Overview
The ZF 6057.018.552 EST 37 A for WG211 is a critical electro-hydraulic control unit designed to manage clutch pressure and shift timing within the WG series transmission. This OEM genuine part, identified by SKU 6057.018.552, sits directly on the valve body assembly and modulates oil flow to ensure smooth gear engagement. It works in concert with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to maintain hydraulic integrity under high torque loads.
Symptoms of Failure
- Erratic shifting or gear slippage: When the EST 37 A solenoid wears, hydraulic pressure becomes inconsistent, causing delayed or harsh shifts between gears.
- Transmission overheating: A failing control unit can cause the torque converter to remain partially locked, generating excessive heat and reducing fluid life.
- Oil leaks around the valve body: Degraded seals on the 6057.018.552 unit allow ATF to escape, often pooling near the HOUSING REAR PART interface.
- No engagement in forward or reverse: Complete solenoid failure prevents pilot pressure from reaching clutch packs, leaving the transmission in neutral.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 6057.018.552 |
| OEM Reference | EST 37 A for WG211 |
| Material | Aluminum alloy with steel spool |
| Weight | 1.2 kg (2.65 lbs) |
| Operating Pressure | 8–18 bar |
| Seal Type | NBR O-ring |
| Mounting Torque | 25 Nm |
Compatibility
This genuine ZF 6057.018.552 unit is engineered for the WG211 series but also fits WG180, WG200, and WG250 models that share the same valve body architecture. It is directly compatible with the CYLINDRICAL PIN that aligns the solenoid to the housing. Always verify your transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657301130 | HOUS.FRONT SECT | Front section housing the torque converter |
| 4657301131 | HOUSING REAR PART | Rear section supporting output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for valve body assembly |
| 0636102489 | CAP SCREW | M8 bolt for housing fastening |
| 4656301148 | FIXING PLATE | Secures solenoid wiring harness |
| 0636102463 | CAP SCREW | M6 bolt for valve body retention |
| 4657201133 | SCREEN SHEET | Filter mesh for hydraulic fluid |
| 0636115287 | CAP SCREW | M10 bolt for rear housing |
| 4657301065 | PLATE | Spacer plate between valve body sections |
Frequently Asked Questions
Q: Can I use the 6057.018.552 in a WG180 transmission?
A: Yes, this part is cross-compatible with WG180, WG200, and WG250 models that use the same EST 37 A solenoid interface. Always check the valve body casting number.
Q: What causes the EST 37 A solenoid to fail prematurely?
A: Contaminated ATF with metal debris or moisture is the primary cause. Replace the SCREEN SHEET filter simultaneously to prevent recurrence.
Q: Is this part interchangeable with the EST 37 B variant?
A: No. The EST 37 A (6057.018.552) has a different resistance rating and porting than the B variant. Using the wrong version can cause shift timing errors.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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