Overview
The ZF 6073.015.157 EST 37 A for WG210 is a precision-engineered solenoid valve assembly responsible for modulating hydraulic pressure within the clutch pack circuits of the WG series powershift transmission. This OEM genuine part, identified by SKU 6073.015.157, sits within the valve body or control manifold, translating electronic signals from the transmission control unit (TCU) into precise hydraulic actions. It directly governs shift timing and clutch engagement, ensuring smooth power delivery under heavy load conditions. The unit is often mounted adjacent to the HOUS.FRONT SECT and works in concert with the TRANSMISSION HOUSING to maintain internal oil routing integrity.
Symptoms of Failure
- Erratic or harsh shifting under load: When the EST 37 A valve spool sticks or the coil degrades, you will experience jarring gear engagements, particularly when transitioning between forward and reverse ranges.
- Delayed engagement or transmission slipping: A worn solenoid fails to build pressure quickly, causing a noticeable lag (2-4 seconds) before the transmission engages, or allowing the gear to slip during acceleration.
- Internal hydraulic oil leaks: Deteriorated O-rings or a cracked valve body on the 6073.015.157 can cause ATF to weep from the solenoid bore, often pooling near the HOUSING REAR PART interface.
- Intermittent fault codes (P07xx series): The TCU will log pressure control or solenoid circuit malfunctions, often triggering a limp-home mode that locks the transmission in a single gear.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 6073.015.157 |
| Designation | EST 37 A (Electro-Hydraulic Solenoid) |
| Operating Voltage | 12V / 24V (PWM controlled) |
| Coil Resistance | 5.2 – 6.8 Ohms @ 20°C |
| Max Operating Pressure | 22 bar (320 psi) |
| Housing Material | Hard-anodized aluminum with steel spool |
| Seal Material | Nitrile (NBR) / Viton |
| Weight | 0.42 kg (0.93 lbs) |
| Thread / Mounting | M8 x 1.25 bolt pattern |
Compatibility
This solenoid is primarily designed for the WG 210 Series transmission, but it also cross-fits several ZF powershift models that share the same valve body architecture. Verified compatible transmissions include the WG180, WG200, WG211, and WG310 series. It is a direct replacement for units requiring the EST 37 A valve, and it interfaces with the HOUSING REAR SECTION to complete the hydraulic circuit. Always verify your transmission serial number against the OEM parts list before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101080 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201167 | HOUS.FRONT SECT | Front section housing input shaft bearings |
| 4657201171 | HOUSING REAR PART | Rear housing covering output shaft |
| 4657298103 | HOUSING REAR SECTION | Extended rear housing for PTO mount |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M10 bolt for valve body retention |
| 4656301148 | FIXING PLATE | Locking plate for solenoid bracket |
| 4657301034 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 4657301035 | SCREEN SHEET | Coarse mesh pre-filter for pump suction |
| 0636100803 | CAP SCREW | M8 bolt for housing flange |
