The Wacker Neuson Valve Spring is a genuine OEM component designed for the APT4S and APT4T series pumps, including standard, surge brake, electric brake, and cold weather configurations. As a direct OEM replacement, this part is manufactured to the exact specifications required by these pump assemblies, ensuring correct tension and valve operation right out of the box. Compatible across six distinct APT4S and APT4T configurations, the is the correct part whether you're servicing a skid-mounted unit or a cold weather variant with surge or electric brake.
Key Features
- OEM-Calibrated Spring Tension — Manufactured to the precise load rating required for proper valve actuation in Wacker Neuson APT-series pump assemblies.
- Drop-In Valve Seat Compatibility — Engineered to seat correctly within the valve assembly without shimming or adjustment, maintaining correct preload from installation.
- Broad APT Series Coverage — Fits APT4S and APT4T configurations including surge brake, electric brake, skid-mounted, and cold weather variants.
- Sustained Pump Pressure Integrity — A correctly functioning valve spring maintains consistent valve closure, preserving pump output pressure and flow rate across operating cycles.
- Genuine Wacker Neuson Part — Sourced directly from Wacker Neuson, part number 5200019899 carries the same quality standard as the original component installed at the factory.
The valve spring applies the mechanical force needed to return a valve to its closed position after each actuation cycle within the pump. In a water pump application, this consistent closing action is critical to maintaining proper flow direction and preventing backflow or pressure loss. When a valve spring weakens, cracks, or loses tension, pump output becomes erratic, efficiency drops, and internal valve components can suffer accelerated wear from incomplete seating.
Part Details
| Part Number | 5200019899 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Valve Spring |
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.
