The Wacker Neuson Piston Complete is a genuine OEM component designed for the APT4S and APT4T pump series, including standard, surge brake, electric brake, and cold weather configurations. As a factory-sourced part, it is manufactured to the same specifications as the original, ensuring a direct drop-in installation with no guesswork. This piston assembly covers a broad range of APT4 variants — from skid-mounted APT4S units to APT4T pumps equipped for surge or electric braking — making it the correct choice whether you're servicing a standard or cold weather model. Keep part number on hand for any scheduled rebuild or unplanned repair on these pump platforms.
Key Features
- OEM-Grade Dimensional Accuracy — Manufactured to original bore tolerances, ensuring proper compression seal and consistent stroke performance within the pump cylinder.
- Direct Installation Fit — Engineered to seat and align exactly as the factory original, working with existing rings, pins, and cylinder components without reworking.
- Broad APT4 Series Coverage — Compatible with APT4S and APT4T pumps across standard, surge brake, electric brake, and cold weather variants.
- Sustained Pumping Output — A correctly fitted piston maintains compression and displacement efficiency; a worn or damaged piston causes pressure loss, reduced flow, and overworking of the drive system.
- Genuine Wacker Neuson OEM Part — Sourced directly from Wacker Neuson, carrying the full assurance of authentic parts traceability and correct part number verification.
The piston is the core reciprocating component inside the pump cylinder, converting mechanical energy into fluid pressure and flow. It moves back and forth within the cylinder bore, drawing fluid in on the intake stroke and forcing it out under pressure on the discharge stroke. When a piston wears, cracks, or loses its sealing integrity, the pump delivers reduced output pressure, uneven flow, or fails to prime altogether — all conditions that put added stress on surrounding components and bring work to a halt.
Part Details
| Part Number | 5200020064 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Piston Complete |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT4T Pump, Surge Brake | APT4T | 5200019643, 5200019644 |
| APT4T Pump, Surge Brake, Cold Weather | APT4T CW | 5200019792, 5200019793 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
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.
