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6662AX-X-C
3
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 other parts that may not be needed to service this model.
Item
Description (size)
Qty
Part No.
[Mtl]
Item
Description (size)
Qty
Part No.
[Mtl]
101 Motor Body
(6662AX-XXX-C)
(1)
94744
[A]
116 Spacer
(1)
92006
[Z]
(6662BX-XXX-C)
(1)
94742
[CI]
3
117 Gasket
(1)
92004
[B/NY]
3
102 O” Ring
(1/16” x 11/4” o.d.)
(2)
Y325-24
[B]
118 Pilot Rod
(1)
93309-2
[C]
103 Sleeve
(1)
94528
[D]
3
119 “O” Ring
(1/8” x 3/4” o.d.)
(4)
93075
[U]
3
104 Retaining Ring, TruArc
(1-5/32” i.d.)
(2)
Y145-26
[C]
120 Spacer
(3)
115959
[Z]
105 Screw
(1/4”-20 x 5/8”)
(8)
Y6-42-T
[SS]
121 Sleeve Bushing
(2)
98723-2
[Bz]
106 Lockwasher
(1/4”)
(8)
Y14-416-T
[SS]
3
122 “O” Ring
(3/32” x 9/16” o.d.)
(2)
94820
[U]
107 Plate
(2)
93707-1
[SS]
3
123 Screw
(#8-32 x 3/8”)
(4)
Y154-41
[C]
3
108 Gasket
(with notch)
(1)
92878
[B/NY]
126 Pipe Plug
(1/2 14 N.P.T. x 17/32”)
(1)
Y227-5-L
[C]
109 Piston
(1)
92011
[D]
127 90
0
Street Elbow
(3/4 14 N.P.T.)
(1)
Y43-5-C
[C]
3
110 “U” Cup
(3/16” x 13/8” o.d.)
(1)
Y186-51
[B]
128 Pipe Plug
(1/8-27 N.P.T. x 1/4”)
(1)
Y227-2-L
[C]
111 Spool
(6662AX-XXX-C)
(1)
92005
[A]
195 Button Head Screw
(1/4”-20 x 1/4”)
(3)
94987
[SS]
(6662BX-XXX-C)
(1)
93047
[C]
201 Muffl
er
(1)
93139
[P]
112 Washer
(1.557” o.d.)
(5)
92877
[Z]
231 Pipe Plug
(6662BX-X only)
(2)
Y17-51-S
[SS]
3
113 “O” Ring
(small) (1/8” x 1-1/4” o.d.)
(5)
Y325-214
[B]
3
Key-Lube “O” Ring Lubricant
(1)
93706-1
3
114 “O” Ring
(large) (3/32” x 1-9/16” o.d.)
(6)
Y325-126
[B]
Key-Lube Packets (10)
637175
115 Spacer
(4)
92876
[Z]
PARTS LIST / 6662AX-X-C AIR MOTOR SECTION
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.
Do not overtighten fasteners, refer to torque specifi cation
block on view.
Re-torque fasteners following restart.
y
y
y
y
y
y
PILOT VALVE DISASSEMBLY
Remove (104) retaining ring.
Remove (123) screws and (122) “O” rings.
Remove (118) piston 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 bushings etc. and re-
tain on each end with the two (122) “O” rings, retain with
(123) screws.
Replace (104) retaining rings.
1.
2.
3.
4.
MATERIAL CODE
[A] = Aluminum
[CI] = Cast Iron
[SS] = Stainless Steel
[B] = Nitrile
[D] = Acetal
[U] = Polyurethane
[Bz] = Bronze
[NY] = Nylon
[Z] = Zinc
[C] = Carbon Steel
[P] = Polypropylene
MAJOR VALVE DISASSEMBLY
Remove (107) plate (or leg depending on model), (108
and 117) gaskets.
On the side opposite the air inlet, push on the inner di-
ameter (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.
1.
2.
3.
MAJOR VALVE REASSEMBLY
Replace (112) washer, (114) “O” ring and (113) “O” ring
onto (115) spacer and insert etc.
NOTE: Be careful to orient spacer legs away from
blocking internal ports.
2. Lubricate and carefully insert (111) spool.
3. Install (117) gasket and (107).
4. Lubricate and install (110) packing cup and insert (109)
piston into (air inlet side) cavity, the (110) packing cup
lips should point outward.
5. Install (108) gasket and replace (107).
1.
