ZF 4651.351.013 SPUR GEAR for WG100 | OEM Genuine Part

Overview

The ZF 4651.351.013 SPUR GEAR is a critical power transmission component engineered specifically for the WG 100 series transmission. This OEM genuine part, identified by SKU 4651.351.013, functions as a precision-machined gear that transfers rotational torque between parallel shafts within the gear train assembly. Located in the intermediate shaft cluster, this spur gear ensures smooth engagement and consistent power flow, directly influencing shift quality and overall driveline efficiency. When installed correctly, it maintains the exact gear ratios required for heavy-duty industrial applications, reducing vibration and mechanical noise during operation.

Symptoms of Failure

• Whining or grinding noise during gear engagement: As the spur gear teeth wear unevenly, operators often report a high-pitched whine or metallic grinding sound, particularly under load. This is a common long-tail search query for “ZF transmission whining noise when accelerating.”
• Intermittent gear slipping under torque: Worn tooth profiles can cause the gear to lose positive engagement, resulting in sudden slipping or hesitation during power transfer. This symptom is frequently searched as “WG100 transmission slipping under load.”
• Metallic debris in transmission fluid: Flaking or pitting on the gear surface introduces fine metal particles into the oil system. Technicians searching for “metal shavings in ZF transmission fluid” will find this part relevant.
• Increased operating temperature: Excessive friction from a damaged spur gear generates abnormal heat, often triggering thermal warnings or causing fluid degradation faster than normal.

Technical Specifications

Compatibility

This spur gear is primarily designed for the ZF WG 100 series transmission family, including models such as WG100, WG120, and WG150. It also fits select variants of the WG180 and WG200 series where the intermediate shaft configuration matches the 39-tooth gear set. Always verify the gear ratio and shaft spline count against your specific transmission serial number before installation. The part is not compatible with older WG80 or WG90 series units without modification.

Related Components

When replacing the spur gear, it is strongly recommended to inspect the TRANSMISSION HOUSING for cracks or wear at the bearing journals. The HOUSING sections must be clean and free of burrs to ensure proper gear alignment. Always install a new O-RING between the HOUSING interfaces to prevent fluid migration that could lead to pressure loss.