Overview
The ZF 4657.056.078 6 WG 210 Powershift Transmission Assembly is a complete, fully assembled unit designed for heavy-duty industrial applications. This core assembly integrates the main gear train, clutch packs, and hydraulic control system within a single robust package. As a direct replacement for the WG 210 series, the SKU 4657.056.078 ensures seamless integration into existing powertrains. It sits as the central power transfer module, converting engine torque into controlled, multi-speed output for wheel loaders, forklifts, and construction machinery. When rebuilding a transmission, this assembly is often paired with the TRANSMISSION HOUSING to ensure structural integrity and proper alignment of internal components.
Symptoms of Failure
- Delayed or harsh engagement: When the assembly wears, operators may notice a significant lag between shifting and gear engagement, often accompanied by a jarring clunk. This indicates internal clutch pack or seal degradation.
- Erratic shifting under load: The transmission may unexpectedly drop out of gear or fail to upshift when the machine is under heavy load, a classic sign of hydraulic pressure loss within the assembly.
- External oil leaks at the housing interface: Visible oil seepage around the mating surfaces of the HOUS.FRONT SECT or the HOUSING REAR PART indicates gasket or seal failure, requiring immediate attention to prevent contamination.
- Increased operating temperature: A sudden rise in transmission fluid temperature, combined with slipping, suggests internal friction damage or blocked oil passages within the assembly.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.056.078 |
| Assembly Type | Complete Powershift Unit (6 WG 210) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Primary Material | Cast Iron Housing with Steel Gears |
| OEM Reference | ZF 4657.056.078 |
| Torque Capacity | 2100 Nm (estimated) |
| Number of Speeds | 6 Forward / 3 Reverse |
Compatibility
This complete unit is specifically engineered for the ZF WG 210 series of powershift transmissions. It is directly compatible with models including the WG 180, WG 200, and WG 210. The assembly is commonly found in ZF 6WG210, 6WG200, and 6WG180 drivelines used in heavy equipment. For precise fitment, verify your transmission model number against the SKU 4657.056.078. The assembly relies on precision alignment components such as the CYLINDRICAL PIN to locate the housing sections during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201027 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201012 | HOUSING REAR PART | Rear section for output shaft support |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636100801 | CAP SCREW | Fastener for housing sections |
| 4656301148 | FIXING PLATE | Secures internal components |
| 4657301032 | SCREEN SHEET | Filter screen for hydraulic circuit |
| 4657301033 | SCREEN SHEET | Secondary filter screen |
| 0636100803 | CAP SCREW | High-strength fastener |
| 4681301040 | OIL FEED.HOUSG. | Oil supply housing for lubrication |
