ZF 4642.306.008 PISTON for WG 150 | OEM Genuine Part

Overview

The ZF 4642.306.008 PISTON is a critical hydraulic actuation component engineered specifically for the WG 150 series transmission. This OEM genuine part converts hydraulic pressure into linear mechanical force to engage clutch packs and shift gears within the planetary gearset. Positioned inside the valve body and clutch drum assembly, the piston ensures precise oil flow control for smooth power delivery. The SKU 4642.306.008 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit and long service life. When paired with a properly sealed TRANSMISSION HOUSING, this piston maintains the hydraulic integrity required for heavy-duty industrial applications.

Symptoms of Failure

• Delayed or harsh gear engagement: A worn piston seal causes internal pressure loss, leading to sluggish shifts or sudden clunking when the transmission engages forward or reverse.
• Intermittent gear slipping under load: As the piston fails to hold hydraulic pressure, the transmission may slip out of gear during acceleration or while climbing inclines.
• Hydraulic fluid contamination: Degraded piston material can shed particles into the oil, causing valve body blockages and accelerated wear on the HOUSING surfaces.
• Oil leaks around the clutch drum: Cracks or scoring on the piston face allow ATF to bypass the seal, resulting in visible drips from the transmission case.

Technical Specifications

Compatibility

This piston is primarily designed for the ZF WG 150 series, but it also fits select models in the WG 180 and WG 200 families due to shared clutch drum dimensions. It is a direct replacement for transmissions used in industrial forklifts, terminal tractors, and construction loaders. Always verify fitment by cross-referencing the TYPE PLATE on your transmission housing. For proper installation, ensure the THREADED BUSH is torqued to specification to prevent seal distortion.

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