The Genie 1276739GT Isuzu Tier 4 Thermostat is a genuine OEM engine cooling component designed for AL5 and AL5 with Vertical Mast light towers. Sourced directly from Genie, this thermostat is built to the exact specification required by the Isuzu Tier 4 engine powering these units, ensuring it integrates correctly with the engine's cooling circuit right out of the box. Cross-reference part number 1276739GT against your parts manual to confirm fitment before ordering.
Key Features
- Genuine OEM Engine Spec — Manufactured to Genie and Isuzu's exact tolerances for the Tier 4 engine, ensuring correct opening temperature and proper coolant flow regulation.
- Direct Engine Drop-In — Matches the OEM housing geometry and sealing interface of the Isuzu Tier 4 engine fitted to AL5 light towers, making installation straightforward.
- Confirmed Fitment — Designed specifically for the AL5 and AL5 with Vertical Mast light towers, so you can order with confidence.
- Stable Operating Temperatures — A properly functioning thermostat keeps the engine in its optimal thermal range, supporting consistent power output and fuel efficiency during extended jobsite lighting runs.
- Engine Protection — A failed or stuck thermostat can cause overheating or chronic under-temperature operation, both of which accelerate engine wear on Tier 4 units — replacing it promptly protects the long-term health of the power plant.
A thermostat regulates engine coolant flow between the engine block and the radiator. When the engine is cold, the thermostat stays closed, keeping coolant circulating within the engine to reach operating temperature quickly. Once the engine warms to its calibrated threshold, the thermostat opens and allows coolant to pass through the radiator for cooling. On Isuzu Tier 4 engines, precise thermal management is especially important — these emissions-compliant engines rely on stable operating temperatures to maintain proper fuel injection timing and exhaust aftertreatment performance. A thermostat that sticks open, sticks closed, or opens at the wrong temperature can cause overheating, poor fuel economy, or damage to emissions-related components.
Part Details
| Part Number | 1276739GT |
|---|---|
| Brand | Genie |
| Part Type | Genuine OEM |
| Description | Isuzu Tier 4 Thermostat |
Compatibility & Fitment
| Name | Model |
|---|---|
| AL5 with Vertical Mast | AL5 with Vertical Mast |
| AL5 | AL5 |
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.
