Overview
The ZF 6073.015.162 EST 37 A for WG190 is a critical electro-hydraulic control unit designed to manage clutch pressure modulation and shift timing within the WG190 transmission series. This OEM genuine part, identified by SKU 6073.015.162, integrates directly with the main valve body to ensure precise gear engagement under varying load conditions. It acts as the central interface between the transmission control module and the hydraulic actuation system, making it indispensable for maintaining smooth power delivery in heavy-duty applications. When paired with the TRANSMISSION HOUSING, this component ensures that hydraulic circuits remain sealed and responsive.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn EST 37 A unit often causes noticeable lag when shifting from neutral to drive, or produces jarring shifts under acceleration.
- Intermittent transmission slipping: As internal solenoids degrade, the transmission may momentarily lose torque transfer, particularly during uphill climbs or under heavy payloads.
- Erratic shift patterns: The unit may fail to regulate pressure consistently, leading to unexpected upshifts or downshifts at highway speeds.
- Hydraulic fluid contamination: Internal seal failure can allow debris to enter the valve body, accelerating wear on adjacent components like the HOUS.FRONT SECT and the HOUSING REAR PART.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 6073.015.162 |
| OEM Reference | EST 37 A |
| Material | Anodized aluminum body with steel solenoid cores |
| Weight | 1.8 kg (4.0 lbs) |
| Operating Pressure Range | 8–22 bar |
| Temperature Range | -40°C to +120°C |
| Mounting Torque | 25 Nm (18.4 lb-ft) |
Compatibility
This EST 37 A control unit is primarily engineered for the ZF WG190 series, but it also shares hydraulic interface patterns with the WG180 and WG200 transmissions. It is commonly used in municipal trucks, refuse vehicles, and medium-duty construction equipment. For proper installation, the unit must be aligned with the HOUSING REAR SECTION to maintain correct solenoid stroke distances. Always verify the transmission serial number before ordering, as minor revisions exist between early and late WG190 builds.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101079 | TRANSMISSION HOUSING | Encloses gear train and valve body |
| 4657201166 | HOUS.FRONT SECT | Front section housing for pump and converter |
| 4657201169 | HOUSING REAR PART | Rear housing supporting output shaft |
| 4657298104 | HOUSING REAR SECTION | Lower rear housing for oil pan interface |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for valve body positioning |
| 0636100801 | CAP SCREW | M8 bolt for housing fastening |
| 4656301148 | FIXING PLATE | Retains solenoid harness connectors |
| 4657301032 | SCREEN SHEET | Fine mesh filter for valve body inlet |
| 4657301033 | SCREEN SHEET | Coarse mesh filter for return line |
| 0636100803 | CAP SCREW | M10 bolt for solenoid mounting |
Frequently Asked Questions
Q: Can the 6073.015.162 be repaired, or must it be replaced?
A: Due to the precision calibration of internal solenoids and pressure sensors, ZF recommends full replacement rather than repair. Attempting to rebuild this unit often leads to shift quality issues.
Q: How does this part interact with the transmission housing?
A: The EST 37 A mounts directly onto the TRANSMISSION HOUSING via four bolts, with O-ring seals preventing cross-contamination between hydraulic circuits.
Q: What is the typical lifespan of this control unit?
A: In normal municipal service with regular fluid changes, the unit typically lasts 300,000–400,000 km. Contaminated fluid or frequent overloading can reduce this to 150,000 km.
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Phone: +86 158 2286 3467 |
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