ZF 4616.319.021 QUILL SHAFT for WG65 | OEM Genuine Part

Overview

The ZF 4616.319.021 Quill Shaft is a precision-machined internal component designed specifically for the WG 65 Series transmission. This OEM genuine part serves as the primary torque-transfer interface between the input shaft and the planetary gear set, ensuring smooth power delivery under heavy-duty industrial loads. The SKU 4616.319.021 is manufactured to ZF’s exacting tolerances, featuring hardened steel construction to withstand continuous high-torque cycles. It mounts directly within the TRANSMISSION HOUSING, where it aligns with the clutch pack assembly to modulate gear engagement.

Symptoms of Failure

• Erratic gear engagement or delayed shifting – A worn quill shaft can cause hesitation when shifting between forward and reverse, often misdiagnosed as a solenoid issue.
• Metallic grinding noise from the transmission bell housing – This indicates the shaft’s splines have worn, creating play between the quill shaft and mating gears.
• Low hydraulic pressure warnings – When the quill shaft surface becomes scored, it disrupts oil flow through the shaft’s internal passages, triggering pressure loss in the control system.
• Visible metal particles in the transmission fluid – Flaking from the quill shaft’s hardened surface will contaminate the oil, often requiring replacement of the FILTER INSERT simultaneously.

Technical Specifications

Compatibility

This quill shaft is engineered for the ZF WG 65 Series, but its design parameters also allow installation in select WG180 and WG200 models that share the same spline geometry and housing interface. It is a direct replacement for transmissions built between 2005 and 2020. Always verify the shaft’s fitment against your transmission’s serial number. During installation, secure the shaft using the HEXAGON SCREW (M10x30) and the HEXAGON SCREW (M12x35) for the bearing retainer. The HEXAGON SCREW (M8x20) is used to fasten the shaft’s retaining plate to the housing.

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