Overview
The ZF 6073.015.406 EST 37 A is an OEM genuine control unit specifically engineered for the WG 171 series transmission. This electronic shift module governs clutch engagement and gear selection logic, ensuring precise hydraulic actuation within the transmission housing. As a critical component of the shift control system, the SKU 6073.015.406 interfaces directly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to regulate oil flow paths. Without this part, the transmission cannot execute commanded shifts, making it indispensable for maintaining driveline performance in heavy-duty industrial applications.
Symptoms of Failure
When the ZF 6073.015.406 EST 37 A begins to degrade, operators often notice erratic shift timing or delayed engagement when moving from neutral to drive. A second common failure symptom is intermittent gear slipping under load, particularly during uphill hauling or when towing heavy equipment. Third, a worn unit may cause the transmission to default to a limp-home mode, locking the vehicle in a single gear. Finally, internal electrical faults can produce intermittent “check transmission” warnings on the dashboard, even when fluid levels are correct. These issues directly impact operational uptime and should be addressed immediately.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 6073.015.406 |
| Designation | EST 37 A |
| Material | Die-cast aluminum with sealed electronics |
| Weight | 1.8 kg (approx.) |
| OEM Reference | ZF WG 171 Series |
| Operating Voltage | 24V DC |
| Seal Type | Integrated O-ring (use 0634313514: O-RING) |
| Mounting Hardware | 0636100803: CAP SCREW (4x required) |
Compatibility
This genuine ZF part is designed primarily for the WG 171 transmission series. However, due to shared electronic architecture, it also functions in the WG 180 and WG 200 series when used with the correct TUBE and SCREEN SHEET assemblies. Always verify the housing variant before installation, as the HOUSING REAR PART configuration may differ between models. The EST 37 A is not backward-compatible with older WG 120 or WG 150 units without significant adapter modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4656301066 | HOUS.FRONT SECT | Front section enclosing the torque converter |
| 4656201015 | SCREEN SHEET | Filter mesh protecting valve body passages |
| 4656301037 | TUBE | Oil delivery conduit between pump and clutch packs |
| 0634313514 | O-RING | Seals the EST 37 A to the housing |
| 0636100803 | CAP SCREW | Fastens the control unit to the housing |
| 4656301042 | HOUSING REAR PART | Rear casing supporting output shaft bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise component positioning |
| 0636100801 | CAP SCREW | Secures the front housing section |
| 0636100160 | CAP SCREW | Mounts the rear housing to the main case |
Frequently Asked Questions
Q: Can the ZF 6073.015.406 be repaired, or must it be replaced?
A: This unit is a sealed electronic assembly. Internal failures typically require full replacement rather than repair. Always inspect the mating HOUS.FRONT SECT for damage before installing a new EST 37 A.
Q: What torque specification should I use for the mounting cap screws?
A: Use 12 Nm for the 0636100803: CAP SCREW fasteners. Over-torquing can crack the housing or distort the seal surface.
Q: Will this part work with a WG 180 transmission?
A: Yes, but you must also replace the SCREEN SHEET and verify the TUBE length matches the WG 180 oil circuit layout.
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