ZF 4646.252.068 SPUR GEAR for WG251 | OEM Genuine Part

Overview

The ZF 4646.252.068 SPUR GEAR is a critical power transmission component engineered specifically for the WG 251 series transmission. This OEM genuine part, identified by SKU 4646.252.068, operates within the planetary gear set to transfer rotational torque from the input shaft to the intermediate shaft assembly. By precisely meshing with adjacent pinions, this spur gear ensures smooth gear ratio changes and consistent power delivery under heavy-duty industrial loads. It is housed within the main transmission casing and works in direct conjunction with the 4646101072: TRANSMISSION HOUSING to maintain correct gear alignment and axial clearance.

Symptoms of Failure

• Whining or grinding noise during gear engagement: Worn tooth profiles on the 4646.252.068 spur gear produce a distinct high-pitched whine, especially under load, indicating surface fatigue or pitting.
• Intermittent gear slipping under torque: When the spur gear loses its hardened tooth flank, it can cause momentary loss of drive in the WG251, often misdiagnosed as a clutch issue.
• Metallic debris in transmission oil: Flaking or spalling of the gear surface releases fine steel particles into the lubricant, which can be detected during routine oil changes.
• Vibration at specific RPM ranges: Uneven wear on the spur gear creates harmonic vibrations that resonate through the 4646301201: HOUSING, often felt as a shudder in the driveline.

Technical Specifications

Compatibility

This spur gear is primarily designed for the ZF WG 251 series, but it also fits select models in the WG180 and WG200 families due to shared planetary gear architecture. It is directly compatible with transmissions using the 4646301166: COVER and the 0636101051: CAP SCREW for secure mounting. Always verify the gear ratio and shaft spline count before installation; the 4646.252.068 is not interchangeable with helical gear variants used in WG300 series units.

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