The Wacker Neuson Piston (0.25) is a genuine OEM component designed for the RD12A-90 Tandem Roller series, including standard, Foldable ROPS, and double drum configurations. As a direct OEM replacement, this piston is manufactured to the same tolerances and material specifications as the original part — ensuring it seats, seals, and cycles exactly as intended within the engine assembly. Whether you're completing a scheduled overhaul or addressing unexpected wear, part number is the correct service specification for this application. Sourcing the genuine Wacker Neuson part means you're working with the same component that came off the production line.
Key Features
- OEM-Grade Dimensional Tolerancing — Machined to the same bore clearance and ring land specifications as the original, ensuring proper compression and combustion efficiency in the engine.
- Oversized Service Specification (0.25) — This is a 0.25 oversize piston, matched to cylinders bored or worn to that service dimension — install with confidence into a correctly prepared bore.
- Direct Fit for RD12A-90 Tandem Rollers — Confirmed fitment across standard, Foldable ROPS, and double drum RD12A-90 variants; no guesswork on compatibility.
- Restored Compression and Power Output — A worn or damaged piston causes loss of compression, increased oil consumption, and rough running; replacing with 5000214856 restores proper engine output and smooth operation.
- Genuine Wacker Neuson OEM Part — Supplied as an authorized OEM component, giving you full confidence in material grade, heat treatment, and dimensional accuracy versus the service manual specification.
The piston is a core reciprocating component inside the engine cylinder, transferring combustion pressure into crankshaft rotation that ultimately drives the roller's vibration and propulsion systems. As the piston travels up and down, its rings maintain a seal against the cylinder wall — holding compression and preventing oil from entering the combustion chamber. When a piston wears beyond service limits or suffers damage, the results include loss of power, excessive oil burning, and eventually engine failure; fitting an oversized piston like the 5000214856 during a bore-and-rebuild service restores that critical seal and returns the engine to full working condition.
Part Details
| Part Number | 5000214856 |
|---|---|
| Old Part Number | 0214856 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Piston (0.25) |
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.
