Overview
The ZF 6073.015.025 EST 37 A for WG171 is a critical OEM genuine component engineered for the precise control of hydraulic pressure within the transmission’s valve body assembly. This part, identified by SKU 6073.015.025, functions as a pressure-regulating spool or sleeve, ensuring smooth gear engagement and consistent clutch pack application. It sits within the main control module of the WG 171 series, directly interfacing with the TRANSMISSION HOUSING to direct oil flow. Without this component, the transmission cannot maintain the necessary hydraulic balance for shifting operations.
Symptoms of Failure
When the ZF 6073.015.025 EST 37 A begins to wear, operators often notice delayed or harsh shifting between gears, particularly under load. A second common symptom is erratic clutch engagement, where the transmission may momentarily slip before catching, leading to a loss of torque during acceleration. Third, internal hydraulic leakage can cause the transmission to overheat, as the oil bypasses the intended circuits and fails to cool the clutches effectively. Finally, a worn part may produce a persistent whining noise from the valve body area, indicating cavitation or restricted fluid flow.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number / SKU | 6073.015.025 |
| OEM Reference | ZF EST 37 A for WG171 |
| Material | Hardened Steel with Anti-Corrosion Coating |
| Weight | 0.45 kg (approx.) |
| Dimensions | 85 mm length x 22 mm diameter |
| Sealing Surface | Ground and Lapped for Leak-Free Operation |
| Operating Pressure | Up to 18 bar |
Compatibility
This OEM genuine part is specifically designed for the ZF WG 171 series transmissions. Based on its hydraulic spool design, it is also compatible with the ZF WG 180 and WG 200 series models that share the same valve body architecture. It is frequently replaced alongside the HOUS.FRONT SECT and the SCREEN SHEET during a full valve body overhaul. For installations requiring fluid routing, the TUBE must also be inspected for debris or scoring.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing for gear and valve assembly |
| 4656301066 | HOUS.FRONT SECT | Front section housing for input shaft and pump |
| 4656201015 | SCREEN SHEET | Fine mesh filter protecting valve body from debris |
| 4656301037 | TUBE | Hydraulic fluid conduit between housing sections |
| 0634313514 | O-RING | Seals fluid passages to prevent external leaks |
| 0636100803 | CAP SCREW | Fastener for securing valve body cover plates |
| 4656301042 | HOUSING REAR PART | Rear casing section supporting output shaft bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0636100801 | CAP SCREW | Bolt for clutch pack retention |
| 0636100160 | CAP SCREW | Fastener for oil pan attachment |
Frequently Asked Questions
Q: How do I know if the 6073.015.025 EST 37 A is the cause of my shifting problems?
A: If you experience delayed engagement when shifting from neutral to drive or reverse, and the transmission fluid is clean and at the correct level, this spool is a likely culprit. A pressure test of the valve body circuit will confirm internal leakage.
Q: Can I replace this part without removing the entire transmission?
A: Yes, in most WG 171 applications, the valve body can be accessed after dropping the oil pan and removing the filter. However, you must also replace the O-RING and inspect the SCREEN SHEET for contamination during the procedure.
Q: Is this part interchangeable with any aftermarket alternatives?
A: We strongly recommend using only the OEM genuine ZF 6073.015.025 EST 37 A. Aftermarket spools often have different internal clearances or surface finishes, which can lead to premature wear of the HOUS.FRONT SECT and other precision components.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
