Overview
The ZF 6073.015.223 EST 37 A for WG160 is a precision-engineered electro-hydraulic control unit that manages clutch engagement and shift timing within the WG160 transmission series. This OEM genuine part, identified by SKU 6073.015.223, acts as the central command interface between the transmission control module and the hydraulic actuation system. It ensures smooth gear transitions under heavy load conditions by modulating oil pressure to the clutch packs. The EST 37 A assembly is mounted directly onto the TRANSMISSION HOUSING, where it interfaces with the main valve body to regulate fluid flow. Without this component, the transmission cannot execute electronic shift commands, making it critical for automated manual transmission (AMT) functionality in commercial vehicles.
Symptoms of Failure
- Delayed or harsh shifting under load: When the EST 37 A solenoid wears, hydraulic pressure to clutches becomes inconsistent, causing jarring gear changes or hesitation during acceleration.
- Transmission stuck in limp mode: A failing unit triggers fault codes that force the gearbox into a single gear, limiting vehicle speed to 30-40 km/h for protection.
- Intermittent loss of gear engagement: Worn internal seals within the 6073.015.223 allow oil to bypass, resulting in neutral drops or unexpected disengagement on inclines.
- Oil contamination from degraded seals: Internal rubber components break down over time, sending debris into the hydraulic circuit and clogging the SCREEN SHEET (4656301016).
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 6073.015.223 (EST 37 A) |
| Material | Die-cast aluminum housing with nitrile rubber seals |
| Weight | 2.4 kg (5.3 lbs) |
| Operating Pressure | 8-12 bar (116-174 psi) |
| Temperature Range | -40°C to +120°C |
| Voltage Rating | 24V DC (12V compatible with adapter) |
| Thread Size (mounting) | M8 x 1.25 |
| OEM Reference | ZF 6073.015.223 |
Compatibility
This EST 37 A unit is primarily designed for the WG160 series but also fits select variants of the WG180 and WG200 transmissions produced after 2012. It is compatible with ZF’s Ecomat and Ecolife architectures that use a 37-pin connector interface. The part integrates with the HOUS.FRONT SECT (4656201075) and the HOUSING REAR PART (4656201077) to form a sealed hydraulic chamber. For WG200 applications, verify that the HOUSING REAR SECTION (4656298049) matches the bolt pattern of your unit. Always cross-reference your transmission serial number with ZF’s ETM catalog before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4656201075 | HOUS.FRONT SECT | Front section enclosing torque converter |
| 4656201077 | HOUSING REAR PART | Rear housing supporting output shaft |
| 4656298049 | HOUSING REAR SECTION | Extended rear section for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 4656301148 | FIXING PLATE | Retains valve body to housing |
| 0636100817 | CAP SCREW | M10 bolt for housing fastening |
| 4656301016 | SCREEN SHEET | Fine mesh filter for oil return line |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for suction side |
| 0636100803 | CAP SCREW | M8 bolt for solenoid cover plate |
Frequently Asked Questions
Q: Can the 6073.015.223 be repaired, or must it be replaced?
A: This unit is sealed and non-serviceable. Internal solenoid coil failure or seal degradation requires complete replacement. Attempting repair often leads to hydraulic cross-leakage.
Q: How do I verify if this EST 37 A fits my WG160 transmission?
A: Check the 37-pin connector orientation—it must align with the harness bracket on your HOUS.FRONT SECT. Also measure the mounting hole spacing: 85 mm center-to-center for M8 bolts.
Q: What causes premature failure of this part?
A: Contaminated transmission fluid is the primary cause. Worn SCREEN SHEET filters allow debris to abrade the solenoid plunger, leading to stuck valves.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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