The Wacker Neuson First Ring is a genuine OEM component designed for ML440 Light Towers and MG5 series Portable Generators. As a direct OEM part, it is manufactured to the exact specifications required by these machines, ensuring a correct, drop-in installation with no guesswork. This ring is compatible across a wide range of ML440 and MG5 configurations, including MG5sd and MG5d variants. Confirm your model number against the fitment list before ordering to ensure this is the right part for your application.
Key Features
- OEM Compression Integrity — Sourced directly from Wacker Neuson, this first ring meets the exact dimensional and material tolerances required to maintain proper cylinder compression in these engines.
- Direct Drop-In Installation — Engineered to seat correctly in the ring groove without fitting adjustments, making the installation process straightforward during an engine rebuild.
- Broad ML440 and MG5 Fitment — Compatible with multiple ML440 Light Tower configurations and MG5, MG5sd, and MG5d Portable Generator variants, covering a wide range of Wacker Neuson equipment in a single part number.
- Engine Performance Protection — A properly seated first ring maintains the combustion seal that allows the engine to produce consistent power output; a worn or broken ring leads to blow-by, oil consumption, and loss of compression.
- Combustion Sealing at the Critical Zone — The first ring carries the highest combustion pressure load of any piston ring; using a correctly specified OEM ring preserves the integrity of the combustion chamber under working conditions.
The first ring is the topmost piston ring and carries the primary responsibility of sealing the combustion chamber from the crankcase. It withstands the highest temperatures and pressures in the engine, forming a gas-tight barrier that allows combustion gases to drive the piston downward efficiently. When this ring wears, breaks, or loses its tension, combustion pressure escapes past the piston, resulting in reduced power, increased oil consumption, and excessive smoke from the exhaust — all signs that the ring needs immediate replacement to restore engine health.
Part Details
| Part Number | 5000404860 |
|---|---|
| Old Part Number | 0404860 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | First 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.
