Overview
The ZF 6073.015.546 EST 37 A for WG190 is a precision-engineered solenoid valve assembly that controls hydraulic pressure modulation within the transmission’s electronic control system. This OEM genuine part, identified by SKU 6073.015.546, sits directly in the valve body of the WG 190 Series, regulating clutch engagement and shift timing. It ensures smooth gear transitions under heavy load conditions, making it critical for maintaining driveline integrity in commercial vehicles. When paired with a robust TRANSMISSION HOUSING, this component forms the core of the hydraulic control network.
Symptoms of Failure
- Erratic shift hesitation under load: A failing EST 37 A causes delayed or harsh upshifts, especially when climbing grades or hauling maximum payloads.
- Intermittent gear slippage in 3rd and 4th: Worn internal seals lead to pressure loss, resulting in momentary loss of torque during cruising speeds.
- Transmission fluid contamination from internal wear: Degraded solenoid plungers generate metallic debris, visible as dark particles in the oil pan during routine checks.
- Persistent diagnostic trouble codes (DTCs) for pressure control: The ECU logs P0745 or P0748 codes, indicating the solenoid circuit is out of range.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 6073.015.546 |
| OEM Reference | EST 37 A |
| Material | Hard-anodized aluminum body with stainless steel plunger |
| Weight | 0.42 kg (0.93 lbs) |
| Operating Pressure | 8–18 bar |
| Coil Resistance | 5.2 Ω ± 0.3 Ω at 20°C |
| Seal Type | Viton® O-rings (pre-installed) |
| Thread Size | M12 x 1.5 mounting bore |
Compatibility
This solenoid is engineered for the ZF WG 190 Series but also fits WG180, WG200, and WG210 transmissions with the same valve body architecture. It is a direct replacement for units requiring the EST 37 A calibration. For full assembly integrity, always inspect the HOUS.FRONT SECT for cracks and verify the HOUSING REAR PART alignment before installation. In WG190 builds, the HOUSING REAR SECTION must be torqued to spec to prevent cross-threading the solenoid bore.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear sets and valve body |
| 4657201166 | HOUS.FRONT SECT | Front section housing the input shaft and pump |
| 4657201170 | HOUSING REAR PART | Rear casing supporting output flange and PTO mount |
| 4657298102 | HOUSING REAR SECTION | Intermediate rear housing for planetary carrier |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M10 bolt for valve body retention |
| 4656301148 | FIXING PLATE | Locking plate for solenoid harness connector |
| 4657301032 | SCREEN SHEET | Fine mesh filter for valve body oil gallery |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for pump suction |
| 0636100803 | CAP SCREW | M8 bolt for solenoid bracket mounting |
