ARO PM20 Series Operator's Manual - Page 8

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ARO PM20 Series Operator's Manual
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 identification toward (140) valve insert.
140
135
133
134
MAJOR
VALVE
)TORQUE REQUIREMENTS(
NOTE: DONOT OVERTIGHTEN FASTENERS.
ALL FASTENERS ARE METRIC.
Torque (105) Screw to 40 - 50 in. lbs (4.5 - 5.6 Nm).
Torque (134) Screw to 40 - 50 in. lbs (4.5 - 5.6 Nm).
Torque (240) Screw to 40 - 50 in. lbs (4.5 - 5.6 Nm).
LUBRICATION / SEALANTS
Apply Lubriplate FML-2 grease to "O" rings, "U" Cups
and mating parts.
Apply Loctite 271 to threads at assembly.
A replacement Major Valve Service Assembly is available separately, which includes the following:
637374-2 for models PM20A-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 for models PM20S-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, 243 and 244.
Page 8 of 12
PARTS LIST / PM20X-X-X-BXX AIR MOTOR SECTION
118
121
174
173
167
199
244
243
233
141
200
241
128
138
111
139
137
242
128
136
105
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).
169
168
172
171
170
132
166
240
176
127
MATERIAL CODE
[A] = Aluminum
[B] = Nitrile
[C] = Carbon Steel
[Ck] = Ceramic
[D] = Acetal
[I] =
Iron
[SP] = Santoprene
[SS] = Stainless Steel
[U] = Polyurethane
Figure 3
PILOT VALVE
PART GROUP
126
173
121
118
174
103
101
Optional 9411
Mu er
Substitute these "O" rings for
"166" gasket on models
PM20S-CSS-XXX-BXX.
147
146
PM20X-X-X-BXX (en)
201