The Genie 139278GT Thermostat is a genuine OEM component built for a wide range of Genie light towers, scissor lifts, and boom lifts, including AL and RL series light towers, GS rough-terrain scissor lifts, S series telescopic boom lifts, and Z series articulating boom lifts. As a direct OEM replacement, this thermostat is manufactured to the same specification as the part it replaces, ensuring correct operation across every compatible unit. Cross-reference part number 139278GT against your machine's parts manual to confirm it is the right item for your specific model before ordering. DHS Equipment stocks this genuine Genie part ready to ship when your machine needs it most.
Key Features
- Genuine OEM Specification — Manufactured to the exact calibration and temperature rating of the original part, so the engine's thermal management performs as designed from the moment the thermostat is installed.
- Direct OEM Replacement — Matches the original thermostat's housing dimensions and connection points for a straightforward swap with no adaptation needed on compatible units.
- Broad Genie Fitment — Fits AL4, AL4L, AL5, AL5L, AL5HT, AL4000, AL5000, RL4, RL4000, TML-4000, GS scissor lifts, S series telescopic booms, and Z series articulating booms across multiple configurations.
- Engine Temperature Control — A correctly functioning thermostat keeps the engine operating in its intended temperature range. A stuck-open or stuck-closed thermostat causes the engine to run too cool or overheat, leading to reduced output and potential engine damage.
- Operational Safety — Sustained engine overheating can trigger shutdowns and compromise machine availability at height. Replacing a failed thermostat with the correct OEM part restores the thermal protection the engine relies on.
A thermostat is a temperature-sensitive valve that regulates coolant flow through the engine. When the engine is cold, it holds the valve closed so the engine warms up quickly to its operating temperature. Once the engine reaches that temperature, the valve opens to allow coolant to circulate and carry heat away. A thermostat that fails in the closed position causes rapid overheating; one that fails open prevents the engine from reaching proper operating temperature, which increases wear and reduces efficiency. Replacing a worn or failed thermostat with the correct OEM part — Genie 139278GT — restores proper thermal regulation and protects the engine across every duty cycle.
Part Details
| Part Number | 139278GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Thermostat |
Compatibility & Fitment
| Name | Model |
|---|---|
| AL4000 | AL4000 |
| AL5000 | AL5000 |
| RL4000 | RL4000 |
| TML-4000 | TML-4000 |
| AL5 with Vertical Mast | AL5 with Vertical Mast |
| AL4 | AL4 |
| RL4 | RL4 |
| AL5 | AL5 |
| AL4L | AL4L |
| AL5L | AL5L |
| AL5HT | AL5HT |
| S-60 FE Hybrid | S-60 FE Hybrid |
| S-60 DC | S-60 DC |
| S-60 FE | S-60 FE |
| S-85 XC FE | S-85 XC FE |
| S-85 XC E | S-85 XC E |
| GS-2669RT | GS-2669RT |
| GS-3369RT | GS-3369RT |
| GS-4069RT | GS-4069RT |
| GS-2668 RT | GS-2668 RT |
| GS-3268 RT | GS-3268 RT |
| Z-34/22 IC | Z-34/22 IC |
| Z-60/37 DC | Z-60/37 DC |
| Z-60/37 FE Hybrid | Z-60/37 FE Hybrid |
| Z-60 DC | Z-60 DC |
| Z-60 FE Hybrid | Z-60 FE Hybrid |
| Z-45 FE Hybrid | Z-45 FE Hybrid |
| Z-45 DC | Z-45 DC |
| Z-34 IC | Z-34 IC |
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.
