Overview
The ZF 6057.018.907 EST 37 A for WG191 is a critical electro-hydraulic control unit designed to manage clutch pressure modulation and shift timing within the WG191 transmission series. This OEM genuine part, identified by SKU 6057.018.907, integrates directly with the valve body assembly to regulate fluid flow to planetary gear sets. It sits between the main transmission housing and the front section, ensuring precise engagement of forward and reverse clutches. Without this component, the transmission cannot achieve proper gear ratio transitions, making it essential for maintaining driveline efficiency in heavy-duty commercial vehicles.
Symptoms of Failure
- Erratic shifting or gear slipping under load: When the EST 37 A solenoid wears, hydraulic pressure drops, causing delayed or harsh shifts during acceleration.
- Transmission overheating due to constant clutch slip: A failing unit fails to maintain lock-up, generating excessive heat and triggering warning lights.
- Intermittent loss of reverse gear engagement: Worn internal seals allow fluid bypass, making reverse gear engagement unpredictable or impossible.
- Visible oil leaks near the valve body cover: Cracks in the solenoid housing or degraded O-rings cause ATF to seep from the HOUS.FRONT SECT interface.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 6057.018.907 |
| OEM Reference | EST 37 A for WG191 |
| Material | Aluminum alloy with hardened steel spool |
| Weight | 1.2 kg (2.65 lbs) |
| Operating Pressure | 8–22 bar |
| Seal Type | Nitrile rubber (NBR) O-rings |
| Compatible Housing | TRANSMISSION HOUSING |
Compatibility
This genuine ZF part is engineered for the WG191 series but also fits select variants in the WG180 and WG200 families when used with the correct HOUSING REAR PART. It is compatible with WG180-100, WG200-120, and all WG191 sub-models (A through E). For proper installation, ensure the CYLINDRICAL PIN aligns the unit with the valve body bore. Always verify your transmission serial number against ZF’s parts catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657301130 | HOUS.FRONT SECT | Front section housing for pump and converter |
| 4657301131 | HOUSING REAR PART | Rear section enclosing output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for valve body |
| 0636102489 | CAP SCREW | Fastener for housing cover |
| 4656301148 | FIXING PLATE | Retains solenoid assembly |
| 0636102463 | CAP SCREW | Mounting bolt for rear housing |
| 4657201133 | SCREEN SHEET | Filter mesh for hydraulic circuit |
| 0636115287 | CAP SCREW | Bolt for valve body attachment |
| 4657301065 | PLATE | Spacer plate between housing sections |
Frequently Asked Questions
Q: Can I use the ZF 6057.018.907 in a WG180 transmission?
A: Yes, but only if the transmission has been updated with the WG191 valve body kit. You must also replace the HOUS.FRONT SECT to accommodate the solenoid bore.
Q: How do I test if the EST 37 A solenoid is faulty?
A: Measure resistance across the solenoid terminals; it should read 4.5–6.0 ohms at 20°C. Out-of-range values indicate internal shorting or an open circuit.
Q: Is the 6057.018.907 interchangeable with the EST 37 B variant?
A: No. The “A” variant uses a different spool stroke length. Installing the wrong version will cause shift timing errors and potential damage to the TRANSMISSION HOUSING.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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