The Wacker Neuson Pinion Stopper Set is a genuine OEM component designed for APT4S and APT4T series pumps, including surge brake, electric brake, and cold weather variants. As a factory-sourced part, the is manufactured to the same specifications as the original, ensuring a direct, hassle-free installation in your pump assembly. This set covers a broad range of APT pump configurations, making it the right choice whether you're servicing a standard skid-mounted APT4S or a cold weather APT4T with electric brake. Keep your pump operating as intended by replacing worn or damaged components with the correct Wacker Neuson part.
Key Features
- Genuine OEM Retention Integrity — Sourced directly from Wacker Neuson, this stopper set meets the exact material hardness and dimensional tolerances required to hold the pinion securely under load.
- Drop-In Installation — Engineered to align with existing pinion geometry in the APT pump drivetrain, so the set installs without modification or adapting surrounding components.
- Broad APT Series Coverage — Fits six distinct APT4S and APT4T configurations, including surge brake, electric brake, and cold weather variants, across both standard and skid-mounted models.
- Drivetrain Stability Under Load — A properly functioning pinion stopper set prevents unwanted axial movement in the pinion assembly, protecting the pump drivetrain from accelerated wear and misalignment during operation.
- Verified OEM Part Number — Part number 5200020255 is the factory-assigned reference for this set, so you can order with confidence that you're receiving the correct components for your machine.
The pinion stopper set controls axial movement of the pinion within the pump's drive assembly, keeping it correctly positioned during operation. Without secure retention, the pinion can shift under load, leading to uneven gear engagement, increased wear on surrounding drivetrain components, and eventual mechanical failure. Replacing a worn or compromised stopper set restores proper pinion positioning and protects the integrity of the pump's power transmission system.
Part Details
| Part Number | 5200020255 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Pinion Stopper Set |
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.
Wacker Neuson