The Wacker Neuson Piston (0.50) is a genuine OEM component designed for the RD12A-90 Tandem Roller series, including the standard, Foldable ROPS, and double drum configurations. As a factory-sourced part, the is held to Wacker Neuson's own manufacturing tolerances, ensuring the correct fit within the engine assembly. This piston is the right choice when a worn or damaged piston needs to be replaced with a part that matches the original specification exactly. Confirm your model number against the fitment list before ordering to make sure this is the correct size for your application.
Key Features
- OEM Dimensional Accuracy — Manufactured to Wacker Neuson's specified bore clearance and ring groove tolerances, so the piston seats and seals correctly within the cylinder.
- 0.50 Oversize Rating — This is a 0.50 oversize piston, intended for engines where the cylinder has been bored out to accommodate an oversize replacement — verify your bore measurement before ordering.
- Drop-In Engine Fit — Engineered to install directly into the RD12A-90 engine assembly using the existing wrist pin and connecting rod, keeping the rebuild straightforward.
- RD12A-90 Series Coverage — Confirmed fitment across the RD12A-90 Tandem Roller, RD12A-90 Tandem Roller with Foldable ROPS, and the RD12A-90 double drum green configuration.
- Compression Integrity Restored — A correctly fitted piston maintains proper compression, which directly affects compaction force output and consistent drum performance on the job.
- Genuine OEM Sourcing — Sourced directly through Wacker Neuson's parts program, so you receive the same component used in original production — no guesswork on material grade or geometry.
The piston is a core reciprocating component inside the engine's cylinder, converting the force of combustion into the mechanical motion that drives the machine. It works in close contact with the cylinder wall and piston rings to maintain compression and control oil consumption — when a piston wears, scores, or cracks, compression drops, the engine loses power, and oil use increases. Replacing a worn piston with a correctly sized oversize unit, after the cylinder has been properly bored and measured, restores compression and returns the engine to full working condition.
Part Details
| Part Number | 5000214857 |
|---|---|
| Old Part Number | 0214857 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Piston (0.50) |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| RD12A-90 Tandem Roller | RD12A-90 | 5000620058, 5000620320, 5000620369 |
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.
