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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.
