ZF 4644.036.058 6 WG 201 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4644.036.058 6 WG 201 Powershift Transmission Assembly is a complete, factory-engineered unit designed for heavy-duty off-highway applications. This assembly serves as the central power transfer module within the WG 201 series, integrating the torque converter, planetary gear sets, and clutch packs into a single, ready-to-install package. As a complete unit, the SKU 4644.036.058 eliminates the need for piecemeal rebuilding, ensuring precise gear engagement and hydraulic pressure integrity across all six forward speeds. It sits directly between the engine flywheel housing and the final drive, managing torque distribution under extreme load conditions. This assembly is critical for maintaining operational uptime in construction, mining, and agricultural machinery.

Symptoms of Failure

When the ZF 4644.036.058 assembly begins to degrade, operators typically notice several distinct failure modes. Delayed or harsh engagement between forward and reverse gears is a primary indicator, often caused by internal clutch pack wear or hydraulic circuit degradation. Intermittent gear slipping under load—where the transmission loses torque during uphill climbs or heavy digging—signals that the planetary gear sets or sprags are failing. External oil leaks at the housing seams are common, particularly around the TRANSMISSION HOUSING and the TRANSMISSION HOUSING interface points. Finally, unusual metallic grinding noises from the bell housing area often indicate bearing failure or debris contamination within the assembly, requiring immediate replacement to avoid catastrophic damage.

Technical Specifications

Compatibility

This complete assembly is engineered specifically for the ZF WG 201 transmission series. It is directly compatible with the 6 WG 201 model designation, which is widely used in wheel loaders, telehandlers, and dump trucks from manufacturers such as Liebherr, JCB, and Caterpillar. While the primary fitment is the WG 201, the internal architecture shares hydraulic and mechanical interfaces with the WG 180 and WG 200 series, though physical mounting dimensions may vary. Always verify the bell housing pattern and input shaft spline count against your original unit. For installations requiring a new housing, consider the TRANSMISSION HOUSING (4644101172) or the alternative TRANSMISSION HOUSING (4644301390) for specific casting revisions.

Related Components

To complete a full overhaul or service of your ZF 6 WG 201 assembly, the following parts are commonly ordered alongside the 4644.036.058 unit. These components ensure proper sealing, mounting, and identification of the transmission.