ZF 4644.004.030 4 WG 180(500) Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4644.004.030 4 WG 180(500) Powershift Transmission Assembly is a complete, fully assembled unit designed for heavy-duty off-highway machinery. This SKU 4644.004.030 serves as the core power transfer module within the WG 180 series, integrating the torque converter, planetary gear sets, and clutch packs into a single, ready-to-install package. It sits directly between the engine flywheel housing and the output driveline, managing all forward and reverse gear ratios. For proper sealing and structural integrity, this assembly is paired with a 4644101080: TRANSMISSION HOUSING and a 4644301333: HOUSING to enclose the rotating components.

Symptoms of Failure

• Delayed or harsh gear engagement – When the internal clutch packs wear, operators experience a noticeable lag or a jarring shift when moving from neutral to drive or reverse.
• Erratic shifting under load – The transmission may hunt for gears or slip unexpectedly when the vehicle is climbing or carrying a heavy load, indicating worn seals or valve body issues.
• External oil seepage at the bell housing – Leaks often develop around the main gasket or the 0631311009: GROOVED STUD locations, leaving visible puddles of ATF under the machine.
• Overheating during normal operation – A failing torque converter or blocked internal passages cause the transmission to run hot, triggering warning lights on the dashboard.

Technical Specifications

Compatibility

This complete unit is engineered specifically for the ZF WG 180 series, including the 4 WG 180(500) variant. It is also compatible with the WG 200 series when used with the appropriate adapter housings. The assembly is commonly found in telescopic handlers, wheel loaders, and industrial forklifts from manufacturers such as Manitou, JCB, and Dieci. Always verify the 0730365125: TYPE PLATE on your existing unit to confirm exact fitment before installation.

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