LiftMaster K75-33948 MHS Disconnect Assembly Kit

The LiftMaster K75-33948 is the disconnect-assembly service kit identified in the documented MHS commercial-door operator parts arrangement. Match the exact operator and manual-disconnect configuration before ordering. This is a specific service assembly rather than a complete hoist, clutch shaft or general-purpose release conversion for every medium-duty operator. 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

Identify the Assembly and Plan the Repair

Inspect the disconnect mechanism, linkage and adjoining components before choosing a replacement assembly. Difficulty releasing or re-engaging the operator can involve wear, misalignment or door condition as well as the disconnect itself. Compare the actual mechanism with the correct MHS parts drawing rather than select from a generic release-kit photograph.

Door disconnect work must account for balance and support. Have a trained door technician secure the installation and follow the prescribed door position and release procedure before disturbing the mechanism. A new disconnect does not repair a damaged counterbalance system or make an unsupported door safe. Confirm current kit contents and verify manual operation, re-engagement and the operator’s required protection functions after repair.

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

Before Ordering

• Record the complete equipment model, serial information and installed service reference.
• Match the K75-33948 disconnect callout.
• Require their own explicit service recommendation.
• Separate assemblies with distinct repair scope.
• Confirm the current supplied inventory and exact installation and final testing instructions.

Package Contents and Separate Requirements

This offer identifies the disconnect assembly kit. Confirm current supplied linkage, retention and mounting pieces. A complete clutch shaft, output shaft, hand-hoist system, door counterbalance parts and operator are not established as included. Obtain separate worn components after checking the actual failure and service arrangement.

Safety Warnings — Read Before Installation or Service

• WARNING: A moving commercial door and exposed mhs disconnect assembly kit 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

• CPS-U monitored photo eyes — separate protection devices for approved commercial-door controls; match the operator and environment.
• TDC12X1BMC MAXUM trolley operator — a complete-operator comparison, not evidence that this legacy service part fits MAXUM.

Frequently Asked Questions

Is this a complete hand-hoist kit?

No full hoist package is established. It identifies the documented MHS disconnect assembly.

Will it fit every medium-duty model?

No universal fit is established. Match the exact model and current service recommendation.

Can it correct an unbalanced door?

No. A trained technician must assess and repair door and counterbalance faults separately.

What should be checked after service?

Verify the approved disconnect, manual operation and re-engagement behavior and all required operator safety functions.

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.