Overview
The ZF 4656.056.103 6 WG 160 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in replacement for heavy-duty off-highway applications. This complete unit integrates the main gear cluster, clutch packs, and hydraulic control system into a single, pre-tested assembly. Designed for the WG 160 series, this SKU (4656.056.103) serves as the core power transfer module, converting engine torque into controlled wheel or implement motion. It is typically mounted between the engine bell housing and the final drive, requiring precise alignment with the 4656101057: TRANSMISSION HOUSING to ensure structural integrity and oil sealing.
Symptoms of Failure
When the ZF 4656.056.103 assembly begins to degrade, operators will notice distinct operational issues. Look for these specific failure symptoms to diagnose a worn unit:
- Erratic gear engagement or slipping under load: The transmission hesitates or fails to hold a gear when climbing grades or moving heavy loads, often accompanied by a burning clutch smell.
- External oil leaks at the housing seam: Hydraulic fluid weeping from the joint between the main assembly and the 4656201075: HOUS.FRONT SECT indicates seal failure or case distortion.
- Delayed or harsh shifting: A noticeable lag between shifting the lever and the actual gear change, or a violent “clunk” during engagement, points to internal wear in the valve body or planetary sets.
- Unusual whining or grinding noise: A high-pitched whine from the center of the unit, especially in neutral, suggests bearing failure or gear tooth damage within the assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4656.056.103 |
| Assembly Type | 6 WG 160 Powershift (Complete Unit) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 480 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Max Input Torque | 1,600 Nm |
| OEM Reference | ZF 1320 301 001 |
Compatibility
This complete unit is specifically engineered for the WG 160 transmission series. While the core assembly is unique to the WG 160, it shares mounting patterns and hydraulic interfaces with the larger WG 180 and WG 200 series when used with the correct adapter plates. It is a direct fit for ZF 6 WG 160 models used in telescopic handlers, wheel loaders, and agricultural tractors from 2015 onward. For proper installation, ensure the 4656201078: HOUSING REAR PART and the 4656298050: HOUSING REAR SECTION are inspected for wear, as they directly mate to this assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101057 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4656201075 | HOUS.FRONT SECT | Front section housing input shaft and pump drive |
| 4656201078 | HOUSING REAR PART | Rear casing supporting output shaft and PTO |
| 4656298050 | HOUSING REAR SECTION | Extended rear section for additional gear reduction |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 4656301148 | FIXING PLATE | Locks bearing and gear positions on the shaft |
| 0636100817 | CAP SCREW | High-tensile bolt for housing flange clamping |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic oil return line |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for suction line |
| 0636100803 | CAP SCREW | M12 bolt for securing the rear cover plate |
