ZF 6073.015.128 EST 37 A for WG210 | OEM Genuine Part

Overview

The ZF 6073.015.128 EST 37 A for WG210 is a precision-engineered solenoid valve assembly that modulates hydraulic pressure within the transmission control unit. This OEM genuine part, identified by SKU 6073.015.128, governs clutch engagement and shift timing in the WG 210 series. Positioned within the valve body, it converts electrical signals from the transmission control module (TCM) into precise hydraulic actions, ensuring smooth gear transitions. When paired with a robust TRANSMISSION HOUSING, this component maintains the integrity of the entire hydraulic circuit.

Symptoms of Failure

• Erratic or delayed shifting: A worn EST 37 A often causes hesitation when shifting from neutral to drive, or between forward gears, particularly under load.
• Transmission slipping in higher gears: As the valve loses sealing capability, you may notice the WG210 slipping out of gear at highway speeds, accompanied by a rise in RPM without acceleration.
• Harsh engagement and flare shifts: Failed solenoids produce abrupt, jarring gear changes, often with a momentary engine flare between shifts, indicating loss of pressure modulation.
• Intermittent limp mode activation: The TCM may trigger a fault code and force the transmission into a single gear (limp mode) when the 6073.015.128 fails to respond correctly to electrical commands.

Technical Specifications

Compatibility

This solenoid is engineered for the ZF WG 210 series, but it also cross-fits select models in the WG180, WG200, and WG250 families that share the same valve body architecture. It is a direct replacement for transmissions used in municipal trucks, fire apparatus, and heavy-duty construction equipment. For a complete rebuild, always inspect the HOUS.FRONT SECT and HOUSING REAR PART for wear, as these castings house the solenoid bores. Additionally, the HOUSING REAR SECTION must be free of scoring to ensure proper valve alignment.

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