ZF 4699.303.231 SUN GEAR SHAFT for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 4699.303.231 Sun Gear Shaft is a critical internal component engineered for the WG100, WG130, and WG131 transmission series. This OEM genuine part functions as the central drive element within the planetary gear set, transferring torque from the input shaft to the planetary gears while maintaining precise rotational alignment. The sun gear shaft integrates directly with the 4699101159 HOUSING and the 4699301254 HOUSING to form the core gear train assembly. Manufactured to ZF’s exacting tolerances, SKU 4699.303.231 ensures minimal backlash and optimal power transmission efficiency in heavy-duty industrial applications.

Symptoms of Failure

• Gear slipping under load: Worn sun gear shaft teeth cause intermittent power loss during acceleration or uphill operation, often accompanied by a grinding noise from the transmission housing.
• Metallic debris in transmission fluid: Flaking or pitting on the shaft surface introduces steel particles into the oil, visible during routine fluid changes or filter inspections.
• Abnormal vibration at specific RPM ranges: A failing shaft creates harmonic vibrations between 1200-1800 RPM, felt through the vehicle chassis or driveline components.
• Oil leaks near the housing interface: Cracks or wear at the shaft’s bearing journals allow fluid to escape past the 4699298049 HOUSING KIT seals, leaving visible drips under the transmission.

Technical Specifications

Compatibility

This sun gear shaft is specifically designed for ZF’s WG-series powershift transmissions. Confirmed compatible models include the WG100, WG130, and WG131. It may also be suitable for the WG180 and WG200 series when used with the appropriate 4699309123 HOUSING COVER adapter. Always verify the spline count and shaft length against your existing assembly before installation. The part is not compatible with WG150 or WG250 variants without additional modification.

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