OPERATOR’S MANUAL 66243--X
RELEASED: 7--7--90
REVISED: 6--4--10
(REV.F) IPP
INCLUDING: SERVICE KIT, TROUBLESHOOTING, PARTS LIST,
DISASSEMBLY AND ASSEMBLY

IMPORTANT: READ THIS MANUAL CAREFULLY BEFORE INSTALLING,

OPERATING OR SERVICING THIS EQUIPMENT.

CHOP--CHECK STYLE

LOWER PUMP END

ALSO COVERS 637071-XXX SERVICE KIT
1COIL SPRING. -
4WAVE SPRING
5COMPOSITE SPRING W/ADJ P’KG NUT -
-ASOF MAY 15, 1995 NO LONGER AVAILABLE
DUHMW--PE/LEATHERSTAG’D(UPPER)
LEATHER(LOWER) -
5PTFE(GF)/LEATHERSTAG’D (UPPER)
GLASSFILLED PTFE (LOWER) -
1THIOKOL LEATHER -
PUHMW--PE/PTFESTAG’D (UPPER)
UHMW--PE(LOWER)
RPTFE/UHMW--PESTAG’D (UPPER)
PTFE(LOWER)
(PACKINGSARE UPPER AND LOWER UNLESS NOTED)

LOWER PUMP END OPTION

DESCRIPTION CHART*

66243--XXX

PACKINGMATERIAL
3GLASS FILLED PTFE PACKINGMATERIAL
_____
PLUNGER TYPE
SPRING ARRANGEMENT
SPRINGARRANGEMENT PLUNGERTYPE
3HD SS W/HD CHROME PLATING
*NOT ALL MODEL COMBINATIONS ARE AVAILABLE,REFER TO PUMP MODEL MANUAL (650XXX--XXX) FOR ‘‘ACTIVE” MODELS.
CUHMW --PE
GUHMW --PE/LEATHERSTAG’D
7THREADED PLUNGER (LG MOTORS)

SERVICE KITS

Use only genuine ARO replacement parts to assure compatible-
pressure rating and longest service life.
637071--XXXfor general repair of 66243--XXX Lower Pump End.

GENERAL DESCRIPTION

LOWER PUMP END
WARNING DONOT EXCEED MAXIMUM OPERATINGPRES -
SURE AS INDICATEDON PUMP MODEL PLATE
WARNING REFER TO GENERAL INFORMATION SHEET
FORADDITIONAL SAFETY PRECAUTlONS AND IMPORTANT
INFORMATION.(See the pump model manual for the proper Form
No.)
ThisLOWER PUMP END MANUAL is one of four documents need-
edto properly support an ARO pump model. Ref: Part A. 650XXX--
XXX--X MODEL (OPERATOR’S) MANUAL, Part B. GENERAL
INFORMATION,Part C. MOTOR (OPERATOR’S) MANUAL, Part
D. LOWER PUMP END (OPERATOR’S)MANUAL. These forms
are available from the factory if needed.
TheChop--Checkdesign provides far easy priming of the lower foot
valve. The double acting feature is standard in all ARO industrial
pumps, material is delivered to the pump discharge outlet on both
the up and down stroke.
PUMP RATI0 X REGULATED = MAXIMUM FLUID PRESSURE
PRESSURE
Thepump ratio is an expression of the relationship between the air
motor area and the lower pump end area. EXAMPLE: When 150
PSI(10.3 Bar) air pressure is supplied to the pump motor on a 3:1
ratiopump, the lower pump end will develop a maximum of 450 PSI
(31Bar) fluid pressure (at no flow). As the fluid control is opened, the
flowrate will increase as the motor cycle rate increases to keep up
with the demand.
Operatingat excessive pressures will shorten the life of the pump.

TROUBLE SHOOTING CHOP- CHECK PUMPS

Lower Pump End Problems
No material at outlet. (Pump continually cycles.)
Checkmaterial supply, disconnect or shut off the air supply and re-
plenish 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.)
Checkfor worn or damaged seals. Replace the seals as necessary.
Material leakage out of the solventcup or material appears on the
pump plunger rod.
ForModels (--X5XOnly). Increase the load on the packings by tight-
ening the packing nut.
Check for worn upper packings and replace them as necessary.
INGERSOLL RAND COMPANY LTD
209 NORTH MAIN STREET – BRYAN, OHIO 43506
(800) 495-0276 FAX(800) 892-6276 © 2010
www.ingersollrandproducts.com