ZF 4644.301.117 FIXING PLATE for WG181 | OEM Genuine Part

Overview

The ZF 4644.301.117 FIXING PLATE is a critical retention component engineered specifically for the WG 181 series transmission. This OEM genuine part secures the internal assembly alignment within the gearbox, preventing axial movement of shafts and gear clusters during high-torque operations. The SKU 4644.301.117 sits directly against the TRANSMISSION HOUSING, acting as a precision shim and locking interface that maintains structural integrity under heavy loads. Without this plate, the transmission’s internal clearances would drift, leading to premature wear across the drivetrain.

Symptoms of Failure

• Oil seepage at the housing joint: A worn or warped fixing plate allows lubricant to escape past the HOUSING seal, creating visible drips or wet spots on the bell housing.
• Intermittent gear engagement hesitation: When the plate loses its clamping force, shafts shift fractionally, causing delayed or rough shifting during acceleration or deceleration.
• Metallic rattling from the transmission sump: Loose plate movement generates a distinct tapping noise, especially at idle or low RPM, indicating the THREADED BUSH is no longer properly retained.
• Vibration through the shift lever: Excessive play in the fixing plate transmits harmonic vibrations into the cab, often misdiagnosed as driveline imbalance.

Technical Specifications

Compatibility

This fixing plate is a direct fit for the ZF WG 181 series and is also compatible with the WG 180, WG 200, and WG 210 transmission families when used with the correct TYPE PLATE identification. It integrates with the GROOVED STUD and COVER PLATE to form a complete retention assembly. Always verify the HEXAGON SCREW torque specifications and replace the SEALING RING during installation to prevent leaks. The SET SCREW and HEXAGON SCREW (M8) are required for full assembly.

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