ZF 4616.301.320 QUILL SHAFT for WG65 | OEM Genuine Part

Overview

The ZF 4616.301.320 QUILL SHAFT is a precision-machined internal component designed specifically for the WG 65 Series transmission. This OEM genuine part serves as a critical torque transfer element within the gear train, ensuring smooth power delivery from the input shaft to the planetary gear sets. The SKU 4616.301.320 is engineered to exact ZF tolerances, reducing vibration and maintaining proper gear alignment under heavy load conditions. When installed correctly, this quill shaft works in concert with the TRANSMISSION HOUSING to provide a rigid, stable foundation for the rotating assembly.

Symptoms of Failure

• Intermittent gear slipping under load: A worn 4616.301.320 quill shaft can cause the gears to lose engagement, particularly during uphill climbs or when towing heavy trailers.
• Metallic grinding noise from the transmission bell housing: As the shaft surface wears, it creates abnormal contact with bearings, producing a distinct grinding sound that intensifies with RPM.
• Oil contamination with metallic debris: Flaking or spalling on the quill shaft surface introduces fine metal particles into the transmission fluid, often visible during routine oil changes.
• Excessive axial play at the output flange: A degraded shaft allows measurable end-play, leading to driveline vibration and premature seal failure.

Technical Specifications

Compatibility

This quill shaft is primarily designed for the ZF WG 65 Series transmission. Based on its spline geometry and length, it is also compatible with the following ZF models: WG180, WG200, WG210, and WG250. The part number 4616.301.320 is a direct replacement for original equipment in these units. For proper installation, always use new HEXAGON SCREW fasteners (part 0636011038) and HEXAGON SCREW (0636011118) to secure the shaft end caps. Additionally, the HEXAGON SCREW (0636016015) is required for mounting the quill shaft to the planetary carrier assembly.

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