Overview
The ZF 6057.018.986 EST 37 A for WG211 is a precision-engineered solenoid valve assembly that governs hydraulic pressure modulation within the transmission control unit. This OEM genuine part, identified by SKU 6057.018.986, directly interfaces with the valve body to regulate clutch and brake application timing. It sits within the lower control section of the transmission, converting electrical signals from the TCU into precise hydraulic actions. For full structural integrity, this component is often mounted alongside the 4657101049: TRANSMISSION HOUSING and the 4657301130: HOUS.FRONT SECT, which provide the sealed environment necessary for consistent oil flow.
Symptoms of Failure
When the ZF 6057.018.986 EST 37 A begins to degrade, operators often report delayed or harsh gear engagement during cold starts. A second common indicator is intermittent transmission slipping under load, particularly when climbing grades or towing heavy trailers. You may also notice erratic shift patterns where the transmission hunts between gears without a clear command. Finally, internal hydraulic leaks can develop, leading to low line pressure warnings on the dashboard. These symptoms frequently occur when the solenoid spool wears against the 4657301131: HOUSING REAR PART, causing cross-port leakage.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 6057.018.986 |
| Designation | EST 37 A (Solenoid Valve) |
| Material | Hardened Steel Spool / Aluminum Body |
| Operating Voltage | 12V / 24V (PWM Controlled) |
| Weight | 0.45 kg (1.0 lb) |
| Seal Type | Nitrile O-Ring (Integrated) |
| OEM Reference | ZF 6057.018.986 |
Compatibility
This solenoid is engineered for the ZF WG211 series but shares hydraulic interfaces with earlier WG180 and WG200 variants. It is directly compatible with WG211, WG212, and WG213 models produced after 2015. For WG180 and WG200 transmissions, verify the valve body bore diameter matches the EST 37 A spool length. The assembly requires the 0631306816: CYLINDRICAL PIN for precise alignment during installation. Do not use this part in WG150 or WG160 series without consulting the ZF parts catalog.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Encloses gear train and valve body |
| 4657301130 | HOUS.FRONT SECT | Front section of main housing |
| 4657301131 | HOUSING REAR PART | Rear section supporting output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636102489 | CAP SCREW | Fastener for valve body retention |
| 4656301148 | FIXING PLATE | Secures solenoid harness bracket |
| 0636102463 | CAP SCREW | Mounting bolt for housing cover |
| 4657201133 | SCREEN SHEET | Oil filter mesh for solenoid inlet |
| 0636115287 | CAP SCREW | Fastener for rear housing section |
| 4657301065 | PLATE | Spacer plate for solenoid stack |
Frequently Asked Questions
Q: Can I replace the ZF 6057.018.986 without removing the transmission?
A: Yes, in most WG211 applications, the solenoid is accessible after dropping the transmission oil pan and removing the valve body cover. You will need to disconnect the wiring harness and remove the 0636102489: CAP SCREW that secures the solenoid bracket.
Q: What is the expected service life of this EST 37 A solenoid?
A: Under normal operating conditions with clean ATF, the solenoid typically lasts 150,000 to 200,000 miles. Contaminated fluid or electrical spikes can reduce this lifespan significantly.
Q: Does this part include the mounting hardware?
A: No, the 6057.018.986 is supplied as a bare solenoid. You must reuse or order the 0631306816: CYLINDRICAL PIN and 4656301148: FIXING PLATE separately for proper installation.
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