The Wacker Neuson Piston is a genuine OEM component designed for ML440 Light Towers and MG5 Portable Generators. As a factory-authorized part, it is manufactured to the same specifications as the original, ensuring a direct, precise installation with no guesswork. This piston is confirmed compatible across multiple ML440 and MG5 series configurations, including the MG5sd and MG5d variants. When it comes to internal engine components, sourcing the correct OEM part is the most reliable way to restore proper compression and engine performance.
Key Features
- OEM Compression Geometry — Manufactured to exact bore diameter and crown profile specifications, preserving correct compression ratio for consistent engine output.
- Direct Drop-In Installation — Engineered to match the original piston's dimensions, pin bore, and ring groove spacing for a straightforward swap during engine rebuild or overhaul.
- Broad ML440 and MG5 Series Coverage — Fits multiple ML440 Light Tower configurations and a wide range of MG5 and MG5sd Portable Generator models under a single part number.
- Restored Engine Performance — A worn or damaged piston causes loss of compression, increased oil consumption, and rough running; replacing it with part 5000406827 restores proper cylinder pressure and smooth operation.
- Fuel System Integrity — Correct piston fit maintains the seal between combustion chamber and crankcase, preventing blow-by that can contaminate engine oil and accelerate wear across connected components.
The piston is the reciprocating component inside the engine cylinder that converts combustion pressure into mechanical force, driving the crankshaft and ultimately powering the machine. It works in conjunction with piston rings to seal combustion gases above and control oil below, maintaining the pressure differential that makes the engine run efficiently. When a piston wears, cracks, or becomes scored, compression drops, fuel consumption rises, and the engine may produce smoke or lose power — making timely replacement critical to keeping generators and light towers running at full output.
Part Details
| Part Number | 5000406827 |
|---|---|
| Old Part Number | 0406827 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Piston |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Light Towers | ML440 | 5000630117, 5000630204, 5000630323, 5000630324, 5000630325, 5000630327 |
| Portable Generators | MG5 | 5000630137, 5000630143, 5000630233, 5000630254, 5000630224, 5000630229, 5000630237, 5000630239, 5000630252, 5000630308, 5000630310 |
| Portable Generators | MG5sd | 5000630202, 5000630214, 5000630236 |
| MG5 Generator | MG5d | 5000630211 |
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.
