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670053-X-X (en)
PARTS LIST / 670053-X-X AIR SECTION
Indicates parts included in 637118-C Air Section Service Kit.
SERVICE KIT NOTE: Service Kit 637118-C is a general repair kit for all 1” and larger ARO diaphragm pump air motors. It
contains extra “O” Rings and extra parts that may not be needed to service this model.
MATERIAL CODE
[A] = Aluminum
[C] = Carbon Steel
[SS] = Stainless Steel
[B] = Nitrile
[D] = Acetal
[U] = Polyurethane
[Bz] = Bronze
[Ny] = Nylon
[�] = �inc
[Ny] = Nylon
[�] = �inc
[Ny] = Nylon
[�] = �inc
[P] = Polypropylene/
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
repair.
Inspect and replace old parts with new parts as neces-
sary. Look for deep scratches on metallic surfaces, and
nicks or cuts in “O” rings.
Take precautions to prevent cutting “O” rings upon instal-
lation.
Lubricate “O” rings with Key-Lube grease or equivalent.
Do not over-tighten fasteners. Refer to torque specifica-
tion block on view.
Make sure to torque all fasteners following restart.
PILOT VALVE DISASSEMBLY
Remove (104) retaining ring.
Remove (123) screws and (122) “O” rings.
Remove (118) pilot rod, (121) sleeve bushing, (119) “O”
rings and (120) spacers from the (101) motor body.
Remove (103) sleeve and (102) “O” rings.
1.
2.
3.
4.
PILOT VALVE REASSEMBLY
Replace two (102) “O” rings, if worn or damaged, and rein-
stall (103) sleeve.
Install one of the (121) sleeve bushings, (119) “O” rings,
(120) spacers and the remaining (121) bushing.
Carefully push (118) pilot rod into bushing etc. and retain
on each end with the two (122) “O” rings. Retain with
(123) screws.
Replace (104) retaining rings.
MAJOR VALVE DISASSEMBLY
Remove (107) plate and (108 and 117) gaskets.
On the side opposite the air inlet, push on the inner di-
ameter of (111) spool. This will force the (109) piston out.
Continue pushing the (111) spool and remove. Check for
scratches and gouges.
Reach into the air section (exhaust side) and remove
(116) spacer, (115) spacers, (113) “O” rings, (114) “O” rings,
(112) washers, etc. Check for damaged “O” rings.
MAJOR VALVE REASSEMBLY
Replace (112) washer, (114) “O” ring and (113) “O” ring
onto (115) spacer and insert etc. NOTE: Be careful to ori-
ent spacer legs away from blocking internal ports.
Lubricate and carefully insert (111) spool.
Install (117) gasket and (107) plate.
Lubricate and install (110) packing cup and insert (109)
piston into (air inlet side) cavity, the (110) packing cup
lips should point outward.
Install (108) gasket and replace (107) plate.
1.
2.
3.
4.
1.
2.
3.
1.
2.
3.
4.
5.
Item Description
(size)
(Qty) Part No.
[Mtl]
101 Motor Body
(1) 94744
[A]
102 “O” Ring
(1/16” x 1-1/4” o.d.)
(2) Y325-24
[B]
103 Sleeve
(1) 94528
[D]
104 Retaining Ring, TruArc
(1-5/32 i.d.)
(2) Y145-26
[C]
105 Screw / Washer
(1/4” - 20 x 5/8”)
(8) 93860
[C]
107 Plate
(2) 93707-1
[SS]
108 Gasket
(with notch)
(1) 92878
[B/Ny]
109 Piston
(1) 92011
[D]
110 “U” Cup
(3/16” x 1-3/8” o.d.)
(1) Y186-51
[B]
111 Spool
(1) 92005
[A]
112 Washer
(1.556” o.d.)
(5) 92877
[Z]
113 “O” Ring
(small) (1/8” x 1-1/4” o.d.)
(5) Y325-214
[B]
114 “O” Ring
(large)
(3/32” x 1-9/16” o.d.)
(6) Y325-126
[B]
115 Spacer
(4) 92876
[Z]
116 Spacer
(1) 92006
[Z]
Item Description
(size)
(Qty) Part No.
[Mtl]
117 Gasket
(1) 92004
[B/Ny]
118 Pilot Rod
(1) 93309-2
[C]
119 “O” Ring
(1/8” x 3/4” o.d.)
(4) 93075
[U]
120 Spacer
(3) 115959
[Z]
121 Sleeve Bushing
(2) 98723-2
[Bz]
122 “O” Ring
(3/32” x 9/16” o.d.)
(2) 94820
[U]
123 Screw
(#8 - 32 x 3/8”)
(4) Y154-41
[C]
126 Pipe Plug
(1/2 - 14 PTF x 17/32”)
(1) Y227-5-L
[C]
127 90° Street Elbow
(3/4 - 14 NPT)
(1) Y43-5-C
[C]
128 Pipe Plug
(1/8 - 27 PTF x 1/4”)
(1) Y227-2-L
[C]
195 Button Head Screw
(1/4” - 20 x 1/4”)
(2) 94987
[SS]
198 Button Head Screw
(1/4” - 20 x 3/8”)
(1) 94987-1
[SS]
201 Muffler
(1) 350-568
[C]
Key-Lube “O” Ring Lubricant
(1) 93706-1
Key-Lube, 10 Pack
(10) 637175