Overview
The ZF 6073.015.284 EST 37 A for WG211 is a precision-engineered solenoid valve assembly that regulates hydraulic pressure within the transmission control unit. This OEM genuine part, identified by SKU 6073.015.284, sits directly on the valve body of the WG 211 Series transmission, modulating clutch and brake application for smooth gear shifts. It converts electrical signals from the transmission control module (TCM) into precise hydraulic actions, ensuring optimal torque delivery and shift timing. When paired with the TRANSMISSION HOUSING and the HOUS.FRONT SECT, this component forms the core of the electro-hydraulic control network.
Symptoms of Failure
When the ZF 6073.015.284 EST 37 A begins to fail, operators often notice erratic shifting or delayed engagement. Specific failure symptoms include:
- Harsh or delayed gear engagement – The transmission hesitates before moving into drive or reverse, often accompanied by a jarring clunk.
- Intermittent gear slipping – The transmission unexpectedly loses power under load, particularly during uphill climbs or heavy hauling.
- Transmission fluid leaks – Hydraulic fluid seeps from the solenoid bore area, leaving puddles under the vehicle and causing low fluid levels.
- Check engine or transmission warning lights – The TCM detects solenoid circuit faults, storing diagnostic trouble codes (DTCs) like P0748 or P0753.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 6073.015.284 |
| Designation | EST 37 A Solenoid Valve |
| Material | Hardened steel spool with aluminum housing |
| Operating Voltage | 12V / 24V (PWM controlled) |
| Weight | 0.45 kg (1.0 lb) |
| OEM Reference | ZF 6073.015.284 |
| Seal Type | O-ring with PTFE backup ring |
| Max Pressure | 20 bar (290 psi) |
Compatibility
This EST 37 A solenoid is primarily designed for the ZF WG 211 Series, but it also fits earlier WG180, WG200, and WG210 transmission models that share the same valve body architecture. It is a direct replacement for units requiring the HOUSING REAR PART and the CYLINDRICAL PIN for secure mounting. Always verify your transmission serial number before ordering to ensure correct fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Encloses and protects the gear train and valve body |
| 4657301130 | HOUS.FRONT SECT | Front section of the transmission housing, supports input shaft |
| 4657301131 | HOUSING REAR PART | Rear housing section, contains output shaft bearing bore |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing assembly |
| 0636102489 | CAP SCREW | M10 fastener for securing valve body to housing |
| 4656301148 | FIXING PLATE | Retains solenoid valves in their bores |
| 0636102463 | CAP SCREW | M8 bolt for fixing plate attachment |
| 4657201133 | SCREEN SHEET | Fine mesh filter protecting solenoid from debris |
| 0636115287 | CAP SCREW | M6 bolt for screen sheet retention |
| 4657301065 | PLATE | Spacer plate between valve body and housing |
Frequently Asked Questions
Q: Can I replace the ZF 6073.015.284 without removing the transmission?
A: Yes, in most WG211 applications, the solenoid is accessible after removing the transmission oil pan and valve body cover. However, you must drain the fluid and replace the O-rings to prevent leaks.
Q: How do I test if the EST 37 A solenoid is faulty?
A: Use a multimeter to measure resistance across the solenoid terminals. The expected range is 4.5–6.5 ohms at 20°C. An open circuit or short to ground indicates a failed unit. Also check for metal debris on the SCREEN SHEET.
Q: Is this part interchangeable with the EST 37 B variant?
A: No. The EST 37 A (6073.015.284) has a different PWM duty cycle calibration than the EST 37 B. Using the wrong variant can cause shift timing errors and potential damage to the TRANSMISSION HOUSING.
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