The Wacker Neuson Lock Nut is a genuine OEM lock nut designed for the E5000 Ground Heater and the HI750GM and HI750GMHD series indirect-fired air heaters. Sourced directly from Wacker Neuson, this part carries the same specifications as the hardware installed at the factory, ensuring a correct, secure fit every time. The is confirmed compatible across the E5000 12kW Diesel Ground Heater, the HI750GM indirect heater variants, and the HI750GMHD Mobile Indirect Air Heater Surge models — making it a single-part solution for mixed fleets running these climate equipment lines.
Key Features
- Genuine OEM Hardware Integrity — Manufactured to exact thread pitch, material grade, and torque retention standards required by Wacker Neuson heating equipment.
- Direct Hardware Replacement — Threads in as a direct swap for the original fastener; no chasing threads or reworking mounting points needed.
- Broad Heater Fleet Coverage — Fits the E5000 Ground Heater, HI750GM indirect heater series, and HI750GMHD Mobile Indirect Air Heater Surge, covering multiple indirect-fired and ground-heating configurations.
- Secure Fastening Under Thermal Cycling — Heating equipment endures constant expansion, contraction, and vibration; a properly torqued lock nut maintains clamping force and prevents fastener back-out during operation.
- Fuel and Combustion System Safety — On indirect-fired heaters, properly secured fasteners are critical to maintaining sealed combustion and exhaust pathways; using the correct OEM specification lock nut supports safe, code-compliant operation in enclosed worksites.
A lock nut is a threaded fastener engineered to resist loosening under vibration and thermal cycling — conditions that are constant in indirect-fired air heaters and diesel ground heating equipment. Unlike a standard nut, a lock nut uses a prevailing-torque or deformed-thread design to maintain clamping load even as components expand and contract through heat-up and cool-down cycles. When a lock nut wears out, strips, or is lost during service, the resulting loose fastener can allow components to shift, creating leaks, misalignment, or unsafe combustion conditions — particularly in fuel system and exhaust-adjacent assemblies where joint integrity is critical.
Part Details
| Part Number | 5000166664 |
|---|---|
| Old Part Number | 0166664 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Lock Nut |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| E5000 Ground Heater, 12kw Gen, Diesel | E5000 | 5000620899 |
| HI750 DGM HEATER-INDIRECT | HI750GM | 5000620859, 5000620930 |
| HI 750GM HD-Mobile Indirect Ai r Heater-Surge, -40 | HI750GMHD | 5000620969 |
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.
