PN97999-581
650409-XPage2of2
PUMP OPTION DESCRIPTION CHART
650409 - X DESCRIPTION
PTFEPacking / Plain Rod & Tube, Standard Motor
1 UHMW-PEPacking / Plain Rod & Tube, Counter Motor
4 UHMW-PEPacking / Plain Rod & Tube, Standard Motor
DESCRIPTION
GENERAL DESCRIPTION
WARNIN G HAZARDOUSPRESSURE. Do not exceed maxi -
mumoperatingpressure of 1,350 p.s.i. (93 bar) at 150 p.s.i. (10.3
bar)inlet air pressure.
PUMPRATIO X MAXIMUMPUMP
INLETPRESSURE TO PUMP MOTOR =FLUIDPRESSURE
Pumpratio is an expression of the relationship between the pump motorarea and the
lowerpump end area. EXAMPLE: When 150 p.s.i. (10.3 bar) inlet pressure is supplied
tothe motor of a 9:1 ratio pump it will develop amaximum of 1,350 p.s.i. (93 bar) fluid
pressure(at no flow) - as the fluid control is opened, the flowrate will increase as the
motorcycle rate increases to keep up with the demand.
WARNIN G Referto general information sheet for additional
safetyprecautions and important information.
•Thetwo-balldesign provides for easypriming of thelower foot valve.
Thedouble acting feature is standard in all ARO industrial pumps.
Materialis delivered to the pump discharge outlet on both the upand
downstroke.
•Themotor 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
wearand 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
sectionis affected. Be sure to eliminate any possible non-pump prob-
lemsbefore suspecting pump malfunction.
Pumpwill not cycle.
•Nopressure to the motor. See motor manual.
•Restrictedreturn lines. Clean obstruction.
•Damagedmotor. Service motor
Nomaterial at the outlet (pump continually cycles).
•Checkthe material supply, disconnect or shut off the air supply and
replenishthe material, reconnect.
Materialon one stroke only (fast downstroke).
•The lower check may not be seating in the foot valve (see lower
pumpdisassembly). Remove the check from t he foot valve, clean
andinspect the valve seat area. If check or foot valve are damaged,
replace.
Materialon one stroke only (fast upstroke).
•Themiddle packings may be worn (see lower pump disassembly).
Replacethe seals as necessary.
Materialleakage out of the solvent cup or material appears on the
pumpplunger rod.
•Tightenthe solvent cup until leakage discontinues. If this procedure
doesnot 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(90606) lock nut and unscrew entire pump from t he air mo-
tor.This will expose (90609) retaining screw (see figure 2).
2. Unscrew (90609) retaining screw to remove pump assembly from
theair motor.
3. Remove (90608) shoulder nut to remove (90609) retaining screw.
LowerPump
Plunger
PumpMotor
PistonRod
PUMPCONNECTOR DETAIL
Figure2
ShoulderNut
90608
LockNut
(90606)Ref.
RetainingScrew
90609
REASSEMBLY
1. Slide (90609) retaining screw over air motor rod (see figure 2).
2. Screw (90608) shoulder nut to air motor rod.
3. Apply Loctite 242 to threads of (90609) retaining screw and screw
(90609)retaining screw into lower pump plunger.
4. Screw the lower pump assembly to the air motor.
5. Positionair motor exhaust port approximately 90_from lower pump
outlet.
6. Screw(90606) lock nut against air motor base and tighten to 50 - 65
ftlbs (67.8 - 88.1 Nm).