ZF 4005.303.015 LOCKING PLATE for WG65 | OEM Genuine Part

Overview

The ZF 4005.303.015 LOCKING PLATE is a critical retention component engineered specifically for the WG 65 series of heavy-duty transmissions. This OEM genuine part secures the output shaft assembly within the main gear case, preventing axial movement that could compromise drivetrain integrity. The locking plate interfaces directly with the TRANSMISSION HOUSING to maintain precise gear alignment under high torque loads. As part number 4005.303.015, it is manufactured to ZF’s exacting tolerances, ensuring a positive mechanical lock that resists vibration and thermal cycling in demanding industrial applications.

Symptoms of Failure

• Output shaft end-play or axial movement – When the locking plate fatigues or deforms, the shaft can shift, causing irregular gear engagement and driveline clunking during acceleration or deceleration.
• Transmission oil seepage at the rear housing joint – A worn locking plate allows the shaft to misalign, breaking the seal between the housing and output flange, leading to slow oil leaks that worsen over time.
• Intermittent gear slipping under load – Loss of axial retention allows the planetary gear set to drift out of its designed mesh, producing momentary power loss or harsh shifting in WG65-equipped vehicles.
• Unusual metallic rattling from the transmission bell housing – A loose locking plate can vibrate against the HEXAGON SCREW fasteners, creating a distinct rattle at idle that disappears under load.

Technical Specifications

Compatibility

This locking plate is a direct-fit component for the ZF WG 65 series transmission family. It is also compatible with the following ZF models that share the same output shaft retention architecture: WG180, WG200, WG210, and WG250. The part is designed to work with the HEXAGON SCREW 0636016015 for secure mounting to the housing. Always verify your transmission serial number against the ZF parts catalog to confirm fitment for non-WG65 variants.

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