Overview
The ZF 4656.056.070 6 WG 160 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single, ready-to-install package. As the core rotating assembly within the WG 160 series, it directly transfers engine torque to the driveline through six forward speeds and one reverse. The SKU 4656.056.070 is the definitive replacement for worn-out internal assemblies, ensuring precise gear engagement and load-holding capability in wheel loaders, dump trucks, and industrial tractors. This unit mates directly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to form a sealed, pressurized oil circuit.
Symptoms of Failure
- Delayed or harsh engagement: When the 4656.056.070 assembly wears, internal clutch piston seals degrade, causing a noticeable lag when shifting from neutral to forward or reverse. Operators may feel a violent “clunk” as the transmission catches.
- Torque converter overheating: A failing assembly often leads to excessive internal slippage, generating high heat. If the transmission temperature gauge spikes during normal loading cycles, the internal clutches or one-way sprag may be failing.
- Intermittent gear slipping under load: As the assembly loses hydraulic pressure, the transmission may momentarily lose drive power on an incline or when digging. This is often accompanied by a high-pitched whine from the pump section.
- Metallic debris in the oil pan: Worn bearings or clutch friction material from the assembly will contaminate the transmission fluid. If you find silver or bronze particles during an oil change, the internal rotating group requires immediate replacement.
Technical Specifications
| Part Number | 4656.056.070 |
| Assembly Type | Complete Powershift Transmission (6 WG 160) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 4656.056.070 / 6 WG 160 |
| Bolt Torque Spec | M16: 210 Nm (housing to bellhousing) |
Compatibility
This complete unit is engineered specifically for the ZF WG 160 series transmissions. It is directly compatible with the WG 160, WG 161, and WG 162 variants found in mid-size construction equipment. While the WG 180 and WG 200 series share similar hydraulic architecture, the 4656.056.070 is dimensionally specific to the 160-series housing. For proper installation, always verify that the HOUSING REAR PART and the HOUSING REAR PART (second variant) match your existing bellhousing pattern. This assembly is not cross-compatible with the older WG 120 series without significant adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101038 | TRANSMISSION HOUSING | Main structural case for the gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing the torque converter |
| 4656201037 | HOUSING REAR PART | Rear housing for output shaft support |
| 4472239180 | HOUSING REAR PART | Alternate rear housing variant |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing mating |
| 4656301148 | FIXING PLATE | Secures clutch pack retaining ring |
| 0636100817 | CAP SCREW | High-tensile bolt for housing flanges |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil pickup |
| 4656301017 | SCREEN SHEET | Secondary filter screen for return line |
| 0636100803 | CAP SCREW | Bolt for valve body mounting |
