The Wacker Neuson is a genuine OEM Lock Washer designed for the HI750GM and HI900DGM series indirect-fired air heaters. Sourced directly from Wacker Neuson, this part meets the original manufacturer's specifications and is a direct, verified replacement for the unit it came out of. Compatible across multiple HI750GM and HI900DGM configurations — including surge brake, mobile, and heavy-duty variants — this Lock Washer covers a broad range of indirect heater builds in a single part number. Keep a spare on hand to minimize time lost during routine maintenance or field service on your heating equipment.
Key Features
- Genuine OEM Fastener Integrity — Manufactured to Wacker Neuson's original torque-retention and material hardness specifications, so the locking engagement holds under the vibration and thermal cycling typical of indirect-fired heater operation.
- Drop-In Replacement — Matches the original bore diameter, outer profile, and bite geometry, so it installs in the same position without modification to surrounding hardware.
- Broad HI Series Fitment — Confirmed fit across HI750GM, HI750GM HD Mobile, HI900DGM, and HI900DGM Surge Brake indirect air heater configurations.
- Prevents Fastener Back-Out — A lock washer that has lost its temper or deformed over time allows fasteners to loosen under vibration, which can lead to misaligned components or unplanned service stops in cold-weather jobsite conditions.
- Fuel and Combustion System Safety — Used in the fastener stack of an indirect heater, a properly functioning lock washer maintains the clamping load on connections near fuel and combustion components, where fastener loosening poses a genuine safety concern.
A lock washer is a hardened, deformable ring placed under a fastener to resist loosening caused by vibration, thermal expansion, and contraction. In an indirect-fired air heater like the HI750GM and HI900DGM, components are exposed to continuous heat cycling and mechanical vibration from the burner assembly and blower, making fastener retention critical. When a lock washer loses its temper, flattens, or corrodes, it can no longer maintain clamping force — allowing bolts and screws to back out and potentially compromising the integrity of fuel, combustion, or airflow connections.
Part Details
| Part Number | 5000179024 |
|---|---|
| Old Part Number | 0179024 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Lock Washer |
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.
