Overview
This OEM genuine ZF 4657.025.132 is a critical internal component engineered specifically for the WG 190 Series transmission. It functions as a precision-machined guide or spacer element within the hydraulic control assembly, ensuring correct oil flow and clutch pack alignment during gear shifts. The SKU 4657.025.132 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty commercial and off-highway applications. When installed alongside a robust TRANSMISSION HOUSING, this part maintains the structural integrity required for sustained torque loads.
Symptoms of Failure
- Delayed or harsh engagement: A worn 4657.025.132 can cause erratic clutch pack timing, leading to “ZF transmission shifting hard” or “WG190 gear engagement delay.”
- Internal fluid leakage: Degraded sealing surfaces result in low line pressure, often described as “ZF transmission oil leaking from bell housing” or “WG190 transmission fluid loss.”
- Intermittent slipping under load: Operators may notice “transmission slipping in higher gears” or “WG190 losing power on inclines” as the part fails to maintain proper hydraulic circuit integrity.
- Unusual noise during operation: A failing component can produce a whining or grinding sound, commonly searched as “ZF WG190 transmission whine” or “gear train noise in ZF automatic.”
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4657.025.132 |
| Material | Hardened alloy steel with anti-corrosion coating |
| Weight | 0.85 kg (1.87 lbs) |
| Outer Diameter | 68.5 mm |
| Inner Diameter | 32.0 mm |
| Height | 45.2 mm |
| OEM Reference | ZF 4657.025.132 (Genuine) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF part is primarily designed for the WG 190 Series transmission family. It also shares dimensional compatibility with the WG 180 and WG 200 series in specific hydraulic control sections. When replacing this component, always verify the condition of adjacent assemblies such as the HOUS.FRONT SECT and the HOUSING REAR PART to prevent secondary failures. For complete rear-end rebuilds, the HOUSING REAR SECTION should be inspected simultaneously.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing for pump and converter |
| 4657201170 | HOUSING REAR PART | Rear housing segment for output shaft support |
| 4657298102 | HOUSING REAR SECTION | Complete rear section for planetary assembly |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M10 fastener for housing retention |
| 4656301148 | FIXING PLATE | Locking plate for clutch piston retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump return |
| 0636100803 | CAP SCREW | M12 fastener for rear housing assembly |
Frequently Asked Questions
Q: How do I know if the 4657.025.132 is the correct part for my WG190?
Verify your transmission’s serial number and consult the ZF parts catalog for the WG190 series. This part is used in the valve body or clutch feed circuit; if you see oil staining around the housing mating line, it is likely the source.
Q: Can I reuse the old sealing rings when installing this part?
No. Always replace all O-rings and gaskets when installing a new 4657.025.132. Reusing old seals will cause immediate fluid bypass and pressure loss.
Q: Is this part interchangeable with any aftermarket brands?
This is an OEM genuine ZF part. While some aftermarket copies exist, only the genuine 4657.025.132 guarantees the exact hardness and dimensional tolerances required for long service life in WG190 transmissions.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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