North Ridge Pumps RLP Series Instruction manual

Pump Type
:
Pump Serial No.
:
Max. Pressure
:
Bar
Capacity
:
m³/h
Motor Power
:
kW
Pump Speed
:
rpm
Project Number
:
Tag No.
:
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
X-Cel House, Chrysalis Way, Langley Bridge, Nottinghamshire, NG16 3RY
Tel: [phone] | Email: [email protected] | Website: www.northridgepumps.com
Installation Operation & Maintenance Manual
RLP Lobe Pump Series

1
GENERAL USAGE INSTRUCTIONS ................................................................................................................ 2
SAFETY INSTRUCTIONS ............................................................................................................................... 2
A. OVERVIEW ...................................................................................................................................... 3
A1- Description of Pumps and Working Principle ..........................................................................................3
A2- Aim of Use and Fields of Application .......................................................................................................3
A3- Coding System of Pumps ..........................................................................................................................3
A4- Technical Specifications ............................................................................................................................4
A5- Pump Models ............................................................................................................................................4
B. OPENING PACKAGE, HANDLING AND STORING................................................................................. 4
B1- Opening Package ......................................................................................................................................4
B2- Handling ...................................................................................................................................................4
B2.1- General Warnings ...........................................................................................................................4
B2.2- Lifting Operation .............................................................................................................................4
B3- Forwarding ................................................................................................................................................5
B4- Storing .......................................................................................................................................................5
C. COMMISSIONING ............................................................................................................................ 5
C1- Accepting / Allowing .................................................................................................................................5
D. INSTALLATION ................................................................................................................................ 5
D1- Bare Shaft Ended Pump ............................................................................................................................6
D2- Assembly Preparations .............................................................................................................................6
D3- Assembly Location ....................................................................................................................................6
D3.1- Base Plate / Chassis ........................................................................................................................6
D3.2- Mounting Base.................................................................................................................................6
D4- Couplings Adjusts .....................................................................................................................................7
D5- Pipe Lines ..................................................................................................................................................8
D5.1- Overview .........................................................................................................................................8
D5.2- Suction Line ....................................................................................................................................9
D5.3- Discharge Line................................................................................................................................10
D5.4- Electrical Connections ...................................................................................................................10
D5.5- Final Checks ...................................................................................................................................11
E. Starting and Stopping .....................................................................................................................11
E1- Oil Check..................................................................................................................................................11
E2- Rotation Direction Check ........................................................................................................................11
E3- Starting Pump..........................................................................................................................................11
E4- Stopping the Pump..................................................................................................................................12
E5- Checks During Operating.........................................................................................................................12
F. Disassembling, Repairing and Reassembling....................................................................................12
F1- Disassembling Pump................................................................................................................................13
F2- Repairing Pump .......................................................................................................................................13
F3- Reassembling Pump ................................................................................................................................13
F4- Seals.........................................................................................................................................................13
F4.1- Mechanical Seals............................................................................................................................13
G. SECTION VIEW DRAWINGS .............................................................................................................14
H. MALFUNCTIONS, POSSIBLE CAUSES AND FIXING METHODS .............................................................15
İ. PUMP DIMENSIONS........................................................................................................................16
J. SAFETY COVERS..............................................................................................................................17
K. SPARE PARTS LIST...........................................................................................................................18
L. TYPES OF PUMP PORTS, LOBES, AND HEATING JACKETS ..................................................................22
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488

GENERAL USAGE INSTRUCTIONS
SAFETY INSTRUCTIONS
- Any stress, contractile and/or weight Should Not be transferred to pump.
- Before approaching pump system, Always make sure to cut off all electrical connections and be aware not to
let any accidental short circuits occur.
- Never insert any objects in any holes or empty spaces.
- Never walk on top of pump and/or piping system.
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
The aim of this manual is to inform user about the following;
- Assembly and maintenance of Pump.
- Starting, operating and stopping methods.
- This handbook should be kept where qualified operators and experienced maintenance
staff can find with ease.
- Maintenance staff should be experienced and well acknowledge of safety standards.
- To avoid improper use of pumps, the instructionsgiven in this handbook should be studied carefully and be
applied in every step of installation and operation.
- User is responsible for control and installation, ensuring this is performed by qualified personnel who have
studied this handbook carefully.
- Pump should only be used within conditions stated in purchase order. This is due to selection of pump
materials and tests been done according to operating conditions mentioned at time of enquiry.
- Pleasecontact North Ridge Pumps in case of use of pump in operating conditions that varyfrom what has
mentioned at time of enquiry. Unless written confirmation is received, North Ridge will not accept any
responsibility of damages caused by using pump differently to that mentioned at the time of enquiry.
- If delivered pump will be stored for some time before use, pump should be stored in clean and dry place
where ambient temperature does not vary. Very high and low temperatures may cause major damage to the
pump.
- North Ridge Pumps will not guarantee any maintenance, repair or changes performed by end user
or any unauthorized person.
- This handbook does not include information regarding safety instructions that should be followed at actual
place of operation falling outside the scope of this manual.
follow instructions below to avoid physical and/or property losses.
- Run pump Only according to stated operating conditions.
- Electrical connections of motor and auxiliaries Should be done by qualified personal and according to local
terms and conditions.
- Pump system Should Not be approached until all rotating parts have stopped.
- Any action taken on pump system Should Always be done by a minimum of two personnel.
- Anyone approaching pump system Should Always be dressed with required safety gear(s).
- Never approach pump while it is hot.
-Never touch pumps and pipes with 80 oC (176 oF) temperature or higher. User should take all
necessary precautions.
- Never approach pump and connected pipes while under pressure.
- After finishing all work on pump, all guards removedShould be reinstalled.
2

3
Figure 1. Working Principle
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
RLP Series
A. OVERVIEW
A1- Description of Pumps and Working Principle
Pumps in our RLP Series are manufactured with horizontal shaft, ports at 180°. The pump head contains two
lobes. The rotary lobes are symmetrical, and do not contact whilst in operation due to the use of timing gears.
A- Lobes rotate, in opposing directions, which
increase the volume within the suction port and
creates a vacuum. Thus, liquid enters the pump and
fills the gaps between lobes.
B- While liquid fills the space between the lobe and the
casing, lobes deliver the liquid to the discharge port as
they rotate. .
C- By meshing together, liquid is forced out of
discharge port under pressure.
A2- Aim of Use and Fields of Application
The RLP Series of pumps are used to transfer viscous and semi-viscous liquids at operating temperatures
that varyfrom –20 to 250 oC. Example of main applications are;
• Food Processing
• Beverage Transfer
• Dairy Products
• Personal Hygiene Products
• Pharmacuetical
• Biochemical Industries
A3- Coding System of Pumps
R LP 2 –001 –012 –010
Pump Type
Lobe Pump
Size
Sealing (Mechanical)
Capacity (lt/rev) (0.12 lt/rev)
Inlet/Outlet Port Diameter (1”)

4
A4- Technical Specifications
Speed : up to 1000 rpm (Max.)
Suction/Discharge Flanges : DN 25 … DN 150 mm TS ISO 7005-2, DIN 2533/PN 16
Operating Temperature
B. OPENING PACKAGE, HANDLING AND STORING
Table 1.
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
RLP 2-001-012 RLP 5-001-130 RLP 2-002-012 RLP 5-002-130
RLP 2-001-018 RLP 5-001-180 RLP 2-002-018 RLP 5-002-180
RLP 2-001-023 RLP 6-001-285 RLP 2-002-023 RLP 6-002-285
RLP 4-001-062 RLP 6-001-355 RLP 4-002-062 RLP 6-002-355
RLP 4-001-090 RLP 4-002-090
: -20 200 oC –for Soft Seals (Packing Glands) and Mechanical Seals
Ambient Temperature (Max.) : 40 ºC
Casing Pressure (Max.) : 40 bar
Transferrable Liquids : See A2
Protection Class : IP 55
Electrical Connection : 3 Phase - 400V - 50 Hz
Motor Options (on demand) : Special Voltage, Frequency & ATEX (Ex. Proof)
A5- Pump Models
B1- Opening Package
• Check package for any damage.
• Check if all products on Delivery Note / Packing List have arrived complete.
B2- Handling
B2.1- General Warnings
• Wear gloves, safety shoes and helmet.
• Handling pallets or boxes shoudl be performed by a forklift, crane or hoists.
B2.2- Lifting Operation
• Determine lifting/handling points before lifting pump. Check:
- Total weight and centre of gravity, - Major external dimensions, -Lifting Points.
• Lifting capacity should be suitable for pump or pump system.
• Pump or Pump System should always be handled horizontally.
• Standing near or beside lifted load is strictly prohibited.
• To avoid any damage to pump or pump system, handling should be done as shown in Figure 2a or Figure 2b

5
B3- Forwarding
• Pump has been placed on pallet or in box according to its volume and weight.
D. INSTALLATION
Installation should be done according to EN 60204-1 Standards.
Installing and adjusting balance of pump should only be done by qualified personal. Otherwise, major
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
Figure 2a. Bare Shaft Ended Pump Figure 2b. Baseplate Mounted Pump
• Freight company should deliver pump which will not allow any damage and according to forwarding rules,
terms and conditions.
• Delivered pump and auxiliaries should be checked for damage caused during forwarding.
B4- Storing
• If pump will not be installed immediately, pump should be stored in clean and dry place where ambient
temperature does not vary.
• All required precautions should be done to protect pump from dust dirt and foreign substances.
• Rotate pump shaft by hand (e.g. once a month) to avoid pitting on surface of bearings and pump jamming.
C. COMMISSIONING
C1- Accepting / Allowing
• Check delivered product for damages.
• Check correctness of name and type information on label with information on PO and package label.
• In case of damage or deficiency, a written report should be presented firstly to the Freight Company
then to North Ridge Pumps.
• When contacting North Ridge regarding a delivered pump, always remember to mention Serial Number
on pump label.
breakdowns may occur due to wrong installation as shown in Figure 3.
Such breakdowns are not covered by guarantee.

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and manufactured properly to prevent any vibration and deformation.
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
D1- Bare Shaft Ended Pump
• If purchasing a bare shaft ended pump, firstly, base plate/chassis should be rigid
• In case a pump without motor/geared motor is purchased, then a proper coupling and motor/geared motor
should be obtained.
Following should be taken in consideration when making a motor or geared motor selection:
−selecting pump speed that provides required liquid transfer capacity
−Pump pressure head
−Required power source (frequency, voltage … etc.)
−Motor Type (TEFC, Ex. Proof … etc.), Gearbox type
−Assembly way of motor/geared motor (foot mounted, horizontal, vertical … etc.)
D2- Assembly Preparations
Before assembling system ensure the following is followed;
•Covers removed from both ports and carefully clean all sides of suction and discharge ports.
• If pump has been temporary stored, all lubricants (grease/oil) on bearings should be emoved,
carefully cleaned and lubricated again with the same lubricant.
( Attention: this does not apply on pump lubricated with lifetime greases)
D3- Assembly Location
• Pump should work in a well ventilated environment and where there is no risk of freezing or
explosion hazard.
• Sufficient space should be on both sides and top of pump for convenience during maintenance.
• Suction line connected to pump should be as short as possible.
D3.1- Base Plate / Chassis
• Making and assembling of pump should be done so carefully. Incorrect and/or unsupported assembly
will cause pump parts to wear sooner and for pump to breakdown.
• Pump base should be heavy enough to absorb vibration and rigid enough to prevent any torsion and
damages in balance and adjustment of components. Before mounting pump to concrete base, base should
have hardened. Upper surface of concrete base should be level.
D3.2- Mounting Base
• Place pump system on top of concrete base. Then check level of pump system .
• Slightly turn anchor studs.
• Adjust coupling as shown in D4.
• Keep turning studs until level is accomplished.

7
Base should handle 100 N/mm2Force per each m2.
D4- Couplings Adjusts
a) Angular failure
b) Parallel sliding failure
Figure 3. Concrete Base, Chassis and Anchorage
Figure 4a. Wrong Figure 4b. Right
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
a = Space between two sides of coupling.
e = Distance between to axis
e = 0 (is always required)
a value should be within tolerances available for each type of coupling.
• The Most important factor required for a pump system to operate without breakdown is
correct adjust to coupling. Incorrectly adjusted coupling is often the reason for various issues like vibration,
noise, heating of bearings, overload and many other problems.
• Elastic Coupling should never be considered as an element which can compensate for misalignment.
Elastic coupling does not self rectify adjustments.
• “Coupling adjustment” is ensuring that axisof both pump and driver are in line. All pumps supplied by North
Ridge Pumps, have all required coupling adjustments performed at our factory. However, these
adjustments could be altered easily during forwarding, handling, Installation and piping. Therefore, despite
our adjustment of coupling tolerances, it should be checked again before install.
• To adjust coupling you will need two metal pieces with straight sides no less than 10 cm (e.g. steel ruler,
tolerance gauge) and a caliper. For sensitive adjustment special equipment should be used.
• In coupling adjustment, two possible failures may occur;
• To check for angular failure, measure gap distance between two coupling in vertical and horizontal positions.
Distancesshould be equal.
• To check parallel sliding failure, hold one metal piece with straight sides on one coupling parallel to axis and
hold the other piece opposite on the other coupling half. Then check for gaps. Metal piece should touch its
straight side on both coupling halfs at the same time. Check in horizontal and vertical positions. (Figure 4)

8
• Adjusting failures may occur in horizontal and/or in vertical planes. Vertical adjusting failures can be
corrected by placing thin metal sheets below foots of pump or motor/geared motor. Horizontal adjusting
failures can be corrected by sliding pump or motor/Gearmotor; though taking advantage of spaces in
connection holes. See Figure 5a, 5b, 5c, and 5d respectively for correcting coupling adjusts.
Figure 5a. Horizontal Angular Adjust Failure Figure 5b. Vertical Angular Adjust Failure
Figure 5c. Horizontal Parallel Sliding Failure Figure 5d. Vertical Parallel Sliding Failure
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
D5- Pipe Lines
D5.1- Overview
• Never consider pump as a holder or supporting point for pipe lines.
• Pipe lines should be supported from all points near to pump (See Figure 6). After making all piping,
check if suction and discharge pipelines are applying any tension to ports of the pump.
• Diameter of all tubes, pipes, fittings and accessories used should be larger or at least equal to port diameter
of pump. Never use any pipes or accessories with diameter smaller than port diameter of pump. In general,
speed of flow should not exceed 2 m/s in suction line and 3 m/s in discharge line. High speed causes major
pressure loss which generates cavitation conditions in the suction line &high friction pressure in discharge line.
• It is a must to use connecting parts that can absorb and avoid transmission of external forces caused by
intense vibration and/or thermal expansion when transferring hot liquids.
• Any remaining welding spatter and/or any kind of hard particles inside pipe lines may damage the pump.
Therefore, to avoid such particles from entering the pump, suction and discharge ports should be protected
and closed with proper gaskets. After assembly of pipes, all remaining particles should be removed,
cleaned and reassembled after painting.

9
occur.
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
Avoid this design
If Elbows are necessary utilise horizontal
elbows, as oppossed to vertical
To avoid forming of air pockets, pipework
should rise gently to pumps inlet
Pump should be located as close to inlet tank as
possible
D5.2- Suction Line
• Suction pipes should be fitted tightly and designed in a way that will not allow any air pockets to
• In order to reduce pressure losses caused by friction suction distance should be shortened with sharp
elbows avoided and sudden changes in direction.

10
possible to the pump.
D5.4- Electrical Connections
• Electrical motors should be manufactured according EN 60034-1.
• Minimal protection class of motor casing and control systems used within pump group should be
according to standards no lower than EN 60529 IP 55. However, during selection of protection class of motor
and electrical connections, working and environmental conditions should be taken in consideration.
• Electrical connections should be made by qualified electricians only. Applicable national regulations and
instructions of motor manufacturer should be applied.
• All protection precautions shown under title of “Safety Instruction” should be applied. All
power connections should be discontinued before starting any work.
• Before making electrical connections, check rotor’s capability to rotate smoothly by rotating it by hand.
Motor Power
PN ≤ 4 kW
PN > 4 kW
Power Source
3 P1N1PE ~ 400 V
3 P1N1PE ~ 400 V
Connection Type
Y –Connection (13b)
Δ –Connection (13a)
Y / Δ - start
Not Applicable
Remove Bridges (13c)
Table 2.
Figure 11a. Δ- connection Figure 11b. Y –connection Figure 11c. Y / Δ- connection
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
D5.3- Discharge Line
• In order to adjust capacity & pressure, a control valve should be assembled ondischarge line as near as
• If discharge line is quite long, then a check valve should be installed to protect the pump from fluid
pulsations and to avoid itfrom flowing back in the opposite direction.
• All electrical cable routing should be performed to avoid contact with pipelines, motor casing and pump.
• Values of voltage, frequency and phase given on label of motor should be compared with values available.
• In order to protect electrical motors from overload risks, circuit breakers and/or fuses should be used.
Selection of circuit breakers and fuses should according to exact electrical load current given on motor.
• Electrical connections must be made in accordance with local electrical guidelines and Earthing must
not be forgotten.
• Connection schematic for the motor can be found in the motor terminal box or manual.
• Electrical connections vary according to motor power, power source and connection type. Required 
connections in terminal box are as shown in Table 2 and in Figure 13a, 13b, and 13c.

11
E. Starting and Stopping
E1- Oil Check
• Pumps equipped with grease lubricated type bearings are filled with required grease to operate pump safely
Figure 14. CW/CCW Rotation Directions
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
D5.5- Final Checks
• After applying all procedures given above, coupling adjusts should be rechecked & (if necessary) corrected
according to instructions in Section D4. To be sure that pump rotates ifconvenient, rotor should be turned
by hand several times. Then pump should be started and after reaching regular operating conditions,
pump should be stopped and thin sheet metals should be placed under motor foot. After that, a final
coupling adjustment should be done. It is highly recommended to make last check of coupling adjustments
while at operating temperature.
• Pump system should never be operated without placing safety covers back to original positions. Following
this safety rule is a must.
for at least one year after dispatch. Before starting pump, bearing should be checked for any foreign
particles which may appear during forwarding. In case any dirt or foreign particles are found, bearings
should be cleaned and refilled with grease. If pump has been stored for over 6 months, bearings should be
refilled with grease.
• Bearings lubricated with liquid oil should be refilled with oil up to level shown on oil indicator.
E2- Rotation Direction Check
• Lobe pumps rotate clockwise when observed from coupling side. This direction is demonstrated with an
arrow label placed on the pump. By running for a very short period, pump rotation direction should be
checked following direction of the arrow.
• Lobe pumps can be operated in reverse direction. In case of bypass, direction of bypass should be
reversed if the pump is to operate in reverse direction. (See Figure 12)
E3- Starting Pump
• Open all valves on pipelines and make sure that there are no obstruction. Fill Pump with medium.
• Make sure that all safety devices are placed correctly, all moving equipment are covered and
protective coversare in place before starting,to avoid any physical injuries.
• To check if the rotation direction is correct, start the pump for a few seconds and check arrow on pump
cover.

12
• Check capacity, pressure and temperature.
• Check elastic part(s) of coupling on periodic basis. Renew all damaged parts.
F. Disassembling, Repairing and Reassembling
• Always remove all electrical connections before approaching the pump and take all necessary precautions to
avoid running the pump accidently.
• Strictly follow all instructions given in “Safety Instructions” section.
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
• Start the pump and check speed and percentage of liquid flow. If not as required, stop the pump and refer to
troubleshooting guide.
• If pump is sealed with packed gland / soft seal, then allow a small amount of leakage from seal to cool and
lubricate seal. Control the leakage with packing press.
In case of g any of the following problems while pump is running in nominal speed, pump should be
immediately stopped and troubleshot:
• Pump is not delivering any liquid.
• Pump is not supplying enough liquid.
• Motor overloaded.
• Vibration.
• Pump is making a lot of noise while working.
• Bearings are over heating.
E4- Stopping the Pump
• Stop the motor. Wait until all pump system has stopped.
• Close suction valve and all auxiliary pipelines (if any) in case of not running pump for a long period of
time. If the pump will not be used for a long time and/or if there is any chance of liquid freezing, then pump
should be completely emptied via unloading plugs and all required precautions should be taken to avoid
freezing.
E5- Checks During Operating
• Check noise level, vibration and pump heat on regular basis.
• Check for abnormal leakage.
• Check flow and discharge pressure on regular basis.
• Check pump seal and all other wearable parts and replace them if necessary.
• All valves on auxiliary systems should be open.
• In pumps equipped with packing, liquid drop should be allowed from packing press side. In case of
high amountsof leakage, slightly tighten both nuts onpacking press simultaneously until level of leakage
drops. If the nuts are tightened fully, then remove all seal rings, carefully clean seal pocket and place new
seal rings. Ensure new rings have appropriate size and length, and connectionsare at different positions.
• If pump is sealed with a mechanical seal then there is no need for periodic maintenance. Having a
considerable amount of leakage from the seal indicates that seal faces have been damaged and need to be
replaced. ThelLifetime of a seal generally depends on fluid cleanliness and levels of foreign particles and
iabrasiveness.
• Check electrical current of motor frequently. Detecting higher consumption of Ampere values
indicates jamming or friction inside the pump.

13
• During reassembly, make sure that O-Rings have been placed correctly, not squashed or stuck.
• Place pump on base plate / chassis, mount driver, and then connect suction and discharge pipelines.
F4- Seals
F4.1- Mechanical Seals
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
• Typically mechanical sealsdo not require any maintenance unless visible leakage is detected. At the same
time, seating of mechanical seal should be checked frequently.
• Follow instructions from mechanical seal manufacturer and never run mechanical seal dry.
• Flushing of mechanical seals used in lobe pumps is specially made by North Ridge and applied for
pumps transferring certain typesof liquids.
driven shafts out of the pump.
F2- Repairing Pump
• Check all surfaces in contact with the liquid.
• All parts damaged by wearing should be replaced with new ones to avoid losses in flow rate and pressure.
F3- Reassembling Pump
• All assembly instructions given in F1 Section should be repeated in reverse order. See attached assembly
F1- Disassembling Pump
• Close all valves on suction and discharge lines. Empty liquid by opening pump's cover.
• Remove all protecting covers on coupling and shaft.
• Detach pump by disconnecting suction and discharge flanges along with auxiliary pipelines.
• Detach pump completely by disconnecting it from motor/geared motor and from chassis.
• Remove adjusting nut that connects ball bearing with bracket.
• Remove coupling part on pump shaft by a puller, then remove coupling key on the shaft.
• After removing cover bolts and hold screws of mechanical seal, remove gears by pulling out both driving and
section drawing.
• Apply stuffing material (i.e. graphite, silicone) on contact faces and bolts before establishing
reassembling. Use lubricant oil in case mentioned materials are not available.
• Do not reuse removed gaskets. Use new O-Rings and gaskets with the same dimensions.
• Place bushing and bearing on bracket for assembly. Attach casing with bracket. Place back rotor and shaft
from cover side. It is important to place mechanical seal or packing press at the same time. Adjust spacing
between cover and rotor by tightening adjusting nuts.

14
G. SECTION VIEW DRAWINGS
No
PART NAME
1
DRIVEN SHAFT
2
BALL BEARING
3
SPACER
4
DRIVING SHAFT
5
CASING
6
BEARING COVER SEAL
7
BEARING COVER
8
LIP SEAL
9
LIP SEAL SOCKET
10
LOBE CASING
11
LOBE
12
SHAFT COVER
13
PUMP COVER
14
COVER JACKET
15
CASING COVER
16
LOCK WASHER
17
LOCK NUT
18
GEAR
19
BACK COVER
20
SHEET METAL BASE
21
FLUSH
22
MECHANICAL SEAL
Table 3.
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488

15
Malfunction
Possible Causes
Fixing Methods
Wrong rotation direction
Reverse rotation direction
Air pockets in suction line
Fill suction line manually and vacuum all air
left by discharging
Check valve jammed
Clean check valve
Insufficient sealing; due to
incorrect pump
connecting/assembly, caused to air
sucking from suction line or shaft
felt
Check and seal suction line. Change pump’s
seal if necessary
Insufficient
Capacity and/or
Pressure
Check valve jammed
Clean check valve
Air leakage
Check and seal suction line. Change pump’s
seal if necessary
High NPSH –Net Positive Suction
Head
Shorten and/or enlarge suction line diameter.
Reduce manometric suction head
Pump is worn
Check rotor gear spacing. Decrease gap by
removing washers if necessary
Safety valve / Relief valve (Bypass)
activates early or never closes
Adjust activating pressure,
Check valve mechanism
Pump make
noise
Cavitation –manometric suction
head is very high
Shorten and/or enlarge suction line diameter.
Reduce manometric suction head. Check
filters / drainers on suction line.
Rotor / gear damage
Check gears and change if necessary
Wrong alignment of Pump / driving
shaft
Correct using washers and wedges
Increase pressure on spring or change if
necessary
Table 4
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
Pump is not
delivering
liquid while
working
(No Flow)
Vibration noise coming from safety
valve
H. MALFUNCTIONS, POSSIBLE CAUSES AND FIXING METHODS
Possible causes and rectification methods for malfunctions which may occur during operation of our
rotary lobe pumps.

16
İ. PUMP DIMENSIONS
All dimensions are in mm - millimeter.
PUMP
CODE
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
R
Kg
Standard
Inlet
Max
Outlet
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
130
2½"
3"
451
93
216
260
192
375
127
350
ø17
172
35
216
65
55
14x9
ø45
144
180
3"
4"
458
100
216
260
192
375
127
376
ø17
172
43
216
65
55
14x9
ø45
152
355
6"
591
143
300
360
228
444
158
542
ø21
210
66
270
100
85
16x10
ø55
256
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
RLP4 090 2½" 3" 384 93 180 220 152 295 104 330 ø14 140 58 180 47 40 10x8 ø38 86
RLP5
285 4" 580 110 300 360 228 444 158 484 ø21 210 54 270 100 85 16x10 ø55 236
RLP6
012 1" 1" 266 58 140 170 116 220 86 212 ø14 90 27 120 45 30 6x6 ø22 35
018 1½" 2" 271 75 140 170 116 220 86 250 ø14 90 33 120 45 30 6x6 ø22 37
023 1½" 2" 276 75 140 170 116 220 86 268 ø14 90 37 120 45 30 6x6 ø22 40
062 2" 2½" 374 83 180 220 152 295 104 290 ø14 140 48 180 47 40 10x8 ø38 79
RLP2

17
J. SAFETY COVERS
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488

18
K. SPARE PARTS LIST
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
RLP 2 Spare Parts List –Sealed w/ Mechanical seal

19
North Ridge Pumps Registered in England and Wales 03652700.
Registered Office: 12 Bridgford Road, West Bridgford, Nottingham, NG2 6AB . VAT No. GB324963488
RLP 4 Spare Parts List –Sealed w/ Mechanical seal