Overview
The ZF 4656.056.110 6 WG 160 Powershift Transmission Assembly | Complete Unit is a fully assembled, direct-replacement gearbox core designed for heavy-duty off-highway machinery. This complete unit integrates the clutch packs, planetary gear sets, and hydraulic valve body into a single, ready-to-install package. As the central power transfer component in the WG 160 series, it manages torque distribution across six forward speeds and one reverse. The SKU 4656.056.110 identifies this specific assembly variant, which is commonly paired with the 4656101037: TRANSMISSION HOUSING to form the main structural enclosure. For front-section integrity, this unit mates directly with the 4656201075: HOUS.FRONT SECT, while the 4656201035: HOUSING REAR PART seals the output end of the assembly.
Symptoms of Failure
- Delayed or harsh gear engagement: When the internal clutch packs or sprag clutches wear, operators experience a pronounced lag or jarring shift between forward and reverse ranges.
- Low hydraulic pressure and erratic shifting: A failing pump or valve body within the assembly causes pressure drops, leading to gear slippage under load or unexpected neutral conditions.
- External oil leaks at housing seams: Cracks or gasket failures in the main casing, often near the 4472239178: HOUSING REAR PART, result in visible ATF drips and reduced fluid levels.
- Unusual whining or grinding noises: Worn bearings or damaged planetary gears produce metallic sounds that intensify during acceleration or turning maneuvers.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4656.056.110 |
| Assembly Type | 6 WG 160 Powershift Transmission (Complete Unit) |
| Dry Weight (approx.) | 285 kg (628 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-tensile cast iron |
| Max Input Torque | 1,600 Nm |
| Fluid Capacity | 22 liters (ATF Dexron III) |
| OEM Reference | ZF 6 WG 160 |
Compatibility
This complete unit is engineered for the ZF WG 160 series powershift transmissions. It is directly compatible with the following ZF transmission models: WG 160, WG 180, and WG 200 (when used with the appropriate adapter housings). The assembly also fits select variants of the WG 120 and WG 150 series after verifying bell housing alignment. Always confirm the serial number range on your existing transmission before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101037 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft support |
| 4656201035 | HOUSING REAR PART | Rear housing section for output bearing retention |
| 4472239178 | HOUSING REAR PART | Alternate rear housing variant for specific models |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing mating surfaces |
| 4656301148 | FIXING PLATE | Secures internal clutch pack assemblies |
| 0636100817 | CAP SCREW | High-strength bolt for housing fastening |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for oil sump |
| 0636100803 | CAP SCREW | M12 bolt for valve body mounting |
