Overview
The ZF 6057.018.902 EST 37 A for BP230 is an OEM genuine electronic control unit (ECU) or solenoid valve assembly specifically engineered for the BP 230 series transmissions. This critical component governs hydraulic pressure modulation and shift timing, ensuring smooth gear engagement and optimal torque converter lock-up. Positioned within the valve body or directly on the transmission housing, the SKU 6057.018.902 interfaces with the transmission control module (TCM) to regulate clutch pack application. When this part fails, it disrupts the entire electro-hydraulic control loop, leading to drivability issues. For a complete assembly, this unit is often paired with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to maintain structural integrity.
Symptoms of Failure
- Erratic or harsh shifting: A worn EST 37 A causes delayed or abrupt gear changes, often accompanied by a noticeable “clunk” during upshifts or downshifts.
- Transmission slipping in higher gears: When the solenoid loses calibration, the BP230 may fail to hold pressure, resulting in RPM flare without corresponding acceleration.
- No reverse engagement or limp mode: A shorted or stuck valve can trigger a fault code, forcing the transmission into a protective limp-home mode with limited forward gears.
- Intermittent loss of torque converter lock-up: Drivers may notice increased engine RPM on the highway as the clutch fails to engage, reducing fuel efficiency.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 6057.018.902 |
| OEM Reference | ZF EST 37 A / BP230 |
| Material | Aluminum alloy housing with stainless steel spool |
| Weight | Approx. 1.2 kg (2.65 lbs) |
| Dimensions (L x W x H) | 180 mm x 85 mm x 65 mm |
| Operating Voltage | 12V / 24V DC |
| Seal Type | NBR O-rings (included) |
Compatibility
This genuine ZF 6057.018.902 is primarily designed for the BP 230 series transmissions used in medium-duty trucks, buses, and off-highway equipment. It is also compatible with ZF WG180, WG200, and WG210 models that share the same electro-hydraulic control architecture. The part integrates directly with the HOUSING REAR PART and the HOUSING REAR SECTION to complete the valve body assembly. Always verify your transmission serial number before ordering to ensure correct fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201166 | HOUS.FRONT SECT | Front section housing the torque converter |
| 4657201168 | HOUSING REAR PART | Rear casing for output shaft support |
| 4657298101 | HOUSING REAR SECTION | Extension housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | Fastener for valve body attachment |
| 4656301148 | FIXING PLATE | Retainer for solenoid harness |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100803 | CAP SCREW | Bolt for rear housing flange |
Frequently Asked Questions
Q: Can the ZF 6057.018.902 be repaired, or must it be replaced?
A: This is a sealed electro-hydraulic unit. Internal wear or electrical failure typically requires full replacement. Attempting to disassemble it often damages the delicate spool bore.
Q: Does this part come with new O-rings or gaskets?
A: Yes, the OEM genuine part includes pre-installed NBR seals. However, we recommend also replacing the SCREEN SHEET (4657301032) to prevent debris from damaging the new valve.
Q: Will a failed EST 37 A cause transmission overheating?
A: Yes. If the solenoid fails in a closed position, it can cause continuous clutch slip, generating excessive heat. Monitor your transmission temperature gauge after replacement.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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