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66607X-X-A (en)
PARTS LIST / 6660XX-X-X-A AIR MOTOR 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 3/4" and larger ARO diaphragm pump air motors . It contains extra “O” Rings and
other parts that may not be needed to service this model .
AIR MOTOR PARTS LIST
Item
Description
(size)
Qty Part No .
[Mtl]
101 Motor Body
(1) 94743
[A]
102 “O” Ring
(1/16" x 1" OD)
(2) Y325-20
[B]
103 Sleeve
(1) 94527
[D]
104 Retaining Ring, TruArc
(0 .925" ID)
(2) Y145-25
[C]
105 Screw/Washer
(1/4"-20 x 5/8") (6660X0)
(8) 93860
[C]
Cap Screw
(1/4"-20 x 5/8") (6660XA)
(8) Y6-42-T
[SS]
106 Lockwasher
(1/4") (6660XA)
(8) Y14-416-T [SS]
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" OD)
(1) Y186-51
[B]
111 Spool
(1) 92005
[A]
112 Washer
(1 .557" OD)
(5) 92877
[Z]
113 “O” Ring
(1/8" x 1-1/4" OD)
(5) Y325-214
[B]
114 “O” Ring
(3/32" x 1-9/16" OD)
(6) Y325-126
[B]
115 Spacer
(4) 92876
[Z]
116 Spacer
(1) 92006
[Z]
117 Gasket
(1) 92004
[B/Ny]
AIR MOTOR PARTS LIST
Item
Description
(size)
Qty Part No .
[Mtl]
118 Pilot Rod
(1) 93309-1
[C]
119 “O” Ring
(1/8" x 3/4" OD)
(4) 93075
[U]
120 Spacer
(3) 115959
[Z]
121 Sleeve Bushing
(2) 98723-1
[Bz]
122 “O” Ring
(3/32" x 9/16" OD)
(2) 94820
[U]
123 Screw
(#8 - 32 x 3/8")
(4) Y154-41
[C]
124 Stud
(5/16" - 18 x 1-3/4") (6660X0)
(16) 92866
[C]
(5/16" - 18 x 1-3/4") (6660XA)
(16) 92866-1
[SS]
128 Pipe Plug
(1/8 - 27 NPT x 1/4")
(1) Y227-2-L
[C]
195A Button Head Screw
(1/4" - 20 x 1/4")
(2) 94987
[SS]
195B Button Head Screw
(1/4" - 20 x 3/8"
)
(1) 94987-1
[SS]
201 Muffler
(1) 93110
[C]
Key-Lube “O” Ring Lubricant
(1) 93706-1
Pack of 10 Key-Lube
637175
Parts Y145-26 (1.156" ID) (qty 2) retaining rings and Y325-24 “O” rings (qty 2) are
included in the service Kit for the repair of larger pumps.
“Smart Parts” Keep these items on hand in addition to the Service Kits for fast
repair and reduction of down time.
AIR MOTOR SECTION SERVICE
Service is divided into two parts − 1 . Pilot Valve, 2 . Major
Valve . GENERAL REASSEMBLY NOTES:
y
Air Motor Section Service is continued from Fluid Section
repair.
y
Inspect and replace old parts with new parts as necessary.
Look for deep scratches on metallic surfaces, and nicks or
cuts in “O” rings.
y
Take precautions to prevent cutting “O” rings upon instal-
lation.
y
Lubricate “O” rings with Key-Lube grease.
y
Do not over tighten fasteners, refer to torque specification
block on view.
y
Re-torque fasteners following restart.
PILOT VALVE DISASSEMBLY
1. Remove (104) retaining ring.
2. Remove (123) screws and (122) “O” rings.
3. Remove (118) piston rod, (121) sleeve bushing, (119) “O”
rings and (120) spacers from the (101) motor body.
4. Remove (103) sleeve and (102) “O” rings.
PILOT VALVE REASSEMBLY
1. Replace two (102) “O” rings if worn or damaged and rein-
stall (103) sleeve.
2. Install one of the (121) sleeve bushings, (119) “O” rings,
(120) spacers and the remaining (121) bushing.
3. Carefully push (118) pilot rod into bushings etc. and re-
tain on each end with the two (122) “O” rings, retain with
(123) screws.
4. Replace (104) retaining rings.
MATERIAL CODE
[A] = Aluminum
[CI] = Cast Iron
[U] = Polyurethane
[B] = Nitrile
[D] = Acetal
[Z] = Zinc
[Bz] = Bronze
[NY] = Nylon
[C] = Carbon Steel [SS] = Stainless Steel
MAJOR VALVE DISASSEMBLY
1. Remove (107) plate and (108 and 117) gaskets.
2. 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.
3. 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
1. 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) plate.
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 (107) plate.
