ZF 6073.015.475 EST 37 A for WG160 | OEM Genuine Part

Overview

The ZF 6073.015.475 EST 37 A for WG160 is a critical OEM genuine control component engineered specifically for the WG 160 Series transmission family. This precision-machined part governs hydraulic pressure modulation and clutch engagement sequencing within the transmission’s valve body assembly. As an integral element of the shift control system, the 6073.015.475 ensures smooth gear transitions under heavy load conditions. When installed alongside the TRANSMISSION HOUSING, it maintains consistent fluid flow paths that are essential for torque delivery and thermal stability. The SKU 6073.015.475 is factory-tested to ZF’s stringent tolerances, making it a direct replacement for worn units in WG160 applications.

Symptoms of Failure

• Delayed or harsh shifting under load: A failing EST 37 A can cause noticeable hesitation or jarring engagement when the transmission upshifts or downshifts, particularly during hill climbs or towing operations.
• Intermittent loss of drive in forward gears: Worn internal seals or degraded spool valves may lead to momentary power loss, often accompanied by a whining noise from the valve body area.
• Hydraulic fluid contamination or overheating: Debris from a deteriorating 6073.015.475 can circulate through the system, accelerating wear on the HOUS.FRONT SECT and causing fluid to darken or emit a burnt odor.
• Erratic neutral-to-drive engagement: Operators may experience unpredictable clutch pack fill times, leading to creeping or delayed response when selecting a gear from neutral.

Technical Specifications

Compatibility

This genuine ZF part is primarily designed for the WG 160 Series transmission, but it also fits select variants of the WG180, WG200, and WG250 models that share the same valve body architecture. It is commonly used in municipal trucks, refuse vehicles, and medium-duty construction equipment. For proper installation, ensure the mating surfaces on the HOUSING REAR PART and HOUSING REAR SECTION are clean and free of burrs. Always replace associated seals and gaskets when servicing this component to prevent cross-threading or fluid bypass.

Related Components

Frequently Asked Questions

Q: How do I know if the 6073.015.475 EST 37 A is the correct replacement for my WG160 transmission?
Check the stamped number on your existing valve body component. If it matches 6073.015.475 and your transmission is a WG160 series (including WG160-6 or WG160-8 variants), this part is a direct fit. Always verify the production date code if possible.

Q: Can I install this part without replacing the housing seals?
No. ZF recommends replacing all O-rings and gaskets on the HOUS.FRONT SECT and HOUSING REAR PART whenever the EST 37 A is serviced. Reusing old seals risks fluid leaks and pressure loss.

Q: What torque specification should I use for the cap screws securing this part?
Use 25 Nm for the CAP SCREW (0636100817) and 18 Nm for the smaller CAP SCREW (0636100803). Always tighten in a crisscross pattern to avoid warping the valve body.