Overview
This OEM genuine ZF 4657.025.117 is a critical hydraulic control component specifically engineered for the WG 190 Series transmission. Positioned within the valve body assembly, this part regulates oil flow and pressure to ensure precise gear engagement and smooth shifting under heavy-duty loads. The SKU 4657.025.117 interfaces directly with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to maintain consistent hydraulic circuit integrity. As a genuine ZF part, it guarantees factory-specified tolerances and material composition for extended service life in commercial vehicle applications.
Symptoms of Failure
- Erratic shifting or delayed engagement: When the 4657.025.117 wears, internal spools may stick, causing harsh or unpredictable gear changes during acceleration.
- Transmission fluid leaks near the valve body: Degraded seals on this part often lead to visible oil seepage around the HOUSING REAR PART junction.
- Loss of line pressure under load: A failing unit can cause insufficient hydraulic pressure, resulting in clutch slip or inability to hold gears on inclines.
- Unusual whining or buzzing noises: Cavitation from restricted oil passages in this component produces audible high-frequency sounds during operation.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.025.117 |
| Material | Hardened aluminum alloy with steel spool |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 145 mm x 72 mm x 48 mm |
| Operating Pressure Range | 8–22 bar (116–319 psi) |
| OEM Reference | ZF WG 190 Series |
Compatibility
This genuine ZF 4657.025.117 is designed primarily for the WG 190 Series transmission family. It is also compatible with the WG 180 and WG 200 series models that share the same valve body architecture. The part integrates seamlessly with the HOUSING REAR SECTION and requires no modification for installation in these units. Always verify your transmission serial number against ZF’s official compatibility charts before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing torque converter |
| 4657201170 | HOUSING REAR PART | Rear cover for output shaft area |
| 4657298102 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636100801 | CAP SCREW | M10 fastener for valve body retention |
| 4656301148 | FIXING PLATE | Locking plate for shift rail positioning |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil intake |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for debris |
| 0636100803 | CAP SCREW | M8 fastener for housing cover |
Frequently Asked Questions
Q: Can the 4657.025.117 be repaired instead of replaced?
A: While minor debris can be cleaned, internal wear on the spool and bore surfaces typically requires full replacement to restore proper hydraulic function. Reusing a worn unit risks cascading damage to the valve body.
Q: What tools are needed to install this part?
A: Standard metric socket set (10mm, 13mm), torque wrench (8–12 Nm for cap screws), and a seal pick for O-ring removal. Always replace the CAP SCREW and CYLINDRICAL PIN during reassembly.
Q: How does this part affect transmission cooling?
A: It controls the flow path to the cooler circuit. A failing unit can restrict oil return, causing overheating. Pair with a new SCREEN SHEET to ensure debris-free operation.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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