LiftMaster K109B0033 Link Connector / Trolley Belt Clip
LiftMaster K109B0033 Link Connector / Trolley Belt Clip
The LiftMaster K109B0033 is the one-piece link connector, also called a trolley belt clip, used to connect the belt and trolley on selected garage door opener rail assemblies. The manufacturer lists alternate references 109B33, 109B0033 and 109A22. Match the exact belt and trolley arrangement before ordering; this is a small connection component, not a roller-chain master link or complete trolley. Select the replacement by the complete part number and the installed equipment configuration. A similar photograph or a shared LiftMaster brand name does not establish interchangeability. Confirm the applicable service drawing before ordering so the repair addresses the correct component and its related mounting, connection and operating requirements.
Compatibility — Models, Versions and Exclusions
| Model or selection point | Compatibility requirement |
|---|---|
| Documented belt-drive rail | Use where the parts list identifies K109B0033. |
| Trolley attachment | Match the actual belt end and trolley interface. |
| Roller-chain master links | Different function and geometry; not an equivalent selection. |
| Complete trolley or tensioner | Separate service assemblies are not included by the clip reference. |
Identify the Assembly and Plan the Repair
A connector repair requires inspection of both the belt end and the trolley attachment. If either mating part is cracked, distorted or excessively worn, a new clip alone may not restore a reliable connection. Identify why the old connection failed before selecting the scope of repair.
The one-piece connector must be installed in the exact rail arrangement described by the opener instructions. Do not improvise a connection using chain links or a different clip that appears similar. Preserve the specified belt routing, retention and adjustment, then verify the opener’s travel and required safety functions after service.
Compare the replacement with the installed service arrangement before dismantling the equipment. Photograph the part’s location and record the complete model and visible service numbers. Inspect the surrounding attachment points and mating components for wear, impact damage or misalignment. Replacing one worn item will not correct a damaged support or another component that continues to impose abnormal loads on the repaired assembly.
Specifications and Product Identification
| Specification | Details |
|---|---|
| Ordering reference | K109B0033 |
| Component | One-piece link connector / trolley belt clip |
| Function | Connects belt to trolley in specified rail assemblies |
| Alternate references | 109B33, 109B0033, 109A22 |
| Selection requirement | Exact rail and trolley service match |
Before Ordering
- Record the complete opener and rail information.
- Match the K109B0033 or documented alternate reference.
- Inspect the belt end and trolley interface.
- Confirm the correct connector and approved rail setup procedure.
Package Contents and Separate Requirements
This offer identifies the one-piece link connector. A complete trolley, belt, tensioner, rail, master-link set and garage door opener are not established as included. Confirm the current connector package and obtain any damaged mating belt or trolley components separately.
Safety Warnings — Read Before Installation or Service
- WARNING: A moving commercial door and exposed link connector / trolley belt clip can cause serious injury or death. Have a trained door-systems technician perform installation and service.
- Disconnect mains power and any battery backup before mechanical work or wiring. Secure the door against unexpected movement as directed by its manufacturer.
- Do not work on springs, cables or counterbalance components without appropriate training. Never bypass safety sensors or increase force to overcome binding.
- Restore guards and complete the model-specific travel, reversal and protection-device tests before returning the door to normal operation.
Related Products and Important Differences
- 41A5434-11A seven-foot belt — a separate belt service option only where the exact rail and opener documentation specify it.
- 41B5424 belt pulley bracket — a separate rail-end assembly; its fit must be verified independently of this clip.
Frequently Asked Questions
Is it a roller-chain master link?
No. It is the documented belt-to-trolley connector for selected rail assemblies.
Does it include a complete trolley?
No complete trolley is identified by this small connector reference.
Are 109B33 and 109A22 related references?
The manufacturer lists those alternate numbers. Still confirm the exact opener and rail application.
Can it repair a damaged belt end?
Not by itself. Inspect both mating components and replace other damaged parts as required by the approved service arrangement.
Need Help Confirming the Right Product?
Contact Garage-DoorParts.com before ordering. Send the full equipment model, readable part labels and photographs of the installed assembly. Include the dimensions, electrical configuration or accessory details relevant to your project so the listing can be checked against the actual installation.
Details
Need Help With Compatibility?
Not sure if this is the correct part for your garage door, operator, gate system, or application? Contact Us before ordering — we’re happy to help.
Garage-DoorParts.com carries a large selection of residential and commercial parts, and many components can look similar while having important differences in dimensions, model numbers, voltage, mounting, or compatibility.
For the best assistance, please provide as much information as possible, including the manufacturer, model number, part number, door or operator type, dimensions, and clear photos of the existing part or equipment.
Our goal is to help you identify the correct product before you order and reduce the possibility of ordering an incompatible part.
Contact Us with your product questions and compatibility information, and we’ll do our best to point you in the right direction.
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