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AD40A-X-XPage 6 of 8
PARTS LIST / AD40A-X -X AIR MOTOR SECTION
n Indicates parts included in 637436 Air Section Service Kit.
SERVICEKITNOTE: ServiceKit 637436is ageneralrepair kitfor all1” and largerARO diaphragmpumpair motors.It contains extra“O”
rings and extra parts t hat 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 (1) 94744 [A]
n102 “O” Ring (1/16” x 1 -1/4” o.d.) (2) Y325-24 [B]
V 103 Sleeve (1) 94528 [D]
n104 Retaining Ring, TruArc (1-5/32” i.d.) (2) Y145-26 [C]
105 Screw/Wshr (1/4”-20 x 5/8”) (AD40A-XXP-) (8) 93860 [C]
Cap Screw (1/4”-20 x 5/8”) (AD40A-XXS-) (8) Y6-42-T [SS]
106 Lockwasher (1/4”) (AD40A- XXS-) (8) Y14-416-T [SS]
107 Plate (2) 93707-1 [SS]
n108 Gasket (with notch) (1) 92878 [B/Ny]
V 109 Piston (1) 92011 [D]
n110 “U” Cup (3/16” x 1-3/8” o.d.) (1) Y186-51 [B]
V 111 Spool (1) 92005 [A]
V 112 Washer (1.557” o.d.) (5) 92877 [Z]
n113 “O” Ring (small) (1/8” x 1-1/4” o.d.) (5) Y325-214 [B]
n114 “O” Ring (large) (3/32” x 1-9/16” o.d.) (6) Y325-126 [B]
V 115 Spacer (4) 92876 [Z]
V 116 Spacer (1) 92006 [Z]
n117 Gasket (1) 92004 [B/Ny]
118 Pilot Rod (1) 93309-2 [C]
n119 “O” Ring (1/8” x 3/4” o.d.) (4) 93075 [U]
120 Spacer (3) 115959 [Z]
121 Sleeve Bushing (2) 98723-2 [Bz]
n122 “O” Ring (3/32” x 9/16” o.d.) (2) 94820 [U]
n123 Screw (#8-32x3/8”) (4) Y154-41 [C]
126 Pipe Plug (1/2 -14 P.T.F. x 17/32”) (1) Y227-5-L [C]
127 90_ Street Elbow (3/4 - 14 N.P.T.) (1) Y43-5-C [C]
128 Pipe Plug (1 /8 - 2 7 P.T.F. x 1/4”) (1) Y227-2-L [C]
133 Lockwasher (1/4”) (1) Y14-416-T [SS]
197 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) 93139 [P]
n Key-Lube “O” Ring Lubricant (1) 93706-1
10 Pak of Key-Lube 637175
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 and replace old parts with new parts as necessary. Look for
deep scratches on metallic surfaces, 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 not over-tighten fasteners, refer to torque specification block on
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) 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 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.
n Parts Y145-25 (0.925” i.d.) (qty 2) retaining rings and Y325-20 “O” rings
(qty 2) are included in the service kit for the repair of smaller pumps.
MATERIAL CODE
[A] = Aluminum [D] = Acetal [U] = Polyurethane
[B] = Nitrile [Ny] = Nylon [SS] = Stainless Steel
[Bz] = Bronze [P] = Polypropylene [Z] = Zinc
[C] = Carbon Steel
MAJOR VALVE DISASSEMBLY
1. Remove (107) plate (or leg depending on model), (108 and 117)
gaskets.
2. On theside oppositethe air inlet, push on the inner diameter of(111)
spool. This willforce the(109)piston out.Continue pushingthe (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 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
(air inletside) cavity, the (110) packingcup lipsshould pointoutward.
5. Install (108) gasket and replace (107).
V “Smart Parts”
K
eep these items on hand in addition to the Service
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ast repair and reduction o
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