IMO *G3D-187, Instruction Manual

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A. GENERAL INSTRUCTIONS
The instructions found herein cover the disassembly, assembly and parts identification of
_G3D-187, 218, 250 and 312 series pumps. Both the original design with idler cups and the newer
design with hydrostatic idlers are covered.
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 Operation, Maintenance, and Troubleshooting Manual, (No. SRM00046), provided
with your order. For further detailed information and technical assistance please refer to Imo
Pump, Technical/Customer Service Department, at (704) 289-6511.
This manual cannot possibly cover every situation connected with the 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 the 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
This instruction manual covers series _G3D-187, 218, 250 and 312 Imo pumps. This series of pumps has
been designed for use in hydraulic, lubricating, seal, distillate, residual, fuel and crude 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
_G3D-187, 218, 250 and Series pumps are positive displacement, rotary screw pumps consisting of a
precision bored housing which 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.
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