Overview
The ZF 6057.018.545 EST 37 A for WG171 is a critical electronic solenoid control unit that modulates hydraulic pressure within the transmission’s valve body. This OEM genuine part, identified by SKU 6057.018.545, precisely governs clutch engagement and shift timing in the WG 171 series. It interfaces directly with the main TRANSMISSION HOUSING and the HOUS.FRONT SECT to ensure seamless power delivery under heavy loads.
Symptoms of Failure
- Erratic or delayed gear engagement: When the EST 37 A fails, you may notice a pronounced lag when shifting from neutral to drive or reverse, especially during cold starts.
- Intermittent transmission slipping: Worn solenoids cause inconsistent hydraulic pressure, leading to sudden RPM flares without corresponding acceleration—a classic sign of internal wear.
- Harsh or jarring shifts: A failing unit can cause abrupt upshifts or downshifts, often accompanied by a metallic clunk from the driveline.
- Transmission fluid contamination: Debris from a degraded solenoid can migrate through the system, clogging the SCREEN SHEET and reducing overall lubrication efficiency.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 6057.018.545 |
| OEM Reference | ZF EST 37 A |
| Material | High-grade aluminum alloy with corrosion-resistant coating |
| Weight | 1.2 kg (2.65 lbs) |
| Dimensions (L x W x H) | 180 mm x 95 mm x 65 mm |
| Operating Voltage | 12V / 24V DC |
| Seal Type | Integrated O-ring (compatible with 0634313514: O-RING) |
| Mounting Hardware | Requires 0636100803: CAP SCREW (x4) |
Compatibility
This EST 37 A solenoid is engineered specifically for the ZF WG 171 series, but it also cross-fits select models in the WG180 and WG200 families due to shared valve body architecture. It is commonly used in off-highway trucks, wheel loaders, and agricultural tractors. For proper installation, ensure the TUBE and rear section components like 4656301042: HOUSING REAR PART are free of debris. Always replace the 0631306816: CYLINDRICAL PIN and cap screws (0636100801: CAP SCREW and 0636100160: CAP SCREW) during reassembly to prevent fluid leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Main structural casing that encloses gear sets and valve body |
| 4656301066 | HOUS.FRONT SECT | Front section housing that supports input shaft and pump |
| 4656201015 | SCREEN SHEET | Fine mesh filter that protects solenoids from particulate contamination |
| 4656301037 | TUBE | Hydraulic fluid passage connecting valve body to cooler lines |
| 0634313514 | O-RING | Seals solenoid-to-housing interface to prevent external leaks |
| 0636100803 | CAP SCREW | M8 fastener for securing solenoid bracket |
| 4656301042 | HOUSING REAR PART | Rear casing section that houses output shaft and PTO gear |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise valve body positioning |
| 0636100801 | CAP SCREW | M10 fastener for transmission housing assembly |
| 0636100160 | CAP SCREW | M12 fastener for rear housing attachment |
Frequently Asked Questions
Q: Can the 6057.018.545 be repaired, or must it be replaced?
A: This is a sealed electronic unit; internal coil windings and valve spools are not serviceable. Replacement with an OEM genuine part is the only reliable solution to restore proper shift quality.
Q: How do I verify compatibility with my WG171 transmission?
A: Check the serial number plate on your transmission housing. The EST 37 A is standard on WG171 units built after 2015. If your unit has a mechanical governor, you will need the corresponding adapter kit.
Q: What torque specification should I use for the mounting cap screws?
A: For the 0636100803: CAP SCREW, apply 25 Nm (18.4 ft-lb). Over-tightening can crack the solenoid housing and cause internal short circuits.
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