ZF 4657.354.049 PUMP SHAFT for WG191/WG211 | OEM Genuine Part

Overview

The ZF 4657.354.049 PUMP SHAFT is a critical rotating component engineered for the WG191 and WG211 series transmissions. This OEM genuine part serves as the primary drive interface between the torque converter turbine and the hydraulic pump assembly, ensuring consistent oil flow for clutch actuation and lubrication. Positioned within the main gear train, the shaft transmits rotational force directly to the pump rotor. The SKU 4657.354.049 is precision-machined to ZF factory tolerances, guaranteeing a seamless fit with the 4657101049: TRANSMISSION HOUSING and the 4657301130: HOUS.FRONT SECT. Without this shaft, the transmission cannot maintain hydraulic pressure, leading to immediate operational failure.

Symptoms of Failure

• Erratic or delayed gear engagement: A worn pump shaft causes insufficient hydraulic pressure, resulting in harsh shifts or a lag when moving from Neutral to Drive or Reverse.
• Low transmission fluid pressure warnings: If the shaft splines strip or the bearing surface wears, the pump cannot generate adequate flow, triggering dashboard alerts or diagnostic trouble codes.
• Audible whining or grinding noise from the bell housing: Metal-on-metal contact from a fatigued shaft produces a distinct high-pitched whine that intensifies with engine RPM.
• Torque converter shudder or stall: A failing shaft disrupts the converter lock-up cycle, causing vibration during acceleration or complete loss of power transfer.

Technical Specifications

Compatibility

This pump shaft is specifically designed for ZF WG180, WG200, WG191, and WG211 series transmissions used in medium-duty trucks, buses, and off-highway equipment. It directly replaces the original shaft in the pump drive assembly. The shaft interfaces with the 4657301131: HOUSING REAR PART and is secured using a 0631306816: CYLINDRICAL PIN for precise alignment. Always verify the transmission serial number against ZF application charts before installation.

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