ZF 4646.304.038 RING GEAR for WG250 | OEM Genuine Part

Overview

The ZF 4646.304.038 RING GEAR is a critical internal component engineered for the WG250 series transmission. This OEM genuine part functions as the primary torque-transfer interface within the planetary gear set, meshing directly with the pinion gears to convert hydraulic motor power into rotational force. Positioned within the rear section of the transmission housing, the ring gear ensures smooth engagement and load distribution under high-stress conditions. The SKU 4646.304.038 is precision-machined to ZF’s exacting tolerances, making it an essential replacement for maintaining drivetrain integrity in heavy-duty industrial applications.

Symptoms of Failure

• Erratic gear engagement and slipping: A worn ring gear loses tooth profile integrity, causing intermittent power loss or delayed engagement when shifting under load.
• Metallic grinding noise from the transmission: Damaged ring gear teeth produce a distinct whining or grinding sound, especially during acceleration or deceleration in the WG250.
• Contaminated transmission fluid with metal particles: As the ring gear degrades, microscopic steel shavings accumulate in the oil, visible during routine fluid changes or as sludge in the filter.
• Reduced torque capacity and overheating: Excessive backlash from a worn ring gear forces the transmission to work harder, leading to elevated operating temperatures and premature clutch wear.

Technical Specifications

Compatibility

This ring gear is specifically designed for the ZF WG250 series transmission, commonly used in forklifts, reach stackers, and mobile cranes. Based on the part’s tooth geometry and spline configuration, it is also compatible with the WG180, WG200, and WG240 models where the planetary carrier assembly shares identical mounting dimensions. Always verify the transmission serial number before installation. The ring gear integrates directly with the 4646101062 TRANSMISSION HOUSING and the 4646301104 HOUSING to form the main gear train enclosure. For complete assembly, it works in conjunction with the 4646301300 COVER and the 4646323018 CONNECTING PART to ensure axial retention and oil sealing.

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