Overview
The ZF 6057.018.957 EST 37 A is an OEM genuine solenoid valve assembly engineered for precise hydraulic control within ZF’s heavy-duty powershift transmissions. This component, identified by SKU 6057.018.957, functions as an electro-hydraulic actuator that modulates clutch pressure and shift timing in construction machinery drivelines. Positioned within the transmission valve body, it converts electrical signals from the ECU into hydraulic flow, governing gear engagement and disengagement. As a factory-original part, it ensures exact OEM tolerances for reliable operation under high-load conditions.
Symptoms of Failure
When the ZF 6057.018.957 EST 37 A begins to degrade, operators will notice distinct operational disruptions. Common failure indicators include:
- Erratic gear engagement or delayed shifting – The transmission hesitates or slams into gear, particularly during cold starts, due to inconsistent solenoid response.
- Intermittent transmission slipping under load – The driveline loses torque momentarily when climbing grades or hauling heavy payloads, often misdiagnosed as clutch wear.
- Hydraulic fluid contamination or internal leakage – Worn seals within the solenoid allow ATF to bypass, causing low system pressure and visible drips near the valve body.
- Persistent diagnostic trouble codes (DTCs) – The ECU logs solenoid circuit faults (e.g., open circuit or short to ground) that cannot be cleared without replacing the unit.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 6057.018.957 |
| Designation | EST 37 A |
| OEM Reference | ZF 6057.018.957 |
| Coil Resistance (20°C) | 12.5 – 14.0 Ω |
| Operating Voltage | 12 VDC / 24 VDC |
| Max Operating Pressure | 25 bar (362 psi) |
| Body Material | Hard-anodized aluminum alloy |
| Seal Material | Nitrile rubber (NBR) / Viton |
| Overall Length | ~145 mm |
| Weight | 0.42 kg (0.93 lbs) |
Compatibility
This solenoid valve is designed for integration into ZF’s modular powershift transmission families used in construction machinery. Based on its EST 37 A designation and hydraulic flow characteristics, the 6057.018.957 is compatible with the following ZF transmission models:
- ZF WG180 – 6-speed powershift for wheel loaders and graders
- ZF WG200 – Heavy-duty variant for articulated dump trucks
- ZF 4WG-200 – 4-speed version used in excavators and dozers
- ZF 6WG-250 – High-torque transmission for large mining equipment
For exact fitment verification, cross-reference your transmission serial number with the OEM parts catalog. This part is not backward-compatible with older ZF 3WG or 4WG-100 series without adapter harness modifications.
