Liftmaster K75-33948 Disconnect Kit
The LiftMaster K75-33948 disconnect kit services the disconnect assembly area on compatible medium-duty hoist commercial door operators. This part of the operator allows the driven mechanism to be disengaged for manual operation or service access while maintaining the required interlock relationship in the operator.
This kit is associated with LiftMaster MH commercial hoist operators and appears in MHS slow-speed hoist parts references as the disconnect assembly. Since LiftMaster uses several disconnect kits across commercial door and gate operator families, the number matters. A disconnect kit from an SL slide gate operator, GH gearhead operator, or industrial H/J/HJ operator should not be substituted just because the name sounds similar.
What This Part Does
- Replaces the disconnect assembly components on compatible MH/MHS hoist operators.
- Supports proper manual disconnect function when matched and installed correctly.
- Helps restore worn, damaged, or incomplete disconnect hardware in the hoist operator frame.
Compatible With
Known compatibility and application references found during this review include:
- LiftMaster MH medium-duty hoist commercial door operators where the parts diagram calls for K75-33948.
- LiftMaster MHS slow-speed hoist commercial door operators where K75-33948 is listed as the disconnect assembly.
- Select medium-duty hoist applications only when the exact operator parts breakdown confirms the kit.
- Not a replacement for K75-30737, K75-37549, H/J/HJ disconnect kits, or gate operator disconnect kits unless the diagram specifically lists K75-33948.
Also Known As / Related Part Numbers
Use these references during parts comparison:
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Disconnect kit |
| Part Number | K75-33948 |
| Application | Manual disconnect assembly repair |
| Compatible Operator Type | Select MH and MHS medium-duty hoist commercial door operators |
| Related Operator Families | MH, MHS where supported by diagram |
| Safety Function | Works with manual disconnect/interlock system where applicable |
| Notes | Do not substitute with disconnect kits from other commercial operator families. |
Technician Note
After replacing disconnect hardware, test the manual disconnect and electrical interlock function. The operator should not run in an unsafe disconnected condition.
Before Ordering
- Confirm the parts diagram calls for K75-33948.
- Verify the operator family is MH or MHS, not H, J, HJ, GH, or SL.
- Inspect the release chain, handle, interlock switch, and related brackets.
- Test manual operation and re-engagement after installation.
- Do not bypass the disconnect interlock to force operation.
Professional Advisory
Manual disconnect and interlock components are safety-related on commercial door operators. A qualified technician should install and test the kit before returning the door to service.
Product Questions
What does K75-33948 repair?
It repairs the disconnect assembly area on compatible LiftMaster medium-duty hoist operators.
Is this for MH or MHS operators?
References show MH commercial hoist compatibility, and an MHS parts diagram also lists K75-33948 as a disconnect assembly. Match the exact operator diagram before ordering.
Can I use this on a slide gate operator?
No. Similar disconnect kit names exist for gate operators, but K75-33948 should not be substituted for SL595 or other gate operator disconnect kits.
Why is the interlock important?
The interlock helps prevent unsafe powered operation when the operator is in a disconnected or manual mode.
Should the disconnect be tested after installation?
Yes. Manual release, re-engagement, and interlock operation should be tested before the operator is returned to service.
