PF20R-X-BPage 6 of 8
PARTS LIST / PF20X-X-X -B AIR SECTION
nIndicatesparts 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 CenterBody (1) 95667 [P]
103 Bushing (1) 94092 [D]
105 Screw(M6x1-6gx180mm) (4) 95921 [SS]
107 EndPlate (2) 95846 [SS]
111 Spool (1) 95651 [D]
118 ActuatorPin (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]
n132 Gasket (1) 94099 [B]
133 Washer(M6) (8) 95931 [SS]
134 Screw(M6x1-6gx35mm) (8) 95923 [SS]
135 ValveBlock (1) 95789 [P]
136 EndCap (1) 95790 [P]
n137 “O”Ring (1/16” x 2” o.d.) (1) Y325-32 [B]
n138 “U”Cup (3/16” x 1.792” o.d.) (1) 95966 [B]
n139 “U”Cup (3/16” x 1-1/4” o.d.) (1) Y186-50 [B]
140 ValveInsert (1) 95650 [Ck]
141 ValvePlate (1) 95659 [Ck]
n166 TrackGasket (1) 94026 [B]
n167 PilotPiston (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 PistonSleeve (1) 94081 [Br]
n171 “O”Ring (3/32” x 1-1/8” o.d.) (1) Y325-119 [B]
n172 “O”Ring (1/16” x 1-1/8” o.d.) (1) Y325-22 [B]
n173 “O”Ring (1/16” x 1-3/8” o.d.) (2) Y325-26 [B]
Kn174 “O” Ring (1/8” x 1/2” o.d.) (2) Y325-202 [B]
n176 Diaphragm(check valve) (2) 94102 [SP]
n199 TrackGasket (1) 95666 [B]
n200 Gasket (1) 95665 [B]
~201 Muffler (1) 94810
n232 “O”Ring (1/8” x 1/2” o.d.) (2) Y325-202 [B]
233 AdapterPlate (1) 95761 [P]
236 Nut(M6x1-6g) (4) 95924 [SS]
n243 “O”Ring (1/8” x 5/8” o.d.) (1) Y325-204 [B]
n244 “O”Ring (1/8” x 7/8” o.d.) (1) Y325-208 [B]
Ln LubriplateFML-2 Grease (1) 94276
LubriplateGrease Packets (10) 637308
~Itemsnot shown
MATERIALCODE
[B]= Nitrile [D]= Acetal [SP] = Santoprene
[Br]= Brass [I] = Iron [SS]= Stainless Steel
[C]= CarbonSteel [P]= Polypropylene [U]= Polyurethane
[Ck]= Ceramic
KFluidSection Service Kit parts, see page 4.
AIR MOTOR SECTION SERVICE
Serviceis divided into two parts - 1. Pilot Valve, 2. Major Valve.
GENERALREASSEMBLY NOTES:
SAirMotor Section Service is continued from Fluid Section repair.
SInspectand replace old parts with new parts as necessary. Look for
deepscratches on surfaces, and nicks or cuts in “O” rings.
STakeprecautions to prevent cutting “O” rings upon installation.
SLubricate“O” rings with Lubriplate FML-2 grease.
SDonot over-tighten fasteners, refer to torque specification block on
view.
SRe-torquefasteners following restart.
SSERVICETOOLS --To aid in the installation of (168) “O” rings onto
the(167) pilot piston, use tool # 204130-T, available from ARO.
PILOT VALVEDISASSEMBLY
1. Alight tap on (118) should expose the opposite (121) sleeve, (167)
pilotpiston and other parts.
2. Remove(170) sleeve, inspect inner bore of sleeve for damage.
PILOT VALVEREASSEMBLY
1. Cleanand lubricate parts not being replaced from service kit.
2. Installnew (171 and 172) “O” rings, replace (170) sleeve.
3. Installnew (168) “O” rings and (169) seal - Note the lip direction. Lu-
bricateand replace (167).
4. Reassembleremaining parts, replace (173 and 174) “O” rings.
MAJOR VALVEDISASSEMBLY
1. Remove(135) valve block and (233) adapter plate, exposing (132
and166) gaskets, (232) “O” ring and (176) checks.
2. Remove (233) adapter plate, releasing (140) valve insert, (141)
valveplate, (199 and 200) gaskets and (232, 243 and244) “O” rings.
3. Remove(136) end cap and (137) “O” ring, releasing (111) spool.
MAJOR VALVEREASSEMBLY
1. Install new (138 and 139) “U” cups on (111)spool -- LIPS MUST
FACEEACH 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) valve insert and (141) valve plate into (135) valve block.
NOTE:Assemble (140) valve insert with “dished” side toward (141)
valveplate. 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(132 and 166) gaskets, (176) checks and (232) “O” ring to
(101)body.
7. Assemble(135) valve block and components to (101) body, secur-
ingwith (134) screws.
V“SmartParts”
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eepthese items on hand in addition to the service kits
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astrepair and reduction o
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