The Wacker Neuson Spring is a genuine OEM Spring designed for the APT4S and APT4T pump series, including surge brake, electric brake, and cold weather variants. As a direct OEM replacement, this spring is manufactured to the same specifications as the original part, ensuring correct tension, sizing, and fitment right out of the box. It covers the full range of APT4S and APT4T configurations, making it the reliable choice for technicians and operators servicing these trailer-mounted water pump units.
Key Features
- OEM Tension and Geometry — Manufactured to the exact spring rate and dimensions of the original, ensuring the component delivers consistent force and return travel within the pump assembly.
- Drop-In Fitment Across APT4S and APT4T Variants — Confirmed for surge brake, electric brake, and cold weather configurations, so you order once with confidence regardless of your specific model build.
- Broad Model Coverage — Compatible with APT4S Pump with Skid, APT4T Pump with Surge Brake, APT4T Pump with Electric Brake, and all corresponding Cold Weather editions.
- Maintains Proper Mechanism Operation — A correctly functioning spring keeps pump and brake components returning to their intended position under load; a worn or broken spring leads to sluggish response, misalignment, or mechanism failure.
- Brake System Integrity — On surge and electric brake models, spring function is directly tied to brake engagement and release behavior, making correct spring specification a genuine safety consideration during service.
A spring in a trailer-mounted pump assembly serves as the return or tension element that holds moving components in their correct operating position and restores them after actuation. In brake-equipped pump units like the APT4T, the spring plays a direct role in how the brake mechanism engages and releases — if the spring loses tension, cracks, or breaks, the mechanism may not return properly, compromising both pump operation and braking performance. Replacing a fatigued or failed spring with the correct OEM part restores the intended mechanical behavior and keeps the system working as designed.
Part Details
| Part Number | 5200020159 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | 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.
