The Wacker Neuson 5200019852 Gear Case Complete is a genuine OEM component designed for the APT4T and APT4S series self-priming pumps. As a direct factory replacement, this gear case assembly restores the drive interface between the motor and pump end, ensuring correct power transmission and pump output. It is compatible with multiple APT4T and APT4S configurations, including Electric Brake, Surge Brake, and Cold Weather variants, making it the correct choice across the full APT4-series pump lineup. Sourcing a genuine OEM part means the 5200019852 is manufactured to the same tolerances and material specifications as the original, so you can reinstall with confidence.
Key Features
- OEM-Grade Housing Integrity — Manufactured to Wacker Neuson's original dimensional tolerances, ensuring the gear set seats and meshes correctly without adjustment.
- Complete Assembly — Supplied as a full gear case assembly, ready to install as a drop-in replacement for the original unit on APT4T and APT4S pumps.
- Broad APT4-Series Fitment — Confirmed fit across APT4T Electric Brake, APT4T Surge Brake, APT4S with Skid, and all corresponding Cold Weather variants.
- Restores Full Pump Performance — A worn or cracked gear case allows misalignment of internal drive components, leading to power loss, fluid ingress, and eventual pump failure; replacing it returns the pump to full rated output.
- Genuine Wacker Neuson OEM Part — Supplied under part number 5200019852 direct from the Wacker Neuson parts program, with no substitutions or rebranded alternatives.
The gear case on an APT4T or APT4S pump serves as the structural housing that encloses and aligns the drive gears connecting the power source to the pump impeller shaft. It bears the mechanical loads generated during pump operation and keeps the internal gear set properly aligned and lubricated. When the gear case cracks, warps, or its bearing bores wear out of spec, drive efficiency drops, vibration increases, and the pump can lose prime or fail to deliver rated flow — making timely replacement critical to keeping the unit operational.
Part Details
| Part Number | 5200019852 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Gear Case Complete |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| APT4T Pump, Electric Brake | APT4T | 5200019644, 5200019643 |
| APT4S Pump w/Skid | APT4S | 5200018977 |
| 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.
