ZF 4642.302.182 INPUT GEAR for WG150 | OEM Genuine Part

Overview

The ZF 4642.302.182 INPUT GEAR is a precision-machined component engineered specifically for the WG 150 series transmission. This genuine OEM part serves as the primary torque input interface, transferring rotational force from the engine directly into the transmission’s planetary gearset. Positioned at the front of the main shaft assembly, the 4642.302.182 input gear engages with the clutch pack and the TRANSMISSION HOUSING to ensure smooth power delivery under heavy loads. As a critical wear item, this SKU is manufactured from case-hardened alloy steel to withstand high cyclic stress and thermal expansion in commercial vehicle applications.

Symptoms of Failure

• Audible gear whine or grinding during acceleration — Worn teeth on the 4642.302.182 produce a distinct high-pitched noise that intensifies under load, often mistaken for bearing failure.
• Delayed engagement or gear slipping — When the input gear’s splines degrade, torque transfer becomes intermittent, causing the transmission to hesitate before moving or to slip out of gear during uphill climbs.
• Metallic debris in transmission fluid — Flaking or pitting on the gear surface sheds fine steel particles into the oil, which can clog the SCREEN SHEET and accelerate wear on downstream components.
• Vibration through the shift lever — Eccentric wear on the input gear creates radial runout, transmitting noticeable tremors to the cab floor during low-speed maneuvers.

Technical Specifications

Compatibility

This genuine ZF input gear is primarily designed for the WG 150 series, but it also cross-fits select variants of the WG 180 and WG 200 transmissions that share the same input shaft geometry. It is not compatible with older WG 120 or WG 130 models without modification to the TRANSMISSION HOUSING. Always verify the spline count and pilot bearing diameter against your existing assembly. For proper identification, reference the TYPE PLATE affixed to your transmission housing, which lists the exact series and build number. The gear is secured in place using a GROOVED STUD that must be torqued to factory specifications during installation.

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