ZF 6073.015.534 EST 37 A for WG190 | OEM Genuine Part

Overview

The ZF 6073.015.534 EST 37 A is a critical electro-hydraulic control unit specifically designed for the WG 190 Series transmission. This OEM genuine part, identified by SKU 6073.015.534, governs shift timing and pressure modulation within the valve body assembly. It acts as the central interface between the transmission control module and the hydraulic circuits, ensuring precise clutch engagement and smooth gear transitions. When paired with a robust TRANSMISSION HOUSING, this unit maintains consistent fluid flow under high torque loads, directly impacting driveline efficiency and component longevity.

Symptoms of Failure

• Erratic shift timing or delayed engagement: A failing EST 37 A often causes hesitation when shifting between forward and reverse gears, particularly under load.
• Intermittent loss of gear hold: Worn internal solenoids or valve spools lead to unintended neutral conditions during operation, a common complaint in WG190 applications.
• Hydraulic pressure fluctuations: You may notice surging or harsh shifts as the unit fails to regulate line pressure, often accompanied by diagnostic trouble codes for solenoid performance.
• External fluid seepage at the valve body interface: Degraded seals around the control unit allow transmission fluid to escape, leaving residue on the HOUS.FRONT SECT and adjacent components.

Technical Specifications

Compatibility

This EST 37 A unit is engineered for the ZF WG 190 transmission family, which includes the WG180, WG190, and WG200 models. It is also backward-compatible with certain WG150 and WG160 variants that share the same valve body architecture. The part integrates directly with the HOUSING REAR PART and the HOUSING REAR SECTION, making it a direct replacement for units with matching casting codes. Always verify the revision letter (A) against your transmission’s serial number to ensure proper fitment.

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