ZF 2099.346.002 SPUR GEAR for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 2099.346.002 SPUR GEAR is a precision-machined component engineered for the auxiliary drive and power take-off (PTO) circuits within the WG100, WG130, and WG131 transmission families. This OEM genuine part transfers rotational force from the input shaft to the countershaft assembly, ensuring synchronized gear engagement under heavy load. The SKU 2099.346.002 is manufactured to ZF’s original tolerances, featuring case-hardened alloy steel for extended service life in municipal trucks, refuse vehicles, and construction equipment. When installed alongside the 2099109002 DIFFERENTIAL, this spur gear maintains consistent torque distribution to the final drive.

Symptoms of Failure

• Whining or howling noise during deceleration: Worn tooth profiles on the 2099.346.002 cause a distinct high-pitched whine that intensifies when the vehicle coasts, often misdiagnosed as a bearing issue.
• Intermittent gear slippage under load: As the spur gear’s teeth wear unevenly, the transmission may momentarily lose drive engagement when climbing grades or hauling heavy payloads.
• Metallic debris in transmission fluid: Flaking or pitting on the gear face sheds fine steel particles into the oil, visible during routine drain intervals as a glittering sludge.
• Hard shifting into PTO modes: A failing spur gear creates binding in the auxiliary shaft, making engagement of power take-off systems stiff or requiring excessive lever force.

Technical Specifications

Compatibility

This spur gear is a direct-fit replacement for ZF WG-series transmissions with the following model designations: WG100, WG130, and WG131. It is also compatible with select WG180 and WG200 variants that share the same auxiliary shaft spline count and center distance. The gear interfaces with the 2099364014 CROWN WHEEL in the differential housing and works in concert with the 2099209001 DIFFERENTIAL to manage speed differentiation. For complete assembly, verify that the 2098309010 DIFFERENTIAL HOUSING is free of cracks or wear before installation.

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