Circor IMO C324AXFX-250 User manual

PRODUCT SERVICE MANUAL
FOR
C324AXFX-250/12005 PUMP
WARNING
This Instruction Manual and General Instructions Manual, SRM00046, should
be read thoroughly prior to pump installation, operation or maintenance of
Pump.
SRM00110 Rev. 01 (12-0241) JUNE, 2012

2
READ THIS ENTIRE PAGE BEFORE PROCEEDING
FOR THE SAFETY OF PERSONNEL AND TO PREVENT DAMAGE TO THE EQUIPMENT, THE
FOLLOWING NOMENCLATURE HAS BEEN USED IN THIS MANUAL:
DANGER
Failure to observe precautions noted in this box can result in severe bodily injury
or loss of life.
WARNING
Failure to observe the precautions noted in this box can cause injury to personnel
by accidental contact with the equipment or liquids. Protection should be provided
by the user to prevent accidental contact.
CAUTION
ATTENTION
Failure to observe the precautions noted in this box can cause damage or failure
of the equipment.
Non compliance of safety
instructions identified by
the following symbol
could affect safety for
persons:
Safety instructions
where electrical safety
is involved are
identified by:
Safety instructions which
shall be considered for
reasons of safe operation of
the pump and/or protection
of the pump itself are
marked by the sign:
ATTENTION
CONTENTS
SAFETY AND TABLE OF CONTENTS
2
GENERAL INSTRUCTION
3
INTRODUCTION
3
DESCRIPTION OF EQUIPMENT
3
PUMP MODEL IDENTIFICATION
4
ORDERING INSTRUCTIONS
4
OPERATION
4
PARTS LIST
5
PUMP MAINTENANCE
6
PUMP DISASSEMBLY
6-7
PUMP ASSEMBLY
8-9
INSTALLATION, ALIGNMENT AND TROUBLESHOOTING
12
FIELD AND FACTORY SERVICE AND PARTS
12
ASSEMBLY DRAWING
13
ATTENTION
If operation of this pump is critical to your business, we strongly
recommend yo
u keep a spare pump or major repair kit in stock at all times.
As a minimum, a minor repair kit (o-rings, gaskets, shaft seal and bearings)
should be kept in stock so pump refurbishment after internal inspection can
be accomplished.

3
A. GENERAL INSTRUCTIONS
Instructions found herein cover disassembly, assembly and parts identification of C324AXFX-
250/12005 pump.
NOTE: Individual contracts may have specific provisions that vary from this manual. Should any
questions arise which may not be answered by these instructions, refer to General
Instructions Manual, SRM00046, provided with your order. For further detailed information
and technical assistance please refer to Imo Pump, Technical/Customer Service
Department, at [phone].
This manual cannot possibly cover every situation connected with installation, operation, inspection, and
maintenance of equipment supplied. Every effort was made to prepare text of manual so that engineering
and design data is transformed into most easily understood wording. Imo Pump must assume personnel
assigned to operate and maintain supplied equipment and apply this instruction manual have sufficient
technical knowledge and are experienced to apply sound safety and operational practices which may not
be otherwise covered by this manual.
In applications where equipment furnished by Imo Pump is to become part of processing machinery, these
instructions should be thoroughly reviewed to ensure proper fit of said equipment into overall plant
operational procedures.
WARNING
If installation, operation, and maintenance instructions are not correctly and strictly
followed and observed, injury to personnel or serious damage to pump could result. Imo
Pump cannot accept responsibility for unsatisfactory performance or damage resulting
from failure to comply with instructions.
INTRODUCTION
This instruction manual covers the C324AXFX-250/12005 pump.
DESCRIPTION OF EQUIPMENT
C324AXFX-250/12005 pump is a positive displacement, rotary screw pump consisting of precision bored
housings that encloses a driven screw (power rotor) and two intermeshing following screws (idler rotors).
These screws when rotating form a succession of closures or cavities. As they rotate, fluid is moved axially
from inlet port to outlet port in a continuous, uniform flow with minimum fluid pulsation and pump noise.
Fluid flowing through pump provides lubrication to moving parts.

4
PUMP MODEL IDENTIFICATION
This instruction manual covers Imo C324AXFS-250/12004 pumps. Model of pump is identified on pump
nameplate. Refer to Figure 1 and Table 1 for instructional keys when using this manual.
C 324A X F X -250 / 12500
Design
Modification
Special
Seal
Foot
Mounting
Pump
Series
Power Rotor
Diameter
Special
Customer
Requirements
Special
Pump Suffix
Number
Figure 1 – Definitions of Model Designators
ORDERING INSTRUCTIONS
When corresponding with Imo Pump regarding the C324AXFX-250/12005 pump, refer to pump nameplate,
this instruction manual, and assembly drawing as instructed below:
1. From pump nameplate, record pump model number, serial number and manufactured date.
2. Record instruction manual number, revision and date.
3. From instruction manual, record figure numbers that apply to replacement part(s).
4. From assembly drawing or parts list (see Figure 4A, 4B and Table 2) provide IDP number(s) and
names for replacement part(s).
5. Give above information to your Imo service representative.
Imo sales and service representatives are listed herein and in General Instruction Manual, SRM00046.
F. OPERATION
F.1LIQUID
CAUTION ATTENTION
Never operate with thin liquids su
ch as solvents or water. Imo Pump has
approved the use of this pump model on a specific process type fluid.
F.2 OPERATING LIMITS
CAUTION
ATTENTION
Operating conditions, such as speed, fluid viscosity, temperature inlet pressure,
discharge pressure, filtration, duty cycle, drive type, mounting, etc., are
interrelated. Due to these variable conditions, specific application limits may be
different from that of operational limitations. Equipment must not be operated
without verifying system’s operating requirements are within pump’s capabilities.

5
Under no circumstances are the following operating limits (specified in Table 1) to be exceeded
without specific approval from Imo Pump.
Table 1 – Normal Pump Operating and Structural Limits
MAXIMUM SPEED--------------------------------------------------------------------------------86 RPM
VISCOSITY (Polymer) ---------------------Falling Ball Viscosity (Norm) ------1000-7000 Poise
MINIMUM – MAXIMUM LIQUID TEMPERATURE-------------------------0 to 185 F (-18 to 85 C)
SPECIFIC GRAVITY------------------------------------------------------------------------------------1.0
MINIMUM INLET PRESSURE---------------------------------------------------2.8 psig (.2 Kg/cm^2)
MAXIMUM DISCHARGE PRESSURE----------------------5-09 psig (35.1 Kg/cm^2) Cont. Duty
DRIVE--------------------------------------------------------------------------------------------Direct Only
MOUNTING--------------------------------------------------------------------------------Foot Mounted
G. PARTS LIST
Table 2 – Pump Part List
IDP
QTY
PART
DESCRIPTION
KIT
*
1
MNMPLT3
MODULE-NAMEPLATE
001 1 S901ES PUMP CASE
0002
24
PP007MCA-44
HEX BOLT 7/8-9 X 2.750
0004
2
S923GC
GASKET
X
0005
4
PP007HCA-36
HEX CAP SCR 1/2-13 X 2.250
XX
0007
2
PP070AE
PLUG 3/8 SHP
0008
1
S904ET-1X3
ROTOR HOUSING
XX
0010
1
S904ET-1X4
ROTOR HOUSING
XX
0011
2
S836BMX9
PIN STOP
XX
0012
1
S838EJX3
SPACER
0013
1
DSC250HK
ROTOR POWER
XX
0014
2
RSC250HE
IDLER ROTOR
XX
0015
1
S803EAJX2
END COVER SUB-ASSEMBLY
0016
1
S810E
COLLAR
XX
0017
1
S902EMX1
END COVER SUB-ASSEMBLY
0018
1
S807EAN
BUSHING
XX
0019
4
S836EFX3
SCREW ADJ
XX
0023
1
S936G
STOP PIN
XX
0025
4
PP001BFA-12
NUT HEX JAM 3/4-16
XX
0026
1
PP030DA-4
KEY-WOODRUFF 1/2 X 1/8
XX
0027
1
PP046KNK
SEAL 1.500 CH 180-12
X
0028
2
PP070AE-4
PLUG 1/4SHP
0029
1
PP029EB-40
KEY 3/8 SQ. X 2-1/2 ALLOY
0036
1
S823EAP
SHIM
XX
0057
1
S806EH
INSERT BUSHING
XX
0096
2
PP035CB-5
PIN STRAIGHT 1/8 X 5/16
0098
4
PP002ABH-8
WASHER,HARDENED CIRCULAR
0100
2
PP070AA-4
PLUG, PIPE SOC. HD 1/4
X= Minor Repair Kit Item
XX = Major Repair Kit Item (Items marked (X) are included in Major Repair Kit)

6
H. PUMP MAINTENANCE
WARNING
Failure to observe precautions while installing, inspecting, and maintaining the pump can
cause injury to personnel from accidental handling of liquids that may harm skin or
clothing, or fire hazard risks from flammable liquids, or injury from high pressure fluid jets.
DANGER
BEFORE working on equipment, make sure all power to equipment is disconnected and
locked-out.
H.1 GENERAL COMMENTS
NOTE: Part number identifiers (IDPs) contained within parenthesis such as (10) refer to the circled
numbers shown on the assembly drawing. See Table 2. Figure 4A and Figure 4B.
H.2 TOOLS REQUIRED
The procedures described in this manual require common mechanics hand tools, a torque wrench,
dial indicator and suitable lifting device (such as) slings, straps, etc.
H.3NYLOK FASTENER TORQUE PROCEDURE
The required torque stated on the assembly drawing does not include the additional torque required
to install fasteners containing Nylok inserts (pellets, strip, patch, ring collar). The torque required for
the first application is much higher than it is for subsequent applications. To insure the required
preload on a Nylok fastened joint is achieved for each application, the following procedure is
mandatory assembly practice.
Step 1. Using a suitable torque wrench, install the fasteners in the mating piece until the Nylok insert
is completely engaged. Note the torque required.
Step 2. Add the torque measured in Step 1 to the torque value called for on the assembly drawing.
Step 3. Complete by tightening the fastener to the torque value determined in Step 2 above.
I. DISASSEMBLY PROCEDURES
Note: To service mechanical seal, perform Section I. ONLY.
CAUTION
Fluid leakage from disassembly of pump may make the floor slippery and can cause
personal injury.
NOTE: The C324AXFX-250/12005 pump incorporate highly finished precision parts that must be
handled carefully to avoid damage to critical machined surfaces. The parts removed should
be tagged for identification and their exact positions in the pump carefully noted so that new
parts, or the same parts, are properly replaced without damage.
I.1 SERVICING THE MECHANICAL SEAL
The mechanical seal supplied is a Chesterton 180 Cartridge type. PP046KNK is Imo Pump’s assigned
part number. If a sealing problem develops, it is recommended the complete cartridge be returned to
the nearest Chesterton repair facility for evaluation and possible rebuild or contact the Imo Pump
Service Department for assistance.

7
I.1.1 SEAL REMOVAL
Step 1. Re-install the centering clips finger tight, ensuring the clip is toward the cartridge gland.
Step 2. Loosen the gland bolts (5).
Step 3. Tighten centering clip cap screws 1/8 turn (roughly 20 in-lbs. (2.26 Nm)).
Step 4 Loosen all set screws in the locking ring.
Note: If you are troubleshooting an improperly centered gland, proceed to Seal
Installation (Section I.1.2), Step 5. Otherwise, disregard this note.
Step 5. Remove gland bolts (5) and washer (98).
Step 6 Grasp cartridge gland and slide mechanical seal cartridge assembly from power rotor (13)
shaft. Remove gland gasket from gland face.
I.1.2 SEAL INSTALLATION
Note: Mechanical seal elastomers are Kalrez. Lubricate the mechanical seal elastomers prior
to installation with a clean silicone based lubricant that is process compatible.
CAUTION
When installing/repositioning the seal make sure the centering clips and socket head cap
screws are engaged. If for any reason centering clips are loosened prior to installation,
tighten cap screw finger tight then turn cap screw 1/8 turn (roughly 20 in-lbs. (2.26 Nm)).
Step 1. Assure that all components are free of nicks and burrs.
Step 2. Install gland gasket to gland face.
Step 3. Make sure all screws are engaged in the lock ring but do not protrude into the ID
bore.
Step 4. Install pipe plugs (100) in the quenching ports.
Step 5. Slide the completely assembled Chesterton 180 mechanical seal onto the shaft by
pushing on the lock ring.
Step 6. Install washers (98) and gland bolts (5). Tighten the gland bolts (5) evenly to 15 + 2
ft-lbs. (20.3 +2.7 Nm).
Step 7. Place power rotor (13) in the middle of its .015 to .020 inch total axial movement.
IMPORTANT: All dog point set screws must be tightened FIRST.
Step 8. Evenly hand tighten dog point set screws. Evenly hand tighten cup point set screws.
Step 9. Retighten the six set screws (dog point first) to 55 + 5 in-lbs. (6.2 + .56 Nm).
Step10. Loosen cap screws holding centering clips in place. Remove centering clips and store
away for later use.

8
Step 11. Make sure that the gland is properly centered over the sleeve by turning the shaft by hand
to ensure the seal turns freely. If metal to metal contact is heard inside the seal, proceed
to Seal Removal (Section I.1.1). Complete Steps 1-4.
Step 12. If metal to metal contact still exists, check the centering of the stuffing box.
I.2 BEGIN PUMP DISASSEMBLY
Note: Disassembly and assembly steps are for pump types listed in this manual. Part
numbers correspond to assembly drawings for each step except where noted. Refer to Figure
1 for pump identification and model designator definitions. The model of each pump is
identified on the pump nameplate.
Step 1. De-energize driver, lock and tag “OUT OF SERVICE”. Close isolation valves and drain
piping. Remove shaft coupling. Remove pump coupling hub and key (29).
Step 2. Remove Chesterton 180 Cartridge mechanical seal (27) per instructions outlined in
Servicing Mechanical Seal (Section I.1).
Step 3. Remove outboard end cover bolts (2) and remove outboard end cover (15) and gasket (4)
from pump case (1).
Step 4. Grasp power rotor (13) and pull idler rotors (14) and power rotor (13) from non drive end
rotor housing (10).
CAUTION
DO NOT permit idlers (14) to drop as they emerge from housing (10).
NOTE: As rotors slide from housing, wrap the rotors with a sling to prevent accidental dropping and
to assist in holding the rotors in mesh for easy removal.
Step 5. Remove inboard end cover bolts (2) and remove inboard end cover (17) and gasket (4)
from pump case (1). Removal of inboard end cover (17) will include bushing (18), anti-
rotation pin (23), bushing insert (57), and bushing insert anti-rotation pins (96). Remove
bushing anti-rotation pin (23) from inboard end cover (17). Lightly tap or evenly press
bushing (18) from inboard end cover (17). Remove bushing insert (57) from bushing (18).
Step 6. Remove plugs (7) from case (1). Remove anti-rotation pins (11) match marking each one
to identify correct installation position and angle. Each pin is fitted to its housing during
assembly. If new housings are to be installed, new anti-rotation pins are required for
correct fitting. Thread a 3/8-16 inch bolt in end of stop pin to assist in removal.
CAUTION
DO NOT drop housings as they emerge from case.
Step 7. Slide inboard rotor housing (8) from inboard end of pump case (1). Slide outboard rotor
housing from outboard end of pump case (1). Removal of rotor housing will include
housing adjusting screws (19) and jam nuts (25). Remove Spacer (12) from pump case
(1).
Note: If a major kit is to be installed it is not necessary to disassemble thrust collar (16), woodruff
key (26) and shim (36) from power rotor (13) or adjusting screws (19) and jam nuts (25) from
rotor housings (8 & 10). All of these items are included in the major kit.

9
J. PUMP ASSEMBLY PROCEDURE
Notes: Prior to reassembly of pump, all parts should be cleaned and inspected for nicks and burrs.
Replace all worn or damaged parts. Imo Pump recommends automatic replacement of
gaskets, O-rings, bearings and mechanical seal when these parts are disturbed from their
previously installed positions. Coat all parts with light lubricating oil to assist in assembly.
Pump model covered in this instruction manual is provided with a Chesterton 180 cartridge type
mechanical seal equipped with Kalrez elastomers. Imo Pump recommends coating all pump
components with a silicone based lubricant during pump assembly.
If new rotor housings (8 & 10) are installed when performing Step 1, new anti-rotations pins (11) must
be installed. Anti-rotation pins are to be field fitted to each new housing to ensure housing maintains
alignment with pump case and opposite housing. If housing anti-rotation pins are not snugly fitted to
one housing, opposite housing may rotate out of position during pump operation and damage rotors.
To fit new anti-rotation pins, file or grind one or both pins flat surfaces until pin fits snugly into housing
slot. Do not over grind flats.
Step 1. Install jam nuts (25) and adjusting screws (19) to rotor housings (8 & 10). Install nuts and
screws loosely, do not tighten at this time.
Step 2. Install spacer (12) to pump case (1) bore, align opening in spacer with discharge port
opening. Align anti-rotation pin slot in housing to pin hole on side of case flange. Slide drive
end rotor housing (8) into pump case (1) inboard end. Repeat for non drive end rotor
housing (10) assuring that rotor housing end faces are fully seated against spacer (12)
faces. To assist in aligning housing bores, install idler rotors (14) into idler bores. Rotate
rotor housings until idlers slide back and forth freely without binding. When rotor housing
bores are aligned, install anti-rotation pins (11) per above note. Slide idler rotors back and
forth again ensure no binding exists. Install pipe plugs (7).
Step 3. Install shaft bushing (18) to inboard cover (17). Using anti-rotation stop pin (23) as a pilot
hole, drill a 7/16 – inch hole through the bushing. Make sure the bushing flange remains
seated against the inboard cover counter-bore when drilling. Remove the bushing from the
inboard cover and de-burr the drilling. Install bushing insert (57) and install bushing (18) in
inboard cover (17). Install stop pin (23) in inboard cover (17).
Step 4. Set the rotor housing adjusting screws by the following directions: Rotor housing adjusting
screws (19) at inboard and outboard ends of the pump should be set following the directions
outlined in Figures 2 and 3. To verify correct setting of adjusting screws (19), wipe bluing or
place fuse wire on adjusting screw heads and install inboard end cover (17) with gasket (4)
and bolts (2). Torque bolts to 50 ft-lbs. (67 Nm). Remove inboard end cover and verify
adjusting screw contact with inboard end cover.
CAUTION
DO NOT exceed .003” (.08 mm) squeeze on adjusting screws
When correct adjustment is confirmed, re-install gasket (4) and inboard cover (17) using bolts (2).
Torque bolts (2) to 155 + 10 ft-lbs. (189 + 13 Nm).
Repeat above procedure for outboard end cover (15) following directions outlined in Figure 3. When
correct adjustment is confirmed for the outboard end cover, proceed to Step 5 before final installation
of outboard cover (15).

10
Figure 2 - Set Adjustment Screws, Inboard End
Using a parallel bridge, measure and record distances “Q” and “X” on inboard end cover (17).
Subtract “Q” from “X” and add .009” (.23 mm) (60% of gasket (4) thickness) to this number. Set
adjusting screws to this distance from housing end face to adjusting screw end face.

11
Figure 3 - Set Adjustment Screws, Outboard End
Measure and record distance “Y” of flange face of outboard end cover (15) to counter-bore face. Add
.009” (.23 mm) (60% of gasket (4) thickness) to this number. Make sure rotor housing (8), (10) are
seated against inboard housing adjusting screws. Measure and record distance “W” from case (1)
end flange to housing (10) end face. If housing (10) is below the case end face, add distance “W” to
the total distance “Z” + .009” (.23mm). Set adjusting screws to this distance from housing end face to
adjusting screw end face.

12
Step 5. Installation of Rotors and Setting Power Rotor End Clearance
Install woodruff key (26) in power rotor (13) key slot and install thrust collar (16) on key and
power rotor shaft. Seat squarely against shoulder. Slide power rotor (13), into outboard end
of pump. Install outboard end cover (17) and gasket (4) to case using bolts (2). Torque
bolts (2) to 85 + 10 ft-lbs. (115 + 19 Nm). Mount a dial indicator to inboard end cover (17)
and place indicator needle on power rotor coupling end face. Push power rotor axially into
pump until contact is made with outboard end cover. Zero bezel on dial indicator, then pull
power rotor axially out of pump until thrust collar contacts busing insert. Read and record
total axial movement of power rotor. Measure the thickness of laminated shim pack (36).
Reduce shim pack thickness by peeling away laminations until thickness is .015 to .020
inches (.38 to .51 mm) less than total power rotor axial movement. Remove outboard end
cover (15) and power rotor from pump. Remove thrust collar (16) and woodruff key (26)
from power rotor. Slide adjusted shim pack (36) onto power rotor shaft then install woodruff
key (26) and thrust collar (16). Make sure shims and thrust collar are seated squarely
against power rotor shoulder. Mesh threads of idler rotors onto power rotor and slide rotor
set into pump from outboard end. Re-install outboard end cover (17) and gasket (4) using
bolts (2). Torque bolts (2) to 155 + 10 ft-lbs. (189 + 13 Nm). Verify .015 to .020 inches (.38
to .51 mm) power rotor total axial movement using the dial indicator. Repeat above if
correct axial movement is not achieved.
Step 6. Install Chesterton 180 cartridge mechanical seal (27) per instruction in Mechanical Seal
Section of this manual. See Section I.1.2.
K. INSTALLATION, ALIGNMENT, AND TROUBLESHOOTING
For instructions regarding Installation, Alignment and Trouble shooting see General Instruction Manual,
SRM00046.
L. FIELD AND FACTORY SERVICE AND PARTS
Imo Pump maintains a staff of trained service personnel that can provide pump installation, pump start-
up, maintenance/overhaul and troubleshooting supervision as well as installation and maintenance
training.
Our factories provide maintenance as well as overhaul and test facilities in the event user prefers to
return pumps for inspection or overhaul. Pumps that have been factory-overhauled are normally tested
and warranted “as-new” for a period of one year from date of shipment. For either field service or
factory overhaul assistance, contact your local Imo Sales Office or representative at the
Technical/Customer Service Department in Monroe, NC, USA.
Most pumps have repair kits available. Minor Repair Kits are used to repair leaking seals, bad bearings
and/or for re-assembly after pump tear-down. They include (as applicable) pump shaft seals, packing,
all gaskets/O-rings and bearings. Major Repair Kits are sufficient to rebuild completely worn-out pumps
to “as-new” condition. They include all parts found in Minor Repair Kits plus all major internal parts
subject to wear. Since kits have all necessary parts, it is preferred that they be purchased rather than
selecting individual parts. When parts are individually selected from Parts List, some needed
components are often overlooked. In addition, mixing worn or used parts with new parts risks rapid
wear and shortened service life from new parts.

13

14
Circor
1710 Airport Road
PO Box 5020
Monroe, NC USA
28111.5020
Tel: 1+ [phone]
Email: [e-mail]
Web: www.circorpt.com
© 2020 CIRCOR Pumps North America, LLC. all rights reserved.