ZF 4143.342.066 PUMP SHAFT for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 4143.342.066 PUMP SHAFT is a precision-machined component engineered for the hydraulic pump drive within ZF WG100, WG130, and WG131 transmissions. This OEM genuine part transmits rotational torque from the transmission’s input assembly directly to the hydraulic pump, ensuring consistent oil flow for clutch actuation and lubrication. The SKU 4143.342.066 sits at the interface between the pump housing and the gear train, making it critical for maintaining system pressure. When installed alongside the 4143101022 HOUSING and the 4143301044 HOUSING, this shaft provides the precise alignment needed for long-term durability in heavy-duty applications.

Symptoms of Failure

• Erratic hydraulic pressure or delayed engagement — A worn pump shaft can cause the pump to cavitate or lose prime, leading to sluggish gear shifts and inconsistent clutch response.
• Oil leaks at the pump housing interface — Excessive radial play from a scored shaft damages the seal, resulting in visible drips around the 0636302014 SCREW PLUG and housing joint.
• Metallic debris in transmission fluid — Fretting or spline wear on the shaft sheds fine metal particles, which can be detected during routine oil changes.
• Audible whining or knocking from the pump area — A bent or fatigued shaft produces a distinct noise under load, often mistaken for pump failure.

Technical Specifications

Compatibility

This pump shaft is a direct fit for ZF WG100, WG130, and WG131 series transmissions. It also serves as a service replacement for select HL 100 and HL 270 series units where the hydraulic pump drive geometry matches. For WG180, WG200, and WG210 models, verify the pump mounting flange pattern before ordering. The shaft works in concert with the 0631329135 SPRING PIN to secure the drive gear, and the 0634801057 SEALING RING must be replaced simultaneously to prevent fluid bypass.

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