Unibloc Pd600 Installation and operating instructions

Operation & Service Manual

UNIBLOC-PD

Models: 600-677

Original Instructions

MANUAL NO.: PD600-677 REVISION: 042022

Information contained in this manual is subject to change without notice

and does not represent a commitment on the part of Unibloc Hygienic

Technologies, LLC. No part of this manual may be reproduced or trans-

mitted in any form or by any means, electronic or mechanical, including

photocopying and recording, for any purpose, without the express

written permission of Unibloc Hygienic Technologies, LLC.

Unibloc Hygienic Technologies, LLC

Revision Date: 04/2022

Manual No.: PD600-677

Unibloc Hygienic Technologies, LLC

1650 Airport Road NW, Suite 110 •Kennesaw, Georgia 30144 •USA

Tel 770-218-8900 E-Mail [email protected]

www.unibloctech.com

UNIBLOC-PD Operation & Service Manual: PD600-677 3

Table of Contents

1.0 General ................................................................................................................4

1.1 Declaration of Conformity.................................................................................................. 4

1.2 General Description............................................................................................................ 5

1.2.1 Limitation .................................................................................................................................................. 5

1.2.2 Noise Emission ........................................................................................................................................ 6

1.2.3 Marking – Standard.................................................................................................................................. 6

2.0 Safety...................................................................................................................6

2.1 General ................................................................................................................................ 6

2.2 Safety Instructions ............................................................................................................. 6

3.0 Installation...........................................................................................................8

3.1 Handling and Storage......................................................................................................... 8

3.2 System Design .................................................................................................................... 9

3.3 Flushed Seal Arrangement ................................................................................................ 9

3.3.1 Single and Double Mechanical Seal Flushing/Cooling ........................................................................ 9

3.3.2 Double O-Ring & O-Lip Seal Flushing/Cooling ....................................................................................11

3.4 Pre-Start Check List ......................................................................................................... 11

4.0 Maintenance......................................................................................................12

4.1 Clean In Place, CIP ........................................................................................................... 12

4.2 Steam In Place, SIP........................................................................................................... 12

4.3 Maintenance Schedule and Recommended Spare Parts.............................................. 13

4.4 Shaft Seal Service............................................................................................................. 13

4.4.1 Front Cover & Rotor Removal............................................................................................................... 13

4.4.2 Single Mechanical Seal.......................................................................................................................... 17

4.4.3 Double Mechanical Seal- MODELS: PD600, PD650, PD675 ............................................................... 19

4.4.4 Triple O-Lip®Seal- MODELS: PD600 to PD677 .................................................................................... 20

4.4.5 Double O-Ring Seal................................................................................................................................ 21

4.4.6 Seal Installation- Final Steps ................................................................................................................ 24

4.5 Bearing Housing Maintenance and Service ................................................................... 25

4.5.1 Bearing Housing Disassembly ............................................................................................................. 25

4.5.2 Bearing Housing Assembly................................................................................................................... 26

5.0 Troubleshooting .............................................................................................29

6.0 Technical Data ..................................................................................................31

6.1 General Dimensions and Weights................................................................................... 31

6.2 Lubricants and Bearing Housing Oil Specication ....................................................... 32

6.3 Torque Requirements & Special Tools .......................................................................... 33

6.3.1 Torque Requirements ............................................................................................................................ 33

6.3.2 Special Tools .......................................................................................................................................... 33

6.4 Rotor Clearances ............................................................................................................. 34

6.5 FoodFirst Wear Ring Ranges ........................................................................................ 35

7.0 Pump Identication and Spare Parts..............................................................36

7 .1 Pump Identication ........................................................................................................ 36

7 .2 Spare Parts....................................................................................................................... 37

4 UNIBLOC-PD Operation & Service Manual: PD600-677

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

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

1.0 General

1.1 Declaration of Conformity

UNIBLOC-PD Operation & Service Manual: PD600-677 5

1.2 General Description

UNIBLOC-PD is a positive displacement rotary lobe pump. It may be supplied with a drive unit (g. 1.1) or without a

drive unit (g. 1.2). When supplied with a drive unit it is called UNIBLOC-PD assembly. Fig. 1.1 indicates various parts

of an assembly. UNIBLOC-PD Models 600-677 can be supplied in 2 di󰀨erent series; 5000 series with stainless steel

bearing housing or 3000 series with painted steel bearing housing. Each model can be mounted with the inlet and

outlet ports in horizontal or vertical orientation. The orientation can be modied using either a foot for horizontal port

orientation or a pedestal for vertical port orientation (g 1.3). Port orientation should be specied when ordering.

1.2.1 Limitation

The pump is designed to operate in both directions without modications (see g. 1.4) and should be used for the duty

for which it has been specied. 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.

PRODUCT

FLOW

PRODUCT

FLOW

PRODUCT

FLOW

PRODUCT

FLOW

g. 1.4

Vertical Porting

PEDISTAL

Horizontal Porting

FOOT

g. 1.3

DRIVE SHAFT

FRONT COVER

MOTOR

REDUCER

COUPLING GUARD

BEARING HOUSING

ROTOR HOUSING

BASEPLATE PORT

BEARING HOUSING

ROTOR HOUSING

PORT

g. 1.1 g. 1.2

6 UNIBLOC-PD Operation & Service Manual: PD600-677

1.2.2 Noise Emission

Under certain operating conditions, pumps and/or drives and/or the systems within which they are installed can pro-

duce sound pressure levels that exceed 80dB. In such cases ear protection should be used.

1.2.3 Marking – Standard

Standard marking is machined on the side of pumps’ bearing housing. Pump size is machined on rotor housing next

to the ports. See gure 1.4 for details.

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 a󰀨ect personal safety if not followed.

WARNING: Indicates electrical voltage instructions that can a󰀨ect personal safety if not fol-

lowed.

ATTENTION: Indicates instructions to be considered for safe operation and to protect the

pump and pump unit.

2.2 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 lled with liquid are very heavy. See g. 2.1 for recommended pipe layout.

WRONG RIGHT

PUMP SIZE

SERIAL NUMBER

g. 1.4



g. 2.1

UNIBLOC-PD Operation & Service Manual: PD600-677 7

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 g. 2.1. 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 hous-

ing, front cover 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 rst consulting your local supplier.

Pump installation and operation must always comply with prevailing health and safety regulations.

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 environ-

ment.

See gure 2.2 for vertical misalignment: Place shims under pump or drive; 0.25mm (0.01inch) max deviation.

See gure 2.3 for horizontal misalignment: Move pump or drive horizontally; 0.25mm (0.01inch) max deviation.

See gure 2.4 for angular misalignment: Rotate pump or drive; 1° max deviation

Avoid any direct contact with hot surfaces of the pump or drive unit. If the surface temperature of the system

exceeds 68°C (155°F), 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 can not 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 ow 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 recircu-

lation 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 ow in the pump when it is being

turned o󰀨. Unibloc-Pump can supply a check valve as non-returning device. Please contact your suppli-

er.

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)



g. 2.2 g. 2.3 g. 2.4

8 UNIBLOC-PD Operation & Service Manual: PD600-677

unless it is assembled with a ushed shaft seal that is properly installed with a fully operational ushing system.

Installation of pressure gauges/sensors in conjunction with the pump’s suction and discharge connec-

tions 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.

If operating with a pulley, proper support must be selected to prevent

excessive bearing wear and bending of the shaft. See g. 2.5. Additional

safety guards are a must.

3.0 Installation

3.1 Handling and Storage

Caution must be taken when lifting the pump or pump unit. For all parts over 20kg (44lbs) we recommend the

use of a lifting device or lifting arrangement when unpacking or moving. Check the weight guide in section 6.0

for details. See g. 3.1 and 3.2 for lifting guidance. For large pumps, lifting eyes will be supplied with the pump

to assist in lifting/moving.

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.



g. 2.5

Vertical Port Mounting Horizontal Port Mounting

g. 3.1

Horizontal Port Mounting Vertical Port Mounting

g. 3.2

UNIBLOC-PD Operation & Service Manual: PD600-677 9

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 ttings and any other restrictions to product ow. Always consider the following when designing a

system:

• Conrm 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-o󰀨 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 gure 2.1

• Make the necessary piping arrangement if pump is supplied with a ushed 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 (3.3ft) free space around the pump for easy maintenance access.

Figure 3.3 shows a typical recommended design and required components for safe operation of the pump. All compo-

nents are available from Unibloc-Pump. Contact your supplier.

3.3 Flushed Seal Arrangement

The ushed seal arrangement cools and lubricates the shaft seal area. All ushed seals must be installed in a proper

system; otherwise the seal will NOT OPERERATE CORRECTLY. The ushing system also works as a barrier be-

tween the environment and the pumped media.

3.3.1 Single and Double Mechanical Seal Flushing/Cooling

DOUBLE MECHANICAL SHAFT SEALS MUST BE FITTED WITH FLUSHING SYSTEMS THAT WILL COOL AND

LUBRICATE THEM, OTHERWISE THE SEALS WILL BE DAMAGED. The ushing system also provides a barrier of

protection between the environment and the pumped media. The uid in this system must be owing before or at the

same time the pump is engaged.

Flushing systems are normally not included with the pump. The piping arrangements and system components shown

in g. 3.4, 3.5 and 3.6 are recommended for satisfactory operation of the seals and to insure containment of the

pumped liquid. Unless otherwise indicated, penetrations to the housing for ushing are 1/8” NPTF. The minimum ow

rate for the ushing system is 1 lpm (0.3 gpm) or a rate that will keep the temperature of the seals within 5°C (9°F) of

the pumped media. The pressure of the ushing system is dependent upon the requirements of the pumping applica-

tion. As a guide, when the ushing system pressure is higher than that of the pumped media, the ushed liquid will en-

ter into the media if the seal fails. Likewise, if the pumped media has a higher pressure than the ushing system, the

media will enter into the ushing system if the seal fails. This is usually benecial in cases when the pumped media is

extremely hazardous, as it may be safely contained and disposed of properly.

PRESSURE RELIEF VALVE

SHUT OFF VALVE

STRAINER

PRESSURE GAUGE

FLOWFLOW

SHUT OFF VALVE g. 3.3

10 UNIBLOC-PD Operation & Service Manual: PD600-677

Recommended Flush System Arrangement: PD600 & PD650

Alternative Flush System Arrangement: PD600 & PD650

The illustrations below in gure 3.5 show alternative methods of arranging the ushing system and its components.

Although not ideal, they are adequate for less critical pump applications.

FLUSH

OUTLET

FLUSH

INLET

SHUT OFF

VALVE

CHECK

VALVE

CONTROL VALVE

(i.e. diaphram valve)

PRESSURE

GAUGE

FLUSH

OUTLET

FLUSH

INLET

SHUT OFF

VALVE

CHECK

VALVE

CONTROL VALVE

(i.e. diaphram valve)

PRESSURE

GAUGE

HORIZONTAL PUMP PORTS VERTICAL PUMP PORTS

FLUSH

OUTLET

FLUSH

INLET

SHUT OFF

VALVE

CHECK

VALVE

CONTROL VALVE

(i.e. diaphram valve)

PRESSURE

GAUGE

FLUSH

OUTLET

CHECK

VALVE

CONTROL VALVE

(i.e. diaphram valve)

PRESSURE

GAUGE

SHUT OFF

VALVE

FLUSH

INLET

HORIZONTAL PUMP PORTS VERTICAL PUMP PORTS

g. 3.4

g. 3.5

UNIBLOC-PD Operation & Service Manual: PD600-677 11

Recommended Flush System Arrangement: PD602, PD652 & PD677

3.3.2 Double O-Ring & O-Lip Seal Flushing/Cooling

Double o-ring shaft seals, like the double mechanical seals, must also be tted with ushing systems that will cool

and lubricate them, otherwise the seals will NOT OPERATE CORRECTLY. The ushing system may be arranged the

same as the double mechanical seals, shown in gures 3.4-3.6. The double o-ring seals may also be lubricated with

grease if the pump application justies doing so. In this case, the seal ush chambers are lled through grease nip-

ples with approved grease that is suitable for use with the pumped media. Unibloc recommends using Lubriplate

Synxtreme FG-2 calcium sulfonate complex grease. The chambers must be lled 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.

3.4 Pre-Start Check List

o Check the pipes to make sure they have been purged of debris. Any remaining particles larger than 0.002 in.

(0.05 mm) can damage the pump if they enter it. A ltering device installed before the pump inlet is highly

recommended to insure safe and proper operation. Since such a device will restrict the ow to the pump, it is

necessary to verify that the net positive suction head (NPSH) available is not reduced below that required by

the pump. Unibloc-Pump stocks in-line strainers which will prevent hazardous objects from entering

the pump and will capture them for easy removal from the system.

oCheck all obstructions to make sure they have been removed from pipe or pump.

o Check pump connections and make sure they are tight.

oCheck lubricant levels to make sure they are correct.

o Check that safety guards are in place.

oCheck inlet and outlet valve to make sure they are open and functional.

o Check the seal ushing is connected and activated, if applicable.

HORIZONTAL PUMP PORTS VERTICAL PUMP PORTS

CONTROL VALVE

(i.e. diaphram valve)

PRESSURE

GAUGE

CHECK

VALVE

CHECK

VALVE

FLUSH

INLET

FLUSH

OUTLET

FLUSH

INLET

SHUT OFF

VALVE

SHUT OFF

VALVE

CONTROL VALVE

(i.e. diaphram valve)

PRESSURE

GAUGE

CHECK

VALVE FLUSH

INLET

FLUSH

OUTLET SHUT OFF

VALVE

g. 3.6

12 UNIBLOC-PD Operation & Service Manual: PD600-677

4.0 Maintenance

BEFORE ANY MAINTENANCE TAKES 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 pro-

cedure. However, specic advice for each application can be obtained from your pump supplier.

If the temperature di󰀨erence between the process liquid, or the pump, and the cleaning media is greater than 10º C

(18º F), 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 lled 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 ushed 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 specic 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, specic 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 continue to be

ushed 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 specic 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.



UNIBLOC-PD Operation & Service Manual: PD600-677 13

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-o󰀨 valves on both sides for easy isolation of pump if

manual service is required.

The UNIBLOC-PD bearing housing is supplied permanently lubricated with nitrile seals. However, for certain applica-

tions and at the user’s request, drain plugs and a vent will be supplied. When applications exceed constant service

temperatures of 180º C (356º F) a vent and high temperature lubricant must be used. For such cases, contact Uni-

bloc-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 rst)

• 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)

• 1 wet-end o-ring kit (for Metal Rotors) Qty 1 (5-9 o-rings depending on shaft style)

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.

4.4.1 Front Cover & Rotor Removal

4.4.1.1 Front Cover Removal

Remove the Front Cover Nuts, Front Cover, and Front Cover O-ring (see g. 4.1).

FRONT COVER NUTS

FRONT COVER

FRONT COVER O-RING

g. 4.1

14 UNIBLOC-PD Operation & Service Manual: PD600-677

ROTOR BOLT WASHERS

ROTOR BOLTS

(1 or 3 Bolts Per Rotor)

LOCK WASHERS

ROTOR BOLT O-RINGS

ROTOR BOLT WASHER O-RINGS

ROTOR HOUSING

ROTORS

g. 4.3

QuickStrip®ROTORS

SHAFTS

ROTOR HOUSING

g. 4.2

ROTOR LOCKING NUTS

ROTOR BOLTS

ROTOR BOLT O-RINGS

ROTOR LOCKING NUT O-RINGS

ROTOR HOUSING

ROTORS

g. 4.4

4.4.1.2 Rotor Removal- QuickStrip®Rotors

QuickStrip®Rotors do not require locking mechanisms and can simply be removed from the rotor housing by sliding

them o󰀨 the shafts. Be sure to place the rotors in a safe place while maintenancing the pump, as they can be easily

damaged. Proceed to the respective shaft seal maintenance section once the rotors have been removed (see g.4.2).

4.4.1.3 Rotor Removal- Stainless Steel Rotors

If the pump has Stainless Steel Rotors, place a nonmetal object (e.g. screwdriver handle) between the rotors to

keep them from turning before removing rotor bolts.

4.4.1.3.1 Three-Bolt Style Shafts

Remove the six Rotor Bolts, Rotor Bolt O-rings, Rotor Bolt Washers, and Rotor Bolt Washer O-rings. Slide the

Rotors o󰀨 the Shafts. If the rotors will not slide o󰀨 they can be removed simultaneously with the Rotor Housing.

Unless they are being replaced, DO NOT USE PLIERS OR CHANNEL LOCKS TO REMOVE THE ROTORS. THEY

WILL BE DAMAGED. Be sure to place the rotors in a safe place while maintenancing the pump as they can be easi-

ly damaged (see g. 4.3).

4.4.1.3.2 Single-Bolt Style Shafts (602, 652 & 677 models only)

Remove the two Rotor Bolts (requires special tool, P.N. 6007-2, see section 6.3.2), Rotor Locking Nuts and

O-rings. Slide the Rotors o󰀨 the Shafts. If the rotors will not slide o󰀨 they can be removed simultaneously with the

Rotor Housing. Unless they are being replaced, DO NOT USE PLIERS OR CHANNEL LOCKS TO REMOVE THE

ROTORS. THEY WILL BE DAMAGED. Be sure to place the rotors in a safe place while maintenancing the pump as

they can be easily damaged (see g. 4.4).

UNIBLOC-PD Operation & Service Manual: PD600-677 15

4.4.1.4 Cover and Rotor Removal- FoodFirst

FoodFirst Rotors do not require locking mechanisms and work in tandem with the FoodFirst Front Cover. The

FoodFirst system utilizes two sets of of removable wear rings. One set of wear rings are located in the front cover

(Front Cover Wear Rings) while the other set are located in the rotors (Rotor Wear Rings). It is important to take

care when maintenancing FoodFirst pumps. Damage to the wear rings, rotors, and front cover may prevent the pump

from operating as intended.

4.4.1.4.0 FoodFirst Front Cover Removal (reference gs. 4.1, 4.4.1)

Remove the Front Cover Nuts (see g. 4.1). Carefully remove the FoodFirst Front Cover, taking caution not to

damage the Wear Rings. The Rotor Wear Rings may adhere to the Front Cover Wear Rings and dislodge from the

Rotors during Front Cover removal. Store any loose wear rings in a safe place.

4.4.1.4.1 FoodFirst Front Cover Wear Ring Removal- Standard Front Cover (ref. g. 4.4.2)

The Front Cover Wear Rings may be removed from the Front Cover by gently pulling them out of the cover. Once

removed, be sure to store wear rings in a safe place.

4.4.1.4.2 FoodFirst Front Cover Wear Ring Removal- High Pressure (HP) Cover (ref. g. 4.4.3)

The Front Cover Wear Rings may be removed from the Front Cover by gently pulling them from the spigots. Once

removed, be sure to store wear rings in a safe place.

FRONT COVER WEAR RINGS

ROTOR WEAR RINGS

FOODFIRST ROTORS

FOODFIRST FRONT COVER

ROTOR HOUSING

g. 4.4.1

FRONT COVER WEAR RINGS

FOODFIRST FRONT COVER

g. 4.4.2

FRONT COVER WEAR RINGS

FOODFIRST FRONT COVER (HP)

SPIGOTS

g. 4.4.3

16 UNIBLOC-PD Operation & Service Manual: PD600-677

ROTOR WEAR RING

SCREWDRIVER SLOTS

FOODFIRST ROTOR

g. 4.4.5

DOWEL PIN HOLES

ROTOR WEAR RING

g. 4.4.6

DOWEL PIN HOLES

FRONT COVER WEAR RINGS

g. 4.4.7

4.4.1.4.3 FoodFirst Rotor Removal (reference g. 4.4.1)

Each FoodFirst Rotor is composed of two parts, a Rotor and a Rotor Wear Ring. During assembly and operation

the Rotor Wear Ring is seated in a groove on the Rotor. When maintenancing the pump, the Rotor Wear Ring(s)

may dislodge from the Rotor(s) during Front Cover removal. If the Rotor Wear Ring(s) are still seated in the Rotors

after cover removal, they can be removed once the rotors have been removed from the Rotor Housing. Remove the

Rotors from the Rotor Housing by sliding them o󰀨 the shafts. Be sure to place the rotors in a safe place while main-

tenancing the pump, as they can be easily damaged.

4.4.1.4.4 FoodFirst Rotor Wear Ring Removal (reference g. 4.4.5)

The Rotor Wear Rings may be removed from the Rotors by gently prying them with a small at head screwdriver.

Screwdriver slots are located along the perimeter of the wear rings to aid in removal. Once removed, be sure to store

wear rings in a safe place.

4.4.1.4.5 FoodFirst Rotor Wear Ring Installation (reference g. 4.4.6)

Thoroughly clean Rotors and Wear Rings before installing. Inspect Rotor Wear Rings for excessive wear and dam-

age. If damaged, replace Wear Rings with new ones. If Rotor Wear Ring is not damaged, it is important to ensure

that it is within the acceptable wear range (see section 6.5). To check wear level, insert the wear ring into the rotor

by aligning the wear ring dowel pins with the rotor dowel holes. If the Rotor Wear Ring is within the acceptable wear

range (see section 6.5), remove the wear ring and place a generous amount of food grade grease on each dowel pin

before aligning and installing the wear ring for nal installation.

4.4.1.4.6 FoodFirst Rotor Installation (reference g. 4.4.1)

With the Rotor Wear Ring installed, align missing rotor spline with missing shaft spline and slide rotor onto shaft.

4.4.1.4.7 FoodFirst Front Cover Wear Ring Installation (reference g. 4.4.7, section 6.5)

Thoroughly clean Front Cover and Wear Rings before installing. Inspect Front Cover Wear Rings for excessive

wear and damage. If damaged, replace Wear Rings with new ones. If Cover Wear Ring is not damaged, it is impor-

tant to ensure that it is within the acceptable wear range (see section 6.5). To check wear level, insert the wear ring

into the cover by aligning the wear ring dowel pins with the cover dowel holes. If the Cover Wear Ring is within the

acceptable wear range (see section 6.5), remove the wear ring and place a generous amount of food grade grease

on each dowel pin before aligning and installing the wear ring for nal installation.

UNIBLOC-PD Operation & Service Manual: PD600-677 17

ROTATING SEAL FACES

ROTORS & PINS

ROTATING SEAL O-RINGS

STATIONARY SEAL FACES

ROTOR HOUSING

SHAFTS BEARING HOUSING

STATIONARY SEAL O-RINGS

STATIONARY SEAL FACE HOLDERS

RETAINING RINGS

RETAINING RING O-RINGS

REAR VEW- ROTOR HOUSING

FRONT VEW- ROTOR & BEARING HOUSING

REAR ROTOR HOUSING STUD NUTS

g. 4.5

4.4.2 Single Mechanical Seal

This type of shaft seal is used in most applications with products that have a viscosity of less than 14,000 cPs. The

maximum rotational speed of this seal is 600 rpm and the maximum service pressure is 20.7 bar (300 psig). The seal

materials available are stainless steel, carbon, and silicone carbide. The standard o-rings supplied in these seals are

Viton or EPDM, either food or FDA grade, but may be replaced with other materials as applications dictate. The seal

can be serviced without removing the rotor housing.

4.4.2.1.1 Single Mechanical Seal Removal- MODELS: PD600, PD650, PD675

(reference gs. 4.1, 4.5)

Slide the stainless steel Rotors o󰀨 the shafts. If the rotors will not slide o󰀨 they can be removed simultaneously with

the Rotor Housing. Unless they are being replaced, DO NOT USE PLIERS OR CHANNEL LOCKS TO REMOVE

THE ROTORS. THEY WILL BE DAMAGED. The Rotating Seal Faces, Pins, and Rotating Seal O-rings are

assembled inside the Rotors and will slide out with them. Slide the Stationary Seal Face, Stationary Seal O-rings,

and Stationary Seal Holders out of the housing. To avoid damage, handle and store the loose Rotating Seal Faces

and the Stationary Seal Faces so that their lapped sealing surfaces do not get scratched. If servicing the Bearing

Housing, remove the Rotor Housing by rst loosening the Rear Rotor Housing Stud Nuts. Use a hoist and eye bolt

to support the Rotor Housing. Tap on the ports with a rubber mallet and pull the Rotor Housing o󰀨. Unless being

serviced, the Retaining Rings may remain attached to the Rotor Housing.

4.4.2.1.2 Single Mechanical Seal Installation- MODELS: PD600, PD650, PD675

(reference gs. 4.1, 4.5, 4.15)

Clean all components prior to installing the seals. If the Rotor Housing was removed, attach it to the Bearing

Housing rst. Make sure Retaining Rings with Retaining Ring O-rings are attached to the Rotor Housing. Using

an eye bolt, hoist the rotor housing on the Dowel Pins (see g. 4.15 on pg. 24) and slide it on, while at the same time

threading on the Rear Rotor Housing Stud Nuts. Tap the Rotor Housing with a rubber mallet to seat it properly

against the Bearing Housing. Tighten the Rear Rotor Housing Stud Nuts in a cross pattern. Place the Stationary

Seal Face Holders against the Stationary Seal Faces so that the pins slide into the slots. Moisten the Stationary

Seal O-rings with water or coat them with a lubricant that is acceptable for contact with the product. Slide these

components in the rotor housing bores. If removed from the rotors, lubricate Rotating Seal O-rings and slide them

in the rotors together with the Rotating Seal Faces locating them on the seal pocket Pins on the back side of the

the Rotors. The Rotating Seal Faces must be pressed in evenly so that the Rotating Seal O-rings do not come o󰀨.

They have been installed correctly if they do not fall out when tilting the rotors. Do not use objects that will scratch

the Rotating Seal Faces’ surface to push them in. Place a product compatible lubricant on the sealing surfaces of

the Stationary Seal Faces and Rotating Seal Faces. Slide the Rotors on the Shafts. Proceed to section 4.4.6 to

complete the installation.

18 UNIBLOC-PD Operation & Service Manual: PD600-677

ROTATING SEAL FACES

ROTORS & PINS

ROTATING SEAL O-RINGS

STATIONARY SEAL FACES

ROTOR HOUSING

SHAFTS

BEARING HOUSING

STATIONARY SEAL O-RINGS

STATIONARY SEAL FACE HOLDERS

STATIONARY SEAL FACE HOLDER O-RINGS

REAR VEW- ROTOR HOUSING

FRONT VEW- ROTOR & BEARING HOUSING

RETAINING RINGS

REAR ROTOR HOUSING STUD NUTS

g. 4.6

4.4.2.2.1 Single Mechanical Seal Removal- MODELS: PD602, PD652, PD677

(reference gs. 4.1 , 4.6)