ZF 4646.353.087 HELICAL GEAR for WG251 | OEM Genuine Part

Overview

The ZF 4646.353.087 HELICAL GEAR is a precision-machined component engineered for the WG 251 series transmission. This gear sits within the planetary gearset assembly, where it transmits torque and manages rotational speed between the input shaft and the output carrier. As an OEM genuine part, SKU 4646.353.087 ensures exact tooth geometry and surface hardness to maintain the transmission’s load capacity and quiet operation. When paired with a properly sealed TRANSMISSION HOUSING, this helical gear reduces vibration and distributes stress evenly across the drivetrain.

Symptoms of Failure

• Whining or howling noise during acceleration: Worn helical gear teeth create a high-pitched metallic sound, especially under load, indicating uneven tooth contact.
• Intermittent gear slipping under heavy torque: A degraded 4646.353.087 gear loses its ability to maintain positive engagement, causing the transmission to momentarily lose power transfer.
• Metal particles in the transmission fluid: Flaking or pitting on the gear surface contaminates the oil, often visible during routine drain intervals.
• Vibration in neutral or drive: Excessive backlash from a worn helical gear produces a shudder felt through the chassis, worsening as the gear continues to degrade.

Technical Specifications

Compatibility

This helical gear is specifically designed for the ZF WG 251 series transmission. It is also compatible with the WG 180, WG 200, and WG 250 models that share the same planetary gearset architecture. The 4646.353.087 gear interfaces directly with the HOUSING and the COVER assembly, which must be inspected for wear during replacement. Secure installation requires the use of CAP SCREW fasteners torqued to factory specifications to prevent axial play.

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