ZF 6073.015.335 EST 37 A for WG210 | OEM Genuine Part

Overview

The ZF 6073.015.335 EST 37 A is a critical electro-hydraulic control unit specifically engineered for the WG 210 Series transmission. This genuine OEM part, identified by SKU 6073.015.335, manages the precise modulation of clutch pressure and gear shift timing within the valve body assembly. It sits directly on the main control block, translating electronic signals from the transmission control unit (TCU) into hydraulic actions that engage and disengage planetary gear sets. Without this component, the transmission cannot execute smooth shifts or maintain proper line pressure, making it essential for the operational integrity of heavy-duty ZF drivetrains.

Symptoms of Failure

When the ZF 6073.015.335 EST 37 A begins to fail, operators typically notice distinct performance degradation. The most common symptoms include:

• Erratic or delayed gear engagement – The transmission hesitates before engaging Drive or Reverse, often accompanied by a harsh clunk.
• Intermittent loss of forward or reverse gears – The unit may suddenly drop out of gear under load, then re-engage without warning.
• Transmission fluid contamination – Internal wear of the solenoid spools can introduce metallic debris into the hydraulic circuit, visible as glitter in the oil pan.
• Persistent diagnostic trouble codes (DTCs) – The TCU logs codes related to solenoid circuit malfunctions or pressure regulation faults, often triggering a limp-home mode.

Technical Specifications

Compatibility

This genuine ZF 6073.015.335 EST 37 A is primarily designed for the WG 210 Series transmission. It is also compatible with select variants of the WG 180, WG 200, and WG 250 series, provided the valve body configuration matches the EST 37 A specification. Always verify the transmission serial number against ZF application charts before installation. The unit is not interchangeable with EST 36 or EST 38 variants due to differences in solenoid stroke and hydraulic porting.

Related Components

During replacement of the EST 37 A, it is strongly recommended to inspect and replace adjacent housing components that seal the hydraulic circuit. The TRANSMISSION HOUSING (4657101082) provides the structural envelope, while the HOUS.FRONT SECT (4657201166) and HOUSING REAR PART (4657201170) form the forward and aft chambers. For complete rear sealing, the HOUSING REAR SECTION (4657298102) is also commonly replaced in tandem. The table below lists all supporting hardware typically ordered with this part.