The Wacker Neuson Piston is a genuine OEM Piston designed for the APT4S and APT4T pump series, including standard, surge brake, electric brake, and cold weather variants. As a factory-sourced component, it is manufactured to the exact tolerances required for proper pump operation and long service life. This piston is a direct drop-in replacement for all listed APT4S and APT4T configurations, covering both skid-mounted and cold weather package builds.
Key Features
- OEM-Matched Dimensional Tolerancing — Manufactured to the exact bore dimensions and surface finish specifications required for consistent compression and seal contact in APT series pump cylinders.
- Direct-Fit Installation — Seats and connects into the pump assembly the same way as the original, with no reworking of mating surfaces or hardware required.
- Broad APT Series Coverage — Confirmed fit for APT4S Pump with Skid, APT4T Pump with Surge Brake, APT4T Pump with Electric Brake, and all corresponding cold weather variants.
- Sustained Pumping Pressure — A correctly fitted piston maintains proper displacement and pressure output; a worn or damaged piston leads to reduced flow, pressure loss, and accelerated wear on surrounding components.
- Genuine Wacker Neuson Part — Sourced directly through the Wacker Neuson OEM supply chain, ensuring part number 5200020158 matches the original specification without substitution.
The piston is the reciprocating heart of a pump's fluid-end assembly — it moves back and forth within the cylinder bore to draw in and displace fluid under pressure. In APT series transfer pumps, the piston must maintain a precise fit with the cylinder walls and associated seals to deliver consistent flow and pressure. When a piston wears, scores, or cracks, the pump loses efficiency, output pressure drops, and the surrounding seals and cylinder bore can suffer accelerated damage if the part is not replaced promptly.
Part Details
| Part Number | 5200020158 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Piston |
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.
