Overview
The ZF 6073.015.580 EST 37 A is a genuine OEM control unit specifically engineered for the WG 230 series transmission. This electro-hydraulic module governs shift timing and pressure regulation, acting as the central interface between the transmission control unit and the valve body. The SKU 6073.015.580 ensures precise actuation of clutches and brakes within the gearset, directly influencing driveline efficiency and load-holding capacity in heavy-duty applications. When installed alongside the 4657101082: TRANSMISSION HOUSING, this component forms the critical control backbone for reliable power delivery.
Symptoms of Failure
- Erratic shift hunting or delayed engagement: A worn EST 37 A solenoid can cause the transmission to hunt between gears or hesitate when engaging drive, particularly under load.
- Intermittent loss of forward or reverse: Internal valve wear in the 6073.015.580 may lead to sudden pressure drops, resulting in temporary loss of drive direction without warning.
- Oil contamination from internal debris: Degraded seals within the unit can introduce metallic particles into the hydraulic circuit, often visible as dark or gritty fluid during inspection.
- Harsh or clunking shifts: Failed pressure regulation produces abrupt gear changes, which can accelerate wear on the 4657201166: HOUS.FRONT SECT and adjacent components.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 6073.015.580 |
| Designation | EST 37 A |
| Material | Anodized aluminum alloy with steel valve spools |
| Weight | 1.85 kg (4.08 lbs) |
| Dimensions (L x W x H) | 210 mm x 95 mm x 65 mm |
| Operating Pressure Range | 8–22 bar |
| Seal Type | NBR (Nitrile Butadiene Rubber) |
| OEM Reference | ZF 6073.015.580 |
Compatibility
This genuine EST 37 A unit is primarily designed for the ZF WG 230 series, but it also integrates with WG180, WG200, and WG250 transmissions due to shared hydraulic architecture. It mounts directly to the valve body interface within the 4657201170: HOUSING REAR PART and requires proper alignment with the 4657298102: HOUSING REAR SECTION for leak-free operation. Always verify the control unit revision against your transmission’s serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear and shaft assembly |
| 4657201166 | HOUS.FRONT SECT | Front section housing input shaft and pump drive |
| 4657201170 | HOUSING REAR PART | Rear casing supporting output flange and bearings |
| 4657298102 | HOUSING REAR SECTION | Secondary rear housing for PTO interface |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | Fastener for valve body to housing attachment |
| 4656301148 | FIXING PLATE | Retention plate for solenoid harness routing |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic return circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for pump suction line |
| 0636100803 | CAP SCREW | Bolt for securing control unit to valve body |
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