ZF 4644.308.620 SPUR GEAR for WG200 | OEM Genuine Part

Overview

The ZF 4644.308.620 SPUR GEAR is a critical power transmission component engineered specifically for the WG 200 Series of off-highway transmissions. This OEM genuine part functions as a direct-drive gear within the planetary gearset, transferring torque from the input shaft to the output assembly with minimal energy loss. Precision-machined from high-strength alloy steel, the 4644.308.620 spur gear ensures smooth engagement and consistent load distribution under extreme operating conditions. When installed alongside the 4644105475: DISCONNECTION mechanism, this gear facilitates reliable power interruption during clutch cycling. The gear’s tooth profile is optimized for the WG200’s helical-cut counterparts, reducing noise and vibration in heavy-duty applications.

Symptoms of Failure

• Whining or grinding noise during gear engagement: A worn 4644.308.620 spur gear produces a distinct high-pitched whine or metallic grinding sound, especially under load. This indicates pitting or tooth surface fatigue.
• Intermittent power loss under acceleration: When the gear teeth become chipped or excessively worn, the transmission may slip or fail to transmit full torque, causing hesitation during acceleration.
• Metal particles in transmission fluid: Advanced wear of the spur gear generates fine metallic debris that contaminates the oil, often visible during routine fluid changes or when inspecting the 4644101134: TRANSMISSION HOUSING.
• Vibration through the driveline: Uneven tooth wear or a cracked gear hub creates measurable vibration that transfers through the 4642303097: OUTPUT FLANGE, worsening with higher RPM.

Technical Specifications

Compatibility

This ZF 4644.308.620 spur gear is primarily designed for the WG 200 Series transmissions, including models WG200, WG180, and WG160. It is also compatible with certain variants of the WG 211 and WG 220 series where the planetary gearset uses a 28-tooth spur gear. Always verify the tooth count and bore spline configuration before installation. The gear interfaces directly with the 0636020211: HEXAGON SCREW fasteners that secure the gear carrier assembly. For complete rebuilds, pairing this spur gear with a new 4644301349: HOUSING ensures proper alignment and extended service life.

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