Overview
The ZF 6073.015.292 EST 37 A for WG171 is a critical electro-hydraulic control unit designed to manage shift timing and clutch pressure within the WG 171 series transmission. This OEM genuine part, identified by SKU 6073.015.292, integrates directly with the valve body assembly to regulate oil flow for smooth gear engagement. It works in tandem with the TRANSMISSION HOUSING to ensure proper alignment of internal components, while the HOUS.FRONT SECT provides structural support for the control module. Without this part, the transmission cannot maintain consistent hydraulic pressure, leading to erratic shifting behavior.
Symptoms of Failure
- Delayed or harsh shifting: When the EST 37 A wears out, operators often report a noticeable lag between gear changes or a jarring engagement, especially under load.
- Transmission fluid leaks near the valve body: A degraded seal on the 6073.015.292 unit can cause oil to seep past the SCREEN SHEET, leaving puddles under the vehicle.
- Erratic gear slipping in high torque conditions: Internal wear prevents the solenoid from holding pressure, causing the transmission to slip out of gear during uphill climbs or heavy hauling.
- Intermittent loss of drive: A failing EST 37 A can cause the transmission to suddenly drop into neutral without warning, a symptom often linked to clogged passages near the TUBE assembly.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 6073.015.292 |
| OEM Reference | EST 37 A for WG171 |
| Material | Hardened steel body with aluminum solenoid housing |
| Weight | 1.8 kg (3.97 lbs) |
| Dimensions | 210 mm x 95 mm x 65 mm |
| Operating Pressure | 12–18 bar |
| Temperature Range | -20°C to +120°C |
Compatibility
This OEM genuine part is specifically engineered for the ZF WG 171 series, but it also fits select variants of the WG 180 and WG 200 transmissions due to shared valve body architecture. It is commonly used in off-highway vehicles such as dump trucks, loaders, and agricultural tractors. For proper installation, ensure the TRANSMISSION HOUSING is free of debris and that the HOUS.FRONT SECT is torqued to factory specifications. The 6073.015.292 unit is not backward-compatible with older WG 150 models without a full valve body retrofit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Encloses and aligns all internal gear sets and shafts |
| 4656301066 | HOUS.FRONT SECT | Front section housing that supports the torque converter and pump |
| 4656201015 | SCREEN SHEET | Fine mesh filter that protects the valve body from debris |
| 4656301037 | TUBE | Hydraulic fluid passage tube connecting the pump to the control unit |
| 0634313514 | O-RING | Seals the hydraulic connections to prevent fluid leaks |
| 0636100803 | CAP SCREW | Fastener for securing the valve body cover plate |
| 4656301042 | HOUSING REAR PART | Rear housing section that encloses the output shaft and bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise positioning of the housing sections |
| 0636100801 | CAP SCREW | Bolt used to attach the solenoid bracket to the housing |
| 0636100160 | CAP SCREW | Mounting screw for the oil pan and filter assembly |
Frequently Asked Questions
Q: Can the ZF 6073.015.292 be repaired, or must it be replaced?
A: This electro-hydraulic unit is a sealed assembly. While minor debris can sometimes be cleaned from the solenoid screen, internal wear typically requires full replacement with the OEM genuine part to restore proper shift quality.
Q: How do I know if the EST 37 A is failing versus a clogged screen sheet?
A: A failing EST 37 A usually produces intermittent electrical faults (e.g., no response to shift commands), whereas a clogged SCREEN SHEET causes consistent low pressure across all gears. Use a multimeter to test solenoid resistance; if readings are out of spec, replace the 6073.015.292 unit.
Q: Is the 6073.015.292 compatible with the WG 180 transmission?
A: Yes, it is compatible with WG 180 models that use the same valve body casting. However, always verify that the HOUS.FRONT SECT matches your transmission’s bolt pattern before installation.
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