The Wacker Neuson Spring is a genuine OEM Spring designed for the APT4S and APT4T series towable water pumps. As a factory-sourced component, this spring is built to the exact tolerances and specifications used in original production, ensuring proper tensioning and mechanical response across all covered configurations. It is confirmed to fit both standard and Cold Weather variants of the APT4S and APT4T, including surge brake and electric brake models. Keeping the correct spring in place is essential to maintaining consistent mechanical function and protecting adjacent pump components from undue stress.
Key Features
- OEM Tensioning Precision — Manufactured to the exact load and deflection characteristics of the original production spring, maintaining consistent mechanical response under operating conditions.
- Drop-In Installation — Engineered to match the original mounting geometry exactly, so it installs directly into the existing spring seat without rework or adjustment.
- Broad APT Series Coverage — Fits APT4S Pump with Skid and APT4T Pump models, including surge brake, electric brake, and Cold Weather configurations across both series.
- Protects Surrounding Components — A correctly tensioned spring prevents excess mechanical play that can accelerate wear on connected parts, helping the pump maintain its designed operating behavior.
- Brake System Integrity — On surge brake and electric brake APT4T models, proper spring function is directly linked to correct brake actuation; a worn or broken spring can compromise towing brake performance and trailer safety compliance.
A spring in a towable pump assembly serves as a critical mechanical element that stores and releases energy to maintain controlled movement, return force, or tension within the mechanism it supports. When a spring weakens, takes a set, or breaks entirely, connected components lose their intended operating position, which can result in erratic function, increased wear on mating parts, or failure of linked systems such as the brake actuation mechanism. Replacing a fatigued spring promptly with the correct OEM part restores the designed mechanical behavior and prevents secondary damage to the assembly.
Part Details
| Part Number | 5200020186 |
|---|---|
| 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.
