Overview
The ZF 4656.056.069 6 WG 160 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in ready drivetrain component designed for heavy-duty off-highway machinery. This complete unit integrates the main gear cluster, clutch packs, and hydraulic control system within a single robust housing. As a core assembly in the WG 160 Series, it is responsible for transmitting engine torque through six forward speeds and one reverse, enabling smooth power shifts under load. The SKU 4656.056.069 identifies this as a factory-spec complete unit, eliminating the need for piecemeal rebuilding. The assembly interfaces directly with the TRANSMISSION HOUSING to form the structural backbone of the gearbox.
Symptoms of Failure
- Delayed or harsh gear engagement: When the complete unit wears, internal clutch clearance increases, causing a noticeable lag or “clunk” when shifting from neutral to drive.
- Loss of forward or reverse drive: A failing assembly often results in one direction becoming weak or completely inoperative due to worn sealing rings or piston damage.
- Contaminated transmission fluid with metallic debris: As gears and bearings degrade, fine metal particles appear in the oil, often accompanied by a burnt smell from overheated clutches.
- Erratic shifting under load: The unit may slip or hunt between gears when the machine is under heavy load, indicating hydraulic pressure loss within the assembly.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4656.056.069 |
| Assembly Type | Complete Powershift Transmission Unit |
| Series | WG 160 |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 520 mm |
| Housing Material | High-grade cast iron |
| OEM Reference | ZF 6 WG 160 |
| Number of Speeds | 6 Forward / 1 Reverse |
Compatibility
This complete unit is engineered specifically for the ZF WG 160 Series transmission family. It is directly compatible with models including the WG 160, WG 180, and WG 200 when used as a direct replacement for the main gear assembly. The unit also fits select WG 120 variants that share the same bellhousing pattern and input shaft spline count. For proper installation, ensure the HOUS.FRONT SECT and HOUSING REAR PART are inspected for wear, as these components seal the assembly. In some configurations, the HOUSING REAR PART (alternate variant) may be required for specific torque converter applications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing the input shaft and pump drive |
| 4656201035 | HOUSING REAR PART | Rear casing supporting output shaft and PTO |
| 4472239178 | HOUSING REAR PART | Alternate rear housing for specific WG 160 builds |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing dowel locations |
| 4656301148 | FIXING PLATE | Secures clutch piston assembly in place |
| 0636100817 | CAP SCREW | High-tensile fastener for housing joints |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4656301017 | SCREEN SHEET | Alternate mesh filter for high-flow applications |
| 0636100803 | CAP SCREW | Fastener for valve body mounting |
