The Wacker Neuson Second Ring is a genuine OEM component designed for the ML440 Light Tower and MG5 Portable Generator series. Sourced directly from Wacker Neuson, this second ring is manufactured to the same specifications as the original part, ensuring a correct drop-in fit within the engine's piston ring stack. It is compatible across a broad range of ML440 and MG5 series units, including MG5sd and MG5d variants, making it a reliable solution for scheduled overhauls or unplanned engine repairs on this equipment family.
Key Features
- Genuine OEM Ring Material and Profile — Manufactured by Wacker Neuson to the exact ring geometry and material grade specified for this engine, ensuring correct compression and oil control performance.
- Direct Engine Replacement — Seats into the second ring groove of the piston as designed, requiring no modification to the piston or bore to install correctly.
- Broad Series Fitment — Compatible with ML440 Light Towers and MG5, MG5sd, and MG5d Portable Generator models, covering multiple build configurations within these product families.
- Compression Integrity Restored — A worn or broken second ring allows combustion gases to bypass the piston, robbing the engine of power and increasing oil consumption; replacing it restores proper cylinder sealing and engine output.
- Verified OEM Part Number — Part number 5000404861 is the Wacker Neuson-assigned reference for this ring, confirming you are ordering the correct component for this application.
The second ring is the middle ring in a piston's ring pack, positioned between the top compression ring and the oil control ring. Its primary role is to assist the top ring in sealing combustion gases within the cylinder while also helping to scrape excess oil from the cylinder wall on the piston's downstroke. When the second ring wears, cracks, or loses its spring tension, cylinder compression drops, oil begins burning in the combustion chamber, and exhaust smoke increases — all signs that engine performance has been compromised and a ring replacement is needed to restore normal operation.
Part Details
| Part Number | 5000404861 |
|---|---|
| Old Part Number | 0404861 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Second Ring |
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.
