Liftmaster K74-18381 Hall Effect Sensor Kit SN75G0552, G75G0552 Operators

Liftmaster K74-18381 Hall Effect Sensor Kit SN75G0552, G75G0552 Operators

The LiftMaster K74-18381 hall effect sensor kit is a movement feedback sensor part for select SW420GL swing gate operators. In this type of operator, the sensor helps the control system monitor motion so it can respond to normal travel, faults, or abnormal operating conditions.

This part is commonly replaced when troubleshooting points to a failed hall effect sensor circuit, damaged sensor wiring, or a sensor that is no longer reporting movement correctly. Before replacing the sensor, a technician should also look at the gate condition, drive hardware, harness condition, control board input, and any diagnostic codes shown by the operator.

K74-18381 is a specific SW420GL-related sensor kit. It should not be grouped together with slide gate hall effect sensor kits or CSW200U board-style hall effect parts unless the parts diagram clearly confirms the same service item.

Compatible With

Common Compatible Models

• LiftMaster SW420GL swing gate operator

Additional Model Families to Verify

• SW420 style operators only when the parts diagram lists K74-18381, SN75G0552, or G75G0552
• Older LiftMaster / Elite swing gate references where the original sensor number matches

Important Compatibility Notes

• Not the same as K74-G0589 for SL590, SL595, or HS670 slide gate operators
• Not the same as K1D8247 for CSW200U swing gate operators
• Confirm connector, sensor location, and parts diagram before ordering

Features & Specifications

Also Known As / Related Part Numbers

• K74-18381
• 74-18381
• SN75G0552
• G75G0552
• SW420 hall effect sensor kit
• SW420GL hall effect sensor kit

Technician Note

If a SW420GL has a movement feedback issue, do not replace the sensor until the harness, mechanical drive, target/magnet area, and control board input have been inspected. Sensor faults can be caused by wiring or mechanical issues.

Before Ordering Checklist

• Confirm the operator is an SW420GL or verified SW420-compatible unit
• Match the original sensor number to K74-18381, SN75G0552, or G75G0552
• Inspect sensor wiring and connectors
• Check for mechanical binding or damaged drive parts
• Do not substitute a slide gate hall effect sensor kit

Professional Advisory

Swing gate operators can move with significant force. If the gate moves unpredictably, binds, or has safety faults, service should be handled by a qualified gate technician.

Important Ordering Warnings

• K74-18381 should stay separate from K74-G0589 and K1D8247 in catalog copy
• Some listings may shorten the model reference to SW420, but the strongest references point to SW420GL

Product Questions and Answers

Which operator commonly uses K74-18381?

K74-18381 is commonly listed for LiftMaster SW420GL swing gate operators.

What are the related numbers for this kit?

SN75G0552 and G75G0552 are commonly listed as related numbers for this hall effect sensor kit.

Is this the same part as K74-G0589?

No. K74-G0589 is commonly tied to select slide gate operators such as SL590, SL595, and HS670. K74-18381 is tied to SW420GL applications.

What symptoms can point to a hall effect sensor issue?

Possible symptoms include movement feedback faults, intermittent stops, failure to detect gate motion, or diagnostic behavior tied to the sensor circuit.

Should I replace the sensor before checking wiring?

No. Wiring, connectors, target position, board input, and gate mechanics should be inspected before replacing the sensor.