Circor IMO 3E Series Troubleshooting guide

PRODUCT SERVICE MANUAL
AND
PARTS LIST
FOR
3E SERIES PUMPS
ROTOR SIZES 143, 143J AND 162
WARNING
This Special Instruction Manual and General Installation, Operation,
Maintenance, and Troubleshooting Manual Three Screw and CIG Pumps
(SRM00046) should be read thoroughly prior to pump installation,
operation or maintenance.
Manual: SRM00018 Rev. 04 (20-0051) February 2020
1

2
READ ENTIRE PAGE BEFORE PROCEEDING
FOR SAFETY OF PERSONNEL AND TO PREVENT DAMAGE TO 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 precautions noted in this box can cause injury to personnel by
accidental contact with equipment or liquids. Protection should be provided by user to
prevent accidental contact.
CAUTION ATTENTION
Failure to observe precautions noted in this box can cause damage or failure of
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 Instructions ................................................................................................................3
Introduction and Description....................................................................................................3
Pump Model Identification .......................................................................................................3
Ordering Instructions ...............................................................................................................4
Operation … ............................................................................................................................4
Parts List ….............................................................................................................................5
Maintenance, Bearing & Seal Installation................................................................................6
Disassembly and Assembly Instructions .................................................................................6
Trouble shooting......................................................................................................................9
Field and Factory Service and Parts.............................................................................................9
Pump Assembly Drawings............................................................................................... 10-18
ATTENTION
If operation of this pump is critical to your business, we strongly recommend
you 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 3E-143, 143J and
162 pumps.
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
Installation, Maintenance and Trouble Shooting 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 the 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.
B. INTRODUCTION
Instruction manual covers 3E-143, 143J and 162 series pumps. Specific models covered by this manual
are identified in Table 2. Model of each particular pump is identified on pump end cover. Refer to Figure 1
for definition of model designator. Refer to assembly drawing corresponding to your pump model, Figures 3
through 11 as you use this instruction manual.
C. DESCRIPTION OF EQUIPMENT
3E-143, 143J and 162 series pumps are positive displacement, rotary screw pumps consisting of precision
bored housings which enclose a driven screw (power rotor) and 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.
D. PUMP MODEL IDENTIFICATION
This service manual covers Imo Series 3E-143, 143J and 162 pumps. The model of each pump is identified
on pump nameplate. Refer to figure 1 and table 1 for instructional keys when using this manual.

4
Figure 1 – Definition of Model Designators of 3E Series Pumps
E. ORDERING INSTRUCTIONS
All correspondence pertaining to renewal parts for equipment must refer to instruction manual number and
should be addressed to nearest Imo representative. Handling of renewal orders will be greatly facilitated if
following directions are carefully observed:
1. Provide number of instruction manual with revision level and date.
2. Provide serial number of pump for which part is desired. This number appears on pump nameplate.
3. Identify kit (Minor or Major) required.
Imo sales and service representatives are listed herein and in General Installation, Maintenance and
Trouble Shooting Manual, SRM00046.
F. OPERATION
F.1 LIQUID LIMITATIONS
CAUTION ATTENTION
Never operate with thin liquids such as solvents or water. Pump is designed for liquids having
general characteristics of oil.
F.2OPERATING 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 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 – Pump Operating and Structural Limits
Maximum Speed…. 4000 RPM for Type B and H seals
3500 Rpm for Type H and J Seal
Up to 7000 Rpm for Type I Pumps. Contact factory for exact speeds.
1800 rpm for #6 fuel oil, crude oil and fluids known to contain fine abrasives
Viscosity……………Type B and I Pumps – 33 to 3000 SSU (2 to 650 Cst)
Type H Pumps – 33 TO 25,000 SSU (2 to 5400 Cst)
Type N ad J -60 to 5000 SSU (10 to 1100 Cst)
Temperature……… Type B Mechanical Seal - 0° to 180°F [-17 C to 82.2 C]
Type H Mechanical Seal, Integral Mounted Pumps, and Packing Pumps - 0°
to 250°F [-17 to 121 C]
Suction Pressure.....Type 3EB and 3EH, 3EI - 75 PSIG Maximum [1.72 bar Maximum]
Type 3EJ and 3EN – 250 psig
-....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................-
Drive .................................................................................................................................Direct Only
Maximum Differential Pressure ..........................................................................150 PSIG [10.3 bar]
Filtration……………Light Fluids – 60 mesh
Heavy Fluids – 1/16 to 1/8 inch [1.58 mm to 3.17 mm]
F.3 Pump Weights: Foot Mount – 36 LBS [16.4 KG] C-Face = 32 LBS [14.5 KG]
F.4 Pump Airborne Noise levels are expected to be less than 70 dBA.
G. PARTS LIST
Table 1 – List of Material
Item Qt
y
. Part Description Item Qt
y
Part Description
1 1 Case/Housin
g
16
(
1
)
1 Seal
2
(
2
)
1 Outboard End cover 26
(
1
)
1 Inboard Cover O-Rin
g
3 4 End Cover Hex Bolts 27 4 Inboard Cover Hex Bolts
4 1 Inboard Cover 75
(
2
)
1Housin
g
***
5
(
1
)
1 Inlet O-Rin
g
*
6 4 Bearin
g
Cover Hex Bolts 76
(
2
)
1Housin
g
O-Rin
g
***
7
(
2
)
1 Power Rotor 92 1 Seal Seat
A
dapter
8
(
2
)
2 Idlers 93
(
1
)
1 Seal Seat
A
dapter O-Rin
g
11
(
1
)
1 Ball Bearin
g
96 1 Pipe Plu
g
12 1 Bearin
g
Retainer 97 1 Dowel Pin
13 2 Shaft Ke
y
15 1 or 2** Bearin
g
Snap Rin
g
s
* On 3EJ(N) pumps only
** Qty 2 on 3EJ(N) pumps only
*** Used On Steel Case Pumps Only
NOTE: (1) Minor Repair Kit items (iron and steel case pumps, not including 3EIC).
(2) Major Repair Kit items (steel case pumps only). Items marked (1) also included in
Major Repair Kit.
REPAIR KITS
Minor Repair Kits are available for pumps equipped with mechanical seal and ball bearing. Major Repair
Kits are available for all steel case pumps. Major Repair Kits are not available for iron case pumps because
major repairs are not considered economical. If extensive repair is required to an iron case pump, the pump
should be discarded and a new pump purchased. Repair parts are available only in kit form.

6
H. PUMP MAINTENANCE
WARNING
Failure to observe precautions while installing, inspecting and maintaining 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 contained within parenthesis, such as (3), refer to circled numbers
shown on assembly drawings (Figures 3 through 11).
DANGER
De-energize driver before starting with any maintenance action
H.2 TOOLS REQUIRED
Procedures described in this manual require common mechanics hand tools, a torque wrench, dial
indicators for alignment and a suitable lifting device such as slings, straps, etc.
H.3 Pump Disassembly Procedure
NOTE: For disassembly, use mechanical seal drawing (Figure 2) below and appropriate
assembly drawing per chart 2 below for particular pump types.
Figure 2 - MECHANICAL SEALS

7
Table 2 – 3E-143, 143J and 162 Pump Models Versus Assembly Figure Numbers
Figure Numbe
r
Pump Models
3 C3EIC, C3EICX
4 D3EICS, D3EICSX
5 C3EBC, C3EHC, C3EBTC, C3EHTC, C3EXC, C3EBCX
6 C3EBF, C3EHF, C3EBTF, C3EHTF, C3EXF, C3EXTF
7 D3EBCS, D3EHCS, D3EBTCS, D3EHTCS, D3EXCS, D3EBCSX, D3EBCSTX
8 D3EBFS, D3EHFS, D3EBTFS, D3EHTFS, D3EXFS, D3EHFSX, D3EXTFS
9 D3ENC, D3ENCX, D3EJC, D3EJCX
10 D3ENCS, D3EJCS, D3ENCSX, D3EJCSX
11 D3ENFS, D3EJFS, D3ENFSX, D3EJFSX
CAUTION
Fluid leakage from disassembly of pump may make floor slippery and cause personal injury
1. If pump is an iron case seal-less version C3EIC (See figure 3), it is not repairable. Contact Imo for a
replacement pump. If pump is steel case seal-less version D3EICS (See Figure 4), proceed to step
6 below for disassembly. If pump is any other type, proceed with step 2 below.
2. Remove bearing retainer bolts (6) and bearing retainer (12).
3. Grasp power rotor (7) shaft and pull assembled power rotor (7) from pump. Removal of power rotor
will also remove bearing (11), seal (16), seal seat adapter (92) and snap ring(s) (15).
4. Disassemble power rotor as follows:
a. Remove drive side bearing retaining ring (15) from groove of power rotor (7). Put power rotor (7)
on a press with bottom of seal seat adapter (92) on plate of press. Press power rotor (7) through
bearing (11) and seal seat adapter (92). On high inlet pumps, Figure 9, 10 and 11 only, remove
inner retaining ring (15) from power rotor (7).
CAUTION ATTENTION
Ensure power rotor (7) does not fall to floor when it is pressed off ball bearing (11).
b. Remove seal seat adapter (92) from shaft (7) and stationary seal seat with O-ring from seal seat
adapter (92) and remove O-ring from stationary seal seat. Remove O-ring (93) from groove in
OD of seal sleeve adapter.
c. Remove rotating assembly of mechanical seal (16) from power rotor (7) sleeve as outlined
below:
(1) If single spring seal. Slide rotating assembly from power rotor (7).
(2) If multi-spring type seal. Loosen setscrews and slide rotating assembly from power rotor (7).
5. If only seal (16) is being replaced, disassembly is complete. Follow steps 5, 7 and 8 of reassembly
procedure below to assembly new seal (16) on power rotor (7) and assembly power rotor (7) into
pump. If rest of pump is to be disassembled, proceed to step 6 below.
6. Remove hex bolts (27) and cover (4) from case (1). Remove O-ring (26) from either case (1) or
cover (4). If pump is D3EICS, figure 4, remove power rotor (7) from housing (1).

8
7. Remove bolts (3) and cover (2) from case (1). Clean Loctite gasket eliminator from cover (2) and
flange of case (1). If pump is high inlet pressure type (3EJ(N), Figures 9 and 10) remove O-ring (5)
from cover (2) instead of loctite.
8. Remove idlers (008) from idler bores of housing.
9. If pump is steel case type, see figures 4, 7, 8, 10, 11, Remove housing (75) with O-ring (76) from
case (1) by removing plug (96) and pin (97). Remove O-ring (76) from groove of housing (75).
H.4 Pump Reassembly:
NOTE: Prior to assembly of pump, clean and inspect all parts for nicks and burrs. Replace all worn
or damaged parts. Imo Pump recommends replacement of all O-rings, mechanical seal (25)
and ball bearing when these parts are disturbed from their previously installed positions.
Coat all parts with light lubricating oil to assist in assembly. Inspect power rotor (7) shaft and
remove any nicks or burrs which are present. Polish power rotor shaft to remove any rust or
oxidants that may be present under shaft sleeve.
1. If pump is steel case seal-less version D3EICS (See Figure 4), proceed to step 2 below otherwise
proceed to step 4.
2. Install O-ring (76) in groove of housing (75) and install housing (75) in case (1), ensuring that anti-
rotation groove in housing (75) is aligned with anti-rotation boss in case (1). Install pin (97) and plug
(96).
3. Install power rotor (7) in housing (75).
4. Install O-ring (26) on rabbit of inboard cover (4) and assemble inboard cover (4) to case (1) with hex
bolts (27). Skip to step 9.
5. Assembly Power rotor as follows:
a. Coat power rotor (7) seal area with lubricating fluid, and install seal rotating assembly on power
rotor (7) as below:
(1) If single spring seal, slide rotating assembly on power rotor (7) sleeve until rotating assembly
is positioned next to idler stop.
(2) If multi spring type seal, slide rotating assembly on power rotor (7) sleeve until rotating
assembly is positioned next to idler stop. Tighten seal set screws.
b. Assemble seal seat adapter (92) by installing mechanical seal O-ring in groove in stationary seat
of mechanical seal and then installing stationary seat in seal seat adapter (93). Be sure that pin
in seal seat adapter lines up with slit in back of stationary seat.
c. Apply lubricating oil on running faces of mechanical seal and install seal sleeve adapter (92) on
power rotor (7) with stationary seal seat contacting installed rotating assembly seal face.
d. If pump is high inlet pressure (3EJ(N) type, see figures 9 and 10), install retaining ring (15) into
power rotor (7) groove furthest from shaft coupling end.
e. Install ball bearing (11) by first supporting thread end of power rotor (7) on press and then
pressing ball bearing (11) on power rotor (7) shaft, pressing only on bearing (11) inner race until
bearing either contacts sleeve on power rotor (7), or in case of 3EJ(N) pump, contacts inner
snap ring (15). Install coupling facing snap ring (15) on shaft (7).
CAUTION ATTENTION
Ball Bearing (11) will be damaged if installed by pressing on inner race.

9
6. Assemble inboard cover (4) to case (1) with hex bolts (27).
7. Install assembled power rotor, centering each part as it enters cover (4). NOTE: Sleeve
subassembly (92) drain port is to be aligned with drain port in cover (4).
8. Install retainer (12) on cover (04) using hex bolts (6). Tighten bolts (6) to a torque on assembly
drawing.
9. Install idlers (8) in housing (1) being sure that idler (8) ends with taper face thrust plate (2).
10. Wipe all traces of oil from the mating flanges of cover (2) and flanges of case (1). Install loctite
gasket eliminator #504 on edges of thrust plate (O-ring (5) will be used instead of gasket eliminator
on high inlet 3EJ(N) pumps.) and then install cover (2) on case/housing (1) with hex bolts (3).
Torque bolts to value on assembly drawing.
11. Rotate power rotor to ensure freedom of rotation.
12. Install key (13) and coupling hub on power rotor (7). Install pump on driver and check alignment as
described in Manual Number SRM 00046 (General Installation, Operation, Maintenance, and
Troubleshooting Manual). Prime pump to expel air prior to startup.
I. Troubleshooting
For assistance with troubleshooting see the General Installation, Maintenance and Trouble Shooting
Manual, SRM00046.
J. 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 a test facility in event user prefers to return
pumps for inspection or overhaul. Factory-overhauled pumps 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 Technical/ Customer Service
Department in Monroe, NC, USA.

A
A
SECTION A-A
27
3126 13
4
7
8
8
2
USE LOCTITE GASKET
ELIMINATOR #504
ASSEMBLE PUMP SO THAT END
OF IDLER WITH ROOT TAPER IS
AT INLET END OF PUMP
INLET OUTLET
TORQUE TO
170 u10 LB IN
TORQUE TO
170 u10 LB IN
FIGURE 3 - IRON CASED C3EIC PUMP

3
13
7
8
8
24
27
26
97
96
1
INLET OUTLET
ASSEMBLE PUMP SO THAT END
OF IDLER WITH ROOT TAPER IS
AT INLET END OF PUMP
TORQUE TO
170 u10 LB IN
TORQUE TO
170 u10 LB IN
USE LOCTITE GASKET
ELIMINATOR #504
NOTES:
1.DRAIN HOLE IN COVER (#4) TO BE ASSEMBLED
IN THE DOWN POSITION.
76 75
A
A
SECTION A-A
B B
SECTION B-B
FIGURE 4- STEEL CASED D3EICS PUMP

A
A
SECTION A-A
27
3
1
93 26 92 15 13
12
6
4
11
16
7
8
8
2
USE LOCTITE GASKET
ELIMINATOR #504
ASSEMBLE PUMP SO THAT END
OF IDLER WITH ROOT TAPER IS
AT INLET END OF PUMP
INLET OUTLET
TORQUE TO
170 u10 LB IN TORQUE TO
170 u10 LB IN
TORQUE TO
40 u2 LB IN
AUXILIARY
SEAL DRAIN
NOTES
1. DRAIN HOLE IN COVER IDP #4 TO BE ASSEMBLED
IN THE DOWN POSITION.
FIGURE 5 - IRON CASED C3EB(H)C - C-FACE MOUNTED PUMP

A
A
SECTION A-A
27
3193 26 92 15 13
12 6
4
11
16
7
8
8
2
USE LOCTITE GASKET
ELIMINATOR #504
ASSEMBLE PUMP SO THAT END
OF IDLER WITH ROOT TAPER IS
AT INLET END OF PUMP
INLET OUTLET
TORQUE TO
170 u10 LB IN
TORQUE TO
170 u10 LB IN
TORQUE TO
40 u2 LB IN
NOTES:
1. DRAIN HOLE IN COVER IDP #4 TO BE ASSEMBLED
IN THE DOWN POSITION.
FIGURE 6 - IRON CASED C3EB(H)F - FOOT MOUNTED PUMP

3 6
13
7
8
8
2
4
12
27
15
11
26
92
93
97
96 16
1
INLET OUTLET
ASSEMBLE PUMP SO THAT END
OF IDLER WITH ROOT TAPER IS
AT INLET END OF PUMP
TORQUE TO
170 u10 LB IN
TORQUE TO
170 u10 LB IN
TORQUE TO
40 u2 LB IN
USE LOCTITE GASKET
ELIMINATOR #504
NOTES:
1.DRAIN HOLE IN COVER (#4) TO BE ASSEMBLED
IN THE DOWN POSITION.
A
A
SECTION A-A
BB
SECTION B-B
76 75
AUXILIARY
SEAL DRAIN
FIGURE 7 - STEEL CASED D3EB(H)CS - C-FACE MOUNTED PUMP

3
6
13
7
8
8
2
4
12
27
15
11
26
92
93
97
96 16
1
INLET OUTLET
ASSEMBLE PUMP SO THAT END
OF IDLER WITH ROOT TAPER IS
AT INLET END OF PUMP
TORQUE TO
170 u10 LB IN
TORQUE TO
170 u10 LB IN
TORQUE TO
40 u2 LB IN
USE LOCTITE GASKET
ELIMINATOR #504
NOTES:
1.DRAIN HOLE IN COVER (#4) TO BE
ASSEMBLED IN THE DOWN POSITION.
A
A
SECTION A-A
BB
SECTION B-B
76 75
SEE NOTE 2
FIGURE 8 - STEEL CASED D3EB(H)FS - FOOT MOUNTED PUMP

A
A
SECTION A-A
92
412
15
11
13
627
26 93
16
1
7
8
8
2
35
TORQUE TO
170 u10 LB IN
TORQUE TO
170 u10 LB IN
TORQUE TO
75 u5 LB IN
INLET OUTLET
ASSEMBLE PUMP SO THAT END OF
IDLERS WITH ROOT TAPER IS AT
INLET END OF PUMP
NOTES:
1.DRAIN HOLE IN COVER IDP #4 TO BE ASSEMBLED
IN THE DOWN POSITION.
1/8-27 NPT
1/4-20 UNC-2B
1/4 FULL THREAD
AUXILIARY SEAL DRAIN
FIGURE 9 - IRON CASED D3EJ(N)C - C-FACE MOUNTING

A
A
SECTION A-A
4
12
11
13
6
27
26
16
1
7
8
8
2
3
5
TORQUE TO
170 u10 LB IN
TORQUE TO
170 u10 LB IN
TORQUE TO
75 u5 LB IN
INLET OUTLET
ASSEMBLE PUMP SO THAT END
OF IDLER WITH ROOT TAPER IS
AT INLET END OF PUMP
NOTES:
1. DRAIN HOLE IN COVER IDP #4 TO BE ASSEMBLED
IN THE DOWN POSITION.
B B
SECTION B-B
15
92
93
96 97
76 75
FIGURE 10 - STEEL CASED D3EJ(N)CS - C-FACE MOUNTING

196 97 427 12
6
7
13
9293
26
7576523 8 16
TORQUE TO 131±10 LB IN
TORQUE TO
35±2 LB IN
TORQUE TO 131±10 LB IN
OUTLETINLET
NOTES:
1. DRAIN HOLE IN COVER (IDP 4 & 92)
TO BE ASSEMBLED IN THE DOWN
POSITION
SEE NOTE #1
11
15
ASSEMBLE PUMP SO THAT END OF
IDLER WITH ROOT TAPER IS AT
INLET END OF PUMP
FIGURE 11 - STEEL CASED D3EJ(N)FS - FOOT MOUNT PUMP

CIRCOR
1710 Airport Road
PO Box 5020
Monroe, NC USA
28111.5020
Tel: [phone]
Email: [email protected]
Web: www.circorpt.com
© 2020 CIRCOR Pumps North America, LLC. All rights reserved.
HOW NOW