The Wacker Neuson Relay is a genuine OEM component designed for the HI 770 XHD series indirect-fired diesel air heaters, including Arctic Bear XHD and Arctic Bear XHD NS configurations. As a direct factory replacement, this relay installs to the original mounting position with no adaptation needed, restoring proper electrical switching function to your heater. Wacker Neuson genuine OEM parts are manufactured to the same specifications as the original, ensuring the performs exactly as the machine was designed to operate. Compatible across multiple HI 770 XHD configurations and machine numbers, this part is the correct choice for maintaining your heater's performance on the jobsite.
Key Features
- Correct Switching Specification — Genuine OEM relay matched to the electrical load and voltage requirements of the HI 770 XHD heater circuit, ensuring proper coil actuation and contact performance.
- Direct OEM Replacement — Mounts to the original relay position in the heater's control circuit, connecting to existing wiring harness terminals without modification.
- Broad HI 770 XHD Compatibility — Fits Arctic Bear XHD, Arctic Bear XHD NS, and standard HI 770 XHD indirect-fired diesel air heater variants across multiple configurations.
- Restored Heater Control Function — A failed relay can prevent the burner from igniting or cause erratic heater cycling; replacing it restores consistent, controlled heat output.
- Electrical Safety Assurance — As a switching component in a diesel-fired heater's control circuit, using a correctly rated OEM relay is essential to safe ignition sequencing and burner shutoff operation.
The relay in an indirect-fired air heater acts as an electrically controlled switch, routing power to key components such as the burner motor, igniter, or fuel system based on signals from the heater's control board. When the relay functions correctly, the heater cycles on and off as commanded, maintaining steady heat output. A worn or failed relay can result in a heater that won't start, won't shut off, or behaves erratically — all of which interrupt work in cold-weather applications where consistent heat is critical.
Part Details
| Part Number | 5000166786 |
|---|---|
| Old Part Number | 0166786 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Relay |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| HI 770 XHD Indirect Air Heater, Diesel, 2x12 | Arctic Bear XHD | 5000620676 |
| HI 770 XHD Indirect Air Heater, Diesel, 1x16 | HI770XHD | 5000620183, 5200003814, 5200004934, 5100049894 |
| HI770XHD Indirect Heater | Arctic Bear XHD NS | 5000620690 |
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.
