Circor G3DB Series Datasheet
INSTRUCTIONS AND PARTS LIST
SERIES G3DB/AG3DB ELEVATOR
WARNING
This manual, and GENERAL INSTRUCTIONS MANUAL, CA-1, should
be read thoroughly prior to pump installation, operation or maintenance.
SRM00059 Rev. 05 (20-0051) February 2020
(was G3DB/AG3DB Elevator)
A
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 the 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 per-
sonnel 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
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.
CONTENTS
Safety and Table of Contents ....................................................................................................... A
General Instructions ..................................................................................................................... 1
Ordering Instructions ..................................................................................................................... 1
Introduction ................................................................................................................................... 1
Maintenance.................................................................................................................................. 3
Bearing and Mechanical Shaft Seal Disassembly ........................................................................ 4
Bearing and Mechanical Shaft Seal Resassembly ....................................................................... 5
1
GENERAL INSTRUCTIONS
The instructions found herein cover the disassembly, assembly and parts identification of Series G3DB and
AG3DB pumps.
NOTE: Individual contracts may have specific provision that vary from this manual. Should any questions
arise which may not be answered by these instructions, refer to the General Instructions Manual,
CA-1, provided with your order. For further detailed information and technical assistance please
refer to Imo Pump, Technical Service Department at (704) 289-6511.
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 easily understood wording. Imo Pump must as-
sume 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 prac-
tices which may not be otherwise covered by this manual.
ORDERING INSTRUCTIONS
All correspondence pertaining to renewal parts for the equipment must refer to the instruction manual number
and should be addressed to the nearest Imo representative. The handling of renewal orders will be greatly
facilitated if the following directions are carefully observed:
1. Give the number of the instruction manual.
2. Give the model number of the pump for which the part is desired. This number appears on the nameplate.
3. Designate the desired part by the IDP number and name as listed in Table 1 and pump assembly drawing
in this instruction manual.
INTRODUCTION
This manual covers all sizes of type G3DB and AG3DB Imo pumps for hydraulic elevator service. Field repairs
are generally limited to replacing the mechanical seal and bearing. This manual provides instructions cover-
ing these operations.
INLET POSITION
To remove inlet head, remove the cap screws or bolts (10) and rotate the inlet head to the desired position,
taking care not to damage the gasket (8). A damaged gasket must be replaced. To reassemble, replace the
inlet head, lubricate the threads with oil and retorque the bolts (value given for the particular size pump in
Table 1, page 3.
PIPING
Piping to the pump must be independently supported and not allowed to impose strains on the pump. Such
strains, if imposed, may cause distortion and malfunction of the pump.
WARNING
Prior to adding oil and start-up of your new or replacement pump, clean the tank and flush all
lines free of debris that will have accumulated during fabrication and installation. One large
particle can fail the pump in a fraction of a second.
PRIMING
For those units that do not have an overhead tank, a priming connection in the suction line should be provided.
Prime the pump before initial start-up by pouring hydraulic fluid into the priming point or pump suction. Rotate
the pump slowly by hand until the rotors are wet and the suction line is as full of fluid as possible.
SUCTION LINE
All joints in the suction line must be tight and sealed to prevent air from being drawing into the pump with
negative suction pressure. Position the suction line and/or inlet head so the fluid cannot drain from the pump
while shut down.
2
SUCTION STRAINER
A suction strainer with adequate flow rate and minimum pressure drop should be used to keep contamination
from entering the pump and system. The maximum pressure drop (when dirty) across the strainer plus all
other losses in the pump suction line at maximum fluid viscosity, including static lift, must not exceed the
suction lift capability of the pump. Regular cleaning of the suction strainer must be included in the mainte-
nance of the machine.
Note: Keeping the fluid and system clean is essential in achieving maximum pump life.
BELT DRIVEN PUMPS – ALIGNMENT
Mount the sheaves as close to the bearing retainer as possible. This minimizes the overhung load on the
shaft.
Align the sheaves with a straight edge so their faces are parallel with no offset. Misaligned sheaves can cause
noise, shorten belt life, and may reduce the bearing life of the pump and/or motor.
Apply belt tension according to the belt manufacturer’s recommendations. After tension is applied, recheck
sheave alignment. Do NOT overtension belts. While loose belts slip and wear excessively, excessive belt
tension may cause misalignment, belt failures, and in extreme cases, a shaft failure.
For smooth, quiet, high speed operation, sheaves must be balanced and shaft bores must be concentric with
belting grooves.
When matched belts are removed, they should be kept in sequence and replaced exactly in the grooves from
which they were removed.
DIRECT DRIVEN PUMPS – ALIGNMENT
All pump-driver sets must be checked for proper alignment when the unit is installed and after all piping has
been connected to the pump. Factory alignment will most likely be disturbed during shipment and installation.
A flexible coupling is not intended to permit permanent misalignment. Proper alignment must be established
and maintained to obtain maximum pump life. Follow these steps:
1. Install the pump and/or motor.
2. Before aligning the units, be sure that all stresses are removed from the pump and that the foot of the
pump case fully conforms to its support.
3. Set the coupling end face gap as specified by the coupling manufacturer.
4. Perform rough alignment of the face and rim of the coupling using feelers and a straight edge.
5. Perform the final alignment of the pump and driver shaft using dial indicators. Acceptable alignment has
been obtained when the F.I.R. is less than or equal to .005" in both the face (angularity) and the rim
(parallelism) checks while rotating both shafts together 360°.
6. In special cases, “hot alignment” when the pump and motor are at operating temperature may be required.
Periodically check the alignment of the pump and its driver. Realign as necessary. Maintaining proper align-
ment is necessary for quiet operation and maximum equipment life.
ROTATION
Before connecting the belts our coupling, check the driver rotation to be sure it matches the required rotation
of the pump. Extended reverse rotation may cause damage.
When the coupling is connected and shafts are correctly aligned, the pump should turn freely by hand.
On initial start-up, it is suggested that the driver be “jogged” quickly before continuous operation to be sure the
system and pump and motor are functioning properly and rotating in the intended direction.
3
FLUID
Use only hydraulic fluid recommended for use with the pump. Supplementary oil additives are not recom-
mended. Regular checks should be made of the condition of the hydraulic fluid and the fluid level in the
reservoir, and establishing when the fluid is to be changed. When adding or replacing fluid, use enough fluid
to return the fluid level in the tank to its normal operating point. Be sure the fluid temperature is controlled so
that the minimum allowable viscosity at maximum operating conditions is not exceeded and that the maximum
viscosity at cold start does not cause the suction lift limits to be exceeded.
CAUTION
When replacing
or
adding
fluid, be
careful
to
keep foreign material
from
entering
the fluid and system.
Check the fluid level in the tank before and after start-up to be sure it is within operating limits. If the fluid is
low, or drops as the system fills on start-up, add sufficient clean hydraulic fluid to the tank to bring the fluid to
its normal operating level.
VALVES
Before starting, check all valves to be sure they are in proper position and that there is no possibility of starting
the pump with a blocked suction or discharge line and that the pump is filled with oil.
Using a bleed point at the high point in the system, vent air from the system on start-up.
The relief valve should be about 5% above maximum system operating pressures. Do NOT set the relief valve
higher than the maximum pressure rating of the pump.
MAINTENANCE
GENERAL
If the installation and alignment instructions have been carefully followed, the pump should operate satisfacto-
rily with very little attention. Field maintenance is generally limited to the periodic maintenance checks and the
replacement of seals, gaskets and bearings. Major repair of elevator pumps in most cases is not economical.
IDP Description IDP Description
1 Case 16
K
ey
2 Rotor Housing 17 Bearing Retainer Plate
3 Pipe Plug 18 Retainer Bolt (4)
4 Tube 19 Idler Rotor (2)
5 Tube O Ring (2) 20 Idler Balance Piston Housing (2)
6 Housing O Ring 21 Thrust Plate
7 Cover O Ring 22 Spacer (2)
8 Gas
k
et 23 Hex Bolt (2)
9 Inboard Cover (all except 350 size) 24 Lockwasher (2)
10 Cover Bolt (8) up to 250 size
(16) above 250 size
25 Mechanical Seal
26 Inlet Head
11
P
owe
r
Roto
r
27 Space
r
Ring
13 Retaining Ring (2) 35 Seal Retaining Ring (250 size only)
14 Bearing Space
r
47 Balance Piston Housing (350 size only)
15 Bearing
All quantities are one except when noted in parentheses
Table 1 – List of Material
PART NO. ROTOR SIZE
187 218 250 275 312 350
10 (inboard end) 35 ± 5 50 ± 5 70 ± 5 54 ± 5 78 ± 5 100 ± 5
10 (suction end) 90 ± 5 140 ± 5 145 ± 5 54 ± 5 78 ± 5 100 ± 5
18 18 ± 2 20 ± 2 20 ± 2 16 ± 5 38 ± 2 38 ± 2
23 10 ± 2 15 ± 2 15 ± 2 26 ± 2 30 ± 2 55 ± 5
Table 2 – Bolt Torque Values (LB-FT)
4
WARNING
When inspecting/servicing the shaft seal and/or bearing, the power rotor with these
components installed can be removed as a subassembly. If for any reason the pump is
disassembled further than this, it is possible the idler rotor balance piston housings
(20) may fall off. The idler rotor balance piston housings MUST be properly in place at
reassembly. If idler rotor balance piston housings are not properly installed on the idler
rotors, the pump WILL experience catastrophic failure.
Assembly Drawing
DISASSEMBLY OF BEARING AND MECHANICAL SHAFT SEAL
1. Remove the power rotor assembly.
Power rotor assembly consists of power rotor, bearing, bearing spacer, retaining rings and mechanical seal.
a. Remove coupling or sheave.
b. Remove hex bolts (18).
c. Remove bearing retainer (17).
d. Pull power rotor assembly out of pump case.
2. Remove the outer retaining ring from the power rotor with a screwdriver(13).
3. Remove the inner retaining ring from its groove by pulling back
the mechanical seal and prying with a screwdriver (13).
4. Press the bearing, spacer and stationary seat off the power rotor
(Figure 1).
5. Remove seal subassembly (Figure 3) and gasket from under the
stationary seat.
6. Inspect the shaft. If the shaft is pitted or badly scratched or the
retaining ring grooves damaged, replace the power rotor.
7. Discard the old seal, bearing and retaining rings.
Figure 1
5
REASSEMBLY OF BEARING AND MECHANICAL SHAFT SEAL
1. Clean the power rotor shaft and snap ring grooves prior to installing the new seal and bearing. Wash the
shaft in solvent to remove dirt and grease. Use only new bearing, seal and retaining rings.
2. Place the spring holder and spring on the shaft. Make sure that retaining ring (35) furnished on rotor size
250 and seal spacer (38) for rotor size 275 and 350 is installed on power rotor. Place the spring holder and
spring on rotor shaft.
3. Lubricate the shaft with clean hydraulic fluid.
4. Grasp the seal subassembly, using a rotating motion, gently slide the seal subassembly over the shaft.
Use care not to cut the flexible diaphragm and drive ring. A piece of shim stock wrapped around the power
rotor shaft to cover the snap ring grooves and shoulder of the seal diameter may be used for this purpose.
If shim stock is used, twist the seal subassembly in the same direction as the wrap of the shim stock when
installing it.
5. Insert seal gasket furnished with new mechanical seal into the bore of inboard end cover (46). Clean and
lubricate the face of the carbon ring in the mechanical seal and place the stationary seat and bearing
spacer on the power rotor.
6. Install inner retaining ring.
7. Place the ball bearing on the shaft. Using a hollow tube and pressing on the inner race, set the bearing
firmly against the inner retaining ring (Figure 2). Do not press the bearing on the outer race!
8. Check the mechanical seal. Referring to (Figure 3), the flexible diaphragm must show evenly above the
drive ring, and the drive lugs on the retainer must engage the drive ring to their full length. Adjust the
mechanical seal if necessary.
9. Install the outer retaining ring (13).
10. With a clockwise rotating motion insert power rotor assembly into pump.
11. Install bearing retainer (17).
12. Install hex bolts (18) and torque per Table 2.
Figure 3 – Mechanical Seal Assembly
Figure 2
CIRCOR
1710 Airport Road
PO Box 5020
Monroe, NC USA
28111.5020
Tel: +1. 877.853.7867
Email: cc@circor.com
Web: www.circorpt.com
© 2020 CIRCOR Pumps North America, LLC. All rights reserved.
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1
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