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6661AX-X-CPAGE 6OF8
PARTS LIST / 6661AX-X-C AIR MOTOR SECTION
n 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.
ITEM DESCRIPTION (Sizein inches) Qty Part No. [Mtl] ITEM DESCRIPTION (Size ininches) Qty Part No. [Mtl]
101 Motor Body (6661AX-XXX-C) (1) 94743 [A]
(6661BX-XXX-C) (1) 94741 [CI]
n102 “O” Ring (1/16” x 1” o.d.) (2) Y325-20 [B]
V103 Sleeve (1) 94527 [D]
n104 Retaining Ring, TruArc (.925”i.d.) (2) Y145-25 [C]
105 Screw (1/4” - 20 x 5/8”) (8) Y6-42-T [SS]
106 Lock Washer (1/4”) (8) Y14-416-T [SS]
107 Plate (2) 93707-1 [SS]
n108 Gasket (with notch) (1) 92878 [B/Ny]
V109 Piston (1) 92011 [D]
n110 “U” Cup (3/16”x 1-3/8” o.d.) (1) Y186-51 [B]
V111 Spool (6661AX-XXX-C) (1) 92005 [A]
(6661BX-XXX-C) (1) 93047 [C]
V112 Washer(1.557” o.d.) (5) 92877 [Z]
n113 “O” Ring (1/8” x 1-1/4” o.d.) (5) Y325-214 [B]
n114 “O” Ring (3/32” x 1-9/16” o.d.) (6) Y325-126 [B]
V115 Spacer (4) 92876 [Z]
V116 Spacer (1) 92006 [Z]
n117 Gasket (1) 92004 [B/Ny]
118 Pilot Rod (1) 93309-1 [C]
n119 “O” Ring (1/8” x 3/4”o.d.) (4) 93075 [U]
120 Spacer (3) 115959 [Z]
121 Sleeve Bushing (2) 98723-1 [Bz]
n122 “O” Ring (3/32” x 9/16” o.d.) (2) 94820 [U]
n123 Screw (#8-32x3/8”) (4) Y154-41 [C]
124 Screw (5/16” -18 x 2-3/8”) (12) 93277 [SS]
128 Pipe Plug (1/8 -27 N.P.T.x 1/4”) (1) Y227-2-L [C]
195 Button Head Screw (1/4” -20 x 1/4”) (3) 94987 [SS]
201 Muffler (1) 93110 [C]
n Key-Lube “O” Ring Lubricant (1) 93706-1
Pak of 10 Key-Lube (10) 637175
n
ServiceKitsinclude:Y212-101(2)Screws(#10-32x1/4”)usedonunits
manufactured between 8/90and 4/92 toretain the pilot bushing.
AIR MOTOR SECTION SERVICE
Service is divided into two parts - 1. Pilot Valve, 2. Major Valve.
GENERAL REASSEMBLY NOTES:
S Air Motor Section Service is continued from Fluid Section repair.
S Inspect andreplace oldparts withnew partsas necessary.Look for
deep scratches on metallicsurfaces, and nicks or cuts in “O” rings.
S Take precautions to prevent cutting “O” rings upon installation.
S Lubricate “O” rings with Key-Lube grease.
S Do notover-tighten fasteners,refer to torquespecification blockon
view.
S 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) sleevebushing, (119)“O” ringsand
(120) spacers from the (101) motor body.
4. Remove (103) sleeve and (102) “O” rings.
PILOT VALV E REASSEMBLY
1. Replace two (102) “O” ringsif worn or damaged and reinstall (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 retain 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 [P] = Polypropylene
[B] = Nitrile [D] = Acetal [U]= Polyurethane
[Bz] = Bronze [N]= Neoprene [SS]= Stainless Steel
[C] = CarbonSteel [Ny] = Nylon [Z] = Zinc
MAJOR VALVE DISASSEMBLY
1. Remove (107) plate (or leg depending on model), (108 and 117)
gaskets.
2. On the side opposite the air inlet, push on the inner diameter (111)
spool.Thiswillforcethe(109)pistonout.Continuepushingthe(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 carefulto orient spacer legsaway from blocking in-
ternal 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
(airinletside)cavity,the(110)packingcuplipsshouldpointoutward.
5. Install (108) gasket and replace (107).
V “SmartParts”
K
eep theseitems on hand inaddition to the Service
K
its forfast repairand reduction of down time.