Overview
The ZF 6073.015.034 EST 37 A for WG210 is a precision-engineered solenoid valve assembly responsible for modulating hydraulic pressure within the transmission control unit. This OEM genuine part, identified by SKU 6073.015.034, sits directly on the valve body of the WG 210 series, translating electronic shift commands into precise hydraulic actions. It governs clutch engagement and gear selection timing, making it critical for smooth power delivery. When paired with the TRANSMISSION HOUSING, this component ensures that oil flow is directed accurately to the correct circuits, preventing cross-leaks and maintaining consistent line pressure across all operating temperatures.
Symptoms of Failure
- Erratic or harsh shifting under load: A failing EST 37 A solenoid causes delayed or abrupt gear changes, particularly when towing or climbing grades, as hydraulic pressure becomes unstable.
- Intermittent loss of forward or reverse gears: Worn internal seals within the solenoid lead to pressure bleed-off, resulting in temporary gear disengagement or “neutral drops” during operation.
- Transmission fluid contamination from internal wear: Degraded solenoid plunger material can shed metallic particles into the oil, visible as dark or gritty fluid on the dipstick, often accompanied by a burnt odor.
- Persistent diagnostic trouble codes (DTCs) for shift solenoid circuits: The vehicle’s ECU registers codes like P0753 or P0748 when the solenoid’s electrical resistance deviates from factory specifications, causing the transmission to enter limp-home mode.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 6073.015.034 (EST 37 A) |
| OEM Reference | ZF WG210 Series |
| Material | Hard-anodized aluminum body with stainless steel plunger |
| Operating Voltage | 12V DC (nominal) |
| Coil Resistance | 5.0–6.5 Ohms at 20°C |
| Weight | 0.45 kg (1.0 lb) |
| Seal Type | Nitrile rubber O-rings (included) |
| Thread Size | M10 x 1.5 mounting ports |
Compatibility
This solenoid is engineered for the ZF WG 210 series, but it also fits earlier WG180 and WG200 variants due to shared valve body architecture. It is directly interchangeable with the EST 37 solenoid found in WG211 and WG212 models. For proper installation, ensure the HOUS.FRONT SECT and HOUSING REAR PART are free of debris, as contamination can damage the new solenoid within hours. The HOUSING REAR SECTION must also be torqued to factory specifications to prevent fluid bypass around the solenoid bore.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Main structural casing that encloses all gear and valve components |
| 4657201166 | HOUS.FRONT SECT | Forward section of the housing supporting input shaft bearings |
| 4657201168 | HOUSING REAR PART | Rear housing segment that aligns the output shaft and tail cone |
| 4657298101 | HOUSING REAR SECTION | Intermediate rear housing section for planetary gear support |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing mating during assembly |
| 0636100801 | CAP SCREW | M10 fastener securing the solenoid to the valve body |
| 4656301148 | FIXING PLATE | Retaining plate that locks the solenoid in position |
| 4657301032 | SCREEN SHEET | Fine mesh filter protecting solenoid inlet from debris |
| 4657301033 | SCREEN SHEET | Secondary filter screen for return oil flow |
| 0636100803 | CAP SCREW | M8 bolt for securing the fixing plate to the housing |
Frequently Asked Questions
Q: Can I replace just the solenoid without replacing the valve body?
A: Yes, the 6073.015.034 is a standalone serviceable component. However, always inspect the SCREEN SHEET for clogging, as debris accumulation is a common cause of premature solenoid failure.
Q: How do I verify this part is compatible with my WG210 transmission?
A: Check the stamped part number on the existing solenoid. If it reads “EST 37 A” and your transmission serial number begins with WG210, WG180, or WG200, this part is a direct fit. Always replace the CAP SCREW with a new one during installation to ensure proper torque retention.
Q: What is the typical lifespan of this solenoid?
A: Under normal operating conditions (non-severe duty), the EST 37 A solenoid lasts 150,000–200,000 miles. Contaminated fluid or frequent high-temperature operation can reduce this to 80,000 miles. Pairing it with a new FIXING PLATE is recommended to prevent vibration loosening.
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