The Wacker Neuson 5100021681 is a genuine OEM Control Module designed for the APT-series self-priming centrifugal trash pump lineup, covering APT4T, APT4S, APT6T, APT6S, APT8T, and APT8S models in both standard and Cold Weather configurations. As a factory-sourced component, the 5100021681 meets the exact electrical and operational specifications Wacker Neuson engineers to for this pump family — including surge brake, electric brake, and skid-mount variants. Fitment extends across the full APT range, making this a versatile control replacement for contractors running multiple pump sizes on a single job. Verify your model number before ordering to confirm the correct configuration for your unit.
Key Features
- Genuine OEM Electrical Specification — Manufactured to the exact output and signal tolerances Wacker Neuson specifies for the APT-series pump control system, ensuring the module communicates correctly with pump electronics.
- Drop-In Replacement — Matches the original connector layout and mounting configuration, allowing direct installation without rewiring or bracket modification.
- Broad APT-Series Compatibility — Fits APT4T, APT4S, APT6T, APT6S, APT8T, and APT8S pumps across surge brake, electric brake, skid-mount, and Cold Weather variants.
- Pump Operation Restored — A failed control module can prevent the pump from starting, interrupt brake control, or cause erratic operation; replacing it with part 5100021681 restores full, predictable pump function.
- Brake System Integrity — For trailer-mounted APT models with surge or electric brake systems, correct module function is critical to safe towing compliance and braking response.
The control module is the electronic brain governing pump operation and, on trailer-mounted APT models, the brake control interface. It processes input signals and sends commands that regulate pump start, run, and shutdown sequences, as well as communicating braking commands to surge or electric brake systems on tow-behind configurations. When the module fails, symptoms can range from a pump that will not start to unpredictable shutdowns or non-responsive brake systems — all of which take a pump out of service. Replacing a faulty module with a genuine OEM unit like the 5100021681 brings the pump back to its original operating logic.
Part Details
| Part Number | 5100021681 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Control Module |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT6T Pump, Surge Brake | APT6T | 5200019646, 5200019647 |
| APT6T Pump, Electric Brake, Cold Weather | APT6T CW | 5200019795, 5200019794 |
| APT6S Pump w/Skid | APT6S | 5200018982 |
| APT8T Pump, Electric Brake, Cold Weather | APT8T CW | 5200019797, 5200019796 |
| APT8S Pump w/Skid, Cold Weather | APT8S CW | 5200019800 |
| APT4T Pump, Surge Brake, Cold Weather | APT4T CW | 5200019792, 5200019793 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
| APT4S Pump w/Skid | APT4S | 5200018977 |
| APT8T Pump, Electric Brake | APT8T | 5200019649, 5200019648 |
| APT4T Pump, Surge Brake | APT4T | 5200019643, 5200019644 |
| APT6S Pump w/Skid, Cold Weather | APT6S CW | 5200019799 |
| APT8S Pump w/Skid | APT8S | 5200018987 |
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.
