Overview
The ZF 4657.171.044 is a precision-engineered OEM genuine component specifically designed for the WG 190 Series transmission. This part functions as a critical hydraulic control element, regulating oil flow within the valve body to ensure smooth clutch engagement and gear shifts. As an integral part of the transmission’s hydraulic circuit, the 4657.171.044 works in concert with the TRANSMISSION HOUSING to maintain consistent pressure. The SKU 4657.171.044 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit for WG190 transmissions in heavy-duty commercial vehicles and industrial machinery.
Symptoms of Failure
When the ZF 4657.171.044 begins to wear, operators often notice delayed or harsh shifting between gears, particularly when the transmission is cold. A second common failure symptom is intermittent loss of forward or reverse drive, which may be accompanied by erratic hydraulic pressure readings. Third, internal leakage caused by a degraded 4657.171.044 can lead to transmission overheating and fluid contamination, often visible as dark or burnt-smelling oil on the dipstick. Finally, a failing unit may produce a whining or buzzing noise from the transmission sump during acceleration, indicating cavitation in the hydraulic circuit.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number / SKU | 4657.171.044 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Length | 142 mm |
| Width | 38 mm |
| Height | 28 mm |
| OEM Reference | ZF 4657.171.044 (Genuine) |
| Operating Pressure | 12–18 bar |
| Seal Type | Nitrile rubber O-ring (integrated) |
Compatibility
This OEM genuine part is primarily designed for the ZF WG 190 Series transmission, commonly found in municipal trucks, refuse vehicles, and construction equipment. It is also compatible with the WG 180 and WG 200 series transmissions, as these models share a common hydraulic valve body architecture. The 4657.171.044 can be used as a direct replacement in any WG190, WG180, or WG200 transmission built after 2012. For proper installation, ensure the HOUS.FRONT SECT and HOUSING REAR PART are clean and free of debris before assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear and shaft assembly |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft and pump |
| 4657201170 | HOUSING REAR PART | Rear casing section supporting output flange |
| 4657298102 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M10 fastener for securing valve body cover |
| 4656301148 | FIXING PLATE | Retainer plate for hydraulic control spool |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil return line |
| 4657301033 | SCREEN SHEET | Coarse mesh filter for suction line |
| 0636100803 | CAP SCREW | M8 fastener for screen sheet retention |
Frequently Asked Questions
Q: How do I know if the 4657.171.044 needs replacement?
A: Perform a pressure test on the WG190 transmission. If the control pressure drops below 10 bar during gear engagement, or if you observe metal particles in the oil filter, the 4657.171.044 is likely worn and should be replaced alongside the HOUSING REAR SECTION gasket.
Q: Can this part be installed without removing the transmission?
A: In most cases, yes. The 4657.171.044 is accessible after removing the transmission oil pan and valve body cover. However, you must also inspect the HOUS.FRONT SECT for scoring or wear during the procedure.
Q: Is the 4657.171.044 interchangeable with earlier WG series parts?
A: No. This SKU is specific to the WG190, WG180, and WG200 series with updated hydraulic circuits. Using it in older WG150 or WG120 transmissions will cause incorrect shift timing and potential damage to the HOUSING REAR PART.
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Phone: +86 158 2286 3467 |
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