ARO 66610X-X-C Series User manual

OPERATOR’S MANUAL 66610X-X-C
INCLUDING: OPERATION, INSTALLATION AND MAINTENANCE RELEASED: 8-24-89
REVISED: 12-12-17
(REV: AJ)
1” DIAPHRAGM PUMP
1:1 RATIO (METALLIC)
READ THIS MANUAL CAREFULLY BEFORE INSTALLING,
OPERATING OR SERVICING THIS EQUIPMENT.
It is the responsibility of the employer to place this information in the hands of the operator. Keep for future reference.
INGERSOLL RAND COMPANY LTD
209 NORTH MAIN STREET - BRYAN, OHIO 43506
[phone] FAX [phone] © 2017 CCN 81376642
arozone.com
SERVICE KITS
Refer to the Model Description Chart to match the pump material
options.
637118-C for air section repair (see page 6).
637119-XXX-C for uid section repair with seats (see page 4).
637119-XX-C for uid section repair without seats (see page 4).
637167 Abrasion Resistant Conversion Kit is available for use in heavy
and abrasive material applications (see page 4).
PUMP DATA
Models . . . . . . . . . . . . see “Model Description Chart” for“-XXX”
Pump Type . . . . . . . . . Metallic Air Operated Double Diaphragm
Material . . . . . . . . . . . . see“Model Description Chart”
Weight . . . . Aluminum . . . . . . . . . . . 19 lbs (8.62 kgs)
Cast Iron . . . . . . . . . . . . 31 lbs (14.06 kgs)
Stainless Steel . . . . . . . . 36 lbs (16.33 kgs)
[add 8 lbs (3.63 kgs) for cast iron air motor section]
Maximum Air Inlet Pressure . . . . . . . . . 120 psig (8.3 bar)
Maximum Material Inlet Pressure . . . . 10 psig (0.69 bar)
Maximum Outlet Pressure . . . . . . . . . . 120 psig (8.3 bar)
Maximum Flow Rate (ooded inlet) . . 35 gpm (133 lpm)
Displacement / Cycle @ 100 psig
Standard Diaphragm....................0.16 gal. (0.60 lit.)
Composite PTFE Diaphragm......0.14 gal. (0.525 lit.)
Maximum Particle Size . . . . . . . . . . . 1/8” dia. (3.2 mm)
Maximum Temperature Limits (diaphragm / ball / seat material)
Acetal . . . . . . . . . . . . . . . . . 10⁰ to 180⁰ F (-12⁰ to 82⁰ C)
E.P.R. / EPDM . . . . . . . . . . .-60⁰ to 280⁰ F (-51⁰ to 138⁰ C)
Hytrel® . . . . . . . . . . . . . . . . -20⁰ to 180⁰ F (-29⁰ to 82⁰ C)
Neoprene . . . . . . . . . . . . . 0⁰ to 200⁰ F (-18⁰ to 93⁰ C)
Nitrile . . . . . . . . . . . . . . . . . 10⁰ to 180⁰ F (-12⁰ to 82⁰ C)
Polypropylene . . . . . . . . 35⁰ to 175⁰ F (2⁰ to 79⁰ C)
Polyurethane . . . . . . . . . . 10⁰ to 150⁰ F (-12⁰ to 66⁰ C)
Kynar® PVDF . . . . . . . . . . . 10⁰ to 200⁰ F (-12⁰ to 93⁰ C)
Santoprene®. . . . . . . . . . . -40 to 225 F (-40 to 107⁰ C)
PTFE . . . . . . . . . . .. . . . . . . . 40⁰ to 225⁰ F (4⁰ to 107⁰ C)
Viton® . . . . . . . . . . . . . . . . . -40⁰ to 350⁰ F (-40⁰ to 177⁰ C)
Dimensional Data . . . . . . . . . . . . . . . see page 8
Noise Level @ 70 psig, 60 cpm . . 64.5dB(A)*
* The pump sound pressure levels published here have been updated to an Equivalent Contin-
uous Sound Level (LA
eq
) to meet the intent of ANSI S1.13-1971, CAGI-PNEUROP S5.1 using four
microphone locations.
NOTICE: All possible options are shown in the chart. However, certain combina-
tions may not be recommended, consult a representative or the factory if you
have questions concerning availability.
MODEL DESCRIPTION CHART
6661X X X XX C
6661XX XXX C
C
637119 XX
DIAPHRAGMBALL
FLUID SECTION SERVICE KIT SELECTION
EXAMPLE:MODEL # 666100-361-C
Fluid Section Service Kit # 637119-61-C
CENTER BODY MATERIAL
FLUID CAP / MANIFOLD MATERIAL
0 - Aluminum, NPTF 2 - Aluminum, BSP
1 - Cast Iron, NPTF 3 - Cast Iron, BSP
Seat Material
1 - Aluminum 4 - Kynar PVDF
2 - 316 Stainless Steel 5 - Carbon Steel
3 - Polypropylene
Ball Material
8 - Hard 440 Stainless Steel
0 - Aluminum, Single A - Aluminum, Single
(Steel Hardware) (Stainless Steel Hardware)
1 - Stainless Steel, Single B - Stainless Steel, Single
2 - CastIron, Single C - Cast Iron, Single
9 - Stainless Steel, Dual D - Stainless Steel, Dual
1 - Neoprene
6 - Acetal
2 - Nitrile 8 - Polyurethane
3 - Viton A - Stainless Steel
4 - PTFE C - Hytrel E - Santoprene
DiaphragmMaterial
1 - Neoprene
2 - Nitrile
4 - PTFE / Santoprene
3 - Viton
6 - Composite PTFE
9 - Hytrel
B - Santoprene
6661XX-XXX-C
1’’ DIAPHRAGM PUMP
DUAL MANIFOLD
SINGLEMANIFOLD
Figure 1

Page 2 of 8 66610X-X-C (en)
EXCESSIVE AIR PRESSURE
STATIC SPARK
HAZARDOUS MATERIALS
HAZARDOUS PRESSURE
WARNING
EXCESSIVE AIR PRESSURE. Can cause
personal injury, pump damage or property damage.
yDo not exceed the maximum inlet air pressure as stated
on the pump model plate.
yBe sure material hoses and other components are able
to withstand fluid pressures developed by this pump.
Check all hoses for damage or wear. Be certain dispens-
ing device is clean and in proper working condition.
WARNING
STATIC SPARK. Can cause explosion
resulting in severe injury or death. Ground pump and
pumping system.
ySparks can ignite ammable material and vapors.
yThe pumping system and object being sprayed must
be grounded when it is pumping, ushing, recirculat-
ing or spraying flammable materials such as paints,
solvents, lacquers, etc. or used in a location where
surrounding atmosphere is conducive to spontaneous
combustion. Ground the dispensing valve or device,
containers, hoses and any object to which material is
being pumped.
yUse the pump grounding screw terminal provided.
Use ARO part no. 66885-1 ground kit or connect a
suitable ground wire (12 ga. minimum) to a good
earth ground source.
ySecure pump, connections and all contact points to
avoid vibration and generation of contact or static spark.
yConsult local building codes and electrical codes for
specic grounding requirements.
yAfter grounding, periodically verify continuity of elec-
trical path to ground. Test with an ohmmeter from
each component (e.g., hoses, pump, clamps, contain-
er, spray gun, etc.) to ground to ensure continuity.
Ohmmeter should show 0.1 ohms or less.
ySubmerse the outlet hose end, dispensing valve or
device in the material being dispensed if possible.
(Avoid free streaming of material being dispensed.)
yUse hoses incorporating a static wire.
yUse proper ventilation.
yKeep inammables away from heat, open ames and
sparks.
yKeep containers closed when not in use
y
WARNING
Pump exhaust may contain contam-
inants. Can cause severe injury. Pipe exhaust away
from work are and personnel.
yIn the event of a diaphragm rupture, material can be
forced out of the air exhaust muer.
yPipe the exhaust to a safe remote location when
pumping hazardous or inammable materials.
yUse a grounded 3/8” minimum i.d. hose between the
pump and the muer.
WARNING
HAZARDOUS PRESSURE. Can result in
serious injury or property damage. Do not service
or clean pump, hoses or dispensing valve while the
system is pressurized.
yDisconnect air supply line and relieve pressure from
the system by opening dispensing valve or device and
/ or carefully and slowly loosening and removing out-
let hose or piping from pump.
WARNING
HAZARDOUS MATERIALS. Can cause
serious injury or property damage. Do not attempt
to return a pump to the factory or service center that
contains hazardous material. Safe handling practices
must comply with local and national laws and safety
code requirements.
yObtain Material Safety Data Sheets on all materials
from the supplier for proper handling instructions.
y
WARNING
EXPLOSION HAZARD. Models con-
taining aluminum wetted parts cannot be used with
1,1,1-trichloroethane, methylene chloride or other
halogenated hydrocarbon solvents which may react
and explode.
yCheck pump motor section, uid caps, manifolds and
all wetted parts to assure compatibility before using
with solvents of this type.
CAUTION
Verify the chemical compatibility of the
pump wetted parts and the substance being pumped,
flushed or recirculated. Chemical compatibility may
change with temperature and concentration of the
chemical(s) within the substances being pumped,
ushed or circulated. For specic uid compatibility,
consult the chemical manufacturer.
CAUTION
Maximum temperatures are based
on mechanical stress only. Certain chemicals will
significantly reduce maximum safe operating
temperature. Consult the chemical manufacturer for
chemical compatibility and temperature limits. Refer
to PUMP DATA on page 1 of this manual.
CAUTION
Be certain all operators of this equipment
have been trained for safe working practices,
understand it’s limitations, and wear safety goggles /
equipment when required.
CAUTION
Do not use the pump for the structural
support of the piping system. Be certain the system
components are properly supported to prevent stress
on the pump parts.
ySuction and discharge connections should be exible
connections (such as hose), not rigid piped, and should
be compatible with the substance being pumped.
CAUTION
Prevent unnecessary damage to the
pump. Do not allow pump to operate when out of
material for long periods of time.
yDisconnect air line from pump when system sits idle
for long periods of time.
CAUTION
Use only genuine ARO replacement parts to
assure compatible pressure rating and longest service life.
NOTICE
Replacement warning labels are
available upon request: “Static Spark” (93616-1) and
“Diaphragm Rupture” (93122).
WARNING
= Hazards or unsafe practices which
could result in severe personal injury,
death or substantial property damage.
CAUTION
=Hazards or unsafe practices which
could result in minor personal inju-
ry, product or property damage.
NOTICE
=Important installation, operation or
maintenance information.
OPERATING AND SAFETY PRECAUTIONS
READ, UNDERSTAND, AND FOLLOW THIS INFORMATION TO AVOID INJURY AND PROPERTY DAMAGE.

66610X-X-C (en) Page 3 of 8
GENERAL DESCRIPTION
The ARO diaphragm pump oers high volume delivery even
at low air pressure and a broad range of material compati-
bility options available. Refer to the model and option chart.
ARO pumps feature stall resistant design, modular air motor /
uid sections. Air operated double diaphragm pumps utilize
a pressure dierential in the air chambers to alternately cre-
ate suction and positive uid pressure in the uid chambers,
valve checks ensure a positive ow of uid. Pump cycling will
begin as air pressure is applied and it will continue to pump
and keep up with the demand. It will build and maintain line
pressure and will stop cycling once maximum line pressure is
reached (dispensing device closed) and will resume pumping
as needed.
AIR AND LUBE REQUIREMENTS
WARNING
EXCESSIVE AIR PRESSURE. Can cause
personal injury, pump damage or property damage.
yA filter capable of filtering out particles larger than 50 mi-
crons should be used on the air supply. There is no lubrication
required other than the “O” ring lubricant which is applied
during assembly or repair.
yIf lubricated air is present, make sure that it is compatible
with the “O” rings and seals in the air motor section of the
pump.
OPERATING INSTRUCTIONS
yAlways flush the pump with a solvent compatible with
the material being pumped if the material being pumped
is subject to “setting up” when not in use for a period of
time.
yDisconnect the air supply from the pump if it is to be in-
active for a few hours.
yThe outlet material volume is governed not only by the
air supply, but also by the material supply available at the
inlet. The material supply tubing should not be too small
or restrictive. Be sure not to use hose which might co
lapse.
yWhen the diaphragm pump is used in a forced-feed
(ooded inlet) situation, it is recommended that a “Check
Valve”be installed at the air inlet.
ySecure the diaphragm pump legs to a suitable surface to
ensure against damage by vibration.
MAINTENANCE
Refer to the part views and descriptions as provided on pages
4 through 7 for parts identication and service kit information.
yCertain ARO “Smart Parts” are indicated which should be
available for fast repair and reduction of down time.
yService kits are divided to service two separate dia-
phragm pump functions: 1. AIR SECTION, 2. FLUID SEC-
TION. The FLUID SECTION is divided further to match
typical part MATERIAL OPTIONS.
yProvide a clean work surface to protect sensitive internal
moving parts from contamination from dirt and foreign
matter during service disassembly and reassembly.
yKeep good records of service activity and include pump
in preventive maintenance program.
yBefore disassembling, empty captured material in the
outlet manifold by turning the pump upside down to
drain material from the pump.
FLUID SECTION DISASSEMBLY
1. Remove top manifold(s).
2. Remove (22) balls, (19)“O”rings and (21) seats.
3. Remove (15) uid caps.
NOTE: Only PTFE diaphragm models use a primary dia-
phragm (7) and a backup diaphragm (8). Refer to the auxilia-
ry view in the Fluid Section
Illustration.
For 6661XX-XX6-C:
4. Remove (7) diaphragm, (5) washers and (30) shims.
For other models:
4. Remove the (14) screws, (6) washers, (7) or (7 / 8) dia-
phragms and (5) washers.
5. Remove (3)“O”rings.
Viton®and Hytrel®are registered trademarks of the DuPont®Company. Kynar®is a registered trademark of Penwell Corp
Santoprene®is a registered trademark of Monsanto Company, licensed to Advanced Elastomer Systems, L.P. Key-Lube®is a registered trademark of Key Industries
FLUID SECTION REASSEMBLY
yReassemble in reverse order.
yClean and inspect all parts. Replace worn or damaged
parts with new parts as required.
yLubricate (1) diaphragm rod and (2) “O” ring with Key-
Lube“O” ring lube.
yUse ARO pn / 98931-T bullet (installation tool) to aid in
installation of (2)“O”ring on (1) diaphragm rod.
For 6661XX-XX6-C:
yAttach a regulated airline to the pump inlet; gradually
increasing the air pressure (6-8 psi) to check which side of
the pump with air blowing out, and then shut down the
air supplier.
yFasten (7) diaphragm with (5) washer into (1) diaphragm
rod, and insert them into (101) Center body from the
chamber identied with blowing air in the previous step.
yInstall (15) uid cap.
yThread the other side of (7) diaphragm with (5) washer
into (1) diaphragm rod, but do not tighten it.
yRecord the angle for the misalignment between (7) dia-
phragm hole and (101) center body holes, then unthread
the (7) diaphragm and place proper Qty. of (30) shims
between (5) washer and (1) diaphragm rod.
yAttach a regulated airline to the pump inlet, gradually
increasing the air pressure (6-8 psi) until the diaphragm
shift to the other site, shut down the air supply.
yInstall the second (15) uid cap.
NOTE: For details, refer to service kits manual 48495949.
For other models:
yBe certain (7) or (7 / 8) diaphragm(s) align properly with
(15) uid caps before making nal torque adjustments on
bolt and nuts to avoid twisting the diaphragm.
yFor models with PTFE diaphragms: Item (8) Santoprene
diaphragm is installed with the side marked “AIR SIDE” to-
wards the pump center body. Install the PTFE diaphragm
with the side marked “FLUID SIDE”towards the uid cap.
yRe-check torque settings after pump has been re-started
and run a while.

Page 4 of 8 66610X-X-C (en)
PARTS LIST / 66610X-X-C FLUID SECTION
Fluid Section Service Kits (637119-XXX-C OR 637119-XX-C)
For Fluid Kits With Seats:
637119-XXX-C Fluid Section Service Kits include: Seats (see SEAT Option, refer to -XXX in chart below), Balls (see BALL Option, refer to -XXX in chart
below), Diaphragms (see DIAPHRAGM Option, refer to -XXX in chart below), plus “O” ring items (2), (3), (4), (19) and (33) listed below plus 93706-1 Key Lube
grease packet (see page 6).
For Fluid Kits Without Seats:

637119-XX-C Fluid Section Service Kits include: Balls (see BALL Option, refer to -XX in chart below), Diaphragms (see DIAPHRAGM Option, refer to -XX in
chart below), plus“O”ring items (2), (3), (4), (19) and (33) listed below plus 93706-1 Key Lube grease packet (see page 6).
SEAT OPTIONS
6661XX-XXX-C BALL OPTIONS 6661XX-XXX-C

“21”

“22” (1-” dia.) (Service Kit - XX)
-XXX Seat Qty [Mtl] -XXX Ball Qty [Mtl] -XXX Ball Qty [Mtl]
-1XX 92008-1 (4) [A] -X1X 90532-1 (4) [N] -X8X 90532-8 (4) [U]
-2XX 90428-1 (4) [SS] -X2X 90532-2 (4) [B] -XAX 90948 (4) [SS]
-3XX 92926 (4) [P] -X3X 90532-3 (4) [V] -XCX 90532-C (4) [H]
-4XX 92941 (4) [K] -X4X 90532-4 (4) [T] -XEX 90532-A (4) [Sp]
-8XX 93367-1 (4) [SH] -X6X 90532-6 (4) [D]
HARDWARE OPTIONS 6661XX-XXX-C
Carbon Steel
6661X0-, 1-, 2-, 9-
Stainless Steel
6661XA-, B-, C-, D-,
Item Description (size) Qty Part No. [Mtl] Part No. [Mtl]
5 Washer - Air Side (3-5/8" o.d.) (2) 93441-2 (C) 93441-1 [SS]
24 Washer -
(models 66619X9 and 6661XD only (5/16")) (8) Y13-5-C (C) Y13-5-T [SS]
26 Bolt (5/16" -18 x1") (8) Y6-55-C (C) Y6-55-T [SS]
29 Nut (5/16" -18) (16) Y12-5-C (C) Y12-5-S [SS]
DIAPHRAGM OPTIONS 66610X-XXX-C

For Service Kits
With Seats
-XXX = (Seat),
-XXX = (Ball)
-XXX = (Diaphragm)

For Service
Kits Without
Seats
-XX = (Ball),
-XX = (Diaphragm)

“7”

“8”

“3”

“19”
"O” Ring
3/32" x 1-9/16"
o.d.
-XXXDiaphragm [Qty] [Mtl] Diaphragm [Qty] [Mtl]
"O” Ring
1/16" x 5/8" o.d. [Qty] [Mtl] [Qty] [Mtl]
-XX1 637119-XX1-C 637119-X1-C 90533-1 (2) [N] ----- --- --- Y325-14 (4) [B] Y325-126 (4) [B]
-XX2 637119-XX2-C 637119-X2-C 90533-2 (2) [B] ----- --- --- Y325-14 (4) [B] Y325-126 (4) [B]
-XX3 637119-XX3-C 637119-X3-C 90533-3 (2) [V] ----- --- --- Y328-14 (4) [T] Y327-126 (4) [V]
-XX4 637119-XX4-C 637119-X4-C 93459-4 (2) [T] 92973-B (2) [SP] Y328-14 (4) [T] Y328-126 (4) [T]
-XX6 ----- 48495964 48490056 (2) [CP] ----- --- --- ------ ---- --- Y328-126 (4) [T]
-XX9 637119-XX9-C 637119-X9-C 90533-9 (2) [H] ----- --- --- Y328-14 (4) [T] Y327-126 (4) [V]
-XXB 637119-XXB-C 637119-XB-C 90533-B (2) [SP] ----- --- --- Y328-14 (4) [T] 90534 (4) [E]
MANIFOLD / FLUID CAP MATERIAL OPTIONS 6661XX-XXX-C
Aluminum
6661X0-X, 6661XA-X
Stainless Steel
6661X1-, 1X9-, 1XB-, 1XD-
Cast Iron
6661X2-X, 6661XC-X
NPTF BSP NPTF BSP NPTF. BSP
Item Description (Size) Qty Part No. Part No. [Mtl] Part No. Part No. [Mtl] Part No. Part No. [Mtl]
15 Fluid Cap (2) 94945 94945 [A] 91045 91045 [SS] 94277 94277 [CI]
16 Manifold (6661X0,1X1,1X2, 1XA,1XB,1XC) (2) 92001 92001-1 [A] 91044 91044-1 [SS] 94278 94278-1 [CI]
17 Outlet Manifold (6661X9-, 661XD- only) (2) ----- ----- --- 92846 92846-1 [SS] ----- ----- ---
18 Inlet Manifold (6661X9-, 661XD- only) (2) ----- ----- --- 92847 92847-1 [SS] ----- ----- ---
23 Spring (6661X9-, 6661XD- only) (2) ----- ----- --- 22155 22155 [SS] ----- ----- ---
MATERIAL CODE
[A] = Aluminum
[B] = Nitrile
[C] = Carbon Steel
[CI] = Cast Iron
[Co] = Copper
[CP] = Composite PTFE
[D] = Acetal
[E] = E.P.R.
[H] = Hytrel
[K] = P.V.D.F. (Kynar)
[N] = Neoprene
[P] = Polypropylene
[SP]= Santoprene
[SH] = Hard Stainless Steel
[SS] = Stainless Steel
[T] = PTFE
[V] = Viton
637119
ABRASION RESISTANT
CONVERSION KIT INCLUDE
"21" Seat 93367-1 (4)
"22" Ball 90532-8 (4)
Item Description (size in inches) Qty Part No. [Mtl]
1 Rod (6661XX-XX6-C) (1) 48489660 [C]
(other models) (1) 98724-1 [C]

2 ‘‘O” Ring (3/32” x 3/4” o.d.)

(1) Y330-113 [B]
6Washer - Fluid Side
*
(2) 93441-1 [SS]
models 661X0 and 6661X2 only (2) 93441-2 [C]
Item Description (size in inches) Qty Part No. [Mtl]
9 Washer (0.505” i.d.) * (2) 93189-1 [SS]
14 Screw (1/2 " 20 x 1") * (2) Y5-85-T [SS]
30 Shim (6661XX-XX6-C) () 48499362 # [C]
43 Ground Lug (see page 7) (1) 93004 [Co]
COMMON PARTS
 Service Note: Fluid Section Service Kits also include part no. 93131 (5)“O”rings for repair of“-B” (pre - 8/89) models.
Service Note: Part no. 98930-T installation tool is available separately for use with items 1 and 2.
“Smart Parts”, keep these items on hand in addition to the service kits for fast repair and reduction of down time.
*
For 6661XX-XX6-C, on the uid side, washer (6), (9) and screw (14) are not needed.
The quantity is between 0 to 5, shims are not shown in the exploded view. # For service, shim pack 48499222 can be purchased. Refer to service kits manual 48495949 for details.

66610X-X-C (en) Page 5 of 8
PARTS LIST / 66610X-X-C FLUID SECTION
2
5914
15
16
18
19
21
22
24
29
21
22
FOR THE
AIR MOTOR SECTION
SEE PAGES 6 AND 7
26
17
OPTIONAL
1/2-14 N.P.T.
91046
3/4 -14 N.P.T
.
3/4 -14 N.P.T
.
1’’OUTLET
1’’INLET
Air Inlet
Figure 2
19
16
26
21
22
19
6661XD - XXX - C
6661X9 - XXX - C
23
NOTE: Radius edgeof parts (5 and6)isagainst diaphragm.
COLOR CODE
DIAPHRAGM BALL
MATERIAL COLOR COLOR
Acetal N/A Orange
Nitrile Red (--) Red(•)
E.P.R. Blue (--) Blue(•)
Hytrel Cream Cream
Neoprene Green(-- ) Green (• )
Santoprene CreamCream
PTFE WhiteWhite
Urethane N/A Red
VitonYellow (--) Yellow(•)
(--) Stripe (•)Dot
*Seeitem8in inset below.
TORQUE REQUIREMENTS
NOTE: DO NOT OVERTIGHTENFASTENERS
(14)Bolt,25-30 ft lbs (33.9 - 40.7Nm).
(26) Bolts and(29) nuts,120 -140 in. lbs (13.6 -15.8Nm).
LUBRICATION / SEALANTS
Apply Loctite 271 to threads.
Apply Key-Lube to all “O” rings, “U” Cups &matingparts.
Apply anti-seize compound to threads and bolt and nut ange
heads which contact pump case when using stainless steel
fasteners.
26
6 373
24
26
78
View for -X44 (PTFE diaphragm) conguration only.
AIR SIDE
SANTOPRENE
(GREEN when
usedasbacker)
FLUID SIDE
(WHITE)
Air
Side
Fluid
Side
Cross Section View of Diaphragms
1
8
6
42
3
7
5
Torque Sequence
Air
Side
Fluid
Side
PTFE
6661XD - XXX - C
6661X9 - XXX - C
1

Page 6 of 8 66610X-X-C (en)
“Smart Parts”Keep these items on hand in addition to the Service Kits for fast repair and reduction of down time.
PARTS LIST / 66610X-X-C AIR MOTOR SECTION

Parts Y 145-26 (1.156" i.d.) (qty 2) retaining rings and Y325-24 "O" rings (qty 2)
are included in the service Kit for the repair of larger pumps.
Item Description (size) Qty Part No. [Mtl] Item Description (size) Qty Part No. [Mtl]
101 Motor Body (models 66610X, 66612X) (1) 94743 [A]

117 Gasket (1) 92004 [B/Ny]
(models 66611X, 66612X) (1) 94741 [CI] 118 Pilot Rod (1) 93309-1 [C]

102 “O” Ring (1/16” x 1” o.d.) (2) Y325-20 [B]

119 “O” Ring (1/8” x 3/4” o.d.) (4) 93075 [U]
103 Sleeve (1) 94527 [D] 120 Spacer (3) 115959 [Z]

104 Retaining Ring, TruArc (.925” i.d.) (2) Y145-25 [C] 121 Sleeve Bushing (2) 98723-1 [Bz]
105 Screw/Wshr(1/4”-20 x 5/8”) (-XX0, 1, 2, 9) (8) 93860 [C]

122 “O” Ring (3/32” x 9/16” o.d.) (2) 94820 [U]
Cap Screw (1/4”-20 x 5/8”) (-XXA, B, C, D) (8) Y6-42-T [SS]

123 Screw (#8 - 32 x 3/8”) (4) Y154-41 [C]
106 Lockwasher (1/4”) (8) Y14-416-T [SS] 124 Stud (5/16” - 18 x 1-3/4”) (6661X0, 1X1, 1X2, 1X9) (16) 92866 [C]
107 Leg (models 6661X0, 1X1, 1X2, 1X9) (2) 92003 [C] (5/16” - 18 x 1-3/4”) (6661XA, 1XB, 1XC, 1XD) (16) 92866-1 [SS]
(models 6661XA, 1XB, 1XC, 1XD) (2) 92003-1 [SS] 128 Pipe Plug (1/8 - 27 N.P.T x 1/4”) (1) Y227-2-L [C]

108 Gasket (with notch) (1) 92878 [B/Ny] 133 Lockwasher (1/4”) (1) Y14-416-T [SS]
109 Piston (1) 92011 [D] 197 Button Head Screw (1/4”- 20 x 1/4”) (3) 94987 [SS]

110 “U” Cup (3/16” x 1-3/8” o.d.) (1) Y186-51 [B] 198 Button Head Screw (1/4” - 20 x 3/8”) (1) 94987-1 [SS]
111 Spool (models 66610X, 66612X) (1) 92005 [A] 201 Muer (1) 93110 [C]
(models 66611X, 66613X) (1) 93047 [C]

Key-Lube “O” Ring Lubricant (1) 93706-1
112 Washer (1.557” o.d.) (5) 92877 [Z] Pak of 10 Key-Lube 637175

113 “O” Ring (1/8” x 1-1/4” o.d.) (5) Y325-214 [B]

Service Kits include: Y212-101 (2) Screws (#10 - 32 x 1/4”)
used on units manufactured between 8/90 and 4/92 to retain
the pilot bushing.

114 “O” Ring (3/32” x 1-9/16” o.d.) (6) Y325-126 [B]
115 Spacer (4) 92876 [Z]
116 Spacer (1) 92006 [Z]
MAJOR VALVE DISASSEMBLY
1. Remove (107) plate (or leg depending on model), (108
and 117) gaskets.
2. On the side opposite the air inlet, push on the inner di-
ameter (111) spool. This will force the (109) piston out.
Continue pushing the (111) spool and remove. Check for
scratches and gouges.
3. Reach into the air section (exhaust side) and remove (116)
spacer, (115) spacers, (113)“O”rings, (114) “O” rings, (112)
washers, etc. Check for damaged“O” rings.
MAJOR VALVE REASSEMBLY
1. Replace (112) washer, (114) “O” ring and (113) “O” ring
onto (115) spacer and insert etc.
NOTE: Be careful to orient spacer legs away from
blocking internal ports.
2. Lubricate and carefully insert (111) spool.
3. Install (117) gasket and (107).
4. Lubricate and install (110) packing cup and insert (109)
piston into (air inlet side) cavity, the (110) packing cup
lips should point outward.
5. Install (108) gasket and replace (107).
MATERIAL CODE
[A] = Aluminum [CI] = Cast Iron [SS] = Stainless Steel
[B] = Nitrile [D] = Acetal [U] = Polyurethane
[Bz] = Bronze [N] = Neoprene [Z] = Zinc
[C] = Carbon Steel [NY] = Nylon
AIR MOTOR SECTION SERVICE
Service is divided into two parts − 1. Pilot Valve, 2. Major
Valve. GENERAL REASSEMBLY NOTES:
yAir Motor Section Service is continued from Fluid Section
repair.
yInspect and replace old parts with new parts as neces-
sary. Look for deep scratches on metallic surfaces, and
nicks or cuts in“O”rings.
yTake precautions to prevent cutting “O” rings upon instal-
lation.
yLubricate“O”rings with Key-Lube grease.
yDo not over tighten fasteners, refer to torque specifica-
tion block on view.
yRe-torque fasteners following restart.
PILOT VALVE DISASSEMBLY
1. Remove (104) retaining ring.
2. Remove (123) screws and (122)“O”rings.
3. Remove (118) piston rod, (121) sleeve bushing, (119) “O”
rings and (120) spacers from the (101) motor body.
4. Remove (103) sleeve and (102)“O”rings.
PILOT VALVE REASSEMBLY
1. Replace two (102) “O” rings if worn or damaged and rein-
stall (103) sleeve.
2. Install one of the (121) sleeve bushings, (119) “O” rings,
(120) spacers and the remaining (121) bushing.
3. Carefully push (118) pilot rod into bushings etc. and re-
tain on each end with the two (122) “O” rings, retain with
(123) screws.
4. Replace (104) retaining rings.
 Indicates parts included in 637118-C Air Section Service Kit.
SERVICE KIT NOTE: Service Kit 637118-C is a general repair kit for all 1” and larger ARO diaphragm pump air motors. It contains extra“O” Rings and other
parts that may not be needed to service this model.

66610X-X-C (en) Page 7 of 8
PARTS LIST / 66610X-X-C AIR MOTOR SECTION
MAJOR VALVE
See crosssection detail, gure 4.
PILOT VALVE
101
118
111
112
113
114
115116
117
119
103
104
123
121
122
120
107
108
109
110
106
105
IMPORTANT
BE CERTAIN TO ORIENT (115)SPACER LEGS
AWAY FROM BLOCKING INTERNAL PORTS
WHEN REASSEMBLING AIR SECTION.
MAJOR VALVE CROSS SECTION DETAIL
109 110112114113115111 116
Figure 3
Figure 4
124
TORQUE REQUIREMENTS
NOTE: DO NOT OVERTIGHTENFASTENERS.
(105) 40 -50 in. lbs (4.5-5.6Nm).
LUBRICATION/ SEALANTS
ApplyKey-Lubegreasetoall “O” rings, “U” Cups &matingparts.
Apply Loctite 271 to threads.
Apply Loctite 262 to threads.
Apply Loctite 572 to threads.
102
128
104
121
123
107
197
197
106
105
43
133
198
201

Page 8 of 8 66610X-X-C
PN 97999-100
(Dimensions shown are for reference only,theyare displayed in inches andmillimeters(mm).
8”(203 mm)
12-1/2”
(318 mm)
11-9/16”
(294 mm)
8-9/16”
(217.5 mm)
4”(102 mm)
1-1/4”(32 mm)
7-5/16”(186 mm)
AirInlet
1/4 -18 NPTF -1
13/32”Slot(10 mm)
Figure 5
6-1/4”
(159 mm)
6-1/2”
(165 mm)
Outlet
Inlet
1- 11 1/2 NPTF -1 (66610X, 66611X)
Rp 1 (1 - 11 BSP parallel) (66612X, 66613X)
1- 11 1/2 NPTF -1 (66610X, 66611X)
Rp 1 (1 - 11 BSP parallel) (66612X, 66613X)
TROUBLE SHOOTING
Product discharged from exhaust outlet.
yCheck for diaphragm rupture.
yCheck tightness of diaphragm nut.
Air bubbles in product discharge.
yCheck connections of suction plumbing.
yCheck“O”rings between intake manifold and uid caps.
yCheck tightness of diaphragm nut.
Low output volume, erratic ow, or no ow.
yCheck air supply.
yCheck for plugged outlet hose.
yCheck for kinked (restrictive) outlet material hose.
yCheck for kinked (restrictive) or collapsed inlet
material hose.
yCheck for pump cavitation − suction pipe should be sized
at least as large as the inlet thread diameter of the pump
for proper ow if high viscosity uids are being pumped.
Suction hose must be a non-collapsing type, capable of
pulling a high vacuum.
yCheck all joints on the inlet manifolds and suction con-
nections. These must be air tight.
yInspect the pump for solid objects lodged in the dia-
phragm chamber or the seat area.
DIMENSIONAL DATA