Overview
The ZF 6073.015.513 EST 37 A for WG191 is a critical OEM genuine component engineered to manage hydraulic pressure modulation within the transmission control system. This part functions as a pressure-regulating solenoid or valve assembly, ensuring precise clutch and brake application during gear shifts. Positioned within the valve body of the WG191 series, it directly influences shift quality and torque converter lockup behavior. The SKU 6073.015.513 is a factory-sealed unit, guaranteeing exact fitment and performance specifications required for heavy-duty industrial applications.
Symptoms of Failure
- Erratic or harsh shifting: When the EST 37 A begins to fail, you may notice delayed engagement or abrupt gear changes, particularly under load. This is often caused by inconsistent hydraulic pressure regulation.
- Transmission overheating: A worn 6073.015.513 can cause the torque converter clutch to slip, generating excessive heat. This symptom is frequently searched as “ZF transmission overheating WG191.”
- Oil leaks near valve body: Internal seal degradation around this part can lead to ATF seepage, often visible as drips from the transmission pan or bell housing area.
- Loss of power in specific gears: If the solenoid fails to maintain pressure, you may experience a complete loss of drive in forward or reverse gears, a common issue flagged as “ZF WG191 no reverse.”
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 6073.015.513 |
| OEM Reference | EST 37 A for WG191 |
| Material | Hardened steel body with anodized aluminum spool |
| Weight | 0.45 kg (1.0 lb) |
| Operating Pressure | 8–22 bar (116–319 psi) |
| Seal Type | Viton O-rings (included) |
| Thread Size | M12 x 1.5 mounting |
Compatibility
This genuine ZF part is primarily designed for the WG191 series, but it also cross-fits into several other ZF industrial transmissions. Based on its hydraulic control architecture, the 6073.015.513 is compatible with the WG180, WG200, and WG211 models. It is also used in certain Ecomat 4HP and 6HP variants where the valve body layout matches the EST 37 A specification. Always verify your transmission serial number before installation.
When replacing this solenoid, it is recommended to inspect the TRANSMISSION HOUSING for cracks or wear, as housing distortion can affect solenoid alignment. Additionally, the HOUS.FRONT SECT and HOUSING REAR PART must be free of debris to ensure proper sealing. Finally, the CYLINDRICAL PIN that locates the solenoid should be replaced if any scoring is visible.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear sets and valve body |
| 4657301130 | HOUS.FRONT SECT | Front section housing the torque converter and pump |
| 4657301131 | HOUSING REAR PART | Rear section supporting output shaft and bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for solenoid and valve body positioning |
| 0636102489 | CAP SCREW | Fastener for securing solenoid to valve body |
| 4656301148 | FIXING PLATE | Retaining plate for solenoid harness connector |
| 0636102463 | CAP SCREW | Bolt for mounting valve body to transmission housing |
| 4657201133 | SCREEN SHEET | Filter mesh protecting solenoid from debris |
| 0636115287 | CAP SCREW | Hex bolt for rear housing attachment |
| 4657301065 | PLATE | Spacer plate between valve body and housing |
Frequently Asked Questions
Q: Can the 6073.015.513 be tested before installation?
A: Yes. Using a multimeter, measure resistance across the solenoid terminals. Expected value is 4.5–6.0 ohms at 20°C. If open or shorted, the unit is defective.
Q: Is this part interchangeable with the EST 37 B variant?
A: No. The EST 37 A (6073.015.513) uses a different pressure curve than the B variant. Installing the wrong version can cause transmission damage. Always match the exact OEM number.
Q: How often should this solenoid be replaced?
A: ZF recommends inspection every 500,000 km or 10,000 operating hours. Replace if any shift quality degradation is observed, or during a full transmission overhaul.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
