Overview
The ZF 6057.018.120 is a precision-engineered component designed specifically for the WG 160 Series transmission family. As an OEM genuine part, this unit serves as a critical interface element within the hydraulic control system, managing fluid distribution and pressure regulation during gear shifts. The SKU 6057.018.120 is machined from high-strength alloy steel to withstand the extreme thermal and mechanical loads present in heavy-duty commercial vehicle applications. This part is typically located in the valve body assembly, where it interacts directly with the TRANSMISSION HOUSING to ensure precise oil flow to clutches and brakes.
Symptoms of Failure
When the ZF 6057.018.120 begins to degrade, operators often notice specific performance issues. Delayed or harsh engagement between gears is a primary indicator, as worn sealing surfaces allow hydraulic pressure to bleed off. Intermittent gear slippage under load occurs when the part can no longer maintain consistent oil pressure, particularly during uphill climbs or heavy hauling. External oil seepage around the WG160 valve body area is another common failure symptom, often accompanied by a burnt transmission fluid smell. Finally, erratic shift patterns or unexpected neutral conditions may develop as the component fails to route fluid correctly to the HOUS.FRONT SECT and HOUSING REAR PART assemblies.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 6057.018.120 |
| Material | Case-hardened alloy steel (16MnCr5 equivalent) |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 142 mm |
| Outer Diameter | 38 mm |
| Surface Finish | Black oxide coated |
| OEM Reference | 6057.018.120 (ZF Friedrichshafen AG) |
| Torque Spec | 45 Nm (33 ft-lbs) when installed |
Compatibility
This genuine ZF part is engineered primarily for the WG 160 Series transmission, but cross-referencing with OEM catalogs confirms it also fits select variants of the WG 180 and WG 200 models produced after 2012. It is directly compatible with the HOUSING REAR SECTION in these transmissions. Always verify your transmission serial number against ZF application charts before ordering, as minor revisions exist between early and late production runs of the WG160.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101056 | TRANSMISSION HOUSING | Main structural casing for gear train and valve body |
| 4656201075 | HOUS.FRONT SECT | Forward section housing torque converter and pump |
| 4656201077 | HOUSING REAR PART | Rear casing supporting output shaft and PTO mount |
| 4656298049 | HOUSING REAR SECTION | Lower rear section for oil sump and filter housing |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 4656301148 | FIXING PLATE | Retention bracket for valve body components |
| 0636100817 | CAP SCREW | M10 fastener for securing housing sections |
| 4656301016 | SCREEN SHEET | Fine mesh filter for hydraulic oil circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh pre-filter for sump pickup |
| 0636100803 | CAP SCREW | M8 fastener for valve body cover plate |
Frequently Asked Questions
Q: How do I know if the 6057.018.120 needs replacement?
A: Monitor for progressive oil leakage from the WG160 valve body area or a gradual increase in shift time between 2nd and 3rd gear. A pressure test showing below 12 bar at idle confirms internal wear.
Q: Can this part be reused after a transmission rebuild?
A: ZF recommends always installing a new 6057.018.120 during major overhauls, as the hardened surface develops micro-cracks after 200,000 km that compromise sealing integrity.
Q: Is the 6057.018.120 interchangeable with the 6057.018.119?
A: No. The .120 revision includes an enlarged oil gallery bore (0.5 mm larger) that is not backward compatible with earlier WG160 valve bodies. Always match the exact suffix number.
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Phone: +86 158 2286 3467 |
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