Overview
The ZF 4656.056.104 6 WG 160 Powershift Transmission Assembly | Complete Unit is a fully assembled, ready-to-install gearbox core designed for heavy-duty off-highway machinery. As the central power transfer module in the WG 160 series, this complete unit integrates the main drive shaft, clutch packs, and planetary gear sets within a sealed housing. The SKU 4656.056.104 identifies a factory-grade replacement that eliminates the need for piecemeal rebuilding, ensuring precise gear engagement under high torque loads. This assembly sits between the engine flywheel and the final drive, converting rotational power into controlled forward and reverse motion for wheel loaders, graders, and industrial tractors.
Symptoms of Failure
When the ZF 4656.056.104 assembly begins to fail, operators typically notice these specific warning signs:
- Delayed or harsh gear engagement – A noticeable lag when shifting from neutral to forward or reverse, often accompanied by a clunking sound, indicating worn clutch discs or hydraulic pressure loss inside the unit.
- Transmission fluid leaks at the housing seams – Oil weeping from the joint between the TRANSMISSION HOUSING and the HOUS.FRONT SECT suggests gasket failure or housing cracks, leading to low fluid levels and overheating.
- Intermittent power loss under load – The machine struggles to maintain speed when climbing or digging, often caused by slipping clutches or a damaged HOUSING REAR PART that misaligns the output shaft.
- Unusual whining or grinding noises – High-pitched sounds from the gear train point to bearing wear or debris contamination, frequently traced back to a compromised HOUSING REAR PART that allows foreign particles into the oil circuit.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4656.056.104 |
| Assembly Type | Complete Powershift Transmission Unit |
| 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 6 WG 160 |
| Input Torque Capacity | 1,600 Nm (1,180 lb-ft) |
| Number of Speeds | 6 Forward / 3 Reverse |
| Oil Capacity | 22 liters (5.8 gallons) |
Compatibility
This complete unit is engineered for the ZF WG 160 series powershift transmissions. It is directly compatible with models including the WG 160, WG 180, and WG 200, which are commonly found in articulated dump trucks, wheel loaders, and telescopic handlers from manufacturers such as Volvo, Liebherr, and JCB. The assembly also fits select WG 120 and WG 250 variants when used with the appropriate adapter plate, though the primary application remains the 6-speed WG 160 platform.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101038 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train and oil sump. |
| 4656201075 | HOUS.FRONT SECT | Front section housing the input shaft and torque converter interface. |
| 4656201037 | HOUSING REAR PART | Rear casing supporting the output shaft and PTO drive. |
| 4472239180 | HOUSING REAR PART | Alternate rear housing variant for specific WG 160 sub-models. |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise housing assembly. |
| 4656301148 | FIXING PLATE | Retains clutch pack components within the drum. |
| 0636100817 | CAP SCREW | High-tensile bolt for securing housing flanges. |
| 4656301016 | SCREEN SHEET | Fine mesh filter for the oil intake circuit. |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for the hydraulic pump. |
| 0636100803 | CAP SCREW | Bolt for mounting the valve body to the housing. |
