Overview
The ZF 4656.073.050 3 WG 171 Powershift Transmission Assembly is a complete, factory-sealed 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 power transfer module in the WG 171 series, it replaces worn or failed internal assemblies without requiring piecemeal rebuilding. The SKU 4656.073.050 is a direct OEM reference for this complete unit, ensuring precise fitment within the transmission housing.
Symptoms of Failure
When the ZF 4656.073.050 assembly begins to fail, operators typically notice these specific issues:
- Delayed or harsh gear engagement – The transmission hesitates before engaging forward or reverse, often accompanied by a jarring shift. This points to worn clutch discs or degraded seals inside the assembly.
- Oil leaks at the housing interface – Fluid seeping from the joint between the assembly and the TRANSMISSION HOUSING indicates a compromised gasket or cracked casting.
- Gear slipping under load – The transmission loses torque during uphill travel or when pushing heavy material, a classic sign of worn clutch packs or a failing hydraulic pump within the unit.
- Unusual whining or grinding noises – Metallic sounds from the bell housing suggest bearing failure or gear tooth damage inside the assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4656.073.050 |
| Assembly Type | Complete Powershift Unit (3 WG 171) |
| Overall Length | 620 mm (24.4 in) |
| Dry Weight | 185 kg (408 lbs) |
| Housing Material | High-Strength Cast Iron |
| OEM Reference | ZF 4656.073.050 |
| Seal Kit Required | 0634313514: O-RING |
| Mounting Hardware | 0636100803: CAP SCREW (x8) |
Compatibility
This complete assembly is engineered for the ZF WG 171 series transmissions. It is also compatible with the WG 180 and WG 200 series when used with the correct HOUS.FRONT SECT adapter. The unit fits directly into the main transmission cavity and interfaces with the HOUSING REAR PART and the SCREEN SHEET for oil filtration. For proper installation, always replace the TUBE and the CYLINDRICAL PIN to ensure alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural case that encloses the assembly |
| 4656301066 | HOUS.FRONT SECT | Front section adapter for WG 180/200 compatibility |
| 4656201015 | SCREEN SHEET | Oil filter screen protecting the hydraulic circuit |
| 4656301037 | TUBE | Hydraulic fluid passage tube |
| 0634313514 | O-RING | Seal for hydraulic connections |
| 0636100803 | CAP SCREW | Mounting bolt for the assembly |
| 4656301042 | HOUSING REAR PART | Rear housing section for output shaft support |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise assembly positioning |
| 0636100801 | CAP SCREW | Secondary mounting fastener |
| 0636100160 | CAP SCREW | Flange bolt for cover plate |
Frequently Asked Questions
Q: Can the 4656.073.050 assembly be rebuilt instead of replaced?
A: While individual clutch packs and seals can be serviced, this complete unit is designed as a direct swap to minimize downtime. Rebuilding requires specialized tooling and is only recommended if the housing is undamaged.
Q: Does this assembly include the valve body?
A: No. The 4656.073.050 is the rotating gear and clutch assembly only. The valve body and hydraulic controls are separate components that must be transferred from the old unit or ordered separately.
Q: What torque specification is required for the mounting cap screws?
A: Use 120 Nm (88 lb-ft) for the 0636100803: CAP SCREW and 95 Nm (70 lb-ft) for the 0636100801: CAP SCREW. Always use new O-rings from kit 0634313514 during installation.
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