ZF 6073.015.357 EST 37 A for WG171 | OEM Genuine Part

Overview

This OEM genuine ZF 6073.015.357 EST 37 A for WG171 is a critical electro-hydraulic control unit that manages clutch pressure and shift timing within the WG 171 transmission series. Positioned on the valve body assembly, it interprets electronic signals to direct hydraulic flow, ensuring smooth gear engagement under heavy load. The SKU 6073.015.357 is precision-machined to factory tolerances, making it essential for restoring original shift quality. When replacing this unit, always inspect the 4656101028: TRANSMISSION HOUSING for cracks or warping, as housing integrity directly affects valve alignment.

Symptoms of Failure

• Erratic or delayed shifting – The transmission hesitates or slams into gear, especially when cold, indicating the EST 37 A is not modulating pressure correctly.
• Intermittent loss of forward or reverse – A worn solenoid or stuck spool within the 6073.015.357 can cause sudden drive disengagement under load.
• Transmission overheating with no diagnostic codes – Internal leakage past the control unit forces the pump to work harder, raising fluid temperature without triggering a check engine light.
• Harsh 2-3 upshifts – A specific failure mode where the EST 37 A fails to bleed pressure gradually, resulting in a jarring shift that can damage the 4656301066: HOUS.FRONT SECT over time.

Technical Specifications

Compatibility

This EST 37 A control unit is specifically designed for the ZF WG 171 series, but it also fits select WG 180 and WG 200 variants produced between 2008 and 2018 when used with the correct adapter plate. Always verify the valve body casting number before installation. The unit interfaces directly with the 4656201015: SCREEN SHEET which filters debris from the hydraulic circuit, and the 4656301037: TUBE that routes pressurized oil to the clutch packs. For rear-mounted applications, the 4656301042: HOUSING REAR PART must be free of scoring to ensure proper solenoid stroke.

Related Components

Frequently Asked Questions

Q: Can the ZF 6073.015.357 be repaired, or must it be replaced?
A: This is a sealed electro-hydraulic unit with no serviceable internal parts. Attempting to disassemble it often damages the solenoid windings. Replacement with the OEM genuine part is the only reliable solution.

Q: What torque specification should I use for the mounting cap screws?
A: Tighten the 0636100803: CAP SCREW to 22 Nm (16 ft-lbs) in a cross pattern. Over-torquing can distort the valve body and cause sticking.

Q: Will a failed EST 37 A cause transmission fluid to leak externally?
A: Not directly, but if the 0634313514: O-RING is degraded from heat exposure, fluid can weep past the unit and appear as a drip from the bell housing area.