ZF 4644.308.629 SPUR GEAR for WG180/WG200 | OEM Genuine Part

Overview

The ZF 4644.308.629 SPUR GEAR is a precision-machined component designed for the auxiliary drive train within the WG180 and WG200 series transmissions. This gear transfers rotational force from the input shaft to the oil pump and PTO (Power Take-Off) system, ensuring consistent hydraulic pressure and auxiliary power delivery. As an OEM genuine part, SKU 4644.308.629 is manufactured to ZF’s exact tolerances for helical tooth engagement and surface hardness. It sits directly behind the 4644105413: DISCONNECTION assembly and interfaces with the 4642303093: OUTPUT FLANGE to synchronize rotational output. This spur gear is critical for maintaining proper gear mesh alignment within the 4644101222: TRANSMISSION HOUSING, where it is secured by a 0636021010: HEXAGON SCREW to prevent axial displacement during high-torque operation.

Symptoms of Failure

• Intermittent hydraulic pressure loss: Worn gear teeth cause irregular oil pump engagement, leading to erratic clutch pack application and delayed shifting in WG180/WG200 units.
• High-pitched whining noise from the transmission housing: Pitting or chipping on the spur gear’s tooth flanks generates a metallic screech during acceleration, often misdiagnosed as bearing failure.
• Metal debris in transmission fluid: Fractured gear fragments contaminate the oil circuit, clogging the 0634306525: O-RING seals and reducing lubrication efficiency.
• PTO disengagement under load: Excessive backlash from a worn 4644.308.629 gear causes the power take-off system to slip or fail to hold torque during heavy equipment operation.

Technical Specifications

Compatibility

This spur gear is engineered exclusively for ZF’s WG180 and WG200 series powershift transmissions. It is a direct replacement for units with serial numbers starting from 2015 onward. The gear is compatible with both the WG180 (6-speed) and WG200 (8-speed) variants, including models with integrated torque converters. It pairs directly with the 4644301226: TRANSMISSION HOUSING and requires the 0631311009: GROOVED STUD for proper alignment during installation. Do not use this gear in WG120 or WG150 series transmissions without verifying shaft spline count.

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