Product Information
The LiftMaster 109B33 is a trolley belt clip, also known as a link connector, used to connect the belt and trolley on select belt-drive garage door opener rail assemblies. It is a small but important rail component because the belt-to-trolley connection is what transfers opener movement to the door. This part should be matched to the rail assembly and parts diagram before ordering.
Compatibility and Application
This part is used on select LiftMaster and Chamberlain belt-drive garage door opener rail assemblies. Compatibility should be verified by the rail assembly or opener parts diagram, not by opener brand alone.
Use Notes
- Connects the belt to the trolley on compatible rail systems.
- Common repair item when the original connector breaks or is lost.
- Not a complete belt, rail, trolley, or motor repair kit.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Trolley Belt Clip / Link Connector |
| Part Number | 109B33 |
| Related Part Number | K109B0033 |
| Application | Belt-to-trolley connection on select belt-drive rail assemblies |
| Compatible Operator Type | Select LiftMaster and Chamberlain belt-drive garage door openers |
| Notes | Rail and belt design must match the replacement part |
Also Known As / Related Part Numbers
- 109B33
- K109B0033
- 109B0033
- 109A22
- LiftMaster belt clip
- Trolley belt clip
Technician Note
If the opener runs but the trolley does not move properly, inspect the belt teeth, belt splice, trolley, and rail hardware. A broken clip may be only one part of the problem.
Before Ordering
- Confirm the opener or rail parts diagram lists 109B33 or K109B0033.
- Check whether the belt, trolley, and rail are still in usable condition.
- Compare the old clip style before ordering.
- Do not use this part on chain-drive or screw-drive opener rails.
Professional Advisory
Disconnect power before working on the opener rail. If the door is heavy, out of balance, or the rail hardware is damaged, correct the door system issue before replacing small rail components.
Product Q&A
What is the LiftMaster 109B33 used for?
The 109B33 is a trolley belt clip or link connector used to connect the belt to the trolley on select belt-drive garage door openers.
Is K109B0033 the same part as 109B33?
K109B0033 is the LiftMaster replacement part listing commonly associated with 109B33, 109B0033, and 109A22.
Does this fit all LiftMaster belt-drive openers?
No. Belt rail hardware varies by opener and rail assembly. Match the part number to the rail or opener parts diagram.
When should the trolley belt clip be replaced?
Replace it if the clip is broken, missing, worn, or no longer holds the belt connection securely to the trolley.
Can this fix a stripped or broken belt?
Only if the belt and trolley are otherwise usable. If the belt teeth, splice area, or trolley assembly are damaged, additional parts may be needed.
