Overview
The ZF 4657.056.139 6 WG 210 Powershift Transmission Assembly | Complete Unit is a fully assembled, ready-to-install gearbox core designed for heavy-duty off-highway machinery. This complete unit integrates the main drive housing, clutch packs, and hydraulic valve body into a single, pre-tested assembly. As the central power transfer component in the WG 210 series, it directly replaces worn or failed transmissions in wheel loaders, graders, and industrial tractors. The SKU 4657.056.139 denotes a factory-spec unit that includes the TRANSMISSION HOUSING as its structural base, ensuring precise alignment of all internal shafts and planetary gears.
Symptoms of Failure
- Delayed or harsh engagement: When the assembly wears, hydraulic pressure drops, causing a noticeable lag or jarring shift when moving from neutral to forward or reverse.
- Oil leaks at the housing seams: Cracks or gasket failures in the HOUS.FRONT SECT or HOUSING REAR PART allow transmission fluid to escape, leading to low oil levels and eventual gear slipping.
- Intermittent power loss under load: Worn clutch discs or a damaged HOUSING REAR SECTION can cause the transmission to lose torque during heavy digging or climbing, often accompanied by a burning smell.
- Unusual whining or grinding noises: Bearing failure inside the complete unit produces a metallic sound that intensifies with engine RPM, indicating imminent internal damage.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.056.139 |
| Assembly Type | Complete Powershift Transmission |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 6 WG 210 |
| Max Input Torque | 2100 Nm |
Compatibility
This complete unit is engineered specifically for the ZF WG 210 series of powershift transmissions. It is directly compatible with models including the WG180, WG200, and WG210, which are commonly found in articulated dump trucks, motor graders, and telescopic handlers. The assembly also fits select variants of the ZF 6WG series used in agricultural tractors. For proper installation, ensure the CYLINDRICAL PIN and CAP SCREW fasteners are replaced with new hardware to maintain torque specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear and shaft alignment |
| 4657201166 | HOUS.FRONT SECT | Front section housing input shaft and pump drive |
| 4657201170 | HOUSING REAR PART | Rear casing supporting output shaft and PTO |
| 4657298102 | HOUSING REAR SECTION | Extended rear section for additional gear sets |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M12 bolt for securing housing sections |
| 4656301148 | FIXING PLATE | Locking plate for clutch pack retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic oil circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump return line |
| 0636100803 | CAP SCREW | M16 bolt for heavy-duty flange connections |
