Overview
The ZF 4657.056.121 6 WG 210 Powershift Transmission Assembly | Complete Unit is a fully integrated drop-in replacement for heavy-duty powershift drivelines. This complete assembly serves as the central torque-converter and gearbox unit in ZF’s WG 210 series, managing power distribution from the engine to the final drive. The SKU 4657.056.121 includes all internal clutches, planetary gearsets, and hydraulic control valves pre-assembled within a sealed housing. It is designed to be mounted directly between the engine bellhousing and the output transfer case, eliminating the need for piecemeal component sourcing. For maximum structural integrity, this unit mates with the 4657101082: TRANSMISSION HOUSING and the 4657201166: HOUS.FRONT SECT to form a rigid driveline backbone.
Symptoms of Failure
- Delayed or harsh gear engagement – When the complete unit wears internally, hydraulic pressure drops cause a noticeable lag or clunk when shifting from neutral to forward or reverse.
- Oil leaks at the housing split lines – Fatigue in the main casing leads to fluid weeping between the 4657201170: HOUSING REAR PART and the front section, often mistaken for a simple seal failure.
- Torque converter shudder under load – Internal clutch pack wear within the assembly produces a vibration during acceleration, especially at low RPMs in higher gears.
- Erratic shifting or gear slipping – Worn valve body components inside the unit cause the transmission to hunt for gears or momentarily lose power delivery during operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.056.121 |
| Assembly Type | Complete Powershift Unit (6 WG 210) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 480 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 4657.056.121 |
| Torque Capacity | 2,100 Nm (1,549 lb-ft) |
| Fluid Capacity | 22 liters (5.8 gallons) |
Compatibility
This complete assembly is engineered for the ZF WG 210 series powershift transmissions. It is directly compatible with the following ZF models: WG180, WG200, WG210, and WG250 variants used in construction, agricultural, and material handling equipment. The unit also integrates with the 4657298102: HOUSING REAR SECTION for extended driveline configurations. Always verify your transmission serial number against the OEM parts catalog before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201170 | HOUSING REAR PART | Rear casing section for output support |
| 4657298102 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636100801 | CAP SCREW | Fastener for housing joint |
| 4656301148 | FIXING PLATE | Locking plate for clutch pack retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for oil sump |
| 0636100803 | CAP SCREW | High-torque fastener for rear housing |
