LiftMaster K72-34818 Limit Shaft Kit - SL575, SL585 and SL595 Slide Gate Operators
The LiftMaster K72-34818 is a limit shaft replacement kit for select SL-series commercial slide gate operators. The limit shaft is part of the mechanical travel tracking system. As the operator runs, the shaft and limit nuts work with the limit switches to stop the gate at the programmed open and close positions. If the shaft threads wear, nuts bind, bearings loosen, or the limit sprocket is damaged, the operator may lose accurate stopping points.
This is a fitment-sensitive kit because SL575, SL585, and SL595 operators have multiple generations and suffixes. Some references list it broadly for various LiftMaster slide gate operators, while others list SL575, SL585, and SL595 style applications. Use the parts diagram to verify the correct shaft kit before ordering.
Compatible With
- LiftMaster SL575 slide gate operators where K72-34818 is listed
- LiftMaster SL585 / SL585GL / SL585U / SL585UL style applications where confirmed
- LiftMaster SL595 / SL595GL / SL595U / SL595UL style applications where confirmed
- Select LiftMaster commercial slide gate operators requiring the K72-34818 limit shaft kit
- Not an automatic substitute for other K72 limit shaft kits with different shaft lengths or hardware
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Limit shaft kit |
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| Part Number | K72-34818 |
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| Application | Mechanical travel limit service |
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| Compatible Operator Type | Commercial slide gate operators |
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| Compatible Models | SL575, SL585, SL595 style applications where listed |
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| Included Components | May include limit shaft, limit nuts, bearings, sprocket, washers, compression ring, roll pin, and E-ring depending on kit supply |
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| Notes | Limits must be reset after replacement |
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Also Known As / Related Part Numbers
- K72-34818
- 72-34818
- LM-K72-34818
- SL575 limit shaft kit
- SL585 limit shaft kit
- SL595 limit shaft kit
Technician Note
Limit shaft wear often shows up as repeated limit adjustments, gate overtravel, or inconsistent stopping. Inspect limit nuts, limit switches, sprocket, chain, and wiring while the operator is open.
Before Ordering
- Verify the exact SL model and suffix.
- Confirm K72-34818 in the parts diagram.
- Inspect limit switches and wiring before replacing only the mechanical kit.
- Set and test open and close limits after installation.
- Test monitored entrapment protection and safety devices before returning the gate to service.
Professional Advisory
Limit systems affect where the gate stops. Do not bypass limit switches or safety devices to compensate for worn limit shaft hardware.
Product Questions and Answers
What does the K72-34818 limit shaft kit do?
It supports the mechanical limit system that controls where the slide gate operator stops in the open and close directions.
What models is K72-34818 commonly associated with?
It is commonly associated with select SL575, SL585, and SL595 slide gate operator applications.
Can worn limit shaft hardware cause overtravel?
Yes. Worn threads, loose bearings, damaged nuts, or a slipping sprocket can cause inaccurate stopping.
Does this kit include limit switches?
The kit is a limit shaft hardware kit; verify the supplied contents if switches are needed separately.
Do limits need adjustment after replacement?
Yes. Open and close travel limits must be reset and tested after the kit is installed.
