Liftmaster K07-8063, UPPER CRANK
The LiftMaster K07-8063 upper crank is a mechanical replacement part for the barrier arm linkage area of compatible LiftMaster barrier gate operators. In a barrier gate system, the crank hardware is part of the motion-transfer assembly that converts drive movement into controlled arm travel. A worn, bent, or loose upper crank can cause uneven arm movement, noisy operation, binding in the linkage, or extra stress on the drive mechanism. Replacing the crank with the correct OEM-style part helps restore proper arm geometry and keeps the operator linkage working in line with the factory parts layout. This is not an electrical control part and it does not change operator speed, logic, or safety settings. Fitment should be confirmed against the BG790 parts diagram, especially if the operator has had previous linkage repairs or non-original hardware installed.
Compatible With
- LiftMaster BG790 barrier gate operators
- Select LiftMaster barrier arm gate operator systems where K07-8063 is shown in the parts diagram
- Perimeter access barrier gate systems using the K07-8063 upper crank linkage component
Compatibility should be verified by the original part number, operator model, and LiftMaster parts diagram. Similar-looking gate and access-control parts may not be interchangeable across model generations.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster / Chamberlain Group |
| Product Type | Upper crank / barrier arm linkage part |
| Part Number | K07-8063 |
| Application | Barrier gate operator crank linkage repair |
| Compatible Operator Type | Barrier arm gate operators |
| Common Model Reference | BG790 |
| Related Parts to Inspect | Lower crank K07-8064, crank link, linkage hardware, bushings, and mounting fasteners |
| Notes | Match by original part number and operator parts diagram before ordering |
Also Known As / Related Part Numbers
- K07-8063
- 07-8063
- 078063
- G078063
- LiftMaster K07-8063
- LIF-K07-8063
Related numbers are included to help with part lookup and cross-reference searches. Do not treat a related number as a direct replacement unless it matches the original parts diagram for your equipment.
Technician Note
Before replacing this part, inspect the surrounding hardware and the reason the original part failed. Bent brackets, worn bushings, loose fasteners, water intrusion, damaged covers, gate bind, or incorrect previous repairs can cause repeat failures even after the correct replacement part is installed.
Before Ordering
- Confirm the manufacturer part number on the original part or parts diagram.
- Verify the exact operator, keypad, telephone entry, or access-control model.
- Compare mounting points, cover shape, length, handedness, and related hardware where applicable.
- Check whether companion parts are damaged or missing.
- Do not bypass required safety devices or modify factory safety-related assemblies.
Professional Advisory
Gate and commercial operator parts can involve heavy moving assemblies, stored mechanical force, and high-voltage wiring. If the system has unsafe movement, missing safety devices, damaged wiring, or alignment problems, have the equipment inspected by a qualified gate or commercial door technician before returning it to service.
Product Questions & Answers
What operator is the K07-8063 upper crank commonly used with?
K07-8063 is most commonly associated with the LiftMaster BG790 barrier gate operator and related barrier arm operator parts diagrams.
Is K07-8063 the same as the lower crank?
No. K07-8063 is the upper crank. The lower crank is a different part, commonly referenced as K07-8064, and the two should not be swapped.
When should this upper crank be replaced?
It is commonly replaced when the crank is bent, cracked, worn at the mounting hole, causing linkage bind, or no longer keeping the barrier arm linkage aligned.
Should other linkage parts be inspected during replacement?
Yes. Inspect the lower crank, crank link, bushings, bolts, and barrier arm hardware so a worn companion part does not damage the new crank.
Does this part affect electrical programming or safety settings?
No. This is a mechanical linkage part. Electrical controls, limit setup, and safety devices should still be checked according to the operator manual after any mechanical repair.
