Repair Parts - Chamberlain LiftMaster Professional SW420 Installation Manual

Refer to the parts lists below for replacement parts available for
your operator. If optional modifications and/or accessories are
included with your operator, certain components may be added or
removed from these lists. Individual components of each kit may
Complete Electrical Panel Replacement Kits
To order a complete electrical box replacement kit, add a
K- prefix to the model number of your operator. For example:
SW420-33-11 (Operator) = K73SW420-33-11 (Electrical Box Kit)
Motor Kits
To order a motor replacement kit, add a K prefix to the number of
your motor and remove the second dash (-). For example:
20-5752-33 (Motor Number) = K20-575233 (Motor Kit)
INDIVIDUAL PARTS
ITEM PART# DESCRIPTION
1 74-18465 Housing Assembly
2 10-18462 Front Cover
3 10-G0326 Switch Box Cover
4 23-3001 DPST On/Off Switch
5 Conduit Box
6 65RSWD Pad Mount Kit
7 65RSWP Pedestal Mount Kit
8 76-G0564 Alarm Assembly
9 G802754 U-Bolt Nut
ARM ASSEMBLY KIT (K75-18362)
ITEM DESCRIPTION
A1 Arm (and Arm Extension)
A2 Arm Extension (and Arm)
A3 Arm Stop
A4 Arm Hub
A5 Gate Bracket
A6 Keyed 1" ID 1-1/4 1/8" FG
A7 Flanged Bushing
A8 Clevis Pin
A9 Latch Pin
A10 Hex Head Bolt 3/8-16x1"
A11 Hex Head Bolt 3/8-16x1-1/4"
A12 Hair Spring Cotter
R E P A I R P A R T S
not be available. Please consult a parts and service representative
regarding availability of individual components. Refer to page 36
for all repair part ordering information.
ITEM
E1
E2
E3
E4
E5
E6
E7
E8
E9
E10
QTY
E11
1
E12
1
E13
1
E14
1
E15
1
1
1
1
2
ITEM
D1
D2
D3
D4
QTY
D5
1
D6
1
D7
1
D8
1
D9
1
D10
1
D11
3
D12
1
D13
1
D14
1
D15
2
D16
1
D17
D18
D19
D20
D21
D22
D23
31
ELECTRICAL PANEL ASSEMBLY KIT
DESCRIPTION
Control Box Cover
Transformer 115V
Relay 24 Vac
Resistor With Mounting Bracket
Capacitor for 115V
Capacitor for 230V
Terminal Strip
Control Board, GL
Hinge Bracket
Control Box
Tie Wrap 14"
Aluminum Standoff
Nylon Standoff
Terminal Strip Insulator
Tinnerman Nut
Plastic Card Guide 6"
DRIVE ASSEMBLY KIT (K75-18363)
DESCRIPTION
Reducer Bracket
Bearing Bracket
Motor Plate
Switch Plate
Stiffener Plate
Drive Shaft
Keyed 1" ID 1-1/4" 1/8" Bushing
Flange Bearing 5/8" Bore
Sprocket, 40B11
Sprocket, 40B32
Motor Pulley
Chain #40 Pitch 47
Motor, 115V, 1/3 HP
Limit Switch N.C. SPST
Reducer 30:1
Limit Collar
Hall Effect Assembly
Roll Pin
Belt
Molded Pulley
Spacer
Washer
Phillips Screw 10-32x2-1/2"
QTY
1
1
3
1
1
1
1
1
2
1
2
1
2
2
5
1
QTY
1
1
1
1
1
1
3
1
1
1
1
1
1
2
1
1
1
2
1
1
1
7
1