The Wacker Neuson Piston is a genuine OEM Piston designed for the PTS4V 100mm/4-inch centrifugal trash pump series, GPS8500 and GS8.5V portable generators with electric start, and the RD11V and RD880V double drum vibratory rollers. As a factory-sourced component, the is manufactured to the exact tolerances specified for these engines, ensuring a correct fit with cylinder walls, rings, and connecting rod assemblies. This piston is the same part Wacker Neuson installs at the production level, giving you confidence in both fitment and long-term engine integrity. If you are maintaining or overhauling any of the compatible machines listed, verifying part number against your serial number is the first step to getting it right.
Key Features
- OEM Dimensional Accuracy — Machined to the exact bore diameter and compression height specified for these Wacker Neuson engines, ensuring proper ring seal and combustion efficiency.
- Drop-In Engine Compatibility — Engineered to align directly with the existing connecting rod, wrist pin, and cylinder bore on compatible PTS4V, GPS8500, GS8.5V, RD11V, and RD880V machines.
- Multi-Platform Fitment — A single OEM part number covering the PTS4V trash pump series, GPS8500 and GS8.5V generator models, and RD11V/RD880V double drum rollers — confirm your machine serial number before ordering.
- Sustained Engine Compression — A correctly fitted piston maintains the compression ratio the engine was designed for, directly supporting power output, fuel efficiency, and smooth operation across all load conditions.
- Failure Prevention — A worn or damaged piston leads to blow-by, loss of compression, excessive oil consumption, and potential cylinder wall scoring — replacing with a genuine OEM part stops further internal engine damage.
The piston is one of the most critical reciprocating components inside a four-stroke engine. It travels up and down inside the cylinder bore with each combustion cycle, compressing the air-fuel mixture on the compression stroke and transferring the force of combustion to the crankshaft via the connecting rod. The piston also works in conjunction with piston rings to seal combustion gases above and control oil below, keeping those two functions separate. When a piston wears, cracks, or loses its ring groove integrity, compression drops, oil burns into the combustion chamber, and engine performance deteriorates rapidly — making timely replacement essential to protecting the rest of the engine assembly.
Part Details
| Part Number | 5000080977 |
|---|---|
| Old Part Number | 0080977 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Piston |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| 100mm/4in Centrifugal Trash Pu mp | PTS4V | 5000007691, 5000007683, 5000620971, 5100031221 |
| Portable Generator with Electr ic Start | GPS8500 | 5000008286 |
| Portable Generator with Electr ic Start | GS8.5V | 5000007661 |
| PTS4V(I) Pump | PTS4V(I) | 5000620972 |
| Hydrostatic Double Drum Vibrat ory Roller | RD11V | 5000007694 |
| Double Drum Vibratory Roller | RD880V | 5000006736 |
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.
