Overview
The ZF 4646.033.001 3 WG 251 ERGOPOWER Transmission Assembly is a complete, factory-matched unit designed for heavy-duty industrial drivetrains. This assembly integrates the planetary gear set, clutch packs, and hydraulic control components into a single, pre-assembled module. As the core power transfer element in the WG 251 series, it directly manages torque distribution and gear ratio selection. The SKU 4646.033.001 is a direct replacement for worn or failed assemblies, ensuring minimal downtime during rebuilds. It sits between the torque converter and the output shaft, housed within the main TRANSMISSION HOUSING and sealed by the COVER to prevent contamination.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the assembly’s clutch discs or seals degrade, you may notice delayed shifts or a loss of torque transfer, especially during uphill pulls or heavy hauling.
- Internal hydraulic pressure loss: Worn piston rings or valve body wear within the assembly can cause low line pressure, leading to harsh shifts or complete loss of drive in specific ranges.
- Metallic debris in the oil pan: Fragments from failed bearings or planetary gears inside the assembly often contaminate the fluid, visible as glitter or sludge during oil changes.
- Audible whining or grinding noises: Damaged gear teeth or worn thrust washers produce distinct high-pitched sounds that intensify with engine RPM, indicating imminent failure of the ZF 4646.033.001 unit.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4646.033.001 |
| Assembly Type | Complete ERGOPOWER 3 WG 251 |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Housing Material | Cast Iron / Aluminum Alloy |
| Max Input Torque | 2,500 Nm |
| Fluid Capacity (internal) | 12.5 liters |
Compatibility
This assembly is engineered for the ZF WG 251 series of ERGOPOWER transmissions. It is directly compatible with models including WG180, WG200, WG210, WG251, and WG300 variants that share the same bellhousing pattern and input shaft spline count. Always verify the housing casting number—the HOUSING (part 4646301201) must match the assembly’s bolt pattern. For secure mounting, use the specified CAP SCREW torque values to avoid distortion.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101072 | TRANSMISSION HOUSING | Encloses and supports the gear assembly |
| 4646301201 | HOUSING | Secondary housing for valve body and clutch packs |
| 4646301166 | COVER | Seals the rear of the transmission assembly |
| 0636101051 | CAP SCREW | Fastens housing halves together |
| 4646201018 | COVER SHEET | Protects internal components from debris |
| 4646301277 | SCREEN SHEET | Filters hydraulic fluid in the sump |
| 4646201019 | COVER SHEET | Secondary protective shield for clutch access |
| 0730365125 | TYPE PLATE | Identification label with serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for precise housing positioning |
| 0636010216 | HEXAGON SCREW | Secures the valve body to the housing |
