The Wacker Neuson Cotter Pin is a genuine OEM cotter pin designed for the APT4S and APT4T series pumps, including cold weather variants. Sourced directly from Wacker Neuson, this cotter pin matches the exact specification of the original hardware installed at the factory. It is confirmed to fit the APT4S Pump with Skid, APT4T Pump with Surge Brake, APT4T Pump with Electric Brake, and their respective cold weather editions.
Key Features
- OEM-Matched Material and Geometry — Manufactured to Wacker Neuson's original specification, ensuring the pin seats and deforms correctly on installation without risk of under-retention or over-stress.
- Drop-In Hardware Replacement — Dimensioned to the original hole and shaft clearances so it installs with standard tooling and no rework to the surrounding fastener assembly.
- Broad APT Series Coverage — Fits the full APT4S and APT4T pump lineup, including surge brake, electric brake, and cold weather configured models, so one part number covers multiple units in your fleet.
- Positive Retention When It Matters Most — A correctly installed cotter pin locks fasteners and pins in place under vibration and load; a worn or missing cotter pin allows critical connections to back out during operation.
- Brake System Hardware Compliance — Used within brake-equipped APT4T pump configurations where fastener retention is directly linked to safe trailer brake operation; using the correct OEM pin supports proper brake system integrity.
A cotter pin is a small split-pin fastener inserted through a drilled hole in a bolt, shaft, or clevis pin, then bent open to lock the assembly in place. Its job is to prevent unintended loosening or disassembly of connected components under vibration, load, or repeated movement. When a cotter pin is missing, broken, or deformed beyond reuse, the fastener or pin it secures can migrate out of position — leading to loosened linkages, misaligned components, or loss of mechanical connection at a critical point in the machine.
Part Details
| Part Number | 5200019903 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Cotter Pin |
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.
