ZF 4642.252.050 SPUR GEAR for WG150 | OEM Genuine Part

Overview

The ZF 4642.252.050 SPUR GEAR is a precision-machined component engineered specifically for the WG150 series transmission. This gear sits within the planetary gearset assembly, where it transmits torque from the input shaft to the output shaft through direct meshing with adjacent pinions. As an OEM genuine part, the 4642.252.050 ensures exact tooth geometry and material hardness required for reliable power flow under heavy-duty industrial loads. When installed alongside the 4642101109 TRANSMISSION HOUSING, this spur gear maintains proper shaft alignment and reduces internal friction.

Symptoms of Failure

• Whining or grinding noise during gear engagement — Worn tooth profiles on the 4642.252.050 create audible metallic sounds, especially under load, indicating surface fatigue or pitting.
• Intermittent power loss or gear slipping — As the spur gear loses tooth height, the transmission may momentarily lose torque transfer, causing erratic vehicle movement or load drop.
• Metal particles in transmission oil — Advanced wear generates fine metallic debris visible during oil changes, often accompanied by a burnt smell from increased friction.
• Vibration at specific RPM ranges — Uneven tooth wear or chipping produces harmonic vibrations that intensify as the gear rotates, signaling imminent failure.

Technical Specifications

Compatibility

This spur gear is primarily designed for the WG150 series transmission, but it also fits select variants of the WG180 and WG200 models where the planetary gearset uses identical tooth geometry. Always verify the gear ratio and shaft spline count before installation. The 4642.252.050 works in conjunction with the 4642301205 TRANSMISSION HOUSING to provide correct gear mesh clearance. For identification purposes, the 0730365125 TYPE PLATE on the transmission housing confirms the exact model variant. Secure mounting is achieved using the 0631311009 GROOVED STUD to prevent axial movement during operation.

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