LiftMaster K72-34844 Output Shaft Kit - SL575 Slide Gate Operators
The LiftMaster K72-34844 is an output shaft kit used to service the final drive area of select LiftMaster gate operators. The output shaft carries the operator drive load and works with sprockets, keys, spacers, and retaining hardware to transfer motion to the gate drive chain or related mechanism. If the output shaft or its hardware is worn, the operator may run without moving the gate properly, may slip under load, or may show uneven chain and sprocket wear.
Several sources list this kit for various LiftMaster residential and commercial gate operator systems, while specific parts listings identify SL575 applications. Because output shaft kits are highly dependent on shaft dimensions, sprocket layout, and hardware stack-up, this part should be confirmed by parts diagram before ordering.
Compatible With
- LiftMaster SL575 slide gate operators where K72-34844 is listed
- Select LiftMaster residential and commercial gate operators where the parts diagram lists K72-34844
- SL-series slide gate operator drive assemblies using this output shaft kit
- Not automatically interchangeable with other SL585, SL595, RSL, CSL, or CSW output shaft kits unless confirmed by the parts diagram
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Output shaft kit |
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| Part Number | K72-34844 |
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| Application | Gate operator final drive / output shaft service |
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| Compatible Operator Type | Select slide gate and gate operator applications |
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| Compatible Models | SL575 and other listed applications where confirmed |
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| Included Components | Output shaft, sprockets, E-ring, washer, key, set screw, roll pin, spacer, or related kit hardware depending on supply |
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| Notes | Match shaft dimensions and sprocket arrangement before ordering |
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Also Known As / Related Part Numbers
- K72-34844
- 72-34844
- LM-K72-34844
- SL575 output shaft kit
- LiftMaster output shaft kit
Technician Note
Output shaft wear is often caused by heavy gate load, chain misalignment, damaged sprockets, loose keys, or poor gate rolling condition. Correct the cause of the wear before installing the new shaft kit.
Before Ordering
- Confirm K72-34844 in the operator parts diagram.
- Check shaft length, sprocket position, keyway, and spacer arrangement.
- Inspect chain, sprockets, bearings, and gate rollers at the same time.
- Verify the gate moves freely by hand when disconnected.
- Retest chain alignment, limits, and safety devices after repair.
Professional Advisory
Final drive repairs should be completed with the gate secured and power disconnected. Heavy slide gates can move unexpectedly if the drive system is disassembled without proper support.
Product Questions and Answers
What does the K72-34844 output shaft kit replace?
It replaces the output shaft and related final-drive hardware on select LiftMaster gate operators.
Is K72-34844 for SL575 operators?
Yes, strong references list this kit for SL575 slide gate operator applications.
Can this kit stop chain slipping?
It can help if slipping is caused by worn output shaft hardware, keys, sprockets, or loose retaining parts.
Does this fit every SL-series operator?
No. Similar SL-series operators can use different output shaft kits, so the parts diagram must be checked.
Should the gate be checked for binding?
Yes. A binding or heavy gate can damage the new shaft kit if the root problem is not corrected.
