Overview
The ZF 6073.015.212 EST 37 A is a precision-engineered solenoid valve assembly designed specifically for the WG 210 series transmissions. This OEM genuine part, identified by SKU 6073.015.212, plays a critical role in modulating hydraulic pressure to control clutch engagement and shift timing within the transmission’s valve body. By regulating oil flow to the clutch packs, it ensures smooth gear transitions and consistent power delivery under heavy-duty industrial loads. This component is typically mounted directly on the control unit housing and interfaces with the main transmission casing, such as the TRANSMISSION HOUSING, to maintain precise hydraulic circuit integrity.
Symptoms of Failure
When the ZF 6073.015.212 EST 37 A begins to fail, operators often notice delayed or harsh gear engagement during acceleration, particularly when shifting from neutral to drive. Another common symptom is intermittent transmission slipping under load, where the engine revs increase without a corresponding increase in vehicle speed. You may also detect erratic shift patterns or unexpected downshifts on inclines, caused by inconsistent solenoid response. Finally, internal hydraulic pressure loss can lead to oil leaks around the valve body area, often visible as drips near the HOUS.FRONT SECT interface.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 6073.015.212 |
| Designation | EST 37 A Solenoid Valve |
| Material | Hardened steel spool with aluminum body |
| Operating Pressure | 8–22 bar (116–319 psi) |
| Weight | 0.45 kg (1.0 lb) |
| OEM Reference | ZF 6073.015.212 |
| Seal Type | Nitrile rubber O-rings (included) |
| Voltage | 12V DC / 24V DC compatible |
Compatibility
This solenoid is engineered for the ZF WG 210 series but also fits select models in the WG180, WG200, and WG250 families when used with the correct valve body. It is a direct replacement for the HOUSING REAR PART assembly in WG210 applications. For installations requiring a full housing overhaul, the HOUSING REAR SECTION is often replaced simultaneously to ensure proper solenoid alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Main casing that encloses gear sets and valve body |
| 4657201166 | HOUS.FRONT SECT | Front section of the transmission housing |
| 4657201168 | HOUSING REAR PART | Rear housing segment supporting output shaft |
| 4657298101 | HOUSING REAR SECTION | Alternate rear housing component for WG210 |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 0636100801 | CAP SCREW | Fastener for securing valve body |
| 4656301148 | FIXING PLATE | Mounting plate for solenoid retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4657301033 | SCREEN SHEET | Secondary filter screen for oil return line |
| 0636100803 | CAP SCREW | Bolt for rear housing attachment |
Frequently Asked Questions
Q: Can the ZF 6073.015.212 be tested before installation?
A: Yes. Use a multimeter to check coil resistance (typically 4–6 ohms at 20°C) and apply 12V DC briefly to verify spool movement. Ensure no debris is present in the valve bore.
Q: Is this solenoid interchangeable with the EST 37 B variant?
A: No. The EST 37 A (6073.015.212) has a different flow curve and electrical connector than the B variant. Always verify the part number stamped on the solenoid body before installation.
Q: What torque should be used for the mounting cap screws?
A: Use 8–10 Nm (6–7 ft-lb) for the CAP SCREW fasteners. Over-tightening can distort the valve body and cause sticking.
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