Overview
The ZF 6073.015.066 EST 37 A is a critical OEM genuine solenoid valve assembly engineered specifically for the WG 210 series transmission. This electro-hydraulic component modulates clutch pressure and shift timing, ensuring precise gear engagement within the transmission’s valve body. As a direct-fit replacement, the SKU 6073.015.066 interfaces with the main control unit to regulate oil flow, directly affecting shift quality and torque converter lockup. When installed alongside the 4657101082: TRANSMISSION HOUSING, this part forms the backbone of the hydraulic circuit, maintaining consistent line pressure across all operating ranges.
Symptoms of Failure
- Delayed or harsh shifting – A worn EST 37 A solenoid causes sluggish engagement between gears, often accompanied by a noticeable jolt during 2-3 or 3-4 upshifts.
- Intermittent transmission slipping – When this solenoid fails to hold pressure, the transmission may momentarily lose drive power under load, especially during highway merging or hill climbing.
- Erratic torque converter lockup – A failing unit triggers random shudder or failure to lock the converter, leading to elevated fluid temperatures and reduced fuel economy.
- Transmission warning light and limp mode – The ECU detects solenoid circuit faults, forcing the gearbox into a safe mode with limited gear access until the 6073.015.066 is replaced.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 6073.015.066 |
| Designation | EST 37 A Solenoid Valve |
| Material | Hardened steel spool with anodized aluminum body |
| Operating Voltage | 12V DC (PWM controlled) |
| Coil Resistance | 5.2 ± 0.3 ohms at 20°C |
| Weight | 0.34 kg (0.75 lbs) |
| Seal Type | Nitrile rubber O-rings (included) |
| Torque Spec | 8 Nm (retaining bolts) |
Compatibility
This OEM genuine solenoid is primarily designed for the WG 210 series, but it also cross-fits select ZF off-highway and industrial transmissions. Verified compatible models include the WG 180, WG 200, and WG 211 series, where the valve body layout matches the EST 37 A footprint. Always confirm the transmission serial number before installation. The solenoid mounts directly to the 4657201166: HOUS.FRONT SECT and works in concert with the 4657201170: HOUSING REAR PART and 4657298102: HOUSING REAR SECTION to maintain hydraulic integrity.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train and valve body |
| 4657201166 | HOUS.FRONT SECT | Front section housing the pump and torque converter |
| 4657201170 | HOUSING REAR PART | Rear casing supporting output shaft and bearings |
| 4657298102 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M10 bolt for securing valve body to housing |
| 4656301148 | FIXING PLATE | Retainer plate for solenoid bank positioning |
| 4657301032 | SCREEN SHEET | Fine mesh filter for solenoid inlet port |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for main oil gallery |
| 0636100803 | CAP SCREW | M8 bolt for solenoid bracket attachment |
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