ZF 4143.335.025 HELICAL GEAR for WG100/WG130/WG131 | OEM Genuine Part

Overview

The ZF 4143.335.025 HELICAL GEAR is a precision-machined component engineered for the auxiliary drive and power take-off (PTO) circuits within ZF WG100, WG130, and WG131 series transmissions. This OEM genuine part transfers rotational force between parallel shafts, reducing noise and vibration through its angled tooth profile. As a critical element of the gear train, the 4143.335.025 ensures smooth torque delivery under heavy loads. When servicing this gear, technicians often inspect the adjacent 4143101009: HOUSING and the 4143301025: HOUSING for wear or misalignment that could affect gear mesh.

Symptoms of Failure

• Whining or howling noise during acceleration: Worn helical teeth create a distinct high-pitched sound, especially in lower gears, indicating surface pitting or chipping on the 4143.335.025.
• Intermittent gear slipping under load: As the helical profile degrades, the gear loses its ability to maintain constant contact, causing momentary power loss when climbing or hauling.
• Metallic debris in transmission fluid: Flakes or silver particles found during oil changes point to advanced wear of the gear’s hardened steel surface.
• Vibration through the shift lever or chassis: Uneven tooth wear produces cyclical vibrations that worsen as the gear rotates, often accompanied by a failing 0634313603: O-RING allowing fluid contamination.

Technical Specifications

Compatibility

This helical gear is a direct OEM replacement for ZF transmissions in the WG100, WG130, and WG131 series. It also fits select variants of the WG180, WG200, and WG210 models where the auxiliary drive uses the same 37-tooth helical pattern. Always verify the gear’s spline count and bore size against your transmission’s output shaft. During installation, ensure the 4475280018: SCREW PLUG is torqued to specification to prevent oil bypass.

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