The Wacker Neuson Radiator Cap is a genuine OEM component designed for the HI750GM and HI900DGM series indirect-fired air heaters. Sourced directly from Wacker Neuson, this cap is manufactured to the exact pressure specification required by these diesel-powered heating units. It fits across multiple HI750GM and HI900DGM configurations, including surge brake and mobile variants. Confirming your model number against the fitment list before ordering ensures a direct, correct installation.
Key Features
- Correct Pressure Rating for Indirect Heater Cooling Systems — engineered to the exact cap pressure spec for the HI750GM and HI900DGM coolant circuits, preventing improper venting or coolant loss.
- Genuine OEM Part — supplied by Wacker Neuson, so the cap seats, seals, and releases at the same threshold as the original, with no guesswork on compatibility.
- Broad HI-Series Fitment — covers HI750GM, HI750GM HD Mobile, HI900DGM, and related surge brake and electric configurations within the indirect heater lineup.
- Protects Coolant System Integrity — a worn or failed radiator cap allows coolant to boil off and introduces air into the system, leading to overheating and heater shutdown in cold-weather operations where reliability is critical.
- Fuel and Coolant System Safety — an improperly rated cap on a pressurized cooling circuit can cause unexpected coolant discharge; using the correct OEM-spec cap maintains safe operating pressure across the full temperature range of these heaters.
The radiator cap seals the cooling system and maintains the designed operating pressure within the coolant circuit. By raising the boiling point of the coolant under pressure, it allows the system to operate at higher temperatures without losing fluid — keeping the heat exchanger in the HI750GM and HI900DGM heaters running efficiently in demanding cold-weather conditions. When a radiator cap wears out or loses its sealing ability, coolant escapes, pressure drops, and the machine becomes vulnerable to overheating or unexpected shutdowns at the worst possible time on a winter jobsite.
Part Details
| Part Number | 5000183721 |
|---|---|
| Old Part Number | 0183721 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Radiator Cap |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| HI750 DGM HEATER-INDIRECT | HI750GM | 5000620859, 5000620930 |
| HI 750GM HD-Mobile Indirect Ai r Heater-Surge, -40 | HI750GMHD | 5000620969 |
| HI900 Heater-DGM,Srg,-40 | HI900DGM | 5200014221, 5200014222, 5200014165, 5200014166 |
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.
