LiftMaster K75-18620 Limit Box Kit for SL595 and SL595GL Slide Gate Operators
The LiftMaster K75-18620 is a complete external limit box service kit used on compatible SL595-series industrial slide gate operators. The limit box is not just a cover or small switch holder; it is the mechanical and electrical assembly that keeps the operator limit system properly mounted, aligned, and adjustable. On an older SL595 or SL595GL operator, a worn limit box can cause inconsistent stopping, limit drift, broken adjustment hardware, damaged wiring terminals, or an operator that cannot be set accurately after service.
This kit is most commonly ordered when the original external limit box has weather damage, cracked or missing enclosure parts, worn limit shaft hardware, missing springs or retainers, or when multiple small limit-box parts are too worn to repair individually. Because SL595 operators have had different configurations over time, the safest way to verify this kit is to compare K75-18620 to the illustrated parts list for the exact operator model and serial range.
Compatible With
Supported references tie this kit to LiftMaster SL595-series slide gate operators that use the external limit box configuration.
- LiftMaster SL595 heavy-duty slide gate operators using an external limit box
- LiftMaster SL595GL industrial slide gate operators
- SL595-series units where the illustrated parts list identifies K75-18620 as the limit box kit
- Commercial and industrial slide gate applications using the matching LiftMaster external limit assembly
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | External limit box kit |
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| Part Number | K75-18620 |
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| Application | Limit box replacement for select SL595-series slide gate operators |
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| Compatible Operator Type | Commercial / industrial slide gate operators |
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| Included Components | Limit switch box, lid, panel, adjustment plate, mounting bracket, bearing, compression spring, spacer, terminal box, sensing hardware, retaining hardware as applicable |
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| Notes | Limit travel must be reset after installation |
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Also Known As / Related Part Numbers
- K75-18620
- 75-18620
- LM-K75-18620
- Limit Box Kit
- SL595 limit box
- SL595GL limit box
Technician Note
After this kit is installed, do not assume the old open and close limit settings are still correct. The gate travel should be reset and tested through multiple full cycles with all required safety devices operating.
Before Ordering
- Confirm the operator is an SL595 or SL595GL style unit using the external limit box
- Check that K75-18620 appears in the parts diagram for the exact model and revision
- Inspect the existing limit shaft, switch wiring, and mounting area for additional damage
- Plan to reset open and close limits after installation
- Do not use this kit as a substitute for unrelated SL585, SL3000, or other slide gate limit assemblies
Professional Advisory
Limit system work affects where the gate stops. If the gate is overtraveling, striking the post, or not responding correctly to limit adjustment, a qualified gate technician should inspect the full operator, entrapment protection, and control wiring before returning the gate to service.
Important Ordering Warning
This kit is not a universal LiftMaster limit box. Similar slide gate operators can use different limit assemblies, shafts, switches, and brackets.
Product Questions and Answers
What is the LiftMaster K75-18620 used for?
K75-18620 is used to replace the external limit box assembly on select LiftMaster SL595 and SL595GL slide gate operators.
Will this fix an operator that will not stop at the correct limit?
It may help if the limit box or its internal hardware is damaged, but limit problems can also come from switches, wiring, adjustment, control board issues, or mechanical overtravel.
Does the K75-18620 kit include the whole limit box assembly?
It is commonly listed as a complete limit box kit with the box, cover, adjustment and mounting hardware, shaft support parts, terminal box, and related sensing hardware as applicable.
Can K75-18620 be used on an SL585 operator?
Do not assume that it fits an SL585. This part is tied to SL595 and SL595GL limit box applications and should be verified by the operator parts diagram.
Do the gate limits need to be reset after replacing this kit?
Yes. The open and close limits should be set and tested after installation so the gate stops at the proper positions.
