ZF 6073.015.004 EST 37 A for WG210 | OEM Genuine Part

Overview

The ZF 6073.015.004 EST 37 A is a critical electro-hydraulic control unit specifically designed for the WG 210 Series transmission. This genuine OEM part governs the precise modulation of clutch pressure and shift timing, ensuring seamless gear changes under heavy load. As the electronic brain of the valve body assembly, the SKU 6073.015.004 interprets signals from the transmission control module to regulate hydraulic flow. It is commonly installed directly onto the HOUS.FRONT SECT and works in tandem with the HOUSING REAR PART to create a sealed hydraulic circuit. Without this component, the transmission cannot achieve proper line pressure, leading to immediate operational failure.

Symptoms of Failure

• Erratic or delayed shifting under load: When the EST 37 A fails, the transmission may hesitate or slam into gear, particularly when climbing grades or towing. This is a common search query for “WG210 transmission shift delay.”
• Loss of reverse gear engagement: A failing solenoid pack often results in a complete inability to engage reverse, or a severe “flare” where the engine revs without moving. This symptom is frequently searched as “ZF WG210 no reverse.”
• Transmission fluid contamination from internal wear: Debris from a degrading EST 37 A can circulate through the system, clogging the SCREEN SHEET and damaging the TRANSMISSION HOUSING.
• Intermittent “limp mode” activation: The ECU will detect electrical faults from this unit, forcing the transmission into a single gear to prevent catastrophic damage, a condition often searched as “WG210 transmission limp mode fix.”

Technical Specifications

Compatibility

This genuine ZF 6073.015.004 is engineered for the WG 210 Series, but its design also supports earlier variants in the WG family. It is directly compatible with the WG180, WG200, and WG210 transmissions found in municipal trucks, fire apparatus, and heavy-duty construction equipment. When replacing this unit, it is critical to inspect the HOUSING REAR SECTION for scoring or cracks, as misalignment can cause premature failure of the new solenoid pack.

Related Components

Frequently Asked Questions

Q: Can the 6073.015.004 be repaired, or must it be replaced?
A: This is a sealed electro-hydraulic unit. Internal solenoid windings and valve spools are not serviceable. Replacement with the OEM genuine part is the only reliable solution to restore proper shift quality.

Q: Does this part require programming after installation?
A: No. The EST 37 A is a passive actuator. It does not contain firmware. However, the transmission ECU may need a recalibration or “adaptation reset” using a diagnostic tool to clear learned shift parameters from the failed unit.

Q: What is the typical lifespan of this solenoid pack?
A: Under normal operating conditions with clean fluid and proper filtration (using the SCREEN SHEET 4657301033), the unit typically lasts 300,000 to 500,000 miles. Contaminated fluid drastically reduces this lifespan.