ARO PM20 Series User manual

INGERSOLL RAND COMPANY INC
209 NORTH MAIN STREET – BRYAN, OHIO 43506
[phone] FAX [phone] © 2021 CCN 15227689
arozone.com
OPERATOR’S MANUAL PM20X-X-X-BXX
INCLUDING: OPERATION, INSTALLATION AND MAINTENANCE RELEASED: 2-8-05
REVISED: 7-23-21
(REV: L)
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 mate-
rial options.
637309-XXX for Fluid Section Repair with seats (see page 5).
637309-XX for Fluid Section Repair without seats
(see page 5).
NOTE: This kit also contains several air motor seals which will
need to be replaced.
637421 for Air Section Repair (see page 7).
637374-X Major Air Valve Assembly (see page 8).
PUMP DATA
Models............see Model Description Chart for “-XXX”
Pump Type........Metallic Air Operated Diaphragm Pump
Material...........see Model Description Chart
Weight ... PM20A-CSS-XXX-BXX ..... 142.8 lbs (64.8 kgs)
PM20S-CSS-XXX-BXX ..... 171.7 lbs (77.9 kgs)
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 (Flooded inlet) ..... 170 gpm (644 lpm)
Displacement / Cycle @ 100 psig .... 1.4 gal. (5.3 lit.)
Maximum Particle Size ............. 1/4” dia. (6.4 mm)
Maximum Temperature Limits (diaphragm / ball / seat materials)
E.P.R ...................... -60

to 280

F (-51

to 138

C)
Santoprene

............. -40

to 225

F (-40

to 107

C)
PTFE. . . . . . . . . . . . . . . . . . . . . . 40

to 225

F (4

to 107

C)
Dimensional Data................... see page 9
Mounting Dimension . 9-1/16”x 10-1/16”(230 mm x 256 mm)
Noise Level @ 70 psig, 60 cpm

...... 85.0 dB(A)

Tested with 67263 muer assembly installed.
The pump sound pressure levels published here have been updated to
an Equivalent Continuous Sound Level (LA
eq
) to meet the intent of ANSI
S1.13-1971, CAGI-PNEUROP S5.1 using four microphone locations.
Figure 1

Page 2 of 12 PM20X-X-X-BXX (en)
MODEL DESCRIPTION CHART
Model Code Explanation
PM20 X -CSS-XXX-BX
X
Center Section Material
A - Aluminum
Port
Fluid Caps and Manifold Material
S - Stainless Steel
Hardware Material
S- Stainless Steel
Seat Material
Ball Material
Diaphragm Material
Revision
B- Revision
Specialty Code 1 (Blank if no Speciality Code)
B- Solenoid 12 VDC, 24 VAC AND 22 VAC
D- Solenoid 24 VDC, 48 VAC AND 44 VAC
A- Solenoid 120 VAC,110 VAC AND 60 VDC
C- Solenoid 240 VAC, 220 VAC AND 120 VDC
G- Solenoid 12 VDC ATEX / IECEx
H- Solenoid 24 VDC ATEX / IECEx
K- Solenoid 220 VAC ATEX / IECEx
N- Solenoid with no Coil
P- Ported Motor (No major valve)
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.
G- End of Stroke ATEX / IECEx / NEC / CEC
F- End of Stroke feedback
E- End of Stroke feedback + Leak Detection
R- End of Stroke NEC
H- End of Stroke + Leak Detection ATEX / IECEx / NEC / CEC
L- Leak Detection
M-
Leak Detection ATEX / IECEx / NEC / CEC
E- Solenoid 12 VDC NEC / CEC
F- Solenoid 24 VDC NEC / CEC
J- Solenoid 120 VAC NEC / CEC
C - Sanitary Flange
0- Standard Valve Block (No Solenoid)
S- Cycle Sensing on Major Valve
T- End of Stroke NEC / Leak Detection NEC
2- No option
Specialty Code 2 (Blank if no Speciality Code)
M -Medical Grade Santoprene
M -Medical Grade Santoprene
T - PTFE
L - Long Life PTFE
M -Medical Grade Santoprene
T - PTFE / Santoprene
S - 316 Stainless Steel
S - Stainless Steel
Fluid Section Service Kit Selection
EXAMPLE: Model #PM20S-CSS-SMM-BXX
Fluid Section Service Kit # 637309-MM
PM20X - XXX - X X X - BXX
Ball Diaphragm
637309 - X X

PM20X-X-X-BXX (en) Page 3 of 12
WARNING
EXCESSIVE AIR PRESSURE. Can cause per-
sonal 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 uid 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 result-
ing in severe injury or death. Ground pump and
pumping system.
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
electrical 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.
WARNING
Pump exhaust may contain contaminants.
Can cause severe injury. Pipe exhaust away from work
area 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 1” minimum ID hose between the
pump and the muer.
WARNING
HAZARDOUS PRESSURE. Can result in seri-
ous injury or property damage. Do not service or
clean pump, hoses or dispensing valve while the sys-
tem 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.
OPERATING AND SAFETY PRECAUTIONS
READ, UNDERSTAND AND FOLLOW THIS INFORMATION TO AVOID INJURY AND PROPERTY DAMAGE.
yObtain Material Safety Data Sheets on all materials
from the supplier for proper handling instructions.
WARNING
EXPLOSION HAZARD. Models containing alu-
minum wetted parts cannot be used with 1,1,1-trichlo-
roethane, 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.
WARNING
MISAPPLICATION HAZARD. Do not use mod-
els containing aluminum wetted parts with food prod-
ucts for human consumption. Plated parts can contain
trace amounts of lead.
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 signi-
cantly reduce maximum safe operating temperature.
Consult the chemical manufacturer for chemical com-
patibility 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, under-
stand it’s limitations, and wear safety goggles / equip-
ment when required.
CAUTION
Do not use the pump for the structural sup-
port of the piping system. Be certain the system com-
ponents are properly supported to prevent stress on
the pump parts.
ySuction and discharge connections should be flex-
ible 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 & Diaphragm Rupture” pn
\ 94080.
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 injury,
product or property damage.
NOTICE
= Important installation, operation or
maintenance information.
EXCESSIVE AIR PRESSURE
STATIC SPARK
HAZARDOUS MATERIALS
HAZARDOUS PRESSURE

Page 4 of 12 PM20X-X-X-BXX (en)
PARTS AND SERVICE KITS
Refer to the part views and descriptions as provided on page
5 through 8 for parts identication and Service Kit informa-
tion.
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.
MAINTENANCE
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 (61) outlet manifold, (60) inlet manifold.
2. Remove (22) balls, (19) “O” rings (where applicable) 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.
4. Remove the (6) diaphragm washer, (7) or (7 / 8) dia-
phragms, and (5) backup washer.
NOTE: Do not scratch or mar the surface of (1) diaphragm
rod.
FLUID SECTION REASSEMBLY
yReassemble in reverse order. Refer to the torque require-
ments on page 6.
yClean and inspect all parts. Replace worn or damaged
parts with new parts as required.
yLubricate (1) diaphragm rod and (144) “U” cup with Lu-
briplat

FML-2 grease (94276 grease packet is included in
service kit).
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
(7) with the side marked “FLUID SIDE” towards the (15)
uid cap.
yRe-check torque settings after pump has been re-started
and run a while.
GENERAL DESCRIPTION
The ARO diaphragm pump oers high volume delivery even
at low air pressure and a broad range of material compat-
ibility 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 create suction
and positive uid pressure in the uid chambers, ball 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 maxi-
mum line pressure is reached (dispensing device closed) and
will resume pumping as needed.
AIR AND LUBE REQUIREMENTS
WARNING
EXCESSIVE AIR PRESSURE. Can cause pump
damage, personal injury or property damage.
yA filter capable of filtering out particles larger than 50
microns should be used on the air supply. There is no lu-
brication 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 Nitrile “O” rings 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 col-
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.
yLoctite® and 242® are registered trademarks of Henkel Loctite Corporation yARO® is a registered trademark of Ingersoll-Rand Company y
ySantoprene® is a registered trademark of ExxonMobil yLubriplate® is a registered trademark of Lubriplate Lubricants Company y

PM20X-X-X-BXX (en) Page 5 of 12
PARTS LIST / PM20X-X-X-BXX FLUID SECTION
FLUID SECTION SERVICE KITS (637309-XXX or 637309-XX)
For Fluid Kits With Seats:
637309-XXX 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), Dia-
phragms (see DIAPHRAGM Option, refer to -XXX in chart below), and items: 19, 70, 144, 175, (listed below) plus 174 and 94276 Lubriplate FML-2 grease (page 7).
For Fluid Kits Without Seats:
637309-XX Fluid Section Service Kits include: Balls (see BALL Option, refer to -XX in chart below), Diaphragms (see DIAPHRAGM Option, refer to -XXin chart below),
and items: 19, 70, 144, 175, (listed below) plus 174 and 94276 Lubriplate FML-2 grease (page 7).
COMMON PARTS
SEAT OPTIONS
PM20X-CSS-XXX-BXX
BALL OPTIONS
PM20X-CSS-XXX-BXX
“21” “22” (2-1/2” diameter)
-XXX Seat Qty [Mtl] -XXX Ball Qty [Mtl]
-MXX 94328-M (4) [MSP] -XMX 93358-M (4) [MSP]
-SXX 94353 (4) [SS] -XTX 93358-4 (4) [T]
DIAPHRAGM OPTIONS PM20X-CSS-XXX-BXX
Service Kit
with seats
Service Kit
without seats “7” “8” “19”
-XXX
-XXX = (Seats)
-XXX = (Ball)
-XXX = (Diaphragm)
-XX = (Ball)
-XX = (Diaphragm) Diaphragm Qty [Mtl] Diaphragm Qty [Mtl] “O” Ring Qty [Mtl]
-XXL 637309-XXL 637309-XL 94355-L (2) [L] 94330-A (2) [SP] Y328-237 (4) [T]
-XXM 637309-XXM 637309-XM 94329-M (2) [MSP] ----- --- --- Y328-237 (4) [T]
-XXT 637309-XXT 637309-XT 94355-T (2) [T] 94330-A (2) [SP] Y328-237 (4) [T]
CENTER SECTION PART OPTIONS PM20X-CSS-XXX-BXX
ALUMINUM Stainless Steel
PM20A-CSS-XXX-BXX PM20S-CSS-XXX-BXX
Item Description (size) Qty Part No. [Mtl] Part No. [Mtl]
5Backup Washer (2) 96503 [A] 94357-2 [SS]
68 Air Cap (1) 94715-1 [A] 94349-1 [SS]
69 Air Cap (1) 94715-2 [A] 94349-2 [SS]

175
“O” Ring (3/32” x 1” OD) (2) Y325-117 [B] ----- ---
(3/32” x 1-1/16” OD) (2) ----- --- Y325-118 [B]
181 Roll Pin (5/32” OD x 3/4” long) (4) ----- --- Y178-56-S [SS]
“Smart Parts”, keep these items on hand in addition to the Service Kits for fast repair and reduction of down time.
 Air Motor Kit parts, see pages 7.
Item Description (size) Qty Part No. [Mtl]
1 Rod (1) 97386 [C]
6Diaphragm Washer (2) 97316 [SS]
9 Washer (2) 97318 [SS]
14 Screw (5/8” - 18 x 2-1/2”) (2) 97319 [SS]
15 Fluid Cap (2) 95570-1 [SS]
26 Screw (M10 x 1.5 - 6g x 35 mm) (8) 94409-2 [SS]
27 Screw (M10 x 1.5 - 6g x 45 mm) (16) 94990 [SS]
29 Nut (M10 x 1.5 - 6g) (16) 94992 [SS]
43 Ground Lug (1) 93004 [Co]
Item Description (size) Qty Part No. [Mtl]
60 Inlet Manifold (1) 95508 [SS]
61 Outlet Manifold (1) 95509 [SS]
70 Gasket (2) 94100 [B]
131
Screw (M10 x 1.5 - 6g x 120 mm)
(PM 20A) (4)
94531 [C]
(PM20S) 96656 [SS]
144 "U” Cup (3/16” x 1-3/8” OD) (2) Y186-51 [B]
180 Washer (0.406” ID x 0.031” thick) (4) 94098 [Co]
MATERIAL CODE
[A] = Aluminum
[B] = Nitrile
[C] = Carbon Steel
[Co] = Copper
[L] = Long Life PTFE
[MSp] = Medical Grade
Santoprene
[SP] = Santoprene
[SS] = Stainless Steel
[T] = PTFE
NOTE: Seat options -MXX donot require SEAT OPTIONS item 19 “O” ring.

Page 6 of 12 PM20X-X-X-BXX (en)
PARTS LIST / PM20X-X-X-BXX FLUID SECTION
Figure 2
1
26
FORTHE
AIR MOTOR SECTION
SEE PAGES7AND 8
43
68
60
(Santoprene)
87
(PTFE)
7
5
21
19
180131
175
70 69
VIEW OF TWOPIECE PTFE DIAPHRAGM
27
22
70
6149
144
TORQUE REQUIREMENTS
NOTE: DO NOT OVERTIGHTEN FASTENERS.
ALL FASTENERS ARE METRIC.
LUBRICATION/SEALANTS
Lubriplate FML-2 is a white food grade petroleum
grease.
Apply Lubriplate FML-2 grease to all “O” rings,
“U” cups and mating parts.
Used with PM20X-CSS-SXX-BXX models only.
Apply Loctite 242 to threads at assembly.
Apply PTFE tape to threads at assembly.
Apply anti-seize compound to threads.
COLOR CODE
DIAPHRAGM BALL
MATERIAL COLORCOLOR
Santoprene TanTan
Santoprene GreenN/A
(Backup)
PTFE WhiteWhite
8
6
4
1
2
3
5
7
Torque Sequence
74
29
(14) Diaphragm screw,apply Loctite #271 to threads,
65 -70ftlbs (88.1-94.9Nm).
(26and 27) Fluid caps/manifold screw
30 -40ftlbs (40.7-54.2Nm).
(131) Screw, 35 -40ftlbs (47.5-54.2 Nm).
144
61
26
175
181
15
21
19
22

PM20X-X-X-BXX (en) Page 7 of 12
PARTS LIST / PM20X-X-X-BXX AIR MOTOR SECTION
Indicates parts included in 637421 Air Section Service Kit shown below and items (70), (144), (175), (180) shown on page 5.
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 uid 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 Lubriplate FML-2 grease.
yDo not over-tighten fasteners, refer to torque specifica-
tion block on view.
yRe-torque fasteners following re-start.
yService Tools - To aid in the installation of (168) “O” rings
onto the (167) pilot piston, use tool #204130-T, available
from ARO.
PILOT VALVE DISASSEMBLY
1. A light tap on (118) should expose the opposite (121)
sleeve, (167) pilot piston and other parts.
2. Remove (170) sleeve. Inspect inner bore of sleeve for
damage.
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.
3. Install new (168) “O” rings and (169) seal - Note the lip di-
rection. Lubricate and replace (167) pilot piston.
4. Reassemble remaining parts. Replace (173 and 174) “O”
rings.
MAJOR VALVE DISASSEMBLY
1. Remove (135) valve block and (233) adapter plate, expos-
ing (166 and 132) gaskets and (176) checks.
2. Remove (233) adapter plate, releasing (140) valve insert,
(141) valve plate, (199, 200 and 241) gaskets and (231,
243 and 244) “O” rings.
3. Remove (136) plug and (137) “O” ring, releasing (111)
spool.
MAJOR VALVE REASSEMBLY
1. Install new (138 and 139) “U” cups on (111) spool - LIPS
MUST FACE EACH OTHER.
2. Insert (111) spool into (135) valve housing.
3. Install (137 and 242) “O” rings on (136) plug and assemble
plug to (135) valve housing, securing with (105) screws.
AIR MOTOR PARTS LIST
Item Description (size) (Qty) Part No. [Mtl] Item Description (size) (Qty) Part No. [Mtl]
74 Plug (2) Y17-51-S [SS]
101 Center Body (PM20A-X-X-BXX) (1) 97031 [A]
(PM20S-X-X-BXX) (1) 97040 [SS]
103 Bushing (1) 97394 [D]
105 Screw (M6 x 1 - 6g x 20 mm) (4) 95887 [SS]
111 Spool (1) 95651 [D]
118 Actuator Pin (0.250” x 2.276” long) (2) 94083 [SS]
121 Sleeve (2) 94084 [D]
126 Plug (1) Y17-13-S [SS]
127 90 St.Elbow (1-1/2-11-1/2 NPT) (1) 94860 [C/I]
128 Set Screw (1/4” - 20 x 1/4”) (2) Y29-42-S [SS]
132 Gasket (1) 94099 [B]
133 Lockwasher (1/4”) (PM20A-X-X-BXX) (3) Y117-416-C [C]
(PM20S-X-X-BXX) (3) Y14-416-T [SS]
134 Screw (M6 x 1 - 6g x 35 mm) (4) 95923 [SS]
135 Valve Housing (PM20A-X-X-B02) (1) 96334-1 [A]
(PM20S-X-X-B02) (1) 96337-1 [SS]
136 Plug (PM20A-X-X-BXX) (1) 96335 [A]
(PM20S-X-X-BXX) (1) 96339 [SS]
137 “O” Ring (1/16” x 2” OD) (1) Y325-32 [B]
138 “U” Cup (3/16” x 1.792” OD) (1) 95966 [B]
139 “U” Cup (3/16” x 1-1/4” OD) (1) Y186-50 [B]
140 Valve Insert (1) 95650 [Ck]
141 Valve Plate (1) 95659 [Ck]

146 “O” Ring (3/32” x 1-1/16” OD) (1) Y325-118 [B]

147 “O” Ring (1/8” x 1/2” OD) (2) Y325-202 [B]

166 Track Gasket (1) 94026 [B]
167 Pilot Piston (includes 168 and 169) (1) 67164 [D]
168 “O” Ring (3/32” x 5/8” OD) (2) 94433 [U]
169 “U” Cup (1/8" x 7/8" OD) (1) Y240-9 [B]
170 Piston Sleeve (1) 94081 [D]
171 “O” Ring (3/32” x 1-1/8” OD) (1) Y325-119 [B]
172 “O” Ring (1/16” x 1-1/8” OD) (1) Y325-22 [B]
173 “O” Ring (1/16” x 1-3/8” OD) (2) Y325-26 [B]

174 “O” Ring (1/8” x 1/2” OD) (2) Y325-202 [B]
176 Diaphragm (check valve) (2) 94102 [SP]
199 Track Gasket (1) 95666 [B]
200 Gasket (1) 95665 [B]
201 Muer (includes item 127) (1) 67213
233 Adapter Plate (PM20A-X-X-BXX) (1) 96336 [A]
(PM20S-X-X-BXX) (1) 96338 [SS]
240 Screw (M6 x 1 - 6g x 16 mm) (2) 95991 [SS]
241 Track Gasket (1) 96344 [B]
242 “O” Ring (1/16” x 7/32” OD) (1) Y325-5 [B]
243 “O” Ring (1/8” x 5/8” OD) (1) Y325-204 [B]
244 “O” Ring (1/8” x 7/8” OD) (1) Y325-208 [B]
 Lubriplate FML-2 Grease (1) 94276
Lubriplate Grease, 10 Pack 637308
Used on models PM20S-CSS-XXX-BXX only
Used on models PM20A-CSS-XXX-BXX only
Fluid Section Kit parts, see page 5.

Page 8 of 12 PM20X-X-X-BXX (en)
PARTS LIST / PM20X-X-X-BXX AIR MOTOR SECTION
4. Install (140) valve insert, (141) valve plate, (199) gasket
and (231, 243 and 244) “O” rings into (135) valve housing.
NOTE: Assemble (140) valve insert with “dished” side to-
ward (141) valve plate. Assemble (141) valve plate with
part number identication toward (140) valve insert.
5. Assemble (200 and 241) gaskets and (233) adapter plate
to (135) valve housing, securing with (240) screws. NOTE:
Tighten screws to 40 - 50 in. lbs (4.5 - 5.6 Nm).
6. Assemble (132 and 166) gaskets and (176) checks to (101)
center body.
7. Assemble (135) valve housing and components to (101)
center body, securing with (134) screws. NOTE: Tighten
screws to 40 - 50 in. lbs (4.5 - 5.6 Nm).
168
105
TORQUE REQUIREMENTS
Torque (105) Screwto40-50 in.lbs (4.5 -5.6 Nm).
Torque (240) Screwto40-50 in.lbs (4.5 -5.6 Nm).
LUBRICATION / SEALANTS
NOTE: DONOT OVERTIGHTEN FASTENERS.
ALL FASTENERS ARE METRIC.
Apply Lubriplate FML-2grease to “O”rings, “U”Cups
and mating parts.
Apply Loctite 271 to threadsatassembly.
136
137
139
111
138
135
133
134
101
103
174
121
126
118
173
169 172
171
170
167
173
121
174
118
166
132
243244
199
141
140
240200 241 128 176
MAJOR
VALVE
Areplacement MajorValve ServiceAssembly is availableseparately,which includes thefollowing:
637374-2 formodelsPM20A-X:105 (4), 111,128 (2), 132, 135,136, 137, 138, 139, 140, 141, 166, 176(2),199, 200,233, 240 (2), 241,242, 243 and 244.
637374-4 formodelsPM20S-X:105 (4), 111,128 (2), 132, 135, 136, 137, 138, 139, 140, 141, 146,147, 176(2),199, 200,233, 240(2),241, 242, 243and 244.
Optional9411
Muer
128
233
242
147
146
Substitute these “O” rings for
“166” gasket on models
PM20S-CSS-XXX-BXX.
MATERIALCODE
[A]= Aluminum
[B]= Nitrile
[C] =Carbon Steel
[Ck]= Ceramic
[D]= Acetal
[I] =Iron
[SP] =Santoprene
[SS] =Stainless Steel
[U]= Polyurethane
PILOTVALVE
PART GROUP
Torque (134) Screwto40-50 in.lbs (4.5 -5.6 Nm).
127
201
Figure 3

PM20X-X-X-BXX (en) Page 9 of 12
DIMENSIONAL DATA
TROUBLESHOOTING
Product discharged from exhaust outlet.
yCheck for diaphragm rupture.
yCheck tightness of (14) diaphragm screw.
Air bubbles in product discharge.
yCheck connections of suction plumbing.
yCheck “O” rings between intake manifold and inlet side
uid caps.
yCheck tightness of (14) diaphragm screw.
Motor blows air or stalls.
yCheck (176) check valve for damage or wear.
yCheck for restrictions in valve / exhaust.
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 logged in the dia-
phragmchamber or the seat area.
INLET
OUTLET
Exhaust Port
1-1/2-11-1/2 NPTF
19-11/32” (491.3 mm)
9/16” Slot (14.3mm)
10-1/16”
(255.6mm)
24-3/4”
(628.7
mm)
2-1/2”
(63.5mm)
AirInlet
3/4-14 NPTF
26-9/32”
(667.4 mm)
2-1/2” Sanitary Flange
2-1/2” Sanitary Flange
13-9/16”
(344.5mm)
(Dimensions shownare forreferenceonly, they aredisplayed in inches and millimeters(mm)).
21-5/8” (548.2 mm)
16-3/16” (411.1 mm)
12” (304.8mm)
3”(76.2mm)
9-1/16”
(230.2 mm)
10-1/16”
(255.6mm)
Dottedlines show optional
67213 muerkit.
2-1/2” Sanitary Flange
Dotted
lines show optional
67263
muerassembly.
Figure 4

Page 10 of 12 PM20X-X-X-BXX (en)