ZF 4644.323.002 PLANETARY GEAR for WG 180/WG 200 | OEM Genuine Part

Overview

The ZF 4644.323.002 PLANETARY GEAR is a critical power-distribution component engineered for the WG 180 and WG 200 series transmissions. This OEM genuine part transfers torque from the turbine shaft to the sun gear assembly, enabling smooth ratio changes under heavy load. As the central element of the planetary set, it directly influences gear engagement precision and overall drivetrain efficiency. The SKU 4644.323.002 is factory-machined to ZF’s exacting tolerances, ensuring a direct fit without modification.

Symptoms of Failure

• Erratic gear slipping under load: When the planetary gear wears, you may notice the transmission unexpectedly drops out of gear during acceleration, especially on inclines.
• Metallic grinding noise from the bell housing: A distinct whine or grinding sound that intensifies with engine RPM indicates pitting or spalling on the gear teeth.
• Delayed engagement when shifting from Neutral to Drive: Worn planetary gears cause a noticeable lag (2–4 seconds) before the transmission catches, often accompanied by a harsh clunk.
• Contaminated transmission fluid with metallic debris: Inspect the fluid for silver or bronze particles; this is a clear sign the planetary gear set is shedding material internally.

Technical Specifications

Compatibility

This planetary gear is specifically designed for ZF WG 180 and WG 200 series transmissions. It is also compatible with select variants of the WG 200 Series that share the same planetary carrier geometry. For applications in WG 180 models, verify the transmission serial number against ZF’s service bulletin to confirm the 4644.323.002 supersedes earlier revisions. The gear is not interchangeable with WG 120 or WG 150 series units.

During installation, always pair this planetary gear with the correct mounting hardware. Secure the assembly using the 0636011429 HEXAGON SCREW and a new 0730100365 WASHER to maintain proper clamping force. The gear housing must be aligned with the 4460165051 CONSOLE and the 4460368311 CONSOLE to prevent axial misalignment during operation.

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