Overview
The ZF 6073.015.407 EST 37 A for WG171 is a critical electro-hydraulic control unit designed to manage shift timing and pressure modulation within the WG 171 series transmission. This OEM genuine part, identified by SKU 6073.015.407, sits directly on the valve body assembly and acts as the central interface between the transmission control module and the clutch packs. By precisely regulating oil flow, it ensures smooth gear engagement and consistent torque delivery under heavy-duty industrial loads. When paired with a robust TRANSMISSION HOUSING, this component maintains structural integrity during high-pressure operation.
Symptoms of Failure
- Erratic or delayed gear engagement: Worn solenoids or spool valves cause hesitation when shifting from neutral to drive, often accompanied by a harsh clunk.
- Intermittent transmission slipping: As the EST 37 A loses calibration, the transmission may momentarily lose power under load, particularly during uphill climbs or heavy towing.
- Fluid contamination and overheating: Internal seal degradation allows debris to bypass the SCREEN SHEET, leading to restricted flow and elevated sump temperatures.
- Persistent diagnostic trouble codes (DTCs): Fault codes related to shift solenoid performance or pressure control circuit malfunctions often trace back to a failing 6073.015.407 unit.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 6073.015.407 |
| Designation | EST 37 A |
| Material | Die-cast aluminum alloy with hardened steel spool |
| Weight | 1.85 kg (4.08 lbs) |
| OEM Reference | ZF 6073.015.407 |
| Operating Pressure | 12–18 bar |
| Seal Type | PTFE energized lip seal |
Compatibility
This EST 37 A unit is engineered for the ZF WG 171 series but shares mounting patterns and hydraulic logic with several other ZF industrial transmissions. It is directly compatible with the WG 180, WG 200, and WG 210 models when used with the correct HOUS.FRONT SECT. For retrofitting into older WG 150 or WG 160 units, verify that the TUBE alignment matches your valve body configuration. Always consult your transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Encloses gear train and supports bearing loads |
| 4656301066 | HOUS.FRONT SECT | Front section housing for pump and converter |
| 4656201015 | SCREEN SHEET | Fine mesh filter protecting valve body from debris |
| 4656301037 | TUBE | Fluid transfer conduit between pump and cooler |
| 0634313514 | O-RING | Static seal for hydraulic port connections |
| 0636100803 | CAP SCREW | M10 x 30 fastener for valve body retention |
| 4656301042 | HOUSING REAR PART | Rear section housing output shaft and bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0636100801 | CAP SCREW | M8 x 25 fastener for front section assembly |
| 0636100160 | CAP SCREW | M12 x 35 high-torque fastener for housing |
Frequently Asked Questions
Q: Can the 6073.015.407 EST 37 A be rebuilt instead of replaced?
A: While the solenoid coils and seals are serviceable, internal spool valve wear is difficult to measure without specialized flow benches. For commercial vehicles, replacement with an OEM genuine unit is strongly recommended to avoid repeat downtime.
Q: What torque specification should I use for the mounting bolts?
A: Fasten the four M6 bolts to 12 Nm (106 in-lbs) in a cross pattern. Always install new O-rings and a clean SCREEN SHEET during reassembly to prevent immediate contamination.
Q: Will this part work with a ZF WG 180 transmission?
A: Yes, the EST 37 A is mechanically interchangeable with WG 180 and WG 200 models, provided you also replace the TUBE and O-RING to match the updated port geometry.
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