Overview
The ZF 6073.015.118 EST 37 A is a critical electro-hydraulic control unit designed specifically for the WG 210 series transmissions. This OEM genuine part governs shift timing, pressure modulation, and clutch engagement within the transmission’s valve body assembly. As the brain of the hydraulic system, the EST 37 A ensures smooth gear transitions under heavy load conditions. The SKU 6073.015.118 is factory-calibrated to match ZF’s exact tolerances, making it a direct replacement for worn units. When installed alongside a properly sealed TRANSMISSION HOUSING, this component maintains consistent oil flow to the clutch packs and torque converter.
Symptoms of Failure
- Erratic shift timing or delayed engagement – The EST 37 A loses its ability to regulate hydraulic pressure, causing harsh or delayed shifts between gears, especially when the transmission is cold.
- Intermittent loss of drive in forward gears – Worn solenoids or internal seals within the 6073.015.118 can cause pressure drops, leading to clutch slip and a temporary inability to transmit torque.
- Transmission fluid contamination from internal debris – Degraded O-rings or valve spools in the EST 37 A shed particles into the oil, which can clog the SCREEN SHEET and accelerate wear on other components.
- Check engine or transmission warning light activation – Faulty electrical feedback from the unit triggers diagnostic trouble codes related to shift solenoid performance or pressure control.
Technical Specifications
| Part Number | 6073.015.118 |
| Designation | EST 37 A (Electro-Hydraulic Shift Unit) |
| Material | Die-cast aluminum housing with steel valve spools |
| Weight | 2.8 kg (6.2 lbs) |
| Dimensions (L x W x H) | 210 mm x 140 mm x 95 mm |
| OEM Reference | ZF 6073.015.118 |
| Operating Pressure Range | 8–18 bar (116–261 psi) |
| Temperature Range | -30°C to +120°C |
Compatibility
This EST 37 A unit is engineered for the ZF WG 210 series, but it also cross-fits several other ZF powershift models that share the same valve body architecture. Compatible transmissions include the WG 180, WG 200, WG 210, and WG 220 series used in construction and agricultural machinery. It is not compatible with the older WG 120 or WG 150 series without modification. For a complete rebuild, always inspect the HOUS.FRONT SECT and HOUSING REAR PART for cracks or warping, as these housings directly support the EST 37 A’s mounting flange. Additionally, verify that the SPEEDOMETER drive gear is intact, as its signal is used by the EST 37 A for shift timing calculations.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657107003 | SPEEDOMETER | Provides output shaft speed signal to the EST 37 A |
| 4657101039 | TRANSMISSION HOUSING | Main structural casing that encloses the valve body and gears |
| 4657201028 | HOUS.FRONT SECT | Front section housing the torque converter and pump |
| 4657201013 | HOUSING REAR PART | Rear section supporting the output shaft and PTO |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for precise valve body positioning |
| 0636100801 | CAP SCREW | M10 fastener for securing the EST 37 A to the housing |
| 4656301148 | FIXING PLATE | Retaining plate for the shift solenoid assembly |
| 4657301034 | SCREEN SHEET | Fine mesh filter protecting the EST 37 A from debris |
| 4657301035 | SCREEN SHEET | Secondary coarse filter for high-flow return lines |
| 0636100803 | CAP SCREW | M8 fastener for the screen sheet retaining bracket |
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