Chamberlain LiftMaster Professional SW490, Addendum, Page: 2 / 6

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OPERATOR DIMENSIONS AND HORSEPOWER CHART
SW490 MOTORS
1/2 HP Motor
Maximum Gate Weight – 750 lbs. (340.2 kg)
Maximum Gate Width – 16 ft. (4.9 m)
3/4 HP Motor
Maximum Gate Weight – 900 lbs. (408.2 kg)
Maximum Gate Width – 19 ft. (5.8 m)
MOTOR PARTS
PART # DESCRIPTION
20-1050-1T Motor 115/230V TEFC 1PH, 1/2 HP
20-1075-1T Motor 115/230V TEFC 1PH, 3/4 HP
20-1075-1T Motor, 115/230V TEFC 3PH, 1/2 HP
20-3075B-4T Motor, 230/460V TEFC, 3PH, 3/4 HP
20-3050B-5T Motor, 575V TEFC, 3PH, 1/2 HP
INDIVIDUAL PARTS
10-18458 Side Plate Cover
10-2013 Mounting Bracket
73-18457 Frame Assembly
10-G0326 Switch Box Cover
23-3001 On/Off Switch, 20A
23-3005 On/Off Switch, 3PH
76-G0564 Alarm assembly
K001A5566 Control Board, GL
12-2002 Bearing 1-1/2"x1-3/4"
NOTE: All parts are specific to model of gate operator.
7.03"
(17.9 cm)
30.24"
(76.8 cm)
7.12"
(18.1 cm)
26.24"
(66.7 cm)
18.5"
(47 cm)
17.63"
(44.8 cm)
13.75"
(35 cm)
22"
(55.9 cm)
REPAIR PARTS - SW490 1/2 HP & 3/4 HP