Overview
The ZF 6073.015.364 EST 37 A is a critical electro-hydraulic control unit specifically engineered for the WG 210 Series transmission. This genuine OEM part, identified by SKU 6073.015.364, governs the precise modulation of clutch pressure and shift timing within the gearbox. It sits directly on the valve body assembly, acting as the interface between the transmission control module and the hydraulic circuits. When functioning correctly, it ensures seamless gear engagement and optimal torque delivery. This component is often serviced alongside the TRANSMISSION HOUSING to maintain internal pressure integrity.
Symptoms of Failure
- Erratic shift quality or gear hunting: A failing EST 37 A unit causes the transmission to hesitate or slam between gears, particularly under load. This is a common search query for “WG210 transmission shift hesitation.”
- Delayed engagement from Park to Drive: If the solenoid pack loses hydraulic seal, you will experience a noticeable lag of 2-4 seconds before the transmission engages, often paired with a “transmission slipping after warm-up” complaint.
- Transmission fluid contamination or burnt odor: Internal wear of the EST 37 A can introduce metallic debris into the oil, leading to a burnt smell. This symptom frequently accompanies failures of the HOUS.FRONT SECT due to debris migration.
- No upshift in automatic mode: The transmission may remain stuck in first or second gear, triggering a limp-home mode. This is a direct indicator that the electro-hydraulic modulation has failed.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 6073.015.364 |
| Designation | EST 37 A |
| Material | High-grade aluminum alloy with hardened steel spool |
| Weight | 1.45 kg (3.2 lbs) |
| Operating Pressure Range | 5 – 22 bar |
| Seal Type | PTFE energized lip seals |
| Related Fastener | CAP SCREW (M8 x 25mm) |
| Related Pin | CYLINDRICAL PIN (alignment dowel) |
Compatibility
This genuine ZF part is primarily designed for the WG 210 Series transmission. It is also compatible with the WG180 and WG200 series when used with the appropriate valve body adapter plate. The EST 37 A unit interfaces directly with the HOUSING REAR PART and the HOUSING REAR SECTION to form the complete hydraulic control block. It is not backward compatible with the older WG150 series without significant modification to the wiring harness.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201166 | HOUS.FRONT SECT | Front section housing for pump and converter |
| 4657201170 | HOUSING REAR PART | Rear structural support for output shaft |
| 4657298102 | HOUSING REAR SECTION | Extension housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for valve body positioning |
| 0636100801 | CAP SCREW | Fastener for solenoid pack retention |
| 4656301148 | FIXING PLATE | Locking plate for valve body bolts |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic oil |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100803 | CAP SCREW | M10 bolt for housing flange |
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