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Indicates parts included in 637421 Air Section Service Kit shown below and items (70), (144), (175), (180) shown on page 5.
Item Description
(size)
74 Plug
Center Body
(PM20A-X-X-BXX)
101
(PM20S-X-X-BXX)
103 Bushing
105 Screw
(M6 x 1 - 6g x 20 mm)
111 Spool
118 Actuator Pin
(0.250" x 2.276" long)
121 Sleeve
126 Plug
127 900 St.Elbow
(1-1/2-11-1/2 NPT)
128 Set Screw
(1/4" - 20 x 1/4")
132 Gasket
Lockwasher
(1/4") (PM20A-X-X-BXX)
133
(PM20S-X-X-BXX)
134 Screw
(M6 x 1 - 6g x 35 mm)
Valve Housing
(PM20A-X-X-B02)
135
(PM20S-X-X-B02)
Plug
(PM20A-X-X-BXX)
136
(PM20S-X-X-BXX)
137 "O" Ring
(1/16" x 2" OD)
138 "U" Cup
(3/16" x 1.792" OD)
139 "U" Cup
(3/16" x 1-1/4" OD)
140 Valve Insert
141 Valve Plate
"O" Ring
(3/32" x 1-1/16" OD)
146
"O" Ring
(1/8" x 1/2" OD)
147
AIR MOTOR SECTION SERVICE
Service is divided into two parts - 1. Pilot Valve, 2. Major
Valve.
GENERAL REASSEMBLY NOTES:
Air motor section service is continued from fluid section
y
repair.
Inspect and replace old parts with new parts as neces-
y
sary. Look for deep scratches on metallic surfaces, and
nicks or cuts in "O" rings.
Take precautions to prevent cutting "O" rings upon instal-
y
lation.
Lubricate "O" rings with Lubriplate FML-2 grease.
y
Do not over-tighten fasteners, refer to torque specifica-
y
tion block on view.
Re-torque fasteners following re-start.
y
Service Tools - To aid in the installation of (168) "O" rings
y
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.
PM20X-X-X-BXX (en)
PARTS LIST / PM20X-X-X-BXX AIR MOTOR SECTION
AIR MOTOR PARTS LIST
(Qty) Part No.
(2) Y17-51-S
(1) 97031
(1) 97040
(1) 97394
(4) 95887
(1) 95651
(2) 94083
(2) 94084
(1) Y17-13-S
(1) 94860
(2) Y29-42-S
(1) 94099
(3) Y117-416-C [C]
(3) Y14-416-T
(4) 95923
(1) 96334-1
(1) 96337-1
(1) 96335
(1) 96339
(1) Y325-32
(1) 95966
(1) Y186-50
(1) 95650
(1) 95659
(1) Y325-118
(2) Y325-202
[Mtl]
Item Description
[SS]
Track Gasket
166
[A]
167 Pilot Piston
[SS]
168 "O" Ring
(3/32" x 5/8" OD)
[D]
169 "U" Cup
(1/8" x 7/8" OD)
[SS]
170 Piston Sleeve
[D]
171 "O" Ring
(3/32" x 1-1/8" OD)
[SS]
172 "O" Ring
(1/16" x 1-1/8" OD)
[D]
173 "O" Ring
(1/16" x 1-3/8" OD)
[SS]
"O" Ring
[C/I]
(1/8" x 1/2" OD)
174
[SS]
176 Diaphragm
[B]
199 Track Gasket
200 Gasket
[SS]
201 Muffler
(includes item 127)
[SS]
Adapter Plate
233
[A]
(PM20S-X-X-BXX)
[SS]
240 Screw
(M6 x 1 - 6g x 16 mm)
[A]
241 Track Gasket
[SS]
242 "O" Ring
(1/16" x 7/32" OD)
[B]
243 "O" Ring
(1/8" x 5/8" OD)
[B]
244 "O" Ring
(1/8" x 7/8" OD)
[B]
[Ck]
Lubriplate FML-2 Grease
[Ck]
Lubriplate Grease, 10 Pack
Used on models PM20S-CSS-XXX-BXX only
[B]
Used on models PM20A-CSS-XXX-BXX only
Fluid Section Kit parts, see page 5.
[B]
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.
(Qty) Part No.
(size)
(1) 94026
(1) 67164
(includes 168 and 169)
(2) 94433
(1) Y240-9
(1) 94081
(1) Y325-119
(1) Y325-22
(2) Y325-26
(2) Y325-202
(2) 94102
(check valve)
(1) 95666
(1) 95665
(1) 67213
(1) 96336
(PM20A-X-X-BXX)
(1) 96338
(2) 95991
(1) 96344
(1) Y325-5
(1) Y325-204
(1) Y325-208
(1) 94276
637308
[Mtl]
[B]
[D]
[U]
[B]
[D]
[B]
[B]
[B]
[B]
[SP]
[B]
[B]
[A]
[SS]
[SS]
[B]
[B]
[B]
[B]
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