Colfax CIG Mechanical Seal, CIG Series Service Manual

PRODUCT SERVICE MANUAL

FOR

CIG Mechanical Seal

Double Pumps

The Imo General Installation Operation, Maintenance, and
Troubleshooting Manual, (No. SRM00046), as well as all other
component manuals supplied with these type units should be read
thoroughly prior to pump installation, start-up, operation, maintenance
or troubleshooting.

SRM00051 REV. 03 (14-0302) AUGUST, 2014

WARNING

A

READ THIS ENTIRE PAGE BEFORE PROCEEDING

CAUTION

ATTENTION

ATTENTION

FOR THE SAFETY OF PERSONNEL AND TO PREVENT DAMAGE TO THE EQUIP­MENT, THE FOLLOWING NOMENCLATURE HAS BEEN USED IN THIS MANUAL:

D A N G E R

Failure to observe the precautions noted in this box can result in severe bodily
injury or loss of life.

W A R N I N G

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.

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 .......................................................................................... A

A. GENERAL INSTRUCTIONS ................................................................................................... 1

B. INTRODUCTION .................................................................................................................... 1

C. DESCRIPTION OF EQUIPMENT ........................................................................................... 1

D. PUMP MODEL IDENTIFICATION .......................................................................................... 2

E. ORDERING INSTRUCTIONS .................................................................................................. 3

F. OPERATION ............................................................................................................................. 3

G. PUMP DISASSEMBLY PROCEDURES .................................................................................. 3

H. INSPECTION OF PARTS ........................................................................................................ 6

I. MACHINING INSTRUCTIONS ................................................................................................ 6

J. SPARE PARTS AND KITS ....................................................................................................... 8

K. PUMP REASSEMBLY PROCEDURES ................................................................................... 9

L. TROUBLESHOOTING ............................................................................................................... 13

If operation of this pump is critical to your
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

be accomplished.

business,

after

internal inspection

we strongly

can

1

A. GENERAL INSTRUCTIONS

WARNING

strictly

Imo

resulting

The instructions found herein cover the disassembly, assembly and parts identification of CIG mechanical
seal double 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 the Imo General Installation Operation,
Maintenance, and Troubleshooting Manual, (No. SRM00046), provided with your order. For further
detailed information and technical assistance please refer to Imo Pum p, Technical /Customer Service
Department, at [phone].

This manual cannot possibly cover every situation connected with the installation, operation, inspection, and
maintenance of the equipment supplied. Every effort was made to prepare the text of the manual so that engineering
and design data is transformed into the most understandable wording. Imo Pump must assume the personnel
assigned to operate and maintain the 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.

If installation, operation, and maintenance instructions are not correctly and
followed and observed, injury to personnel or serious damage to pump could result.
Pump cannot accept responsibility for unsatisfactory performance or damage
from failure to comply with instructions.

B. INTRODUCTION

This instruction manual covers CIG single mechanical seal double pumps. This series of pumps has been designed
for use in hydraulic, lubricating seal and fuel oil applications. The model and design construction of each pump can
be identified by the designator code on the pump nameplate. Definitions of model designators are identified in Figure 1.

C. DESCRIPTION OF EQUIPMENT

The CIG mechanical seal double pumps are positive displacement, internal gear pumps consisting of a single shaft
that runs through the center of pump housings. This shaft drives the external gears (pinion gears) which in turn
drives the internal gears (ring gears). Fluid is carried between the internal and external gear teeth of each pump
and is discharged as the teeth mesh. The pinion and ring gears are separated in each pump by a crescent which
is a sealing element in the pump between inlet and discharge ports.

2

D. PUMP MODEL IDENTIFICATION

This instruction manual covers the Imo CIG mechanical seal double pump design.
The model of each pump is identified on the pump nameplate. Refer to Figure 1 for instructional keys when using

this manual.

Double Pump Model Key: CIG 52 050/32 012 RL I/D/E P/W

Series
Front Pump Frame Size

(2, 3, 4, 5, 6, 8)
Pressure Rating

2 = Single Stage
Nominal Displacement

In CM3/Rev.
Back Pump Frame Size

(2, 3, 4, 5, 6, 8)

Mechanical Seal Version Suffix
P – Petroleum Base Fluids (Standard)

W – Low Viscosity Fluids Modification
I – Internal Drain Standard)

D – External Drain For High Suction

Pressure

E – External Drain For Low Viscosity

and Normal Suction Pressure
R – CW Rotation (Standard)
Pressure Rating

1 = Single Stage (Low Pressure)
2 = Single Stage (High Pressure)

L – CCW Rotation

Nominal Displacement
In CM3/Rev.

Figure 1 – Double Pump Configuration

3

E. ORDERING INSTRUCTIONS

CAUTION

ATTENTION

Operating conditions, such as speed, fluid viscosity, temperature, inlet pressure, discharge

CAUTION

ATTENTION

When corresponding with Imo Pump regarding CIG Single Series pumps, refer to the pump nameplate, this
instruction manual, and the assembly drawing as instructed below:

1. From pump nameplate, record the pump model number. Also record the manufactured lot number and date (these
are stamped on the housing near the nameplate).

2. Record instruction manual number, revision and date.

3. From the instruction manual, record the figure numbers that apply to the replacement part(s)

4. From the assembly drawing or instruction manual (see Table 1, Pump Parts List) provide the IDP number(s)
and names for the replacement part(s).

5. Give the above information to your Imo service representative. Imo sales and service representatives are
listed herein and in Imo General Installation Operation, Maintenance, and Troubleshooting Manual, (No.
SRM00046).

F. OPERATION LIQUID LIMITATIONS

Never operate with fluids that are corrosive to iron, steel, aluminum or bronze. The pump is designed for fluids having
the general characteristics of oil.

pressure, filtration, duty cycle, drive type, mounting, etc. are interrelated. Due to these variable
conditions, the specific application limits may be different from that of the operational
limitations. This equipment must not be operated without verification that operating
requirements are within its capabilities.

G. PUMP DISASSEMBLY

Refer to Assembly Drawing 1

1. Remove drive key (36).

2. Remove capscrews (38) and end cover (15) with O-ring (35).

3. Remove capscrews (17).

In next step, ring gear (20), pinion (19) and key (21) will be removed. If ring (20) and
pinion (19) are to be reused, identify them, with a marker or the like, so it can be determ ined
to which housing they belong (if there is more than one housing in pum p) and which direction
face of each gear was positioned in housing. Do not mark with scribe o r punch as this may leave
a burr or high spot which could lead to pump damage or seizure. If key (21) is to be reused,
mark it so that it can be assembled into its original stage and facing its original direction.

4. Remove square gear housing (7), ring gear (20), pinion gear (19) and key (21) from shaft (6). Do not permit
dowel pin (22) to drop as housing (7) is removed. Remove dowel pin (22) from either square housing (7),
intermediate flange (5) or back of round housing (14) whichever is applicable.

NOTE: If square gear housing (7) will not slide easily off shaft (6), and rear pump is a one stage unit, clamp

pump in a vise with squar e hous i ng (7) f ree. Posi tio n a wedg ing de vice between the square hous ing ( 7)
and intermediate flange (5). Pry gap until the square housing (7) if free to slide off shaft (6). If pump has
more than one stage, clamp round housing (14) in a vise with square housing (7) free. With A soft-headed
hammer, tap alternate ly on corners of squar e housing (7) until there is sufficient gap between square

housing (7) and back of round housing (14) to insert a wedging device. Pry the gap until square housing
(7) is free to slide off shaft.

4

CAUTION

ATTENTION

CAUTION

ATTENTION

CAUTION

ATTENTION

Take care not to damage either faces that are being pried against or 0-ring (010) with
prying device.

CAUTION

ATTENTION

If intermediate flange (5) will not slide off easily because its sleeve bushing (53) was

CAUTION

ATTENTION

Take care not to damage either faces that are being pried against or 0-ring (41) with prying

CAUTION

ATTENTION

If the shaft had to be hammered to remove the square gear housing (4) from the shaft,

Take care not to damage either faces that are being pried against or 0-ring (10) with prying
device.

If gear housing (7) will not slide off easily because its bushing (53) was seized on shaft
(6), ball bearing (31) was most likely damaged when housing (7) was pried off and must
be replaced. On the other hand, if gear hous ing (7) wi ll not s lide of f easil y becau se its
rabbet was jammed in housing tube (23) or intermediate cover (5) counter bore,
whichever is applicable, ball bearing (31) may not have to be replaced.

NOTE: If housing (7), ring gear (12) or pinion gear (11) cannot be removed without applying excessive force, unit

should be returned to Imo for further disassembly and inspection.

5. Remove O-ring (10) from intermediate flange (5) if it did not come off with last housing removed.

6. Remove capscrews (39) and washers (34). (Washers not used on single stage units.)

7. Remove intermediate flange (5) from shaft (6). Do not permit dowel pin (37) to drop as intermediate flange (5)
is removed. Remove dowel pin (37) from housing (4).

NOTE: If intermediate flange (5) will not slide easily off shaft (6), insert prying device between intermediate

flange

(5) and square housing (4) and pry apart.

seized on shaft (6), ball bearing (31) was most likely damaged and must be replaced.

8. Remove pinion gear (11) and key from shaft (6) and ring gear (12) from front pump square housing (4).
NOTE: If pinion gear (11) will not slide easily off shaft (6), its key (13) is most likely at least partially sheared.

In this case the disas sembly cannot b e completed in the field without the chance of damaging other
good parts and the unit should be returned to Imo for further disassembly and inspection.

9. Remove square housing (4) from shaft (6). Do not permit dowel pin (37) to drop as square housing (4) is removed.
Remove dowel pin (37) from either square housing (4) or front flange (1), whichever is applicable.

NOTE: If square gear housing (4) will not slide easily off shaft (6), clamp it in a vice with the front cover (1) free.

With a soft-headed h amm er, tap on gear end of s haft (6) unti l there is suff icient gap to i nsert a w edging
device between the square housing (4) and the front cover (1). Pry the gap until square housing (4) is free
to slide off shaft (6).

device.

the ball bearing (31) was damaged and must be replaced.

NOTE: If square housing (4) cannot be removed without applying excessive force, unit should be returned to Imo

for further disassembly and inspection.