Overview
The ZF 4656.056.072 6 WG 160 Powershift Transmission Assembly | Complete Unit is a fully assembled, direct-replacement gearbox core designed for heavy-duty industrial applications. This complete unit integrates the main drive housing, clutch packs, and hydraulic control system 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 4656.056.072 identifies this as a factory-spec assembly, ensuring seamless integration with existing drivelines. The unit mounts directly to the TRANSMISSION HOUSING and interfaces with the HOUS.FRONT SECT to form the primary structural backbone of the powertrain.
Symptoms of Failure
When the ZF 4656.056.072 assembly begins to degrade, operators typically notice these specific failure modes:
- Delayed engagement or gear slipping under load – Worn clutch discs or degraded seals within the assembly cause hesitation when shifting from neutral to drive, particularly during uphill starts.
- External oil leaks at the housing joint – Cracks in the HOUSING REAR PART or gasket failure allow transmission fluid to weep, leading to low pressure and eventual overheating.
- Erratic shift patterns or harsh engagement – Contaminated hydraulic fluid or a failing valve body inside the assembly produces jarring shifts and inconsistent speed changes.
- Metallic grinding noise during operation – Bearing failure or gear tooth damage within the complete unit generates a distinct grinding sound, especially in lower gears.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4656.056.072 |
| Assembly Type | Complete Powershift Unit (6 WG 160) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Primary Material | High-grade cast iron housing with steel alloy internals |
| OEM Reference | ZF 6 WG 160 Series |
| Torque Capacity | 1,600 Nm (1,180 lb-ft) |
Compatibility
This ZF 4656.056.072 assembly is engineered for the WG 160 transmission series. It is directly compatible with the following ZF models and their derivatives:
- ZF WG 160 (all sub-variants)
- ZF WG 180 (with adapter plate modifications)
- ZF WG 200 (limited compatibility; verify bell housing fitment)
- ZF WG 120 (requires additional hydraulic line changes)
For proper installation, the assembly must be paired with a serviceable HOUSING REAR PART to ensure correct alignment of the output shaft.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101038 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4656201075 | HOUS.FRONT SECT | Front section housing for input shaft and pump drive |
| 4656201037 | HOUSING REAR PART | Rear casing section for output bearing support |
| 4472239180 | HOUSING REAR PART | Alternate rear housing variant for specific torque converters |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing-to-housing mating |
| 4656301148 | FIXING PLATE | Retention plate for clutch pack preload |
| 0636100817 | CAP SCREW | High-tensile fastener for housing bolts |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic oil circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for sump pickup |
| 0636100803 | CAP SCREW | M12 bolt for valve body attachment |
