ZF 4699.203.061 RING GEAR for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 4699.203.061 RING GEAR is a critical component within the planetary gear set of the WG100, WG130, and WG131 transmission series. This OEM genuine part transmits high torque from the drive pinion to the output shaft, ensuring smooth power flow during gear shifts. As a hardened steel ring with precision-cut internal teeth, it meshes directly with the planetary gears to manage load distribution. The SKU 4699.203.061 is engineered to ZF’s exacting tolerances, making it essential for maintaining drivetrain integrity in heavy-duty commercial vehicles. When installed alongside the 4699101053 HOUSING and 4699301126 HOUSING, this ring gear forms the core of the rotating assembly.

Symptoms of Failure

• Whining or growling noise during acceleration: Worn ring gear teeth cause irregular contact with planetary gears, producing a distinct metallic sound that intensifies under load.
• Intermittent gear slipping under torque: As the internal teeth wear, the ring gear fails to hold the planetary gears, leading to sudden loss of drive power, especially on inclines.
• Metal particles in transmission fluid: Fractured ring gear teeth shed debris into the oil, often visible during routine fluid changes or when inspecting the 0634801038 SEALING RING for contamination.
• Hard shifting between forward and reverse: Excessive backlash from a worn ring gear disrupts clutch pack engagement, causing delayed or jerky gear changes.

Technical Specifications

Compatibility

This ring gear is specifically designed for ZF WG100, WG130, and WG131 transmissions, commonly found in municipal trucks, fire apparatus, and construction loaders. It also fits select variants of the WG180 and WG200 series when used with the correct 0501319149 SCREW PLUG for oil gallery sealing. Always verify the transmission serial number before installation, as the WG131 uses a modified tooth profile for higher torque ratings.

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