Overview
The ZF 6073.015.151 EST 37 A for WG210 is a precision-engineered solenoid valve assembly that modulates hydraulic pressure within the transmission control unit. This OEM genuine part, identified by SKU 6073.015.151, sits directly on the valve body and governs clutch engagement and shift timing. When functioning correctly, it ensures smooth gear transitions and consistent torque delivery. For optimal sealing and structural integrity, this component is often installed alongside the TRANSMISSION HOUSING and the HOUS.FRONT SECT to prevent fluid contamination.
Symptoms of Failure
- Erratic shift timing or delayed engagement: A failing EST 37 A solenoid causes the transmission to hesitate before shifting, particularly under load.
- Intermittent gear slipping in higher ranges: Worn internal seals lead to pressure loss, resulting in the WG210 slipping out of gear during highway driving.
- Transmission fluid leaks near the valve body: Cracks in the solenoid housing or degraded O-rings allow ATF to seep out, often pooling around the HOUSING REAR PART.
- Persistent diagnostic trouble codes (P0741, P0753): Electrical resistance changes in the solenoid coil trigger warning lights and limp-home mode.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 6073.015.151 |
| OEM Reference | EST 37 A |
| Material | Hard-anodized aluminum body with brass spool |
| Weight | 0.42 kg (0.93 lbs) |
| Operating Voltage | 12V DC (PWM controlled) |
| Seal Type | Viton O-ring |
| Torque Spec | 8 Nm (mounting bolts) |
Compatibility
This solenoid is engineered for the ZF WG210 series but also fits select WG180, WG200, and WG190 variants that share the same valve body architecture. It is a direct replacement for earlier EST 37 revisions. When servicing the rear section of the transmission, verify alignment with the HOUSING REAR SECTION to avoid cross-threading. Always pair replacement with fresh sealing hardware.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Encloses gear train and valve body |
| 4657201166 | HOUS.FRONT SECT | Front section housing for torque converter |
| 4657201168 | HOUSING REAR PART | Rear housing cover for output shaft |
| 4657298101 | HOUSING REAR SECTION | Intermediate rear housing adapter |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M8 bolt for valve body retention |
| 4656301148 | FIXING PLATE | Secures solenoid harness to housing |
| 4657301032 | SCREEN SHEET | Fine mesh filter for valve body inlet |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for oil pump |
| 0636100803 | CAP SCREW | M10 bolt for rear housing flange |
Frequently Asked Questions
Q: Can the 6073.015.151 be tested before installation?
A: Yes. Measure coil resistance between pins 1 and 2; it should read 4.5–5.5 ohms at 20°C. Also apply 12V briefly to confirm the spool clicks audibly.
Q: Is this solenoid interchangeable with the EST 37 B variant?
A: No. The EST 37 A uses a different PWM frequency curve. Installing a B variant will cause harsh shifts and possible transmission damage.
Q: What torque should be applied to the mounting bolts?
A: Tighten to 8 Nm using a calibrated torque wrench. Over-torquing can crack the aluminum housing and cause fluid leaks.
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