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PF20R-X-BPage 6 of 8
PARTS LIST / PF20X-X-X-B AIR SECTION
n Indicates parts included in 637369 Air Section Service Kit shown below and items (70), (144), (175), (180) shown on page 4.
AIR MOTOR PARTS
Item Description (size) Qty Part No. [Mtl] Item Description (size) Qty Part No. [Mtl]
101 Center Body (1) 95667 [P]
103 Bushing (1) 94092 [D]
105 Screw (M6x1-6gx180mm) (4) 95921 [SS]
107 End Plate (2) 95846 [SS]
111 Spool (1) 95651 [D]
118 Actuator Pin (0.250” x 2.276” long) (2) 94083 [SS]
121 Sleeve (2) 94084 [D]
~ 127 90_ St. Elbow (1-1/2 - 11-1/2 N.P.T.) (1) 94860 [C / I ]
n 132 Gasket (1) 94099 [B]
133 Washer (M6) (8) 95931 [SS]
134 Screw (M6x1-6gx35mm) (8) 95923 [SS]
135 Valve Block (1) 95789 [P]
136 End Cap (1) 95790 [P]
n 137 “O” Ring (1/16” x 2” o.d.) (1) Y325-32 [B]
n 138 “U” Cup (3/16” x 1.792” o.d.) (1) 95966 [B]
n 139 “U” Cup (3/16” x 1-1/4” o.d.) (1) Y186-50 [B]
140 Valve Insert (1) 95650 [Ck]
141 Valve Plate (1) 95659 [Ck]
n 166 Track Gasket (1) 94026 [B]
n 167 Pilot Piston (includes 168 and 169) (1) 67164 [D]
168 “O” Ring (3/32” x 5/8” o.d.) (2) 94433 [U]
169 “U” Cup (1/8” x 7/8” o.d.) (1) Y240-9 [B]
170 Piston Sleeve (1) 94081 [Br]
n 171 “O” Ring (3/32” x 1-1/8” o .d.) (1) Y325-119 [B]
n 172 “O” Ring (1/16” x 1-1/8” o .d.) (1) Y325-22 [B]
n 173 “O” Ring (1/16” x 1-3/8” o .d.) (2) Y325-26 [B]
Kn 174 “O” Ring (1/8” x 1/2” o.d.) (2) Y325-202 [B]
n 176 Diaphragm (check valve) (2) 94102 [SP]
n 199 Track Gasket (1) 95666 [B]
n 200 Gasket (1) 95665 [B]
~ 201 Muffler (1) 94810
n 232 “O” Ring (1/8” x 1/2” o.d.) (2) Y325-202 [B]
233 Adapter Plate (1) 95761 [P]
236 Nut (M6x1-6g) (4) 95924 [SS]
n 243 “O” Ring (1/8” x 5/8” o.d.) (1) Y325-204 [B]
n 244 “O” Ring (1/8” x 7/8” o.d.) (1) Y325-208 [B]
Ln Lubriplate FML-2 Grease (1) 94276
Lubriplate Grease Packets (10) 637308
~ Items not shown
MATERIAL CODE
[B] = Nitrile [D] = Acetal [SP] = Santoprene
[Br] = Brass [I] = Iron [SS] = Stainless Steel
[C] = Carbon Steel [P] = Polypropylene [U] = Polyurethane
[Ck] = Ceramic
K Fluid Section Service Kit parts, see page 4.
AIR MOTOR SECTION SERVICE
Service is divided into two parts - 1. Pilot Valve, 2. Major Valve.
GENERAL REASSEMBLY NOTES:
S Air Motor Section Service is continued from Fluid Section repair.
S Inspect and replace old parts with new parts as necessary. Look for
deep scratches on surfaces, and nicks or cuts in “O” rings.
S Take precautions to prevent cutting “O” rings upon installation.
S Lubricate “O” rings with Lubriplate FML-2 grease.
S Do not over-tighten fasteners, refer to torque specification block on
view.
S Re-torque fasteners following restart.
S SERVICE 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 direction. Lu-
bricate and replace (167).
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, (232) “O” ring and (176) checks.
2. Remove (233) adapter plate, releasing (140) valve insert, (141)
valve plate,(199 and 200)gaskets and(232,243 and244) “O”rings.
3. Remove (136) end cap 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 block.
3. Install (137) “O” ring on (136) end cap and assemble end cap to
(135) valve block, securing with (107) end plates and (105) screws.
4. Install (140)valveinsert and (141) valveplate into (135) valveblock.
NOTE: Assemble (140) valve insert with “dished” side toward (141)
valve plate. Assemble (141) valve plate with 2 identification dots to-
ward (199 and 200) gaskets.
5. Assemble (232, 243 and 244) “O” rings, (199 and 200) gaskets and
(233) adapter plate to (135) valve block.
6. Assemble (132and 166) gaskets,(176) checks and(232) “O” ringto
(101) body.
7. Assemble (135) valve block and components to (101) body, secur-
ing with (134) screws.
V “Smart Parts”
K
eep these items on hand in addition to the service kits
f
or
f
ast repair and reduction o
f
down time.