Chamberlain 4600 4620 4640 9902 Screw Drive


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The right replacement part for your Chamberlain model 4600, 4620, 4640 or 9902 screw drive garage door opener will take less time to find with our illustrated parts diagrams at North Shore Commercial Door. Just click on the number next to the picture of the part you want, and place your order. We have Chamberlain-compatible LiftMaster replacement capacitors, line cords and capacitor brackets.

Our parts replacements include limit switch assemblies, motor drive assemblies, pulleys and mini drive belts designed to be compatible with your Chamberlain screw drive garage door operator. If you don't see the part you need for your garage door operator, just call, email or Live Chat our in-house parts experts to help you find it. With our bargain prices on easy-install DIY replacement parts , you won't have to invest in an expensive new garage door opener if all you need to do is replace a part or two. We can process and ship most parts the next business day.

Key Part # Description
1 31D426 Liftmaster 31D426 Drive Shaft Cover
2 41B4245 Liftmaster 41B4245 Line cord
3 30B363 Liftmaster 30B363 Garage Door Opener Capacitor
4 12A373 Liftmaster 12A373 Capacitor bracket
5 41A3150 Liftmaster 41A3150 Terminal block w/ screws
6 41D4671 Liftmaster 41D4671 Limit Switch Assembly
7 12D554 Limit Switch Bracket N/A
8 41D4759 Complete Motor Drive Assembly N/A
8A 144B41 Liftmaster 144B41 22T Pulley
8B 144B42 Liftmaster 144B42 28T Pulley
8C 20C14 Liftmaster Chamberlain 20C14 Garage Door Opener Mini Drive Belt
8D 158A69 Liftmaster 158A69 Retainer Ring
9 41A4843 Interrupter Cup N/A
10 41A4837 Liftmaster 41A4837-1 Worm Gear and Retainer
11 41C4669 Liftmaster 41C4669 Wire Harness
12 41C4672 Liftmaster 41C4672 Screw Drive RPM Sensor Kit
13 41D4674-2C Receiver Logic Board Assembly for 4600 (390 MHz)
41D4674-14G Receiver Logic Board Assembly for 4620, 4640, and 9902 (MHz)
14 41C4840-2 Control center acces door for all other models N/A
15 175C121 Light Socket N/A
16 108D47 Light Lens N/A