Overview
The ZF 6073.015.252 EST 37 A is a critical electronic shift control unit specifically designed for the WG 190 Series transmission. This OEM genuine part governs the hydraulic actuation of clutch packs and shift valves, ensuring precise gear engagement under load. Positioned within the valve body assembly of the transmission, the EST 37 A interprets input signals from the vehicle’s ECU to modulate line pressure and shift timing. The SKU 6073.015.252 is the exact replacement for the original factory unit, guaranteeing seamless integration with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to maintain optimal drivetrain performance.
Symptoms of Failure
- Erratic shifting or gear hunting: When the EST 37 A fails, the transmission may struggle to find the correct gear, especially during uphill climbs or under heavy load, leading to delayed engagement.
- Transmission fluid overheating: A malfunctioning shift control unit can cause continuous clutch slip, generating excessive heat and triggering warning lights on the dashboard.
- Complete loss of forward or reverse gears: Internal electronic failure of the 6073.015.252 can result in a no-move condition, where the transmission defaults to a limp-home mode or refuses to engage any gear.
- Intermittent electrical faults: Corrosion or internal short circuits in the EST 37 A may cause sporadic error codes, such as “shift solenoid circuit malfunction,” that reset after ignition cycles.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 6073.015.252 |
| OEM Reference | ZF EST 37 A |
| Material | Die-cast aluminum housing with sealed electronic module |
| Weight | 1.2 kg (2.65 lbs) |
| Dimensions (L x W x H) | 180 mm x 120 mm x 45 mm |
| Operating Voltage | 12V / 24V DC |
| Connector Type | 40-pin AMP/TE |
| Torque Spec | 8 Nm (mounting bolts) |
Compatibility
This EST 37 A shift control unit is engineered for the ZF WG 190 Series, but it also cross-references with the WG 180, WG 200, and WG 210 transmission families that share the same valve body architecture. It is commonly used in off-highway trucks, agricultural tractors, and heavy-duty construction equipment. When replacing this unit, always inspect the HOUSING REAR PART and the HOUSING REAR SECTION for cracks or wear, as these components directly interface with the shift control module.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing input shaft |
| 4657201170 | HOUSING REAR PART | Rear section supporting output flange |
| 4657298102 | HOUSING REAR SECTION | Extended rear housing for PTO mount |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M10 fastener for housing assembly |
| 4656301148 | FIXING PLATE | Retains shift control module |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M8 bolt for valve body cover |
