ZF 4656.073.303 3 WG 171 Powershift Transmission Assembly | Complete Unit

Overview

This ZF 4656.073.303 3 WG 171 Powershift Transmission Assembly is a complete, fully assembled unit designed for heavy-duty industrial applications. As a core component of the WG 171 series, this assembly integrates the main gear cluster, clutch packs, and hydraulic control elements into a single, ready-to-install package. The SKU 4656.073.303 replaces worn or failed complete transmissions, restoring full power flow and shift quality in loaders, dozers, and material handlers. It sits at the heart of the driveline, directly coupling engine torque to the output shaft through a series of planetary gearsets. For maximum reliability, this assembly is designed to work with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to ensure proper alignment and sealing.

Symptoms of Failure

• Erratic or delayed gear engagement: When the internal clutch packs or seals degrade, operators experience hesitation or harsh shifts between forward and reverse, especially under load.
• Low hydraulic pressure and slipping: Worn internal components cause a drop in system pressure, leading to transmission slip during acceleration or on inclines.
• External oil leaks at housing joints: Cracks or gasket failures in the main casing allow ATF to seep out, often visible around the bell housing or output flange.
• Unusual noise during operation: Grinding or whining sounds from the gear train indicate bearing wear or gear tooth damage inside the assembly.

Technical Specifications

Compatibility

This complete unit is engineered for the ZF WG 171 series, but its design principles extend to other powershift models in the same family. It is directly compatible with WG 171, WG 180, and WG 200 transmissions found in articulated dump trucks, wheel loaders, and telehandlers. The assembly also shares mounting patterns with the HOUSING REAR PART and the SCREEN SHEET used in later WG series variants. Always verify your transmission model number before ordering.

Related Components

Frequently Asked Questions

Q: Is this a complete drop-in replacement for my WG 171 transmission?
A: Yes, the 4656.073.303 is a fully assembled unit that includes all internal gears, clutches, and seals. It replaces the entire transmission core and requires only the external housing and front section to be installed.

Q: What other parts should I replace during installation?
A: We strongly recommend installing a new O-RING and SCREEN SHEET to prevent contamination. Also inspect the TUBE for blockages.

Q: Does this assembly work with the WG 200 series?
A: It is physically compatible with WG 180 and WG 200 housings, but you must verify the input spline count and bell housing bolt pattern from your original unit.