LiftMaster K72-33258 Limit Shaft and Sprocket Kit
The LiftMaster K72-33258 limit shaft and sprocket kit is used in the limit system of select commercial door operators. The limit assembly is what helps the operator know where to stop at the fully open and fully closed positions.
This kit is specifically tied to commercial operator electrical-box applications equipped with Logic 5.0 and NEMA 4 or NEMA 4X style configurations. Those configurations can use different limit hardware than standard electrical-box models, so matching by model family alone is not enough.
If the operator overruns, stops short, loses limit position, or has damaged limit hardware, this kit may be part of the repair path. The final match should come from the LiftMaster parts diagram and the original component number.
Compatible With / Common Applications
Commonly listed for select LiftMaster commercial door operator electrical boxes equipped with Logic 5.0 and NEMA 4 or NEMA 4X configurations.
- Select LiftMaster Logic 5.0 commercial door operators with NEMA 4 electrical box builds
- Select LiftMaster Logic 5.0 commercial door operators with NEMA 4X electrical box builds
- Commercial operator limit systems where the parts diagram lists K72-33258
- Damp-environment or watertight electrical-box applications only when this exact kit is called out
- Not a substitute for K72-10047, K72-10047-1, K72-33192, or other limit shaft kits unless confirmed by diagram
- Not used as a general residential garage door opener limit kit
Features and Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Limit shaft and sprocket kit |
| Part Number | K72-33258 |
| Application | Commercial door operator limit system |
| Control Platform | Logic 5.0 |
| Enclosure Type | NEMA 4 / NEMA 4X applications where listed |
| Function | Transfers limit movement for open and close stopping positions |
| Notes | Limits must be reset/tested after replacement |
Also Known As / Related Part Numbers
- K72-33258
- 72-33258
- LiftMaster limit shaft and sprocket kit
- K72-10047 - related limit shaft assembly, not automatically interchangeable
- K72-10047-1 - related limit switch shaft kit, not automatically interchangeable
- K72-33192 - related damp-environment limit shaft kit reference, verify before substituting
Technician Note
After replacing limit shaft components, the open and close limits must be checked and adjusted. Never rely on the old limit position after mechanical limit hardware has been replaced.
Before Ordering Checklist
- Confirm the operator uses Logic 5.0 with a NEMA 4 or NEMA 4X electrical-box configuration
- Confirm the parts diagram calls for K72-33258
- Inspect the sprocket, chain, limit nuts, switch assembly, and shaft alignment
- Reset and test open and close limits after installation
- Test monitored safety devices and door reversing response after service
Professional Advisory
Limit system repairs can affect where the commercial door stops. A qualified commercial door technician should install and adjust this kit, then test the door, brake, limits, controls, and safety devices before returning the operator to service.
Product Questions and Answers
What does the K72-33258 kit do?
It replaces limit shaft and sprocket components used to transfer movement in the operator limit system.
Is this for all Logic 5 operators?
No. It is commonly listed for select Logic 5.0 NEMA 4 or NEMA 4X commercial operator applications where the parts diagram calls for K72-33258.
Can I use K72-10047 instead?
Do not substitute limit shaft kits by appearance. K72-10047 and K72-33258 are different service paths unless a parts diagram specifically allows the change.
Will the limits need adjustment after replacement?
Yes. Open and close limits should be reset and tested after replacing limit shaft or sprocket components.
Is this a residential opener part?
No. This is a commercial door operator limit component, not a standard residential garage door opener part.
