The Genie 139644-12B40GT is a genuine OEM Blue Tab Micro Limit Switch built for Genie SX-150 and SX-180 telescopic boom lifts. As a direct OEM replacement, this switch is manufactured to the same specifications as the original, ensuring correct electrical response and reliable operation in the field. Confirm part number 139644-12B40GT against your machine's parts manual to verify it is the correct switch for your serial number range before ordering.
Key Features
- Genuine OEM Electrical Spec — Manufactured to the original switching characteristics, including correct actuation force and circuit ratings for the application.
- Tab-Style Actuator — The tab actuator design engages the trigger mechanism consistently, maintaining accurate switch actuation in demanding lift cycles.
- Color-Coded Blue — The blue tab identification matches OEM harness and switch layouts, making installation and inspection straightforward.
- Direct OEM Replacement — Installs in place of the original component without modification, keeping the machine's control circuit intact.
- Built for SX Super-Boom Lifts — Specifically fits Genie SX-150 and SX-180 telescopic boom lifts, the tallest machines in the Genie S-series boom range.
- Operational Safety — Limit switches govern critical machine movements and position sensing on aerial lifts; a failed or sticking switch can compromise boom control response. Using the correct OEM part maintains the integrity of the control circuit.
A limit switch is an electromechanical component that detects the position or movement of a machine element and sends a signal to the control system to allow, stop, or restrict that movement. On Genie SX telescopic boom lifts, limit switches play a key role in controlling boom functions at defined travel boundaries. When a limit switch fails — through a worn actuator, broken tab, or loss of electrical continuity — the control system may not receive the correct position signal, causing erratic boom behavior or a complete loss of the affected function. Replacing a faulty switch with the correct OEM part, such as this Blue Tab Micro Limit Switch, restores accurate position sensing and proper machine response.
Part Details
| Part Number | 139644-12B40GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Blue Tab Micro Limit Switch |
Compatibility & Fitment
| Name | Models |
|---|---|
| SX-150 | SX-150 |
| SX-180 | SX-180 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
