Overview
The ZF 6073.015.200 EST 37 A for WG171 is a critical electronic control unit (ECU) or solenoid valve assembly designed to manage hydraulic pressure and shift timing within the transmission. Positioned directly on the valve body, this OEM genuine part interprets signals from the vehicle’s ECU to modulate clutch and brake engagement, ensuring smooth gear transitions under heavy load. The SKU 6073.015.200 is engineered to exact ZF tolerances, making it a direct replacement for worn units in the WG 171 Series. For optimal sealing and structural integrity, this assembly integrates with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to maintain oil circuit integrity.
Symptoms of Failure
When the ZF 6073.015.200 begins to degrade, operators often notice erratic shifting or delayed engagement when accelerating from a stop. A common symptom is harsh or jarring gear changes under moderate throttle, which can lead to driveline shock. Another frequent issue is intermittent loss of forward or reverse gears, particularly after the transmission reaches operating temperature. Additionally, internal hydraulic leaks may occur, causing low line pressure and eventual slipping during uphill climbs. If you observe these signs, inspect the SCREEN SHEET and the TUBE for debris that could accelerate wear on the EST 37 A.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 6073.015.200 |
| OEM Reference | ZF EST 37 A for WG171 |
| Material | Hardened aluminum alloy with steel solenoid core |
| Weight | 1.2 kg (2.65 lbs) |
| Dimensions (L x W x H) | 180 mm x 90 mm x 65 mm |
| Operating Pressure Range | 8–18 bar |
| Seal Type | Viton O-ring (compatible with 0634313514: O-RING) |
| Mounting Hardware | Requires 0636100803: CAP SCREW (x4) |
Compatibility
This genuine ZF part is specifically designed for the WG 171 Series transmission, but its valve body interface also fits select models in the WG180 and WG200 families when used with the correct adapter plate. It is not backward-compatible with older WG150 units without modifying the HOUSING REAR PART. For proper alignment during installation, always use a CYLINDRICAL PIN to secure the assembly. Additional fasteners such as 0636100801: CAP SCREW and 0636100160: CAP SCREW are required for full installation on WG180 and WG200 variants.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Encloses gear sets and oil sump |
| 4656301066 | HOUS.FRONT SECT | Front section supporting input shaft |
| 4656201015 | SCREEN SHEET | Filters hydraulic fluid contaminants |
| 4656301037 | TUBE | Routes oil between valve body and cooler |
| 0634313514 | O-RING | Seals hydraulic connections |
| 0636100803 | CAP SCREW | Secures valve body to housing |
| 4656301042 | HOUSING REAR PART | Rear casing for output shaft support |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for component mating |
| 0636100801 | CAP SCREW | Fastener for front housing section |
| 0636100160 | CAP SCREW | Fastener for rear housing section |
Frequently Asked Questions
Q: Can the ZF 6073.015.200 be repaired, or must it be replaced?
A: This is a sealed electro-hydraulic unit. Internal solenoid coils or valve spools cannot be serviced individually. Replacement with the OEM genuine part is the only reliable solution to restore shift quality.
Q: How do I know if my WG171 needs this part versus a different solenoid?
A: Diagnostic trouble codes (DTCs) related to “pressure control solenoid” or “shift solenoid A” often point to the EST 37 A. Physical inspection for oil contamination around the SCREEN SHEET can confirm debris-related failure.
Q: What torque specification should I use for the mounting cap screws?
A: Use 12 Nm (106 in-lbs) for the 0636100803: CAP SCREW and 8 Nm (71 in-lbs) for the 0636100160: CAP SCREW. Over-tightening can crack the valve body.
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