The Wacker Neuson Switch (180°F) is a genuine OEM temperature switch designed for HI750 and HI900 series indirect-fired air heaters. As a direct factory replacement, this switch matches the original component specification and installs in the same position as the unit it replaces. It fits a wide range of HI750 and HI900 configurations including diesel, natural gas, and dual-fuel models, as well as skid-mounted and surge-brake variants. Sourcing the correct OEM switch ensures the heater's thermal control circuit operates exactly as Wacker Neuson intended.
Key Features
- Calibrated Thermal Actuation: — Factory-set to actuate at 180°F, ensuring the switch opens and closes at the correct temperature threshold for safe, consistent heater operation.
- Genuine OEM Component: — Supplied directly by Wacker Neuson, this switch carries the same part number and construction as the original installed unit — no guesswork on compatibility.
- Broad HI-Series Fitment: — Confirmed fitment across HI750G, HI750D, HI750GM, HI750GMHD, HI900D, HI900G, and HI900DGM model families, including skid-mounted and mobile configurations.
- Thermal Circuit Integrity: — A correctly functioning temperature switch protects the heater from overheating conditions; a failed or out-of-spec switch can cause nuisance shutdowns or, conversely, allow unsafe temperature buildup.
- Safety-Critical Fuel System Control: — This switch is part of the heater's high-limit protection circuit. Using the correct OEM-rated component helps maintain the system's designed safety response to over-temperature events.
The Switch (180°F) is a high-limit or operating temperature switch that monitors heat levels within the indirect-fired air heater and signals the control circuit when a defined temperature threshold is reached. On indirect heaters like the HI750 and HI900 series, this type of switch serves as a safeguard — cutting fuel flow or triggering a shutdown if temperatures climb beyond safe operating limits. When this switch fails, the heater may shut down unexpectedly during normal operation, fail to restart, or — if stuck closed — allow the unit to run beyond its safe temperature range. Replacing a worn or faulty switch with the correct 5000181861 restores proper thermal control and keeps the heater running safely through demanding cold-weather jobsite conditions.
Part Details
| Part Number | 5000181861 |
|---|---|
| Old Part Number | 0181861 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Switch (180°F) |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| HI750 DGM HEATER-INDIRECT | HI750GM | 5000620859, 5000620930 |
| Mobile Indirect Fired Air Heat er, Diesel | HI750D | 5000620856, 5000620923, 5000620924 |
| HI 750GM HD-Mobile Indirect Ai r Heater-Surge, -40 | HI750GMHD | 5000620969 |
| HI750G HEATER-INDIRECT | HI750G | 5000620857, 5000620928, 5000620929 |
| HI900 Heater-DGM,Srg,-40 | HI900DGM | 5200014221, 5200014222, 5200014165, 5200014166 |
| HI 900D Heater-Indirect | HI900D | 5200014158, 5200014159, 5200014160 |
| Skid Indirect Air Heaters Natu ral Gas | HI900G | 5200014161 |
| HI 900G Heater-Indirect,3x16 | HI900 G | 5200014163, 5200014164 |
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.
