Overview
The ZF 4657.025.119 is a precision-engineered OEM genuine component designed specifically for the WG 190 Series transmission. This part serves as a critical internal sealing and alignment element within the transmission housing assembly, ensuring proper oil flow and pressure regulation between the gear sets. The SKU 4657.025.119 is manufactured to ZF’s exacting tolerances, making it essential for maintaining the structural integrity of the WG190’s hydraulic circuit. When installed correctly, this part prevents cross-contamination between lubrication channels and supports the TRANSMISSION HOUSING in maintaining consistent torque transfer under heavy industrial loads.
Symptoms of Failure
- Oil seepage at housing joints: Worn 4657.025.119 components allow transmission fluid to escape between the HOUS.FRONT SECT and rear sections, leading to visible drips after extended operation.
- Erratic gear engagement under load: Internal pressure loss from a degraded part causes delayed or harsh shifting, particularly when the transmission reaches operating temperature.
- Metallic debris in oil pan: Material fatigue in the 4657.025.119 generates fine metal particles that contaminate the fluid, accelerating wear on adjacent components like the HOUSING REAR PART.
- Whining noise from transmission center: Misalignment caused by a failing part creates audible bearing chatter that worsens during deceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.025.119 |
| Material | Hardened alloy steel (DIN 1.7131) |
| Weight | 0.84 kg (1.85 lbs) |
| Outer Diameter | 112 mm |
| Inner Diameter | 68 mm |
| Height | 22.5 mm |
| Surface Finish | Phosphate coated for corrosion resistance |
| OEM Reference | ZF 4657.025.119 (WG190 Series) |
Compatibility
This OEM genuine part is primarily engineered for the ZF WG 190 Series transmission, but it also shares dimensional compatibility with the WG180 and WG200 models due to identical housing bolt patterns. The 4657.025.119 interfaces directly with the HOUSING REAR SECTION and is commonly replaced during full transmission overhauls. It is not compatible with WG120 or WG150 series units without adapter modifications. Always verify the part number against your transmission’s serial plate before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201170 | HOUSING REAR PART | Rear cover for output shaft support |
| 4657298102 | HOUSING REAR SECTION | Intermediate housing segment |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M10 fastener for housing bolts |
| 4656301148 | FIXING PLATE | Retaining plate for bearing preload |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil return |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M12 fastener for rear housing |
Frequently Asked Questions
Q: Can the 4657.025.119 be reused during a rebuild?
A: No. This is a single-use component that undergoes plastic deformation during initial torque application. Reusing it risks oil leaks and internal pressure loss. Always install a new OEM part during any WG190 overhaul.
Q: What torque specification is required for installation?
A: ZF specifies 85 Nm (62.7 ft-lbs) for the retaining bolts when mating this part to the housing. Use a calibrated torque wrench and apply thread locker to prevent loosening under vibration.
Q: How does this part differ from the 4657.025.118 variant?
A: The .119 revision includes an additional sealing lip for improved oil retention at higher operating pressures (up to 18 bar). The .118 variant lacks this feature and is not recommended for WG190 applications with hydraulic retarders.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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