Repair Parts - Chamberlain LiftMaster Professional SW420 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 not be available. Please consult a
parts and service representative regarding availability of individual components. Refer to page 35 for all repair part ordering information.
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
74-18465 HOUSING ASSY
1
10-18462 FRONT COVER
2
10-2709 HINGE BRACKET
3
SWITCH BOX COVER
4 10-G0326
DPST ON/OFF TAG
5 23-3001
6 28-G0518 CONDUIT BOX
65-RSW-D PAD MOUNT KIT
7
65-RSW-P PEDESTAL MT. KIT
8
76-G0564 ALARM ASSY
9
U-BOLT NUT
10 80-2754
8-35 X 5/8" SELF TAP SCREW
11 82-PX08-10T
12 K001A5566 REPLACEMENT GL BOARD
ARM ASSEMBLY KIT (K75-18362)
ITEM DESCRIPTION
A1 ARM
A2 ARM EXT.
A3 ARM STOP
A4 ARM HUB
A5 GATE BRACKET
A6 1"ID KEYED 1-1/4 1/8" FG
A7 FLANGED BUSHING
A8 CLEVIS PIN
A9 LATCH PIN
A10 3/8-16 X 1" H.H. BOLT
A11 3/8-16 X 1-1/4 H.H.
A12 HAIR SPRING COTTER
R E P A I R P A R T S
ITEM
E1
E2
E3
E4
E5
E6
E7
E8
E9
E10
E11
QTY E12
E13
1
E14
1
E15
2
E16
1
1
1
1
1
ITEM
1
2 D1
2 D2
D3
1
D4
D5
D6
D7
QTY
D8
D9
1
D10
1
D11
1
D12
1
D13
1
D14
1
D15
3
D16
1
D17
1
D18
1
D19
2
D20
1
D21
D22
D23
29
ELECTRICAL PANEL ASSEMBLY KIT
DESCRIPTION
HINGE BRACKET
ELECTRICAL BOX
ELECTRICAL BOX COVER
115V TRANSFORMER
24Vac RELAY
14" TYE WRAP
RESISTOR W/MTG. BRACKET
CAPACITOR
ALUMINUM STANDOFF
NYLON STANDOFF
TERMINAL STRIP INSULATOR
TERMINAL STRIP
TERMINAL STRIP
GL PCB ASSY
TINNERMAN NUT
6" PLASTIC CARD GUIDE
DRIVE ASSEMBLY KIT (K75-18363)
DESCRIPTION
REDUCER BRACKET
BEARING BRACKET
MOTOR PLATE
SWITCH PLATE
STIFFENER PLATE
DRIVE SHAFT
1'ID KEYED 1-1/4 1/8"
FLANGED BEARING
40B11 SPROCKET
40B32 SPROCKET
MOTOR PULLEY
#40 CHAIN 47 PITCH
MOTOR, 1/3HP 115Vac 1000 RPM
LIMIT SWITCH N.C. SPST
30:1 REDUCER
LIMIT COLLAR
HALL EFFECT ASSY
SPACER
WASHER
10-32 X 2-1/2 PHILLIP SCREW
ROLL PIN
BELT
MOLDED PULLEY
QTY
2
1
1
1
3
2
1
1
1
2
2
1
1
1
5
1
QTY
1
1
1
1
1
1
3
1
1
1
1
1
1
2
1
1
1
2
7
1
2
1
1