Overview
The ZF 6057.018.558 EST 37 A is a critical electro-hydraulic control unit specifically engineered for the WG 210 Series transmission. This OEM genuine part governs clutch pressure modulation and shift timing within the valve body assembly, ensuring precise gear engagement under heavy-duty loads. As a direct replacement for the original equipment, SKU 6057.018.558 restores factory shift quality and hydraulic stability. It integrates seamlessly with the TRANSMISSION HOUSING to maintain proper fluid routing and pressure integrity.
Symptoms of Failure
- Erratic or delayed gear engagement: When the EST 37 A solenoid wears, hydraulic pressure drops, causing hesitation when shifting from neutral to drive or reverse.
- Intermittent transmission slipping: Worn internal seals lead to pressure loss, resulting in RPM flare without corresponding acceleration under load.
- Harsh or jarring shifts: A failing unit fails to modulate clutch apply pressure, producing abrupt upshifts or downshifts that jolt the driveline.
- Visible ATF seepage at the valve body: Cracks in the solenoid housing or degraded O-rings allow transmission fluid to weep, often mistaken for a pan gasket leak.
Technical Specifications
| Part Number | 6057.018.558 |
| Designation | EST 37 A |
| Material | Anodized aluminum body with stainless steel spool |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 142 mm |
| Width | 68 mm |
| Height | 52 mm |
| OEM Reference | ZF 6057.018.558 |
| Operating Pressure | 12-18 bar |
| Connector Type | DIN 4-pin |
Compatibility
This EST 37 A solenoid is designed for the ZF WG 210 Series, but it also cross-fits select earlier and later models due to shared valve body architecture. Compatible transmissions include the WG180, WG200, WG210, and WG220 series. It is a direct fit for units originally equipped with the HOUS.FRONT SECT and the HOUSING REAR PART. For applications using the HOUSING REAR SECTION, verify the valve body revision before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing for pump and converter |
| 4657201170 | HOUSING REAR PART | Rear housing section for output shaft support |
| 4657298102 | HOUSING REAR SECTION | Alternate rear housing casting variant |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M10 fastener for valve body retention |
| 4656301148 | FIXING PLATE | Locating plate for solenoid mounting |
| 4657301032 | SCREEN SHEET | Fine mesh filter for valve body inlet |
| 4657301033 | SCREEN SHEET | Secondary filter for solenoid return line |
| 0636100803 | CAP SCREW | M8 fastener for screen sheet retention |
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