PN97999-751
NM2328A-XPAGE 2 OF 2

PUMP OPTION DESCRIPTION CHART

NM2328A - 1 1 - X 1 1
CONTAINERSUITABILITY
PLUNGER TYPE
SPRING ARRANGEMENT
CONTAINERSUITABILITY
1UNIVERSAL(STUB)
SPRINGARRANGEMENT
1COIL
PLUNGERTYPE
1440SERIES STAINLESS STEEL
PACKINGMATERIAL
PACKINGMATERIAL
3GLASSFILLED PTFE (UPPER AND LOWER)
GUHMW-PE/ LEATHER STAG’D (UPPER AND LOWER)
SUHMW-PE/ GLASS FILLED PTFE STAG’D (UPPER
ANDLOWER)

GENERAL DESCRIPTION

WARNING HAZARDOUSPRESSURE. Do not exceed maxi -
mum operating pressure of 4200 p.s.i. (289.7 bar) at 150 p.s.i.
(10.3 bar) inlet air pressure.
PUMP RATIOX MAXIMUM PUMP
INLET PRESSURE TOPUMP MOTOR =FLUID PRESSURE
Pumpratio is an expression of the relationship between the pump motor area and the
lowerpump end area. EXAMPLE: When 150 p.s.i. (10.3 bar) inlet pressure is supplied
tothemotor of a 28:1 ratio pump it will develop a maximum of 4200 p.s.i. (289.7 bar) fluid
pressure(at no flow) -- as the fluid control isopened, the flow rate will increase as the
motorcycle rate increases to keep up with the demand.
WARNING Referto general information sheet for additional
safety precautions and important information.
Thetwo-ball design provides for easy priming of the lower foot valve.
The double acting feature is standard in all ARO industrial pumps.
Materialis delivered to the pump discharge outlet on both the up and
down stroke.
The motor is connected to the lower pump end with a spacer tube
and solvent cup. This allows for lubrication of the upper packing
gland and to prevent air motor contamination because of normal
wear and eventual leakage through the material packing gland.

TROUBLE SHOOTING

Pump problems can occur in either the Air Motor Section or the Lower
PumpEnd Section. Use these basic guidelines to help determine which
section is affected. Be sure to eliminate any possible non-pump prob-
lems before suspecting pump malfunction.
Pump will not cycle.
No pressure to the motor.See motor manual.
Restricted return lines. Clean obstruction.
Damaged motor.Service motor
No material at the outlet (pump continually cycles).
Checkthe material supply, disconnect or shut off the air supply and
replenish the material, reconnect.
Material on one stroke only (fast downstroke).
The lower check may not be seating in the foot valve (see lower
pump disassembly). Remove the check from the foot valve, clean
andinspect the valve seat area. If check or foot valve are damaged,
replace.
Material on one stroke only (fast upstroke).
The middle packings may be worn (see lower pump disassembly).
Replace the seals as necessary.
Materialleakage out of the solvent cup or material appears o n the
pump plunger rod.
Tightenthe solvent cup until leakage discontinues. If this procedure
does not aid in stopping the leakage problem, the upper packings
maybe worn ( see lower pump disassembly). Replace the seals as
necessary.

PUMP CONNECTION -- UPPER / LOWER

NOTE: All threads are right hand.
1. Loosen(90027) lock nut and unscrew entirepump from t he air mo-
tor.This will expose (94786) connecting pin (see figure 2).
2. Remove (Y15-21-S) cotter pin and (94786) connecting pin to re-
lease plunger from piston rod.
Lower Pump
Plunger
Pump Motor
Piston Rod
Cotter Pin
(Y15-21-S)Ref.
PUMP CONNECTOR DETAIL
FIGURE 2
Connecting Pin
(94786) Ref.
Lock Nut
(90027) Ref.
REASSEMBLY
1. Assemble(90267) plunger to air motor rod, aligning through holes.
2. Assemble (94786) connecting pin through hole, securing plunger.
3. Assemble (Y15-21-S) cotter pin through connecting pin.
4. Screw the lower pump assembly to the air motor.
5. Screw (90027) lock nut against air motor base and tighten.