ZF 4699.300.128 PLANETARY GEAR for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 4699.300.128 PLANETARY GEAR is a critical power-transmission component engineered specifically for the WG100, WG130, and WG131 series transmissions. This OEM genuine part functions as the central load-bearing element within the planetary gearset, transferring torque from the sun gear to the planet carrier while managing extreme rotational forces. The SKU 4699.300.128 sits directly inside the transmission housing, meshing with the ring gear and sun gear to achieve the necessary gear reduction ratios. When installed alongside the 4699100023 BASIC PARTS kit and the 4699300138 HOUSING, this planetary gear ensures smooth, reliable operation under heavy-duty industrial loads.

Symptoms of Failure

• Whining or grinding noise during gear engagement: Worn planetary gear teeth produce a distinct metallic whine, especially under load, indicating advanced wear or pitting on the gear flanks.
• Intermittent gear slipping under torque: A failing 4699.300.128 can cause the transmission to momentarily lose power delivery, often felt as a hesitation or slip when accelerating or climbing.
• Metal particles in transmission fluid: As the planetary gear degrades, microscopic steel shavings contaminate the oil, visible during routine fluid changes or as a gritty residue on the dipstick.
• Overheating of the transmission housing: Increased friction from a damaged planetary gear generates excessive heat, often detected by a burning smell or elevated temperature gauge readings.

Technical Specifications

Compatibility

This planetary gear is precision-machined for the ZF WG100, WG130, and WG131 transmission families. It also fits select variants of the WG180 and WG200 series when used with the appropriate 4699300156 GEAR SHAFT and 4699300127 PLANET CARRIER. Always verify your transmission model and serial number before ordering to ensure correct fitment.

Related Components