Liftmaster K72-33858 Clutch Shaft Kit
The LiftMaster K72-33858 clutch shaft kit is a replacement assembly for the clutch and drive section of select MHS medium-duty hoist commercial door operators. The MHS is the slow-speed hoist operator family used on rolling sheet doors and similar commercial door applications where the operator parts diagram identifies the K72-33858 clutch shaft kit.
Unlike an individual shaft, this kit is intended to address a larger portion of the clutch shaft assembly. Depending on the service package, references show the kit with the clutch shaft, clutch plate or disc components, chain guide, release holder, belt, pulley, clutch spring, disconnect spring, bushings, bearings, washers, nuts, cotter pin, roll pin, and e-rings. Because kit contents can vary by source or production generation, compare the received kit to the LiftMaster parts breakdown before installation.
What This Part Does
- Rebuilds the clutch shaft area on compatible MHS commercial hoist operators.
- Replaces multiple wear components around the shaft instead of only the shaft itself.
- Helps restore clutch engagement, drive alignment, and hoist operator mechanical operation when matched correctly.
Compatible With
Known compatibility and application references found during this review include:
- LiftMaster MHS medium-duty hoist commercial door operators.
- MHS5011U / MHS slow-speed hoist operator references where the parts diagram calls for K72-33858.
- Commercial slow-speed hoist operator applications for rolling sheet doors where the clutch shaft kit is listed as K2 in the MHS parts breakdown.
- Not a direct replacement for MH clutch shaft 11-10987, MH clutch shaft kit K72-33841, H clutch shaft 11-19471, H kit K72-19979, or HJ shaft 11-19473 unless the diagram says so.
Also Known As / Related Part Numbers
Use these references to compare labels, older listings, and supplier catalogs:
- K72-33858
- LIF-K72-33858
- OCGSLM-K72-33858
- LiftMaster K72-33858 clutch shaft kit
- MHS clutch shaft assembly replacement kit
- Related but separate: K72-33856 output shaft kit, K72-33841 MH clutch shaft kit, 11-10987 MH clutch shaft
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Clutch shaft kit |
| Part Number | K72-33858 |
| Application | MHS clutch/drive assembly repair |
| Compatible Operator Type | MHS medium-duty slow-speed hoist commercial door operators |
| Common Kit Contents | Clutch shaft, disc/plate components, guide, release holder, belt, pulley, springs, bushings, bearings, washers, nuts, pins, and retaining hardware where supplied |
| Related Operator Family | MHS |
| Notes | Kit contents and compatibility should be verified by parts diagram before installation. |
Technician Note
If the operator has clutch slip, noise, or uneven drive engagement, inspect the door balance and drive chain condition before replacing the kit. A binding door can damage new clutch parts quickly.
Before Ordering
- Confirm the operator is an MHS model, not standard MH.
- Confirm the parts diagram calls for K72-33858.
- Compare kit contents to the parts breakdown before disassembly.
- Inspect related output shaft, chain, sprockets, bearings, and disconnect parts while open.
- Do not reuse worn hardware if new retaining hardware is supplied in the kit.
Professional Advisory
Commercial hoist operator clutch repairs involve moving mechanical parts and stored door weight. Secure the door, disconnect power, and use a qualified door technician if the system cannot be safely held and tested.
Product Questions
What model family uses K72-33858?
K72-33858 is tied to LiftMaster MHS medium-duty hoist commercial door operators.
Is this the same as 11-10987?
No. 11-10987 is an MH clutch shaft reference. K72-33858 is a clutch shaft kit associated with MHS operators.
What may be included in the kit?
References show clutch shaft components, disc or plate parts, chain guide, release holder, belt, pulley, springs, bushings, bearings, washers, nuts, pins, and retaining hardware. Contents should be checked against the parts diagram.
Can this fix a slipping clutch?
It can help when the clutch shaft assembly is worn, but door balance, clutch adjustment, drive chain condition, and other worn parts should be inspected too.
Can this be used on H or HJ industrial operators?
Do not assume that. H and HJ industrial operators use different shaft and kit references.
