Product Description
The LiftMaster 144B18 pulley is an idler pulley replacement commonly referenced as K144B0018. It is used on select LiftMaster opener rail assemblies where the parts diagram calls for this specific 2 inch outside diameter pulley.
Compatibility and Application
Compatible with LiftMaster ATS211 and ATS211R garage door opener applications where K144B0018, 144B0018, or 144B18 is listed. Confirm the pulley diameter, bore, and mounting setup before using it on older or similar-looking rail assemblies.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Chamberlain |
| Product Type | Idler pulley |
| Part Number | K144B0018 |
| Application | Garage door opener rail pulley replacement |
| Compatible Operator Type | Select ATS211 and ATS211R garage door openers |
| Dimensions | 2 in. outside diameter, 1/2 in. bore |
| Notes | Match pulley size and rail application before ordering |
Also Known As / Related Part Numbers
- K144B0018
- 144B0018
- 144B18
- Idler pulley
- LiftMaster pulley
Technician Note
A worn pulley can create noise, rough travel, or belt/rail tracking issues. If the old pulley is damaged, check surrounding rail hardware and belt alignment before putting the opener back in service.
Before Ordering
- Confirm the opener model is ATS211, ATS211R, or another model that lists K144B0018.
- Compare the old pulley to the 2 in. outside diameter and 1/2 in. bore reference.
- Inspect the pulley shaft, rail bracket, and belt/rail alignment.
- Check for excessive tension or binding that may have damaged the original pulley.
- Do not substitute a different pulley size unless the parts diagram supports it.
Professional Advisory
Do not operate the opener with a seized pulley, frayed belt, or unstable rail hardware. If the door or rail binds during travel, have the door and opener inspected before continued use.
Product Questions & Answers
What size is the LiftMaster K144B0018 pulley?
Current LiftMaster references list it as a 2 inch outside diameter idler pulley with a 1/2 inch bore.
Which models commonly use 144B18?
LiftMaster lists K144B0018 for ATS211 and ATS211R garage door opener applications.
Is 144B18 a universal LiftMaster pulley?
No. Pulley diameter, bore size, and mounting style vary, so it should be matched by part number and model.
What problems can a worn idler pulley cause?
A worn or seized pulley can cause noise, rough travel, belt tracking problems, or added strain on the opener rail assembly.
Should I replace other parts with the pulley?
Inspect the belt, rail bracket, pulley shaft, and surrounding hardware. Replace only the parts that are worn or called for by the service diagram.
