ZF 4620.306.244 PISTON for WG65 | OEM Genuine Part

Overview

The ZF 4620.306.244 PISTON for WG65 is a critical hydraulic actuation component engineered for precise clutch or brake application within the WG 65 series transmission. This OEM genuine part converts hydraulic pressure into linear mechanical force, directly engaging the clutch packs to facilitate smooth gear shifts and torque transfer. As a wear-sensitive element, the piston sits within the TRANSMISSION HOUSING, where it must maintain a perfect seal to ensure consistent hydraulic response. The SKU 4620.306.244 is manufactured to ZF’s exacting tolerances, making it a direct replacement for failed units in heavy-duty industrial drivelines.

Symptoms of Failure

• Delayed or harsh gear engagement: A worn or scored piston surface allows hydraulic fluid to bypass, causing sluggish shifts or sudden clunking when the transmission engages.
• Internal hydraulic pressure loss: Cracks or corrosion on the piston face lead to a drop in system pressure, often accompanied by erratic clutch behavior under load.
• Transmission fluid contamination: Degraded piston seals allow metal particles or debris to enter the oil circuit, visible as dark, gritty fluid during routine checks.
• Audible knocking or vibration: Excessive piston clearance within the bore creates a repetitive metallic noise during gear changes, especially in low-speed maneuvers.

Technical Specifications

Compatibility

This piston is specifically designed for the ZF WG 65 series transmissions. Based on its hydraulic architecture, it is also compatible with the following ZF models that share the same clutch piston design: WG180, WG200, WG210, and WG250. Always verify the piston diameter and seal groove configuration against your transmission’s service manual before installation. For secure mounting, use the HEXAGON SCREW (0636011038), HEXAGON SCREW (0636011118), and HEXAGON SCREW (0636016015) to fasten the piston assembly to the transmission housing.

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