The Wacker Neuson Piston is a genuine OEM Piston designed for the GP5600A generator and PT4A and PT4A(I) series trash pumps. Sourced directly from Wacker Neuson, this is the same part fitted at the factory — ensuring correct dimensions, material grade, and ring land geometry for your specific engine. Confirmed fitment spans the GP5600A, PT4A, and PT4A(I) models, so you can order with confidence knowing this is the right part for your machine.
Key Features
- OEM Dimensional Accuracy — Manufactured to exact bore tolerances, ensuring correct compression ratio and proper ring seal against the cylinder wall.
- Drop-In Engine Replacement — Matches the original piston profile and pin bore dimensions for straightforward installation during a top-end engine rebuild.
- Broad Model Coverage — Fits the GP5600A generator and PT4A and PT4A(I) trash pump series in a single part number.
- Sustained Engine Output — A correctly fitted piston maintains full compression, supporting rated power output and fuel efficiency across the equipment's working life.
- Genuine Wacker Neuson Quality — Produced under Wacker Neuson's OEM standards using materials engineered to handle the thermal and mechanical loads of these specific engines.
The piston is the reciprocating heart of a four-stroke engine — it travels up and down inside the cylinder bore, compressing the air-fuel mixture and transferring combustion force to the crankshaft via the connecting rod. A healthy piston maintains the tight seal needed for full compression; when a piston wears, scores, or cracks, the engine loses power, burns oil, runs roughly, or fails to start altogether. Replacing a worn piston with a correctly specified OEM part restores compression and gets your generator or pump back to full working capacity.
Part Details
| Part Number | 5100039329 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Piston |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| GP5600A | GP5600A | 5100041979 |
| PT4A | PT4A | 5100042217, 5100042604 |
| PT4A(I) | PT4A(I) | 5100042615 |
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.
