ZF 4644.004.221 GETRIEBE for WG180 | OEM Genuine Part

Overview

The ZF 4644.004.221 GETRIEBE is a critical internal gear assembly engineered specifically for the ZF WG 180 series powershift transmission. This OEM genuine part functions as the primary torque transfer mechanism within the planetary gear set, converting hydraulic motor input into precise mechanical output for heavy-duty off-highway vehicles. The SKU 4644.004.221 sits directly within the main transmission housing, interfacing with the clutch packs and output shaft to ensure smooth gear engagement under extreme load conditions. As a factory-original component, it guarantees exact fitment and OEM-specified durability for your WG180 rebuild or repair.

Symptoms of Failure

When the ZF 4644.004.221 GETRIEBE begins to wear, operators often notice erratic gear engagement during low-speed maneuvering, a common long-tail search query for WG180 transmission issues. Another frequent symptom is metallic grinding noises from the transmission bell housing when shifting between forward and reverse, indicating gear tooth damage. You may also experience intermittent loss of drive power under heavy load, particularly when climbing grades, which points to worn gear splines. Finally, contaminated transmission fluid with visible metal particles is a definitive sign that this gear assembly requires immediate replacement to prevent cascading damage to the 4644101223: TRANSMISSION HOUSING or the 4644301225: TRANSMISSION HOUSING.

Technical Specifications

Compatibility

This ZF 4644.004.221 GETRIEBE is primarily designed for the ZF WG 180 series transmission, commonly found in articulated dump trucks, wheel loaders, and graders from manufacturers like Liebherr, Volvo, and Caterpillar. It is also compatible with the ZF WG 200 series in certain applications where the gear ratio matches, though cross-referencing with your transmission serial number is recommended. The part interfaces directly with the 0730365125: TYPE PLATE for identification and the 4644301298: COVER PLATE for sealing. For complete assembly, ensure you also inspect the 0634306525: O-RING and 0636305026: SCREW PLUG during installation.

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