical with flushed housing max pressure: 0.5bar (7psi)
STRAINER
FLOW
SHUT OFF VALVE
PRESSURE RELIEF VALVE
PRESSURE GAUGE
FLOW

Page 12 of 4
Minimum flow rate required per seal: 1lpm (0.3gpm) or a rate that keeps seal temperature within 5°C (9°F)
It includes shut-off valves and check valves in the system so that the flush can be turned off and stop unwanted substance
from flowing in the wrong direction.
It includes monitoring equipment such as a pressure gauge in the system to ensure correct pressure is obtained.
The flushed fluid is flowing before or at the same time the pump is engaged, and turned off after or at the same time the
pump is disengaged.
VERTICAL PUMP PORTS
(recommended piping arrangement)
HORIZONTAL PUMP PORTS
(recommended piping arrangement)
FLUSH
OUTLET
PRESSURE
GAUGE
FLUSH
OUTLET
CONTROL VALVE
(i.e diaphragm valve) PRESSURE
GAUGE
FLUSH
INLET
CHECK
VALVE SHUT OFF
VALVE
CONTROL VALVE
(i.e diaphragm valve)
FLUSH
INLET
CHECK
VALVE
SHUT OFF
VALVE
Figure 3.3.1
FLUSH
OUTLET
CONTROL VALVE
(i.e diaphragm valve)
ALTERNATE PIPING ARRANGEMENTS
FLUSH
OUTLET PRESSURE
GAUGE
FLUSH
INLET
PRESSURE
GAUGE
SHUT OFF
VALVE
CHECK
VALVE
FLUSH
INLET
SHUT OFF
VALVE
CHECK
VALVE
CONTROL VALVE
(i.e diaphragm valve)
Figure 3.3.2

Page 13 of 4
3.3.2 Double O-Ring Seal Flushing/Cooling
The flushing system may be arranged the same as the double mechanical seals, shown in figure 3.3.1 and 3.3.2. The double o-
ring seals may also be lubricated with grease if the pump application justifies doing so. In this case, the seal flush chambers are
filled through grease nipples with approved grease that is suitable for use with the pumped media. The chambers must be filled
completely for proper operation. This can be accomplished by over pressurizing the chambers such that grease will be squeezed
out of the seals along the shafts and into the rotor housing. The amount of grease in the seal chambers must be monitored daily,
and if the pump is used in constant duty applications, it should be checked several times every 24 hour period.
3.4 Pre-Start Check List
Check the pipes to make sure they have been purged of debris.
Check all obstructions to make sure they have been removed from pipe or pump.
Check pump connections and make sure they are tight.
Check lubricant levels to make sure they are correct.
Check that safety guards are in place.
Check inlet and outlet valve to make sure they are open and functional.
Check the seal flushing is connected and activated, if applicable.

Page 14 of 4
4.0 Maintenance
BEFORE ANY MAINTENANCE TAKE PLACE: TURN OFF POWER SUPPLY TO THE MOTOR.
4.1 Clean In Place, CIP
The pump can be manually cleaned or by Cleaned In Place (CIP). The following is an example of suggested CIP procedure.
However, specific advice for each application can be obtained from your pump supplier.
If the temperature difference between the process liquid, or the pump, and the cleaning media is greater than 100C (180F), stop the
pump and then introduce the cleaning liquid. If the liquid is not gravity fed and the pump must draw the liquid from a supply
vessel, run the pump until it is filled and then stop. Allow the pump to adjust to the cleaning liquid temperature and then continue
running the pump at normal speed. If the pump has double mechanical seals, they must be continued to be flushed during the CIP
process. The length of time necessary to clean the pump and the type of liquid used is dependent on the type of process liquid and
its characteristics.
Never touch the pump or the pipelines as they can be extremely hot.
Always use rubber gloves and protective goggles if handling caustic substances.
The rotors and shaft seals in the pump have been selected for specific temperature and pressure conditions.
Verify with UNIBLOC-PUMP or the documentation supplied with the pump that the operating parameters are
not exceeded.
Always rinse well with clean water after using cleaning agent.
4.2 Steam In Place, SIP
The pump can be manually cleaned or cleaned with Steam In Place (SIP). Following is an example of suggested SIP procedure.
However, specific advice for each application can be obtained from your pump supplier.
Stop the pump and introduce steam into the system. If the pump must be operated, allow it to adjust to the steam temperature and
then run it between 50-100 rpm. If the pump has double mechanical seals, they must be continued to be flushed during the SIP
process. The length of time necessary to steam the pump is dependent on the type of process liquid used and its characteristics.
After the SIP process is complete, allow the pump to return to ambient temperature or to the temperature of the process liquid.
Resume normal operation to remove condensate or to begin pumping another media.
Never touch the pump or the pipelines as they can be extremely hot.
Always use rubber gloves and protective goggles if handling caustic substances.
The rotors and shaft seals in the pump have been selected for specific temperature and pressure conditions.
Verify with UNIBLOC-PUMP or the documentation supplied with the pump that the operating parameters are
not exceeded.
Always rinse well with clean water after using cleaning agent.

Page 15 of 4
4.3 Maintenance Schedule and Recommended Spare Parts
It is recommended to install pressure gauges on both sides of the pump so that any problems with the pump or pipelines can be
monitored. It is also recommended to have shut-off valves on both sides for easy isolation of pump if manual service is required.
The UNIBLOC bearing housing is supplied permanently lubricated with nitrile seals. However, for certain applications and at the
user’s request, drain plugs and a vent will be supplied. When applications exceed constant service temperatures of 1800C (3560F)
a vent and high temperature lubricant must be used. For such cases, contact UNIBLOC-PUMP or your supplier for an adequate
service schedule.
Recommended weekly maintenance control to include:
Control of oil levels in pump bearing housing and gear reducer. (Change once per year or after 2000 hours of operation,
whichever comes first)
Control of oil seal leakage
Control of shaft seal leakage
Control of pump medium leakage
Allow the pump to cool down after shut down prior to inspection.
Recommended spare parts
1 set of shaft seals Qty 2
1 set of front oil seals Qty 2
1 set of rear oil seals Qty 1
1 wet-end o-ring kit Qty 1 (5 o-rings)
4.4 Shaft Seal Service
DISENGAGE POWER TO THE MOTOR before proceeding with the following steps. If the pump is connected to
piping, depressurize the system and close valves on both the suction and discharge sides to isolate the pump from the rest
of the system. Disconnect the piping from the pump. If service is to be performed while the pump is still mounted to the
system, disconnect the motor drive coupling or the electrical connection to the motor.
To aid in the removal and installation of the shaft seals, use plastic mounting sleeves with the same diameter as
the shafts seal area. The sleeves also protect the seals from the shaft splines. They can be obtained from
UNIBLOC-PUMP. Contact your supplier for details.
Remove the front cover nuts (16) and the front cover (2). If the pump has polymer
rotors (3b) they can be removed by sliding them off the shafts. If the rotors are
stainless steel (3a), place a nonmetal object between the rotors to keep them from
turning. Unscrew the rotor bolts (14a) and then slide the rotors off the shafts. If the
rotors will not slide off they can be removed simultaneously with the rotor housing
(1). Unless they are being replaced, DO NOT USE PLIERS OR CHANNEL
LOCKS TO REMOVE THE ROTORS. They will be damaged. See the following
sections for further instructions to remove the rotor housing.
Figure 4.4.1

Page 16 of 4
4.4.1 Single Mechanical Seal
This type of shaft seal is used in most applications with products that have a viscosity of less than 1,000 cPs. The maximum
rotational speed of this seal is 1500 rpm and the maximum service pressure is 13.5 bar (195 psig). The seal materials available are
stainless steel, carbon, silicone carbide, and tungsten. The standard o-rings supplied in these seals are FDA-viton or FDA-EPDM.
These can be replaced with other materials upon request.
4.4.1.1 UNIBLOC-PD 200-275 Single Mechanical Seal Removal
Loosen and remove the acorn nuts from the Rotor Housing. Loosen the Threaded Studs by locking two M6 nuts against each
other on the exposed threaded stud ends. Remove the Rotor Housing by pulling on the ports or by tapping gently with a rubber
mallet. Do not rock the housing back and forth excessively. This can cause the seals to break. Remove the Stationary Seal Faces
and Stationary Seal O-Rings by pulling them out of the rotor housing. Remove the Rotating Seal Faces, the Rotating Seal O-
Rings, and Rotating Seal Washers by sliding them off the shafts. To avoid damage, carefully handle and store the loose
Stationary Seal Faces and the Rotating Seal Faces so that their lapped sealing surfaces do not get scratched.
4.4.1.2 UNIBLOC-PD 200-275 Single Mechanical Seal Installation
If missing, insert the Rotor Housing Pins into the rotor housing and the Shaft Pins into the shafts. Coat the shafts and rotor
housing bores with a product compatible lubricant. Place the Rotating Seal O-Rings in the Rotating Seal Face first, and then the
Rotating Seal Washers. Slide the Rotating Seal Rings, slotted side first, onto the shafts. Place the Wave Springs between the
Rotor Housing Pins. Place the Stationary Seal O-Rings in the groove of the Stationary Seal Faces. Align the slots of the
Stationary Seal Faces with the Rotor Housing Pins in the rotor housing. Push the Stationary Seal Faces into the rotor housing,
o-ring side first. Press several times to make sure they slide easily. Place a product compatible lubricant on the sealing surfaces.
Proceed to section 4.4.5 to complete the installation.
UNIBLOC-PD 200-275 with Single Mechanical Seals

Page 17 of 4
4.4.1.3 UNIBLOC 300-450 Single Mechanical Seal Removal
Loosen the Stud Nuts (item 43 in Figure 4.4.1). Remove the Rotor Housing by pulling on the ports or by tapping gently with a
rubber mallet. Do not rock the Rotor Housing back and forth excessively. The seals may break. The Seal Retaining Rings, the
Bolts, the Stationary Seal Faces, and the Stationary Seal O-Rings will all come off with the Rotor Housing. Unscrew the Bolts
to remove the Seal Retaining Rings, the Stationary Seal Faces, and the Stationary Seal O-Rings. Slide the Rotating Seal
Faces and the Rotating Seal O-Rings off the shafts. To avoid damage, handle and store the loose Stationary Seal Faces and
Rotating Seal Faces so that their lapped sealing surfaces do not get scratched. If not being replaced, the Drive Collars may
remain on the shafts, otherwise loosen the set screws and slide them off the shafts. UNIBLOC-PD 500 Series may use wear
sleeves, See section 4.4.4.1 sketch.
4.4.1.4 UNIBLOC 300-450 Single Mechanical Seal Installation
The shafts and the rotor housing bores should be cleaned before installing the seal components. Slide the Drive Collars on the
shafts. Moisten the Rotating Seal O-Rings with water or coat them with a lubricant that is acceptable for use with the product.
Slide the Rotating Seal O-Rings onto the shafts and then the Rotating Seal Faces, slotted sides first. Align the slots in the
Rotating Seal Faces with the pins in the Drive Collars. Push the Rotating Seal Faces against the Drive Collars so that the
Rotating Seal O-Rings seat properly. Place the Stationary Seal O-Rings (front & outer) on the Stationary Seal Faces. Only
lubricate these o-rings with water or alcohol. Push the Stationary Seal Faces into the rotor housing so that they seat flat with the
step in the housing. Some applications require pins to be used in the Stationary Seal Faces. When placing them in the rotor
housing align the pins with the holes in the rotor housing and press them in. Do not use objects that will scratch the Stationary
Seal Faces’ seal surface to push them in. Place a product compatible lubricant on the sealing surfaces. If Seal Retaining Rings
were supplied with the pump, bolt them to the rotor housing. Proceed to section 4.4.7 to complete the installation. After
installing the housing push the Drive Collars toward it. Compress the Wave Springs while leaving a 2-3mm (0.08”-0.12”) gap
between the Drive Collars and the Rotating Seal Faces. Tighten the Drive Collar set screws.
UNIBLOC-PD 300-450 with Single Mechanical Seals

Page 18 of 4
4.4.2 Flushed Single Mechanical Seal
The flushed single mechanical seal uses the same stationary mating ring, rotating seal nose ring, spring, and o-rings as the single
mechanical seal discussed in section 4.4.1. The drive collar is different, however. The flushed single mechanical is not available
for UNIBLOC 200-0, 200, 250, and 275. See section 3.3 for more information about flushing systems.
4.4.2.1 Flushed Single Mechanical Seal Removal
Disconnect the flush tubing from the flush housings (55). Loosen the set screws
(D) by inserting an allen wrench into the flush housing port holes. Loosen the stud
nuts (43). Remove the rotor housing (1) by pulling on the ports or by tapping
gently with a rubber mallet and lay it rotor cavity down so that the seals face up.
Do not rock the housing back and forth excessively or let it come in contact with
the shaft splines. The seals may break. The entire seals with the flush housings will
come off intact with the rotor housing. Unscrew the bolts (32) to remove the flush
housings (55), the lip seals (56), and the flush housing o-rings (37). The remaining
seal components may now be removed. To avoid damage, handle and store the
loose seal nose rings (B) and the mating rings (A) so that their lapped sealing
surfaces do not get scratched. To remove the lip seals (56), place the flush housings
so that they are supported at the bolt holes not at the at the o-ring (37) location.
This can be done by placing the flush housings, after all other seal parts have been
removed, back into the rotor housing seal bores. Push or tap the lip seals with a
tube to remove them.
4.4.2.2 Flushed Single Mechanical Seal Installation
Place the mating ring o-rings (33a) in the rotor housing seal bores. Only lubricate these o-rings with water or alcohol. Push the
mating rings into the rotor housing so that they seat flat with the step in the housing. Do not use objects that will scratch the
mating rings’ seal surface to push them in. Check the drive collars (C) for wear at the lip seal location. If a groove is present, the
drive collars may need to be replaced. If the lip seals (56) have been removed, place the flush housings (55) so that the o-ring
groove edges face up. Lubricate the lips and the outer diameters of the lip seals. Push the lip seals, spring sides facing up, into the
flush housings with a tube that is the same diameter as the lip seals. Place the o-rings (37) into the o-ring grooves. Lubricate the
shafts, the outside of the plastic mounting sleeves, and the drive collars at the lip seal location. Slide the flush housings on the
drive collars. Slide the flush housings with the drive collars, seal nose o-rings (33b), and the seal nose rings (B), slotted sides first,
on the plastic mounting sleeves. Align the slots with the pins in the drive collars and push the seal nose rings so that the o-rings
(33b) seat properly. Place a product compatible lubricant on the sealing surfaces. Rotate the flush housings so that its port holes
align with at least one set screw. Lubricate the o-rings (37) and mount the seal cartridge assemblies on the rotor housing. Tighten
the bolts (32). See section 4.4.5 to complete the installation.

Page 19 of 4
4.4.3 Double Mechanical Seal
The flushed Double Mechanical Seal uses the same Stationary Seal Faces (primary & secondary) and Stationary Seal O-rings
(primary & secondary) as the Single Mechanical Seals discussed in section 2.1.2. The Drive Collar and Rotating Seal Face are
different, however. The flushed Double Mechanical Seal is not available for UNIBLOC 200-0, 200, 250, and 275. See section 3.3
for more information about flushing systems.
4.4.3.1 Double Mechanical Seal Removal
Disconnect the flush tubing from the Flush Housings. Loosen the Drive Collar set screws by inserting an allen wrench into the
flush housing port holes. Loosen the stud nuts (item 43 in Figure 4.4.1). Remove the rotor housing (item 1 in Figure 4.4.1) by
pulling on the ports or by tapping gently with a rubber mallet and lay it rotor cavity down so that the seals face up. Do not rock
the housing back and forth excessively or let it come in contact with the shaft splines. The seals may break. The entire Seal
Package, with the Flush Housings attached, will come off with the rotor housing. Unscrew the Bolts to remove the Flush
Housings, the Stationary Seal Faces (secondary), Flush Housing O-Rings, and Stationary Seal O-Rings (secondary). The
remaining seal components may now be removed. To avoid damage, handle and store the loose Seal Faces so that their lapped
sealing surfaces do not get scratched. Remove the Stationary Seal Faces (primary) by pulling them out of the rotor housing seal
bores. Remove the Stationary Seal Faces (secondary) by pushing them out of the Flush Housings.
DoubleMechanical Seals

Page 20 of 4
4.4.3.2 Double Mechanical Seal Installation
Place the Stationary Seal O-Rings (primary & secondary) in the rotor housing
seal bores and the Flush Housings. Only lubricate these o-rings with water or
alcohol. Push the Stationary Seal Faces (primary) into the rotor housing so that
they seat flat with the step in the housing. Push the Stationary Seal Faces
(secondary) into the Flush Housings making sure the o-rings seat properly. Do
not use objects that will scratch the Stationary Seal Faces’ seal surface to push
them in. Place a product compatible lubricant on the sealing surface of the
Stationary Seal Faces.
While the rotor housing is lying flat with the cavity facing down, stack the seal
components on the Stationary Seal Faces (primary). Begin with Rotating Seal
Faces (primary), slotted sides up. Place the Rotating Seal O-Rings (primary)
into the Rotating Seal Faces (primary). Next, place the Drive Collars into the
the Rotating Seal Faces (primary). Making sure to align the slots with the pins,
push the Drive Collar gently to seat the o-rings. Place the Rotating Seal O-
Rings (secondary) on the Drive Collars. Align the slots with the pins, and push
gently to seat the o-rings. Place the Flush Housings over the stacked components,
rotating them to make sure one set screw will be visible through the port holes in
the Flush Housings. Push the housings down gently. Screw in the Bolts and hand
tighten. Lubricate the plastic mounting sleeves and slide them, tapered end first,
into the seals. Tighten the Bolts. Leave the sleeves in the seals and proceed to
section 4.4.5 to complete the installation.
MOUNTING
SLEEVE

Page 21 of 4
4.4.5 UNIBLOC 200-450 Seal Installation – Final Step
See section 5.3 for torque limits. If not part of the shaft seal
assembly, slide the plastic mounting sleeves over the splined
ends of the shafts. Slide on the rotor housing (1) tap it with a
rubber mallet to seat it properly on the dowel pins (20). Make
sure the alignment mark on the rotor housing lines up with the
one on the bearing housing (6). The rotor housing must make
firm contact with the bearing housing. On UNIBLOC models
300-450, fasten the hex nuts (43) with the split washer (44) on
the stud ends and tighten in a cross pattern.
On UNIBLOC models 200-275, insert the one piece studs
(15) through rotor housing and thread into the bearing
housing. Tighten them in a cross pattern by locking two M6
nuts against each other on the protruding stud ends.
Remove the plastic sleeves from the shaft ends. If the shaft
seals are either flushed single or flushed double mechanical,
tighten the set screws through the flush housing’s port holes.
If the rotors are made from a polymer (nonmetal) material,
slide them on the shafts and turn the drive shaft to make sure
the rotors turn freely. They do not require o-rings (26) and
(27) or the rotor bolts (14a, 14b). If the rotors are metal, slide
the rotor shaft o-rings (27) over the splined shaft ends and on
the step, if applicable.
One of the rotors will have a small marking on the rear end.
This indicates that this rotors match with the drive shaft.
Slide the rotors over the corresponding shafts and push them
making sure the o-rings seat properly. The rotors must make
contact with the shafts. Place o-rings (26) on the rotor bolts
(14a, 14b). Lubricate them and the rotor bores. Place a
nonmetal object between the rotors to keep them from
turning. Thread the rotor bolts in to the shaft ends. Turn the
drive shaft to make sure the rotors turn freely. Measure the
clearances between the rotor housing and the rotors. Compare these values with those listed in section 5.4. If the measured
clearances at positions 1-7, 8, and 10 are smaller than those listed, the rotors must be ground and polished to achieve the correct
values. If the measured clearances at positions 9 and 11 are not within the tolerances listed the shafts must be adjusted by
disassembling the bearing housing, as instructed in section 4.5 and changing the shims (11).
Place the o-ring (28) in the groove on the cover (2). Slide the cover on the studs (15). Tighten the front cover nuts (16). Check the
oil level in the bearing housing as described in section 5.2. The pump is now ready to be installed in the system. If flushed seals
were installed, reconnect the flush tubing. Refer to section 2.3 before starting the pump.