LiftMaster K76-37306 Limit Switch Kit for SL3000U and SL3000UL Operators
The LiftMaster K76-37306 limit switch kit is a service replacement used in the travel-limit system of select LiftMaster gate operators. The strongest product references identify it for SL3000U and SL3000UL commercial slide gate operators, while some listings also associate the part with RSL12 and RSW12 DC gate operator families. Limit switches tell the control system where the gate should stop in the open and close directions. When a limit switch assembly fails, the operator may overtravel, stop short, fail to learn limits, or show limit-related faults. Because LiftMaster uses several different limit assemblies across operator families, K76-37306 should be confirmed by the exact model, suffix, and original parts diagram before ordering.
Compatible With
This part is intended for the following LiftMaster applications when the model, suffix, and parts diagram confirm the same service part:
- Strongest references list SL3000U and SL3000UL slide gate operators. Some references mention RSL12U/RSL12UL/RSL12V and RSW12U/RSW12UL/RSW12V; use only where confirmed by the parts diagram.
Common Replacement Reasons
- Gate overruns the open or close stop point.
- Operator cannot learn or hold travel limits.
- Gate stops short even after adjustment.
- Existing limit switch assembly or harness is damaged.
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Limit Switch Kit |
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| Part Number | K76-37306 |
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| Application | Travel limit switch service replacement |
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| Compatible Operator Type | Commercial slide gate and select DC gate operator systems |
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| Compatible Models | SL3000U and SL3000UL strongest; other RSL/RSW references require verification |
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| Included Components | Limit switch assembly and related mounting/harness components where supplied |
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| Notes | Do not confuse with K76-37325 limit rack kit or K76-35321 passpoint kit. |
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Also Known As / Related Part Numbers
The following numbers and search variations are commonly associated with this item or related service references. Verify exact replacement status before substituting any related number.
- K76-37306
- 76-37306
- K7637306
- SL3000U limit switch kit
- SL3000UL limit switch assembly
Technician Note
LiftMaster gate operator parts can vary by model generation, voltage, enclosure layout, and internal harness configuration. Match this part to the original component and the operator parts diagram before installation. Similar-looking reset switches, receptacles, limit parts, antennas, and alarm harnesses may not interchange across SL, RSL, RSW, CSW, LA, PPWR, or STAR1000 applications.
Before Ordering
- Confirm the manufacturer part number on the original part or service diagram.
- Check the operator model number and suffix on the equipment label.
- Compare mounting style, connector type, harness routing, voltage rating, and kit contents where applicable.
- For limit parts, confirm whether the operator needs a switch kit, passpoint kit, rack kit, or complete limit box assembly.
- For electrical parts, inspect the cause of failure before replacing the component.
Professional Advisory
Do not bypass monitored safety devices, alarms, interlocks, reset circuits, or factory protection features to keep a gate running. Disconnect power before servicing internal components. For high-voltage wiring, damaged control boxes, heavy slide gates, or operators that move unpredictably, have the system inspected by a qualified gate technician.
Important Ordering Warnings
- Do not rely on the product description alone when the operator has multiple generations or suffixes.
- Do not substitute a similar K76, K74, K23, K70, or K94 part number unless the parts diagram confirms the substitution.
- Limit-system repairs may require travel-limit setup and safety testing after installation.
- Receiver antenna repairs should also include a check of remote compatibility, receiver placement, and interference conditions.
Product Questions and Answers
What models are most strongly tied to K76-37306?
The strongest references list LiftMaster SL3000U and SL3000UL slide gate operators. Other RSL12 and RSW12 references should be verified by parts diagram.
What does a limit switch kit control?
It helps the operator know where to stop in the open and close directions. A failed limit switch can cause overtravel, short travel, or limit-learning issues.
Is K76-37306 interchangeable with K76-37325?
No. K76-37306 is a limit switch kit, while K76-37325 is a limit rack kit. They work in limit systems but are different parts.
Should limits be reset after installation?
Yes, limit settings and travel should be checked after replacing limit components. Follow the operator manual for proper setup.
Can a bad chain, wheel, or gate track look like a limit problem?
Yes. Binding, loose chain, damaged wheels, or a gate hitting an obstruction can create symptoms that seem like limit failure. Inspect the gate hardware as part of diagnosis.
