Overview
The ZF 6073.015.277 EST 37 A for WG210 is a critical electro-hydraulic control unit that manages clutch pressure and shift timing within the WG series transmission. Positioned on the valve body assembly, this OEM genuine part regulates oil flow to ensure smooth gear engagement under heavy-duty loads. The SKU 6073.015.277 is engineered specifically for the WG210 model, providing precise modulation of hydraulic circuits to prevent torque converter lockup issues. When paired with the TRANSMISSION HOUSING (4657101082), this unit maintains structural integrity during high-pressure operations. Its solenoid-driven design directly interfaces with the transmission control module, making it indispensable for reliable power delivery in commercial vehicles.
Symptoms of Failure
- Delayed or harsh shifting: A worn EST 37 A causes erratic clutch engagement, leading to noticeable jerks between gears during acceleration or deceleration.
- Transmission fluid leaks: Degraded seals on the 6073.015.277 unit allow ATF to escape near the valve body, leaving puddles under the vehicle and reducing hydraulic pressure.
- Intermittent gear slipping: When this part fails, the transmission may momentarily lose drive power in higher gears, especially under load or on inclines.
- Check engine or transmission warning lights: Faulty solenoid resistance triggers diagnostic trouble codes (DTCs), often accompanied by reduced fuel economy or limp mode activation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 6073.015.277 |
| Designation | EST 37 A |
| Material | Aluminum alloy with steel solenoid core |
| Weight | 1.2 kg (2.65 lbs) |
| Dimensions (L x W x H) | 180 x 95 x 65 mm |
| OEM Reference | ZF 6073.015.277 |
| Operating Pressure | 8–18 bar |
| Temperature Range | -40°C to +120°C |
Compatibility
This EST 37 A unit is primarily designed for the ZF WG210 series, but it also fits select variants in the WG180, WG200, and WG211 families. It is commonly used in bus, truck, and off-highway applications where the WG210 transmission is installed. For proper sealing and alignment, always verify compatibility with the HOUS.FRONT SECT (4657201166) and the HOUSING REAR PART (4657201170). In some configurations, the HOUSING REAR SECTION (4657298102) is also required to complete the assembly. Always cross-reference your transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Encloses and protects internal gear sets |
| 4657201166 | HOUS.FRONT SECT | Front section of the transmission casing |
| 4657201170 | HOUSING REAR PART | Rear casing component for torque converter |
| 4657298102 | HOUSING REAR SECTION | Alternate rear housing for specific models |
| 0631306816 | CYLINDRICAL PIN | Aligns and secures housing sections |
| 0636100801 | CAP SCREW | Fastens valve body to housing |
| 4656301148 | FIXING PLATE | Retains solenoid assembly in position |
| 4657301032 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4657301033 | SCREEN SHEET | Secondary filtration for oil passages |
| 0636100803 | CAP SCREW | Mounting bolt for control unit |
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