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GENERAL INSTRUCTIONS
These instructions cover disassembly, assembly and parts identification of AA3G-187 thru 250 Series,
Imo Pumps.
NOTE: Individual contracts may have specific provisions that vary from manual. For further detailed
information and technical assistance to questions not answered by these manuals, please refer to Imo
Pump, Technical/Customer Service Department, at (704) 289-6511.
This manual cannot cover every situation connected with 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 experience to apply sound safety and operational practices that may not be otherwise covered
by this manual.
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.
INTRODUCTION
This manual covers series AA3G-187 through 250 Imo Pumps. This pump series has been designed for
general use in lubricating, seal and distillate fuel oil applications. Size and construction of each pump is
identified in model number on pump nameplate. Definitions of model designators are identified below.
AA 3G / N V P K F B 187SP 000
Design Version
Special Pump Designator
Pump Series
Size / Lead / Rotation
Separator
187SY
=
1.45D
CW
250AL
=
1.3D
CW
187SZ = 1.45D CCW
250AM = 1.3D CCW
Hardened Screw Set N
= No
187SM = 1.75D CW
250SP = 1.6D CW
187SN = 1.75D CCW
250SR = 1.6D CCW
Seals
187SC = 2.0D CW
250SC = 2.0 CW
V
= Fluorocarbon (Viton) Elastomer Bellows Mech.
187SD = 2.0D CCW
250SD = 2.0D CCW
Seal, carbon on Ni-Resist, Viton, 0-Ring Seat
200SC = 2.0D CW
H
= Metal Bellows, Balanced Mech. Seal,
200SD = 2.0D CCW
Carbon on silicon carbide. Viton, O-ring seat
J
= Metal Bellows, Balanced Mechanical Seal,
Relief Valve Set Range (
Not available on steel version.)
Carbon on silicon carbide, Neoprene, O-ring seat
N
= No Seal, Fluorocarbon (Viton) O-rings
A
= No Relief Valve
B
= 60 or 75 psig Differential
Case Materials
C
= 90, 105,120 psig Differential
P
= Iron with SAE 4-Bolt Pad Discharge Port
D
= 135, 150,165 psig Differential
S
= Steel with SAE 4-Bolt Pad Discharge Port
E
= 175, 190, 210, 225, 240 psig diff.
Inlet Type
Mounting
K
= Axial with SAE 4-Bolt Pad (Seal-less pump only)
C
=
SAE 4 bolt flange mount
M
= Radial with SAE 4-Bolt Pad (Seal-less pump only)
F
= Foot Mounted
P
= Axial with SAE 4-Bolt Pad and Weep Hole
I
= Integral Flange Mount (Used With No Seal)
S
= Radial with SAE 4-Bolt Pad and Weep Hole
