ZF 6073.015.274 EST 37 A for WG190 | OEM Genuine Part

Overview

The ZF 6073.015.274 EST 37 A is a critical electro-hydraulic control unit designed specifically for the WG 190 series transmission. This OEM genuine part governs the precise modulation of clutch pressure and shift timing, ensuring smooth gear transitions under heavy load conditions. As the brain of the transmission’s hydraulic circuit, the EST 37 A interfaces directly with the valve body to regulate oil flow. The SKU 6073.015.274 is manufactured to ZF’s exacting tolerances, making it a direct replacement for failed units in commercial vehicles and off-highway equipment. When paired with a robust TRANSMISSION HOUSING, this component ensures the entire assembly maintains structural integrity and hydraulic pressure consistency.

Symptoms of Failure

• Erratic shift timing or harsh engagement: A worn EST 37 A unit causes delayed or abrupt gear changes, often described as “ZF transmission slipping under load.” This occurs when internal solenoids fail to maintain calibrated pressure.
• Intermittent loss of forward or reverse gears: When the control module degrades, operators may experience sudden neutral conditions, particularly during low-speed maneuvering. This is a common “WG190 transmission no forward gear” complaint.
• Hydraulic fluid contamination from internal wear: Debris from a failing EST 37 A can circulate through the system, clogging the SCREEN SHEET and accelerating damage to adjacent components like the HOUS.FRONT SECT.
• Diagnostic trouble codes for solenoid circuit faults: Modern vehicle ECUs will log codes related to “EST 37 A electrical malfunction,” often accompanied by a check transmission light on the dashboard.

Technical Specifications

Compatibility

This EST 37 A control unit is engineered for the ZF WG 190 series, but its mounting pattern and hydraulic interface also suit the WG 180 and WG 200 variants when used with the correct adapter plate. It is not compatible with the Ecomat series without significant modification. The unit bolts directly to the HOUSING REAR PART and requires the HOUSING REAR SECTION to be free of cracks for proper sealing. Always verify the solenoid connector type matches your vehicle’s wiring harness before installation.

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Frequently Asked Questions

Q: Can the ZF 6073.015.274 be repaired, or must it be replaced?
A: This unit is sealed and non-serviceable. Internal solenoid wear or circuit board failure requires full replacement. Attempting to open the housing often damages the gasket and leads to oil leaks.

Q: Does this part include the mounting gasket and bolts?
A: No. The EST 37 A is supplied as a bare unit. You must order the CAP SCREW and CYLINDRICAL PIN separately for installation.

Q: How do I confirm this fits my WG190 transmission?
A: Check the stamped code on your existing unit. If it reads “EST 37 A” and your transmission serial number falls within the WG190 range, this SKU 6073.015.274 is a direct match. Always inspect the HOUSING REAR PART for corrosion before installation.