ZF 6057.018.721 EST 37 A for WG190 | OEM Genuine Part

Overview

The ZF 6057.018.721 EST 37 A for WG190 is a critical electro-hydraulic control unit that manages clutch pressure modulation and shift timing within the transmission valve body assembly. This OEM genuine part, identified by SKU 6057.018.721, sits directly atop the main control bore in the WG 190 series, translating electronic signals from the transmission control module into precise hydraulic actions. It works in concert with the 4657101082: TRANSMISSION HOUSING to ensure consistent oil flow distribution across all gear stages.

Symptoms of Failure

• Erratic shift hunting during load changes — When the EST 37 A solenoid begins to fail, the transmission may randomly upshift or downshift under steady throttle, particularly in 4th and 5th gears.
• Delayed engagement from Neutral to Drive — A worn unit causes a 2-3 second lag before forward motion engages, often accompanied by a soft thud.
• Intermittent “Transmission Overheating” warnings — Internal leakage past the solenoid spool raises sump temperature by 15-20°C during highway cruising.
• Harsh 2-3 upshift under light acceleration — The clutch pack receives inconsistent pressure, resulting in a jarring shift that can be felt through the chassis.

Technical Specifications

Compatibility

This EST 37 A solenoid is primarily designed for the ZF WG 190 series, but it also fits the WG 180 and WG 200 variants when used with the correct 4657201166: HOUS.FRONT SECT adapter plate. It is compatible with all WG190 transmissions built after 2012, including those paired with MAN, DAF, and Iveco chassis. For WG210 applications, verify the valve body casting number against the 4657201170: HOUSING REAR PART to confirm bore depth. The unit also interfaces with the 4657298102: HOUSING REAR SECTION in dual-clutch configurations.

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