ZF 5838.300.164 PINION SHAFT for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 5838.300.164 PINION SHAFT is a critical input component within the WG100, WG130, and WG131 transmission series. This OEM genuine part transfers rotational force from the driveline directly into the differential assembly, where it meshes with the ring gear to initiate torque multiplication. As the primary load-bearing shaft in the final drive, it must withstand high torsional stress and constant gear engagement. The SKU 5838.300.164 is precision-machined to ZF factory tolerances, ensuring exact fitment and long service life in heavy-duty industrial applications.

Symptoms of Failure

• Whining or howling noise during acceleration: When the pinion shaft bearings wear, the gear mesh pattern shifts, producing a distinct high-pitched whine that intensifies under load. This is often the first audible sign of pinion shaft degradation.
• Vibration in the transmission housing: A worn pinion shaft can cause noticeable driveline vibration, especially at highway speeds. This vibration often radiates through the chassis and is felt in the operator seat.
• Oil leaks from the pinion seal area: As the shaft surface wears or develops grooves, the pinion seal fails, allowing transmission fluid to escape. Look for drips near the front of the differential housing.
• Gear backlash exceeding specification: Excessive play between the pinion shaft and ring gear indicates worn teeth or bearing failure, leading to clunking during direction changes.

Technical Specifications

Compatibility

This pinion shaft is designed for ZF WG-series transmissions, specifically the WG100, WG130, and WG131 models. These transmissions are commonly found in medium-duty trucks, buses, and construction equipment. The part may also be compatible with select WG180 and WG200 variants that share the same final drive architecture, though cross-referencing with your transmission serial number is recommended. When replacing this shaft, always inspect the 5838109002: DIFFERENTIAL for wear, as the pinion and differential gears wear as a matched set. Additionally, the 0750117075: TAPER ROLLER BEARING supports the pinion shaft and must be replaced simultaneously to prevent premature failure. The 5838300128: DIFFERENTIAL HOUSING provides the mounting bore for these components, and a 0631329086: SPRING PIN secures the shaft assembly during operation.

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