ZF 4644.306.600 TAPPET for WG200/WG201/WG250 | OEM Genuine Part

Overview

The ZF 4644.306.600 TAPPET is a precision-machined component designed for the hydraulic valve actuation system within ZF WG200, WG201, and WG250 series transmissions. This OEM genuine part, identified by SKU 4644.306.600, functions as a direct-acting plunger that transfers mechanical motion from the shift cam to the valve spool, ensuring precise clutch pack engagement and disengagement. It sits within the valve body assembly, interfacing directly with the TRANSMISSION HOUSING and the TRANSMISSION HOUSING to maintain proper hydraulic circuit integrity. As a wear-critical element, its condition directly influences shift quality and overall transmission longevity.

Symptoms of Failure

• Erratic or delayed gear engagement: When the tappet surface wears, hydraulic pressure drops, causing hesitation when shifting from neutral to drive or reverse.
• Audible clicking or tapping from the valve body: A worn 4644.306.600 tappet creates excessive clearance, producing a metallic noise during gear changes under load.
• Intermittent gear slipping in higher ranges: Reduced tappet stroke prevents full clutch pack clamping, leading to power loss in WG200 and WG250 transmissions.
• Hydraulic fluid contamination: Flaking material from a degraded tappet can circulate through the system, damaging the GROOVED STUD and other valve body components.

Technical Specifications

Compatibility

This tappet is engineered for ZF WG series powershift transmissions, specifically the WG180, WG200, WG201, and WG250 models. It is a direct replacement in valve bodies originally fitted with the 4644.306.600 component. The part is also compatible with certain ZF WG150 variants that share the same valve body architecture. Always verify the 0730365067 TYPE PLATE on your transmission to confirm model identification before installation.

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