Overview
The ZF 6073.015.332 EST 37 A for WG210 is a critical electro-hydraulic control unit that modulates clutch pressure and shift timing within the WG210 transmission series. This OEM genuine part, identified by SKU 6073.015.332, integrates directly with the valve body assembly to regulate fluid flow to planetary gear sets. It sits between the HOUS.FRONT SECT and the main housing, converting electrical signals from the transmission control module into precise hydraulic actions. Without this component, the transmission cannot execute gear changes or maintain torque converter lockup, making it essential for driveline reliability in heavy-duty commercial vehicles.
Symptoms of Failure
- Erratic shifting or gear hunting: When the EST 37 A solenoid wears, the transmission may slip between gears or fail to hold a selected ratio, especially under load on inclines.
- Delayed engagement from neutral to drive: A failing unit causes a 2–4 second lag when shifting from park or neutral, often accompanied by a harsh clunk as pressure builds unevenly.
- Transmission overheating with fluid discoloration: Internal leakage past the solenoid spool generates excess heat, turning transmission fluid dark brown and producing a burnt odor.
- Intermittent loss of reverse gear: Partial blockage in the hydraulic circuit prevents reverse clutch pack engagement, leaving the vehicle unable to back up despite forward gears working.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 6073.015.332 |
| OEM Reference | EST 37 A |
| Material | Hard-anodized aluminum body with stainless steel spool |
| Weight | 1.42 kg (3.13 lbs) |
| Operating Pressure | 8–22 bar (116–319 psi) |
| Coil Resistance | 5.2 ohms ± 0.3 ohms at 20°C |
| Seal Type | Viton O-rings (included) |
Compatibility
This genuine ZF 6073.015.332 EST 37 A is engineered for the WG210 series but also fits select WG180, WG200, and WG250 transmissions used in municipal trucks, refuse vehicles, and construction equipment. It replaces earlier EST 36 variants and is backward-compatible with housings such as the TRANSMISSION HOUSING and HOUSING REAR PART. For WG210 models built after 2018, verify that the HOUSING REAR SECTION has the updated dowel pin alignment to avoid installation interference.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train and valve body |
| 4657201166 | HOUS.FRONT SECT | Front section housing torque converter and pump |
| 4657201170 | HOUSING REAR PART | Rear casing supporting output shaft and PTO mount |
| 4657298102 | HOUSING REAR SECTION | Extended rear section for longer wheelbase applications |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing-to-valve body positioning |
| 0636100801 | CAP SCREW | M10 x 30 flange bolt for solenoid mounting |
| 4656301148 | FIXING PLATE | Retainer bracket securing solenoid harness |
| 4657301032 | SCREEN SHEET | Fine mesh filter for solenoid inlet port |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for return line |
| 0636100803 | CAP SCREW | M8 x 25 hex bolt for screen sheet retention |
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