ZF 6073.015.081 EST 37 A for WG190 | OEM Genuine Part

Overview

The ZF 6073.015.081 EST 37 A for WG190 is a precision-engineered solenoid valve assembly that governs hydraulic flow within the transmission control unit. This OEM genuine part, identified by SKU 6073.015.081, modulates clutch engagement and shift timing in the WG 190 Series gearbox. It interfaces directly with the valve body to regulate line pressure, ensuring smooth gear transitions under heavy-duty loads. Without this component, the transmission cannot execute electronic shift commands, making it critical for drivability and torque management.

Symptoms of Failure

• Delayed or harsh shifting: When the EST 37 A solenoid wears, hydraulic pressure fluctuates, causing noticeable lag between gear changes or abrupt engagement during acceleration.
• Transmission slipping in higher gears: A failing unit often leads to loss of pressure in the clutch packs, resulting in RPM flare without corresponding speed increase, particularly in 4th and 5th gear.
• Intermittent “limp mode” activation: The transmission control module detects erratic solenoid resistance and forces the gearbox into a safe mode, limiting speed to second or third gear until the part is replaced.
• Oil contamination in the solenoid bore: Worn seals allow debris-laden fluid to bypass the valve, causing sticking and eventual failure of the TRANSMISSION HOUSING mounting interface.

Technical Specifications

Compatibility

This solenoid is specifically calibrated for the ZF WG190 series, but it also fits select variants in the WG180 and WG200 families due to shared valve body architecture. It is a direct replacement for units requiring the EST 37 A logic module. When servicing the valve body, always inspect the HOUS.FRONT SECT for scoring and verify the HOUSING REAR PART alignment. For complete overhauls, the HOUSING REAR SECTION must be checked for warpage to prevent fluid cross-leakage.

Related Components