Overview
The ZF 6057.018.946 EST 37 A for WG211 is a precision-engineered solenoid valve assembly that regulates hydraulic pressure within the transmission control unit. Positioned within the valve body of the WG211 series, this OEM genuine part modulates clutch and brake application for smooth gear shifts under heavy loads. The SKU 6057.018.946 ensures exact fitment and OEM-spec performance, directly interfacing with the TRANSMISSION HOUSING to maintain consistent oil flow. Without this component, the transmission cannot execute electronic shift commands, leading to erratic operation or complete loss of drive.
Symptoms of Failure
- Delayed or harsh shifting – When the EST 37 A solenoid fails, hydraulic pressure fluctuates, causing noticeable lag or jarring engagement between gears, especially under load.
- Transmission slipping in higher gears – A worn valve cannot hold pressure, resulting in the transmission slipping out of gear during highway driving or uphill climbs.
- Oil leaks near the valve body – Internal seal degradation on the 6057.018.946 allows ATF to seep past, leaving puddles under the bell housing and reducing fluid levels.
- Check engine or transmission warning light – The ECU detects abnormal solenoid resistance or pressure deviations, triggering fault codes that limit vehicle speed to limp mode.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 6057.018.946 |
| Designation | EST 37 A |
| Material | Hard-anodized aluminum body with stainless steel spool |
| Weight | 0.45 kg (1.0 lb) |
| Operating Pressure | 8–22 bar |
| Coil Resistance | 5.2 Ω ± 0.3 Ω at 20°C |
| Seal Type | Viton O-rings (included) |
Compatibility
This solenoid is designed for the ZF WG211 series but also fits select WG180, WG200, and WG210 variants that share the same valve body architecture. It is a direct replacement for transmissions in off-highway trucks, cranes, and heavy-duty agricultural equipment. Always verify the housing interface; the HOUS.FRONT SECT and HOUSING REAR PART must align correctly to avoid cross-threading. The CYLINDRICAL PIN secures the solenoid in its bore, preventing rotational movement during high-vibration operation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Encloses the gear train and valve body assembly |
| 4657301130 | HOUS.FRONT SECT | Front section of the main housing, supports input shaft |
| 4657301131 | HOUSING REAR PART | Rear housing section, contains output bearing pockets |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for solenoid and housing bores |
| 0636102489 | CAP SCREW | M8 bolt securing valve body to housing |
| 4656301148 | FIXING PLATE | Retains solenoid wiring harness connector |
| 0636102463 | CAP SCREW | M6 bolt for front housing attachment |
| 4657201133 | SCREEN SHEET | Mesh filter protecting solenoid from debris |
| 0636115287 | CAP SCREW | M10 bolt for rear housing flange |
| 4657301065 | PLATE | Spacer plate between valve body and housing |
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