144B0042 144B42 28T Motor Pulley for Screw Drive Openers
The LiftMaster 144B0042 pulley transfers motor rotation through the belt/pulley system on select screw drive garage door openers. A worn or damaged pulley can cause slipping, belt wear, vibration, noise, or poor transfer of power from the motor to the screw drive mechanism. Because this part has a specific outside diameter, bore, and tooth count, choosing a pulley by approximate size is risky. A pulley that is close but not exact can damage the belt, create alignment problems, or overload the drive system. Match the original pulley number and verify the opener model before ordering.
Compatible With
For select LiftMaster and Chamberlain screw drive garage door openers that specify 144B0042 or 144B42. Manufacturer references describe it as a 2 inch OD, 1/2 inch B motor pulley for various screw drive openers. Additional catalog references commonly associate 144B0042 / 144B42 with older screw-drive models including 1000SD, 1000SDR, 2000SD, and 2000SDR. Verify by original pulley and parts diagram before ordering.
Features and Specifications
| Manufacturer | LiftMaster / Chamberlain Group |
| Product Type | Motor pulley |
| Part Number | 144B0042 |
| Application | Motor pulley replacement for screw drive opener power transfer |
| Compatible Operator Type | Select screw drive residential garage door openers |
| Teeth | 28T reference |
| Dimensions | 2 inch outside diameter; 1/2 inch B reference |
| Notes | Match original pulley and belt system |
Also Known As / Related Part Numbers
- 144B0042
- 144B42
- LiftMaster 144B0042
- LiftMaster 144B42
- 08B-144B42
- 28T pulley
- 28 tooth motor pulley
- 2 inch OD 1/2 inch B pulley
- Screw drive motor pulley
Technician Note
When a pulley is worn, also inspect the belt, motor shaft, set screw area, and rail drive components. A new pulley can be damaged quickly if the belt is misaligned or another drive component is binding.
Before Ordering Checklist
- Match the original pulley number to 144B0042 or 144B42.
- Confirm the opener is a compatible screw drive model.
- Verify the 28T, 2 inch OD, and 1/2 inch B reference against the old pulley.
- Inspect the belt for wear or missing teeth before reusing it.
- Do not use this as a universal pulley for other opener types or gate operators.
Professional Advisory
A noisy or slipping screw drive system can involve the belt, pulley, motor shaft, rail, or trolley. Correct the cause of the wear before replacing only the pulley.
Important Ordering Warnings
- Not for standard belt-drive or chain-drive rail systems.
- Do not substitute a pulley with similar diameter but different tooth count, bore, or belt profile.
Product Questions and Answers
What is the LiftMaster 144B0042 pulley used for?
It is a motor pulley for select LiftMaster and Chamberlain screw drive garage door openers.
Is 144B0042 the same as 144B42?
Yes. LiftMaster lists 144B42 as an also-known-as reference for 144B0042.
What are the key pulley specifications?
Manufacturer references identify it as a 2 inch outside diameter, 1/2 inch B motor pulley, commonly searched as a 28T pulley.
Which older models are commonly associated with it?
Some catalog references associate it with older screw drive models such as 1000SD, 1000SDR, 2000SD, and 2000SDR.
Can this pulley be used on belt-drive openers?
No. It is identified for screw drive opener applications and should not be used as a universal pulley.
