ZF 4646.303.053 GEAR for WG251 | OEM Genuine Part

Overview

The ZF 4646.303.053 GEAR is a precision-engineered helical gear designed specifically for the WG 251 series of powershift transmissions. This OEM genuine component sits within the planetary gear set assembly, where it transfers torque from the input shaft to the intermediate shaft, ensuring smooth power delivery under heavy load conditions. As a critical wear item, the 4646.303.053 gear maintains proper gear mesh alignment and reduces drivetrain noise. The SKU 4646.303.053 is manufactured to ZF’s original factory tolerances, guaranteeing a direct replacement without modification. When paired with a robust TRANSMISSION HOUSING, this gear ensures long-term durability in demanding industrial applications such as forklifts, airport ground support equipment, and construction vehicles.

Symptoms of Failure

• Whining or grinding noise during gear engagement — Worn gear teeth cause audible metal-on-metal contact, especially when shifting from neutral to drive under load.
• Intermittent gear slipping under torque — As the 4646.303.053 gear loses tooth profile integrity, the transmission may momentarily lose power transfer when climbing grades or accelerating.
• Metallic debris in transmission fluid — Flaking or pitting on the gear surface introduces fine metal particles into the oil, often visible during routine fluid changes.
• Vibration at specific RPM ranges — Unbalanced gear rotation from uneven wear creates harmonic vibrations felt through the chassis at cruising speeds.

Technical Specifications

Compatibility

This gear is primarily engineered for the ZF WG 251 transmission series. It is also compatible with the following ZF models that share the same planetary gear architecture: WG 180, WG 200, WG 211, and WG 241. The 4646.303.053 gear directly replaces earlier revision parts in these transmissions without requiring additional shimming. For proper installation, ensure the mating HOUSING is free of cracks and the COVER is torqued to specification using a CAP SCREW of correct grade.

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