ZF 4657.066.002 6 WG 211 Powershift Transmission Assembly | Complete Unit

Overview

The ZF 4657.066.002 6 WG 211 Powershift Transmission Assembly is a complete, factory-grade unit designed for heavy-duty off-highway machinery. This assembly integrates the full clutch pack, planetary gear sets, and hydraulic control system within the WG 211 series housing. As a direct replacement for worn or failed transmissions, the SKU 4657.066.002 ensures seamless integration with existing drivelines. It is the core component that manages torque distribution and gear ratio changes under load, making it critical for loaders, graders, and industrial vehicles requiring constant power flow.

Symptoms of Failure

• Delayed or harsh engagement: When the transmission hesitates before moving or slams into gear, internal clutch pack wear or hydraulic pressure loss is likely. This often points to a failing 4657120005: PRESSURE REGULATOR.
• Oil leaks around the bell housing or output shaft: Seals degrade over time, causing fluid loss and contamination. Check the 0630532183: INDENTED RING for proper seating.
• Gear slipping under load: The transmission loses torque during acceleration or climbing. This often results from a worn 4656306145: PISTON that fails to apply clutch pressure.
• Unusual whining or grinding noises: Internal bearing or gear damage, often linked to a faulty 0501211384: VALVE causing erratic oil flow.

Technical Specifications

Compatibility

This assembly is engineered for the ZF WG 211 series, but it also fits earlier WG 180 and WG 200 variants with minor adapter modifications. It is commonly used in ZF 6WG-211, 6WG-180, and 6WG-200 transmissions found in Volvo, Case, and New Holland loaders. Always verify the bell housing pattern and output flange configuration before installation. For hydraulic circuit tuning, pair this unit with a 4657120005: PRESSURE REGULATOR to maintain stable line pressure.

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