LiftMaster K12-8032 4-Bolt Flanged Bearing 1-1/2 Inch
The LiftMaster K12-8032 is a 4-bolt flanged bearing with a 1-1/2 inch bore used on select LiftMaster industrial barrier gate operators, especially BG770 and BG790 applications. This bearing supports rotating shaft movement in the barrier arm drive assembly and helps keep the arm shaft aligned under repeated open and close cycles. A worn bearing can contribute to shaft play, noise, rough arm movement, uneven loading, or premature wear on nearby drive components. Because barrier gate operators place heavy load on the arm and linkage assembly, the bearing should be matched by part number, bore size, bolt pattern, and operator diagram before ordering. It is a mechanical service part, not a cure for electrical control issues.
For customer service and parts-counter work, this part should be treated as an exact-fit service component. The safest match is the part number on the original component, the operator model tag, and the LiftMaster parts diagram for that model. Similar LiftMaster parts can share the same general operator family but still differ by chip logic, thread direction, shaft size, mounting pattern, gearbox location, or generation.
Compatible With
This compatibility list is written from currently supportable product listings and service-part references. Always verify the installed operator and original part number before ordering.
- LiftMaster BG770 barrier gate operators
- LiftMaster BG790 barrier gate operators
- Barrier gate arm shaft assemblies using the 4-bolt 1-1/2 inch flanged bearing
- BG770/BG790 parts diagrams referencing K12-8032, 12-8032, 128032, or G128032
Features & Specifications
| Manufacturer | LiftMaster / Chamberlain Group |
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| Part Number | K12-8032 |
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| Product Type | Flanged Bearing |
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| Application | BG770 and BG790 barrier gate arm shaft support |
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| Compatible Operator Type | Commercial gate, barrier gate, or access operator application as listed below |
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| Notes | Match the original part number and operator parts diagram before ordering. |
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| Bore Size | 1-1/2 inch |
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| Mount Style | 4-bolt flanged mount |
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Also Known As / Related Part Numbers
- K12-8032
- 12-8032
- 128032
- G128032
- LM-K12-8032
- Flanged Bearing 4 Bolt 1-1/2
Technician Note
This part should be replaced only after the original component has been identified and the surrounding system has been inspected. For control chips, confirm the board is not damaged and that power, limits, accessory inputs, and safety wiring are not causing the fault. For mechanical or gearbox parts, inspect adjacent wear points before reassembly.
Before Ordering Checklist
- Match the original part number to K12-8032.
- Confirm the operator model and product family.
- Check the LiftMaster parts diagram for the exact installed unit.
- Compare any thread direction, size, mounting style, board marking, or gearbox location.
- Do not assume similar-looking LiftMaster parts are interchangeable.
Important Ordering Warnings
- Confirm 1-1/2 inch bore and 4-bolt mounting before ordering.
- Inspect shaft, sprockets, belts, and nearby linkage parts when replacing the bearing.
- Support the barrier arm safely before disassembly.
Professional Advisory
Gate and barrier operators can move with enough force to cause injury or property damage. Do not bypass safety devices during troubleshooting. If the repair involves control-board diagnosis, high-voltage circuits, heavy barrier arms, gearbox service, or unexpected operator movement, have the system inspected by a qualified gate technician.
Product Questions & Answers
What models commonly use K12-8032?
K12-8032 is commonly listed for LiftMaster BG770 and BG790 barrier gate operators.
What size is this bearing?
It is a 4-bolt flanged bearing with a 1-1/2 inch bore.
What are related part numbers for this bearing?
Related references include 12-8032, 128032, G128032, and LM-K12-8032.
What symptoms can point to a worn flanged bearing?
Shaft wobble, rough arm movement, grinding noise, or uneven mechanical loading can point to bearing wear.
Should other parts be inspected during replacement?
Yes. Inspect the shaft, keys, sprockets, belts, linkage, and counterweight system while the bearing area is open.
