Liftmaster K91-G0122, LIMIT COLLAR
The LiftMaster K91-G0122 is a replacement limit collar used in compatible LiftMaster gate operator limit assemblies. The collar secures to a limit shaft or adjustment area and helps maintain the mechanical position used by the operator to recognize open and close travel points.
A worn or loose limit collar can cause inconsistent stopping, limit drift, overtravel, repeated adjustment loss, or mechanical contact with nearby limit components. Correct fitment matters because different operator families can use different limit shafts, collars, set screws, and adjustment hardware. This part should be verified against the diagram for the exact operator model and generation.
Compatible With
Compatibility references are mixed, so this part should be treated as diagram-confirmed. Documented and commonly associated applications include:
- LiftMaster BG790 barrier gate operator limit collar references
- LiftMaster HS670 industrial slide gate operator references
- HS670GL and related industrial operator references in some listings
- Various LiftMaster residential and commercial gate operators where K91-G0122 is listed
- Limit shaft assemblies that call out K91-G0122, 91-G0122, or G91-G0122
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Limit Collar |
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| Part Number | K91-G0122 |
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| Application | Limit shaft adjustment / limit mechanism positioning |
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| Compatible Operator Type | Select barrier, slide, residential, and commercial gate operators |
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| Common Model References | BG790, HS670, HS670GL where diagram-confirmed |
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| Notes | Mixed listing references require parts-diagram confirmation |
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Also Known As / Related Part Numbers
- K91-G0122
- 91-G0122
- G91-G0122
- Limit collar
- Limit shaft collar
Technician Note
After replacing a limit collar, the gate travel usually needs to be checked and adjusted according to the operator manual. If the collar keeps slipping, inspect the shaft, set screw, threads, and vibration source before returning the operator to service.
Before Ordering
- Confirm the exact operator model and generation
- Verify K91-G0122 or 91-G0122 in the parts diagram
- Inspect the limit shaft for wear or damage
- Check set screws, threads, and collar seating surface
- Plan to recheck open and close limits after replacement
Professional Advisory
Limit adjustments affect gate travel and stopping position. Incorrect adjustment can cause overtravel, impact, or unsafe movement. Use a qualified gate technician if the limit system or gate travel is not operating correctly.
Important Ordering Warning
Supplier listings connect this part to both BG790 and HS670-style applications. Do not order by model name alone; confirm the part number in the diagram.
Product Questions
What does the K91-G0122 limit collar control?
It helps secure the limit adjustment or limit shaft position so the operator stops at the correct open and close travel points.
Why are BG790 and HS670 both mentioned?
Different supplier references list different applications. Because of that, fitment should be confirmed by parts diagram and original part number.
Can a bad limit collar cause overtravel?
Yes. If the collar slips or no longer holds position, the operator may lose consistent limit settings.
Will limits need adjustment after replacement?
Usually yes. Travel and limit operation should be checked after the collar is replaced.
Is this a universal collar for all LiftMaster gates?
No. It is for select limit assemblies where K91-G0122 or a related number is specified.
