Overview
The ZF 6073.015.358 EST 37 A for WG210 is a critical electro-hydraulic control unit that manages shift timing and pressure regulation within the WG series transmission. This OEM genuine part, identified by SKU 6073.015.358, interfaces directly with the valve body to direct oil flow for clutch and brake engagement. It sits in the upper valve section of the transmission housing, converting electrical signals from the ECU into precise hydraulic actions. When this component fails, the entire shift quality degrades, making it essential for maintaining driveline performance in heavy-duty applications.
Symptoms of Failure
- Erratic or delayed gear engagement – When the EST 37 A wears, you may experience a noticeable lag between selecting a gear and the transmission actually engaging, especially during cold starts.
- Intermittent loss of reverse gear – A failing unit often causes the reverse circuit to drop out under load, leaving the vehicle unable to back up on inclines.
- Transmission fluid contamination – Internal seal degradation allows metallic debris to enter the hydraulic circuit, visible as dark or gritty fluid on the dipstick.
- Harsh upshifts and downshifts – Without proper pressure modulation, shifts become jarring, particularly between 2nd and 3rd gear in the WG210.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 6073.015.358 |
| Designation | EST 37 A |
| Material | Die-cast aluminum with steel solenoid cores |
| Weight | 1.8 kg (4.0 lbs) |
| OEM Reference | ZF 6073.015.358 |
| Operating Voltage | 24V DC |
| Seal Type | Nitrile rubber O-rings (included) |
Compatibility
This EST 37 A unit is primarily designed for the ZF WG210 series, but it also fits select variants of the WG180, WG200, and WG211 transmissions used in municipal trucks, fire apparatus, and off-highway equipment. Always verify your transmission model tag before installation. The part interfaces directly with the TRANSMISSION HOUSING and requires proper alignment with the HOUS.FRONT SECT for correct solenoid positioning. In rear-mounted configurations, it also connects to the HOUSING REAR PART and the HOUSING REAR SECTION for complete hydraulic circuit sealing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Main structural casing for gear and valve assembly |
| 4657201166 | HOUS.FRONT SECT | Front section housing the input shaft and pump |
| 4657201168 | HOUSING REAR PART | Rear housing section for output shaft support |
| 4657298101 | HOUSING REAR SECTION | Extended rear section for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing mating surfaces |
| 0636100801 | CAP SCREW | M10 bolt for securing valve body cover |
| 4656301148 | FIXING PLATE | Retaining plate for solenoid harness |
| 4657301032 | SCREEN SHEET | Fine mesh filter for valve body inlet |
| 4657301033 | SCREEN SHEET | Coarse mesh filter for sump return line |
| 0636100803 | CAP SCREW | M8 bolt for housing flange connection |
Frequently Asked Questions
Q: Can the ZF 6073.015.358 be repaired, or must it be replaced?
A: While the solenoid coils can be tested individually, internal seal wear and corrosion typically require full replacement of the EST 37 A unit to ensure reliable shift performance.
Q: Does this part come with the necessary O-rings and gaskets?
A: Yes, the OEM genuine 6073.015.358 includes new nitrile O-rings for the hydraulic ports. We recommend also replacing the SCREEN SHEET (4657301032) during installation to prevent debris contamination.
Q: What tools are required for installation?
A: You will need a 10mm socket for the CAP SCREW (0636100801) and a torque wrench set to 25 Nm for the housing bolts. A soft mallet helps seat the CYLINDRICAL PIN (0631306816) without damage.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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