The Wacker Neuson 5100021612 Key is a genuine OEM component designed for the APT4S, APT4T, APT6S, APT6T, APT8S, and APT8T series self-priming trash pumps, including skid-mounted and towable configurations with surge brake, electric brake, and cold weather package variants. As a direct OEM replacement, the 5100021612 is manufactured to the same specification as the original part, ensuring proper installation and secure engagement within the drivetrain connection it serves. Whether you are servicing a standard unit or a cold weather-equipped APT model, this key is the correct replacement to restore proper operation. Confirm your model number against the fitment list before ordering to ensure compatibility.
Key Features
- Genuine OEM Specification — Manufactured to exact Wacker Neuson tolerances, ensuring the key seats and engages correctly without slipping or misfitting in the keyway.
- Drop-In Drivetrain Fit — Designed to install directly into the shaft and hub keyway on compatible APT pump models with no modification to the housing or shaft.
- Broad APT Series Coverage — Fits APT4S, APT4T, APT6S, APT6T, APT8S, and APT8T models across standard, cold weather, surge brake, and electric brake configurations.
- Torque Transfer Integrity — A correctly fitted key locks the shaft and driven component together, allowing full torque transfer; a worn or missing key causes slippage, vibration, and accelerated wear to both mating surfaces.
- Verified Part Number — Order with confidence using Wacker Neuson part number 5100021612, cross-referenced against a wide range of APT pump machine numbers.
A key is a small precision-machined component that fits into a slot — called a keyway — cut into both a rotating shaft and the hub of the component it drives, such as an impeller or coupling. By interlocking the two parts, the key transfers rotational force from the shaft to the driven component without allowing either to spin independently. When a key shears, wears, or goes missing, the shaft turns freely inside the hub, the pump loses drive, and continued operation will damage the keyway surfaces on both the shaft and the hub — turning a minor replacement job into a costly repair.
Part Details
| Part Number | 5100021612 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Key |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT6S Pump w/Skid | APT6S | 5200018982 |
| APT6T Pump, Surge Brake, Cold Weather | APT6T CW | 5200019794, 5200019795 |
| APT6T Pump, Electric Brake | APT6T | 5200019647, 5200019646 |
| APT4T Pump, Electric Brake, Cold Weather | APT4T CW | 5200019793, 5200019792 |
| APT8T Pump, Surge Brake, Cold Weather | APT8T CW | 5200019796, 5200019797 |
| APT4T Pump, Surge Brake | APT4T | 5200019643, 5200019644 |
| APT8T Pump, Surge Brake | APT8T | 5200019648, 5200019649 |
| APT6S Pump w/Skid, Cold Weather | APT6S CW | 5200019799 |
| APT4S Pump w/Skid, Cold Weather | APT4S CW | 5200019798 |
| APT8S Pump w/Skid | APT8S | 5200018987 |
| APT8S Pump w/Skid, Cold Weather | APT8S CW | 5200019800 |
| APT4S Pump w/Skid | APT4S | 5200018977 |
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.
