ZF 4143.303.074 OUTPUT GEAR for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 4143.303.074 OUTPUT GEAR is a critical power-delivery component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part sits at the final drive stage of the gear train, transferring rotational force from the planetary assembly to the output flange. Precision-ground teeth ensure minimal backlash and maximum torque capacity under heavy industrial loads. The SKU 4143.303.074 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit without modification. When installed, this gear interfaces directly with the 4143101031 HOUSING and the 4143301055 HOUSING, forming a sealed, lubricated assembly that withstands continuous high-torque operation.

Symptoms of Failure

• Whining or grinding noise during acceleration: Worn gear teeth produce a distinct high-pitched whine that intensifies under load, indicating surface fatigue or pitting.
• Oil leaks near the output shaft seal: A damaged output gear can cause shaft misalignment, leading to seal failure and visible transmission fluid drips.
• Intermittent gear slipping or loss of drive: Excessive tooth wear reduces engagement depth, causing the gear to skip under heavy torque, especially in reverse or first gear.
• Metallic debris in the transmission fluid: Flaking or chipped gear material contaminates the oil, often detected during routine drain intervals.

Technical Specifications

Compatibility

This output gear is designed for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. It also fits select HL 100 Series and HL 270 Series variants that share the same output shaft geometry. For WG180 or WG200 applications, verify the tooth count and spline dimensions against your existing gear. The 4143298040 CASE and 0631329135 SPRING PIN are commonly replaced during the same service interval to ensure proper alignment and retention.

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