OPERATOR’S MANUAL
PD20X-XXX-XXX-B
INCLUDING: OPERATION, INSTALLATION & MAINTENANCE
PE20X-XXX-XXX-B( )
RELEASED:
REVISED:
(REV. 08)
2-2-05
1-13-12
2" 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.
SERVICE KITS
Refer to Model Description Chart to match the pump material op-
tions.
637309-XX for fluid section repair (see page 4). NOTE: This kit also
contains several air motor seals which will need to be replaced.
637374-X major air valve assembly (see page 7).
637421 for air section repair (see page 6).
PUMP DATA
Figure 1
Models. . . . . . . . . . . . . . . . . see Model Description Chart for “-XXX”
Pump Type. . . . . . . . . . . . . Metallic Air Operated Double Diaphragm
Material. . . . . . . . . . . . . . . . see Model Description Chart
Weight . . PX20A-XAX-XXX-B( ) . . . . . . . . . . 91.4 lbs (41.5 kgs)
PX20A-XCX-XXX-B( ) . . . . . . . . . . 147.4 lbs (66.9 kgs)
MODEL DESCRIPTION CHART
P X 20 X - X X X - X X X - B (0L)
PX20A-AHX-XXX-B( ), -BHX . . . 155.0 lbs (70.3 kgs)
Electronic Interface
PX20A-ASX-XXX-B( ), -BSX . . . . 149.8 lbs (68.0 kgs)
D - None
PX20A-FHX-XXX-B( )
. . . . 169.4 lbs (76.8 kgs)
. . . . .
E
-
Available
PX20A-FSX-XXX-B( ) . . . . . . . . . . . .162.0 lbs (73.5 kgs)
(add 28.9 lbs [13.1 kg] for stainless steel air motor section)
Maximum Air Inlet Pressure . . . . . . . . . . . 120 p.s.i.g. (8.3 bar)
Maximum Material Inlet Pressure. . . . . . 10 p.s.i.g. (0.69 bar)
Maximum Outlet Pressure . . . . . . . . . . . . . 120 p.s.i.g. (8.3 bar)
Maximum Flow Rate . . . . . . . . . . . . . . . . . . . 172 g.p.m. (651 l.p.m.)
Displacement / Cycle @ 100 p.s.i.g. . . . . 1.4 gal. (5.3 lit.)
Maximum Particle Size . . . . . . . . . . . . . . . . 1/4”dia. (6.4 mm)
Maximum Temperature Limits (diaphragm / ball / seal material)
E.P.R. / EPDM . . . . . . . . . . . . . . . . . . . -60° to 280° F (-51° to 138° C)
Hytrel® . . . . . . . . . . . . . . . . . . . . . . . . . -20° to 150° F (-29° to 66° C)
Kynar® PVDF . . . . . . . . . . . . . . . . . . . 10° to 200° F (-12° to 93° C)
Nitrile . . . . . . . . . . . . . . . . . . . . . . . . . . 10° to 180° F (-12° to 82° C)
Santoprene® . . . . . . . . . . . . . . . . . . . -40° to 225° F (-40° to 107° C)
PTFE . . . . . . . . . . . . . . . . . . . . . . . . . . . 40° to 225° F (4° to 107° C)
Viton®. . . . . . . . . . . . . . . . . . . . . . . . . . -40° to 350° F (-40° to 177° C)
Dimensional Data. . . . . . . . . . . . . . . . . . . . . . see page 8
Air Motor / Air Cap Material
A - Aluminum / Aluminum
S
-
Stainless steel / Stainless steel
Fluid Connection
A - 2 - 11-1/2 N.P.T.F. - 1
B - Rp 2 (2 - 11 BSP parallel)
F
-
2“ A.N.S.I. / DIN Flange
Fluid Cap & Manifold Material
A - Aluminum
C - Cast Iron
H - Hastelloy®- C
Stainless steel
S
-
Hardware Material
P - Carbon steel
S
-
Stainless steel
Seat Material
A - Santoprene
C - Hytrel
H - Hard 440 stainless steel
K - Kynar PVDF
Noise Level @ 70 p.s.i., 60 c.p.m. . . . . . . 85.0 db(A)
c
d
E
F
-
-
Carbon steel
Aluminum
L
S
-
-
Hastelloy - C
316 Stainless steel
G - Nitrile
Tested with 67263 muffler assembly installed.
c
d
The pump sound pressure levels published here have been updated to
an Equivalent Continuous Sound Level (LAeq) to meet the intent of ANSI
S1.13-1971, CAGI-PNEUROP S5.1 using four microphone locations.
Ball Material
A - Santoprene
C - Hytrel
S
T
-
-
316 Stainless steel
PTFE
G - Nitrile
V - Viton
NOTICE: All possible options are shown in the chart, however, certain
combinations may not be recommended, consult a representative or
the factory if you have questions concerning availability.
Diaphragm Material
A - Santoprene
C - Hytrel
M - Medical grade Santoprene
T
-
PTFE / Santoprene
G - Nitrile
V - Viton
Accessory
0L- Diaphragm Failure Detector
Fluid Section Service Kit Selection
PD20X - XXX - X X X - B( )
637309 - X X
Example: Model #PD20A-ACS-SAA-B
Fluid Section Service Kit # 637309-AA
Ball
Diaphragm
INGERSOLL RAND COMPANY LTD
209 NORTH MAIN STREET – BRYAN, OHIO 43506
© 2012
CCN 15226509
(800) 495-0276 FAX (800) 892-6276
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GENERAL DESCRIPTION
PARTS AND SERVICE KITS
The ARO diaphragm pump offers high volume delivery even at low
air pressure and a broad range of material compatibility options are
available. Refer to the model and option chart. ARO pumps feature
stall resistant design, modular air motor / fluid sections.
Air operated double diaphragm pumps utilize a pressure differen-
tial in the air chambers to alternately create suction and a positive
fluid pressure in the fluid chambers, valve checks insure a positive
flow of fluid.
Refer to the part views and descriptions as provided on pages 4
through 7 for parts identification and service kit information.
Certain ARO “Smart Parts” are indicated which should be avail-
able for fast repair and reduction of down time.
Service kits are divided to service two separate diaphragm
pump functions: 1. AIR SECTION, 2. FLUID SECTION. The Fluid
Section is divided further to match typical part Material Op-
tions.
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Pump cycling will begin as air pressure is applied and 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.
MAINTENANCE
Provide a clean work surface to protect sensitive internal mov-
ing parts from contamination from dirt and foreign matter dur-
ing service disassembly and reassembly.
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Keep good records of service activity and include the pump in
preventive maintenance program.
Before disassembling, empty captured material in the outlet
manifold by turning the pump upside down to drain material
from the pump.
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AIR AND LUBE REQUIREMENTS
EXCESSIVE AIR PRESSURE. Can cause pump dam-
WARNING
age, personal injury or property damage.
A filter capable of filtering out particles larger than 50 microns
should be used on the air supply. There is no lubrication re-
quired other than the “O” ring lubricant which is applied during
assembly or repair.
If lubricated air is present, make sure that it is compatible with
the “O”rings and seals in the air motor section of the pump.
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FLUID SECTION DISASSEMBLY
1. Remove (61) outlet manifold and (60) inlet manifold.
2. Remove (22) balls, (19) “O”rings (if applicable) and (21) seats.
3. Remove (15) fluid caps.
NOTE: Only PTFE diaphragm models use a primary diaphragm (7)
and a backup diaphragm (8). Refer to the auxiliary view in the Fluid
Section illustration.
4. Remove the (6) diaphragm washer, (7) or 7 / 8) diaphragms and
(5) backup washer.
NOTE: Do not scratch or mar the surface of (1) diaphragm rod.
OPERATING INSTRUCTIONS
Always flush the pump with a solvent compatible with the ma-
terial being pumped if the material being pumped is subject to
“setting up”when not in use for a period of time.
Disconnect the air supply from the pump if it is to be inactive
for a few hours.
The outlet material volume is governed not only by the air sup-
ply, 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 collapse.
When the diaphragm pump is used in a forced-feed (flooded
inlet) situation, it is recommended that a “check valve” be in-
stalled at the air inlet.
Secure the diaphragm pump legs to a suitable surface to insure
against damage by vibration.
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FLUID SECTION REASSEMBLY
SERVICE NOTE: ARO pn 204214-T diaphragm assembly tool is rec-
ommended for use when reassembling the pump.
Reassemble in reverse order. Refer to the torque requirements
on page 5.
Clean and inspect all parts. Replace worn or damaged parts
with new parts as required.
Lubricate (1) diaphragm rod and (144) “U”cups with Lubriplate®
FML-2 grease (94276 grease packet is included in service kit).
For models with PTFE diaphragms: Item (8) Santoprene dia-
phragm is installed with the side marked “AIR SIDE” towards the
pump center body. Install the (7) PTFE diaphragm with the side
marked “FLUID SIDE”towards the (15) fluid cap.
Re-check torque settings after the pump has been re-started
and run a while.
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Hytrel® and Viton® are registered trademarks of the DuPont Company Loctite® is a registered trademark of Henkel Loctite Corporation Kynar® is a registered trademark of Arkema Inc.
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Santoprene® is a registered trademark of Monsanto Company, licensed to Advanced Elastomer Systems, L.P. ARO® is a registered trademark of Ingersoll-Rand Company
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Lubriplate® is a registered trademark of Lubriplate Division (Fiske Brothers Refining Company) 262™, 271™ and 572™ are trademarks of Henkel Loctite Corporation
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PD20X-XXX-XXX-B (en)
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PARTS LIST / PX20X-XXX-XXX-B( ) FLUID SECTION
637309-XX Fluid section service kit includes: Balls (see Ball Option, refer to -XX in chart below), Diaphragms (see Diaphragm Option, refer to -XX in chart
below) and items 19, 70, 144, 175 (listed below) and 174 and 94276 Lubriplate FML-2 grease (page 6).
n
SEAT OPTIONS PX20X-XXX-XXX-B( )
BALL OPTIONS PX20X-XXX-XXX-B( )
(2-1/2” diameter)
“22”
“21”
n
-XXX Seat
Qty Mtl
(4) [Sp]
-XXX Sitz
Qty Mtl
(4) [SH]
-XXX Ball
Qty Mtl
(4) [Sp]
-XXX Ball
Qty Mtl
(4) [SS]
-AXX 94328-A
-CXX 94328-C
-EXX 95677
-FXX 95673
-GXX 94328-G
-HXX 94354
-KXX 94477-K
-LXX 95639
-SXX 94353
-XAX 93358-A
-XCX 93358-C
-XGX 93358-2
-XSX 94805
-XTX 93358-4
-XVX 93358-3
(4)
(4)
(4)
(4)
[H]
[C]
[A]
[B]
(4)
[K]
(4)
(4)
[H]
[B]
(4)
(4)
[T]
[V]
(4) [Ha]
(4) [SS]
NOTE: Seat options -AXX, -CXX and -GXX do not require item 19 "O" ring.
MATERIAL CODE
[A] = Aluminum
[B] = Nitrile
[C] = Carbon Steel
[Co] = Copper
DIAPHRAGM OPTIONS PX20X-XXX-XXX-B( )
(1/8” x 3-5/8” o.d.)
“19”
Service kit
“7”
“8”
n
n
n
n
-XX = (Ball)
[CI] = Cast Iron
[E] = E.P.R.
[H] = Hytrel
-XXX
Diaphragm
Qty
Mtl Diaphragm
Qty
Mtl “O” Ring
Qty
Mtl
-XX = (Diaphragm)
-XXA 637309-XA
-XXC 637309-XC
-XXG 637309-XG
-XXM 637309-XM
-XXT 637309-XT
-XXV 637309-XV
94329-A
94329-C
94329-G
94329-M
94355-T
95344
(2)
(2)
(2)
[Sp] - - - - -
[H] - - - - -
[B] - - - - -
- - -
- - -
- - -
- - -
(2)
- - - 94356
(4)
(4)
(4)
(4)
(4)
(4)
[E]
[V]
[B]
[T]
[T]
[V]
[Ha] = Hastelloy - C
[K] = Kynar PVDF
[MSp] = Medical grade Santo-
prene
[SH] = Hard Stainless Steel
[Sp] = Santoprene
[SS] = Stainless Steel
[T] = PTFE
- - - Y327-237
- - - Y325-237
- - - Y328-237
[Sp] Y328-237
- - - Y327-237
(2) [MSp] - - - - -
(2)
(2)
[T] 94330-A
[V] - - - - -
- - -
[V] = Viton
CENTER SECTION PART OPTIONS PX20X-XXX-XXX-B( )
PD20A-XXX-XXX-B( ) PE20A-XXX-XXX-B( ) PD20S-XXX-XXX-B( ) PE20S-XXX-XXX-B( )
(size)
Item
Description
Backup Washer
Qty Part No.
(2) 96503
(1) 94324-1
(1) 94324-2
(1) - - - - -
Mtl Part No.
[A] 96503
Mtl Part No.
[A] 94357-2
[A] 94349-1
[A] 94349-2
[SS] - - - - -
[SS] Y17-51-S
[C] 96656
[B] - - - - -
Mtl Part No.
[SS] 94357-2
[SS] 94349-1
[SS] 94349-2
- - - Y17-50-S
[SS] Y17-51-S
[SS] 96656
- - - - - - - -
[B] Y325-118
[SS] Y178-56-S
Mtl
[SS]
[SS]
[SS]
[SS]
[SS]
[SS]
- - -
5
68 Air Cap
69 Air Cap
76 Pipe Plug
126 Pipe Plug
[A] 94715-1
[A] 94715-2
- - - Y17-50-S
- - - Y17-51-S
[C] 94531
(1/8 - 27 N.P.T. x 0.27”)
(1/4 - 18 N.P.T. x 7/16”)
(2) - - - - -
(M10 x 1.5 - 6g x 120 mm)
(3/32” x 1” o.d.)
131 Screw
(4) 94531
(2) Y325-117
(2) - - - - -
“O” Ring
[B] Y325-117
- - - - - - - -
175
no
no
(3/32” x 1-1/16” o.d.)
- - - Y325-118
- - - Y178-56-S
[B]
(5/32” o.d. x 3/4” long)
181 Roll Pin
(4) - - - - -
- - - - - - - -
[SS]
MANIFOLD THREAD / FLUID CAP MATERIAL OPTIONS PX20X-XXX-XXX-B( )
PX20X-XAX-
PX20X-XCX-
PX20X-XHX-
PX20X-FHX-
PX20X-XSX-
PX20X-FSX-
Mtl Part No. Mtl
[SS] 94357-2 [SS]
(size)
Item Description
6
9
14 Screw
15 Fluid Cap
Qty Part No. Mtl Part No.
Mtl Part No.
[SS] 94357-3
[SS] 95683
Mtl Part No. Mtl Part No.
[Ha] 94357-3 [Ha] 94357-2
Diaphragm Washer
Washer
(2) 96503
(2) 93065
[A] 94357-2
[SS] 93065
[Ha] 95683
[Ha] 95682
[Ha] 95679
[Ha] 96341
[Ha] 96342
- - - - - - - -
- - - - - - - -
[Ha] 93065
[Ha] Y5-111-T [SS] Y5-111-T [SS]
[Ha] 95570
[Ha] 95510-[
[Ha] 95511-[
- - - - - - - -
[SS] 93065
[SS]
(5/8” - 18 x 2-1/2”)
(2) Y5-111-T [SS] Y5-111-T [SS] 95682
(2) 94325
(1) 94327-[
(1) 94326-[
[A] 94346
[A] 94347-[
[A] 94348-[
[CI] 95679
[CI] 95680-[
[CI] 95681-[
[C] - - - - -
[SS] 95570
[SS] 95512
[SS] 95513
- - - - - - - -
- - - - - - - -
[SS]
[SS]
[SS]
- - -
60 Inlet Manifold
61 Outlet Manifold
p
]
]
p
]
]
p
]
]
q
q
p
]
]
q
q
p
p
p
p
(2 - 11-1/2 N.P.T.)
Pipe Plug
(2) Y17-128
(2) 94439-2
[A] Y17-28-C
[A] 94439-1
63
R 2 (2 - 11 BSP, taper)
[C] - - - - -
- - - - - - - -
- - -
EXTERNAL HARDWARE OPTION PX20X-XXX-XXX-B( )
PX20X-XXP-XXX-B( ) PX20X-XXS-XXX-B( )
(size)
Item
26 Screw
27 Screw
Description
Qty Part No.
(8) 94409-1
(16) 94990-1
(16) 94992-1
Mtl Part No.
[C] 94409-2
[C] 94990
[C] 94992
Mtl
[SS]
[SS]
[SS]
(M10 x 1.5 - 6g x 34 mm)
(M10 x 1.5 - 6g x 45 mm)
(M10 x 1.5 - 6h)
29 Nut
COMMON PARTS
(size)
(size)
Item
Description
Rod
Qty Part No.
(1) 94358
(1) 93004
(2) 94100
Mtl
Item
Description
Qty Part No.
(2) Y186-51
(4) 94098
Mtl
[B]
[Co]
(3/16” x 1-3/8” o.d.)
1
[C]
[Co]
[B]
144 “U” Cup
180 Gasket
no
o
(see page 7)
(0.406” i.d. x 0.031” thick)
43 Ground Lug
70 Gasket
no
Air motor kit parts, see pages 6 and 7.
For N.P.T.F. thread models (PX20X-AXX-XXX-B) use "-1".
For BSP thread models (PX20X-BXX-XXX-B) use "-2".
Flange models
qꢁ
o
p
ꢁ
“Smart Parts“, keep these items on hand in addition to the service kits for fast
repair and reduction of down time.
r
Page 4 of 8
PD20X-XXX-XXX-B (en)
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PARTS LIST / PX20X-XXX-XXX-B( ) FLUID SECTION
COLOR CODE
3
2
1
4
Diaphragm
Color
Ball
Material
Color
Hytrel
Nitrile
Cream
Black
Tan
Cream
Red (•)
Tan
5
7
8
6
Santoprene
Santoprene
(backup)
PTFE
Green
N / A
61 (PX20X-FXX-XXX-B)
White
White
Viton
Yellow (-) Yellow (•)
(-) Stripe
(•) Dot
FOR THE AIR MO-
TOR SECTION, SEE
PAGES 6 & 7.
61 (PX20X-AXX-XXX-B
Torque Sequence
PX20X-BXX-XXX-B)
26 ꢁꢂ
68 181
175
ꢃ
70
ꢃ
76
ꢅ
144
ꢃ
70
ꢃ
1
5
7
6
14 ꢁꢇ
22
21
19 ꢃꢄ
27 ꢁꢂ
ꢅ
126
144
ꢃ
ꢃ
175
15
29
ꢂ
69
180
131 ꢁꢆ
9
60 (PX20X-AXX-XXX-B
PX20X-BXX-XXX-B)
63
ꢀ
22
26 ꢁꢂ
21
60 (PX20X-FXX-XXX-B)
19 ꢃꢄ
Figure 2
ASSEMBLY TORQUE REQUIREMENTS
NOTE: DO NOT OVERTIGHTEN FASTENERS.
ALL FASTENERS ARE METRIC.
)
(
(14) Diaphragm screw, 65 - 70 ft lbs (88.1 - 94.9 Nm).
(26) Screw, 30 - 40 ft lbs (40.7 - 54.2 Nm).
(27) Screw, 30 - 40 ft lbs (40.7 - 54.2 Nm).
(131) Screw, 35 - 40 ft lbs (47.5 - 54.2 Nm).
View for PX20X-XXX-XXT-B (PTFE diaphragm) con-
figuration only.
LUBRICATION / SEALANTS
Apply Lubriplate FML-2 grease to all “O” rings, “U” cups and mating parts.
Apply Loctite® 271™ to threads.
c
d
e
Apply anti-seize compound to threads and bolt and nut flange heads
which contact pump case when using stainless steel fasteners.
Apply Loctite 262™ to threads at assembly.
f
g
h
i
j
Apply PTFE tape to threads.
Apply Loctite 572™ to threads.
(Santoprene)
(PTFE)
8
Not used with PX20X-XXX-AXX-B, -CXX and -GXX.
Not used with PX20X-XXX-XXX-B0L.
7
Note: Lubriplate FML-2 is a white food grade petroleum grease.
PD20X-XXX-XXX-B (en)
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PARTS LIST / PX20X-XXX-XXX-B( ) AIR MOTOR SECTION
Indicates parts included in 637421 air section service kit shown below and items (70), (144), (175) and (180) shown on page 4.
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AIR MOTOR PARTS
(size)
(size)
Item
101
Description
Qty Part No.
(1) 94028
(1) 94109
(1) 94092
(4) 95887
(1) 95651
(2) 94083
(2) 94084
(1) 94860
(2) Y29-42-S
(1) 94099
Mtl
Item
Description
Qty Part No.
(1) 94026
(1) 67164
(2) 94433
(1) Y240-9
(1) 94081
(1) Y325-119
(1) Y325-22
(2) Y325-26
(2) Y325-202
(2) 94102
(1) 95666
(1) 95665
(1) 67213
(1) 96336
(1) 96338
(2) 95991
(1) 96344
(1) Y325-5
(1) Y325-204
(1) Y325-208
Mtl
[B]
[D]
[U]
[B]
[Br]
[B]
[B]
[B]
[B]
[Sp]
[B]
[B]
(PX20A-XXX-XXX-B)
(PX20S-XXX-XXX-B)
Center Body
[A]
166 Track Gasket
167 Pilot Piston
to
o
(includes 168 and 169)
[SS]
[D]
(3/32” x 5/8” o.d.)
(1/8” x 7/8” o.d.)
103 Bushing
168 "O” Ring
(M6 x 1 - 6g x 20 mm)
105 Screw
[SS]
[D]
169 “U” Cup
111 Spool
170 Piston Sleeve
(0.250” x 2.276” long)
(3/32” x 1-1/8” o.d.)
118 Actuator Pin
121 Sleeve
[SS]
[D]
171 “O” Ring
172 “O” Ring
173 “O” Ring
174 “O” Ring
o
o
(1/16” x 1-1/8” o.d.)
(1/16” x 1-3/8” o.d.)
(1/8” x 1/2” o.d.)
(check valve)
(1-1/2 - 11-1/2 N.P.T.)
127 90° St. Elbow
[C / I]
[SS]
[B]
o
(1/4” - 20 x 1/4”)
128 Set Screw
132 Gasket
no
o
176 Diaphragm
199 Track Gasket
200 Gasket
o
(1/4”) (PX20A-XXX-XXX-B)
(PX20S-XXX-XXX-B)
Lockwasher
(3) Y117-416-C [C]
133
o
(3) Y14-416-T
(4) 96358
[SS]
[SS]
[A]
o
(M6 x 1 - 6g x 30 mm)
(includes item 127)
134 Screw
201 Muffler Kit
Adapter Plate
233
(PD20A-XXX-XXX-B)
(PD20S-XXX-XXX-B)
(PE20A-XXX-XXX-B)
(PE20S-XXX-XXX-B)
(PX20A-XXX-XXX-B)
(PX20S-XXX-XXX-B)
Valve Housing
(1) 96334-1
(1) 96337-1
(1) 96334-2
(1) 96337-2
(1) 96335
[A]
[SS]
[SS]
[B]
135
[SS]
[A]
(M6 x 1 - 6g x 16 mm)
240 Screw
[SS]
[A]
241 Track Gasket
o
o
o
o
(PX20A-XXX-XXX-B)
(1/16” x 7/32” o.d.)
Plug
242 “O” Ring
243 “O” Ring
244 “O” Ring
[B]
136
(PX20S-XXX-XXX-B)
(1/16” x 2” o.d.)
(1/8” x 5/8” o.d.)
(1/8” x 7/8” o.d.)
(1) 96339
[SS]
[B]
[B]
137 “O” Ring
138 “U” Cup
139 “U” Cup
(1) Y325-32
(1) 95966
[B]
o
o
o
(3/16” x 1.792” o.d.)
(3/16” x 1-1/4” o.d.)
[B]
(1) Y186-50
(1) 95650
[B]
Lubriplate FML-2 grease
(1) 94276
637308
n o
140 Valve Insert
141 Valve Plate
(Ck)
(Ck)
[B]
Lubriplate Grease Packets (10)
(1) 95659
Items included in fluid section service kit, see pages 4 and 5.
Used on models PX20S-XXX-XXX-B( ) only.
Used on models PX20A-XXX-XXX-B( ) only.
n
s
t
(3/32” x 1-1/16” o.d.)
146 “O” Ring
147 “O” Ring
(1) Y325-118
(2) Y325-202
so
so
(1/8” x 1/2” o.d.)
[B]
MATERIAL CODE
3. Install new (168) “O”rings and (169) seal - Note the lip direction.
Lubricate and replace (167) pilot piston.
[A] = Aluminum
[B] = Nitrile
[Br] = Brass
[C] = Carbon Steel
[Ck] = Ceramic
[D] = Acetal
[I] = Iron
[Sp] = Santoprene
[SS] = Stainless Steel
[U] = Polyurethane
4. Reassemble remaining parts. Replace (173 and 174) “O”rings.
MAJOR VALVE DISASSEMBLY
1. Remove (135) valve block and (233) adapter plate, exposing
(132 and 166) gaskets and (176) checks.
AIR MOTOR SECTION SERVICE
Service is divided into two parts - 1. Pilot Valve, 2. Major Valve.
GENERAL REASSEMBLY NOTES:
2. Remove (233) adapter plate, releasing (140) valve insert, (141)
valve plate, (199, 200 and 241) gaskets and (243 and 244) “O”
rings.
Air Motor Section service is continued from Fluid Section repair.
y
Inspect and replace old parts with new parts as necessary. Look
3. Remove (136) plug and (137) “O”ring, releasing (111) spool.
y
for deep scratches on metallic surfaces, and nicks or cuts in “O”
rings.
MAJOR VALVE REASSEMBLY
Take precautions to prevent cutting “O”rings upon installation.
Lubricate “O”rings with Lubriplate FML-2 grease.
Do not over-tighten fasteners. Refer to torque specification
block on view.
Re-torque fasteners following restart.
SERVICE TOOLS - To aid in the installation of (168) “O”rings onto
the (167) pilot piston, use tool # 204130-T, available from ARO.
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1. Install new (138 and 139) “U” cups on (111) spool - LIPS MUST
FACE EACH OTHER.
2. Insert (111) spool into (135) valve block.
3. Install (137 and 242) “O” rings on (136) plug and assemble plug
to (135) valve block, securing with (105) screws.
4. Install (140) valve insert, (141) valve plate, (199) gasket and (243
and 244)„O“ rings into (135) valve block. NOTE: Assemble (140)
valve insert with “dished” side toward (141) valve plate. Assem-
ble (141) valve plate with part number identification toward
(140) valve insert.
y
y
PILOT VALVE DISASSEMBLY
1. A light tap on (118) actuator pin should expose the opposite
(121) sleeve, (167) pilot piston and other parts.
2. Remove (170) sleeve. Inspect inner bore of sleeve for damage.
5. Assemble (200 and 241) gaskets and (233) adapter plate to (135)
valve block, securing with (240) screws.
6. Assemble (132 and 166) gaskets and (176) checks to (101) cen-
ter body.
7. Assemble (135) valve block and components to (101) center
body, securing with (134) screws.
PILOT VALVE REASSEMBLY
1. Clean and lubricate parts not being replaced from service kit.
2. Install new (171 and 172) “O”rings. Replace (170) sleeve.
Page 6 of 8
PD20X-XXX-XXX-B (en)
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PARTS LIST / PX20X-XXX-XXX-B( ) AIR MOTOR SECTION
Substitute these “O“ rings for
k
PILOT VALVE
PART GROUP
(166) gasket on models PX20S-
XXX-XXX-B( ).
118
ꢃ
169 168
ꢃ
147
146
ꢃ
172
ꢃ
ꢃ
ꢃ
ꢃ
174
121
173
167
171ꢃ
170
173
121
118
174
ꢃ
ꢃ
140 199
ꢃ
244
ꢃ
243
ꢃ
233 132
ꢃ
166 ꢃꢈ
135
133
103
101
ꢂꢉ 134
43
141
ꢃ
241
200
ꢃ
128
ꢇ
240 ꢁꢂ 176
ꢃ
ꢃ
138
ꢃ
Optional 94117 Muffler
111
139
242
128
ꢃ
ꢃ
ꢇ
ꢃ
137
136
201
127
105 ꢁꢂ
MAJOR VALVE
Figure 3
ASSEMBLY TORQUE REQUIREMENTS
NOTE: DO NOT OVERTIGHTEN FASTENERS.
ALL FASTENERS ARE METRIC.
LUBRICATION / SEALANTS
)
(
Apply Lubriplate FML-2 grease to all “O” rings, “U” cups and mat-
ing parts.
c
Apply Loctite 271 to threads.
d
e
(105) Screw, 40 - 50 in. lbs (4.5 - 5.6 Nm).
(134) Screw, 40 - 50 in. lbs (4.5 - 5.6 Nm).
(240) Screw, 40 - 50 in. lbs (4.5 - 5.6 Nm).
Apply anti-seize compound to threads and bolt and nut flange
heads which contact pump case when using stainless steel fas-
teners.
A replacement major valve service assembly is available separately, which includes the following:
637374-2 for models PD20A-XXX-XXX-B: 105 (4), 111, 128 (2), 132, 133 (3), 134 (4), 135, 136, 137, 138, 139, 140, 141, 166, 176 (2), 199, 200, 233, 240 (2),
241, 242, 243 and 244.
637374-3 for models PE20A-XXX-XXX-B: 76, 105 (4), 111, 128 (2), 132, 133 (3), 134 (4), 135, 136, 137, 138, 139, 140, 141, 166, 176 (2), 199, 200, 233, 240 (2),
241, 242, 243 and 244.
637374-4 for models PD20S-XXX-XXX-B: 105 (4), 111, 128 (2), 132, 133 (3), 134 (4), 135, 136, 137, 138, 139, 140, 141, 146, 147, 176 (2), 199, 200, 233, 240 (2),
241, 242, 243 and 244.
637374-5 for models PE20S-XXX-XXX-B: 76, 105 (4), 111, 128 (2), 132, 133 (3), 134 (4), 135, 136, 137, 138, 139, 140, 141, 146, 147, 176 (2), 199, 200, 233, 240
(2), 241, 242, 243 and 244.
PD20X-XXX-XXX-B (en)
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TROUBLE SHOOTING
Product discharged from exhaust outlet.
Low output volume, erratic flow or no flow.
Check for diaphragm rupture.
Check air supply.
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Check tightness of (14) diaphragm screw.
Check for plugged outlet hose.
Check for kinked (restrictive) outlet material hose.
Check for kinked (restrictive) or collapsed inlet material hose.
Check for pump cavitation - suction pipe should be sized at
least as large as the inlet thread diameter of the pump for
proper flow if high viscosity fluids are being pumped. Suction
hose must be a non-collapsing type, capable of pulling a high
volume.
Air bubbles in product discharge.
Check connections of suction plumbing.
Check “O” rings between intake manifold and inlet side fluid
caps.
y
y
Check tightness of (14) diaphragm screw.
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Motor blows air or stalls.
Check all joints on the inlet manifolds and suction connections.
These must be air tight.
Inspect the pump for solid objects lodged in the diaphragm
chamber or the seat area.
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Check (176) check valve for damage or wear.
Check for restrictions in valve / exhaust.
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DIMENSIONAL DATA
Dimensions shown are for reference only, they are displayed in inches and millimeters (mm).
P
E
l
Material outlet
(PX20X-AXX-XXX-B) T
(PX20X-BXX-XXX-B) U
L
F
S (Material outlet)
(PX20X-FXX-XXX-B)
L
G
B
N (Bolt circle)
Air Inlet
3/4 - 14 N.P.T.F. - 1
Q
B
R
D
D
H
K
Dotted lines show optional
67263 muffler assembly.
M
J
S (Material inlet)
C
(PX20X-FXX-XXX-B)
A
l
Material inlet
(PX20X-AXX-XXX-B) T
Exhaust port 1-1/2 - 11-1/2 N.P.T.
Figure 4
(PX20X-BXX-XXX-B) U
DIMENSIONS
A - see below
F
- 12”(304.8 mm)
L
- see below
R - see below
B - 24-3/4”(628.7 mm)
C - 10-1/16”(255.6 mm)
D - see below
G - 26-1/4” (666.8 mm)
H - 9-1/16” (230.2 mm)
M - 5/8” (15.9 mm)
S
T
- 2”A.N.S.I. / DIN Flange
- 2 - 11-1/2 N.P.T.F. - 1
N - 4.834”(122.8 mm)
P - 21-5/8” (548 mm)
Q - 27-7/8” (708.0 mm)
J
- 10-1/16”(255.6 mm)
U - Rp 2 (2 - 11 BSP, parallel)
E
- 16-3/16”(411.2 mm)
K - 9/16” (14.3 mm)
l Side Discharge Ports are not available on PX20X-XSX-X-B Models.
“A”
“D”
“L”
“R”
PX20X-XAX-XXX-B( )
PX20X-XCX-XXX-B( )
PX20X-AHX-XXX-B( )
PX20X-BHX-XXX-B( )
PX20X-ASX-XXX-B( )
PX20X-BSX-XXX-B( )
PX20X-FHX-XXX-B( )
PX20X-FSX-XXX-B( )
19-3/4”(501.7 mm)
19-3/4”(501.7 mm)
19-1/4”(488.7 mm)
19-1/4”(488.7 mm)
19-3/8”(492.1 mm)
19-3/8”(492.1 mm)
19-1/4”(488.7 mm)
19-3/8”(492.1 mm)
1-7/8”(47.6 mm)
1-7/8”(47.6 mm)
2-1/2”(63.5 mm)
2-1/2”(63.5 mm)
2-1/2”(63.5 mm)
2-1/2”(63.5 mm)
2-1/2”(63.5 mm)
2-1/2”(63.5 mm)
2”(50.8 mm)
2”(50.8 mm)
12-15/16”(328.6 mm)
12-15/16”(328.6 mm)
13-9/16”(344.5 mm)
13-9/16”(344.5 mm)
13-9/16”(344.5 mm)
13-9/16”(344.5 mm)
13-9/16”(344.5 mm)
13-9/16”(344.5 mm)
2-3/32”(53.0 mm)
2-3/32”(53.0 mm)
2-3/32”(53.2 mm)
2-3/32”(53.2 mm)
3-1/4”(82.6 mm)
3-1/4”(82.6 mm)
PN 97999-1108
PD20X-XXX-XXX-B (en)
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