The Wacker Neuson 5200021638 is a genuine OEM Lock Washer designed for the APT8S and APT8T pump series. This includes the APT8S Pump with Skid, APT8T Pump with Electric Brake, APT8T Pump with Surge Brake, and all corresponding Cold Weather variants. As a factory-sourced component, the 5200021638 is manufactured to the exact tolerances required for proper fastener retention in these pump assemblies, ensuring a secure, rattle-free connection every time. Whether you are servicing a standard configuration or a cold-weather-equipped unit, this lock washer covers the full APT8 pump lineup.
Key Features
- Genuine OEM Bite and Hold: — Manufactured to Wacker Neuson's exact tooth profile and hardness spec, ensuring the washer bites into the mating surface and holds fastener tension through vibration and load cycles common in pump operation.
- Drop-In Hardware Replacement: — Matches the original washer's inner diameter, outer diameter, and thread engagement, so it seats correctly against the fastener and mounting surface without adjustment.
- Full APT8 Series Coverage: — Confirmed fitment across APT8S Pump with Skid, APT8T Pump with Electric Brake, APT8T Pump with Surge Brake, and all Cold Weather variants of each configuration.
- Prevents Fastener Back-Out: — A correctly installed lock washer maintains clamping force under the vibration and pressure cycles inherent to self-priming pump operation, preventing loosening that could lead to leaks or structural failure at the fastener joint.
- Verified OEM Part Number: — Cross-referenced directly to Wacker Neuson part number 5200021638, so you can order with confidence that you are receiving the exact component specified for your machine.
A lock washer is a hardened fastening component placed beneath a bolt or nut to resist loosening caused by vibration, torque fluctuation, and dynamic loading. In pump assemblies like the APT8S and APT8T, where the drive system and fluid handling components generate continuous movement, fasteners are under constant stress that can cause standard hardware to back out over time. A worn or missing lock washer compromises joint integrity, which can result in loose components, fluid leaks at connections, or structural damage to pump housings and mounting brackets. Replacing it with the correct OEM part restores the clamping integrity the assembly was engineered to maintain.
Part Details
| Part Number | 5200021638 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Lock Washer |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT8S Pump w/Skid | APT8S | 5200018987 |
| APT8T Pump, Electric Brake | APT8T | 5200019649, 5200019648 |
| APT8S Pump w/Skid, Cold Weather | APT8S CW | 5200019800 |
| APT8T Pump, Electric Brake, Cold Weather | APT8T CW | 5200019797, 5200019796 |
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.
