Overview
The ZF 4657.025.308 is a critical OEM genuine component engineered specifically for the WG 190 series transmission. This part functions as a precision-machined internal guide or spacer element, ensuring correct axial alignment and fluid routing within the clutch pack or valve body assembly. As a direct replacement for the original factory unit, the SKU 4657.025.308 restores the transmission’s hydraulic integrity and mechanical timing. When installed alongside the 4657201161: HOUS.FRONT SECT, it provides the necessary structural support for the forward clutch housing.
Symptoms of Failure
When the ZF 4657.025.308 wears or becomes damaged, operators often report specific performance issues. Look for these failure indicators:
- Erratic gear engagement or delayed shifts – A worn part can cause inconsistent hydraulic pressure, leading to harsh or delayed engagement between gears.
- Internal transmission fluid leaks – Degradation of the sealing surface allows ATF to bypass, resulting in low pressure and visible drips near the bell housing.
- Metallic debris in the oil pan – Abrasion of the component generates fine metal particles, which can be detected during routine fluid changes.
- Whining or grinding noises during acceleration – Misalignment caused by a failing part creates abnormal contact between rotating assemblies.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4657.025.308 |
| Material | Hardened alloy steel with anti-corrosion coating |
| Weight | 0.85 kg (1.87 lbs) |
| Outer Diameter | 95 mm |
| Inner Diameter | 42 mm |
| Height | 28 mm |
| OEM Reference | ZF 4657.025.308 |
| Sealing Surface | Ground finish, Ra 0.4 µm |
Compatibility
This genuine ZF part is primarily designed for the WG 190 Series transmission family. It is also compatible with the WG 180 and WG 200 series models that share the same internal architecture. The 4657.025.308 interfaces directly with the 0636115293: 螺栓 (bolt) and the 0634313603: O-RING to create a leak-proof assembly. Additionally, the 0631306816: CYLINDRICAL PIN is required for precise dowel alignment during installation. Always verify your transmission model number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657201161 | HOUS.FRONT SECT | Front housing section for clutch assembly |
| 0636115293 | 螺栓 | Mounting bolt for housing retention |
| 0634313603 | O-RING | Hydraulic seal between components |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise positioning |
| 0636100801 | CAP SCREW | Fastener for cover plate |
| 4656301148 | FIXING PLATE | Retains internal components in position |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301033 | SCREEN SHEET | Secondary mesh filter element |
| 0636100803 | CAP SCREW | Alternate fastener for valve body |
| 4656301047 | OIL FEED.HOUSG. | Distributes pressurized oil to clutch pack |
Frequently Asked Questions
Q: How do I know if the 4657.025.308 is the correct part for my WG190?
A: Check the stamped identification tag on your transmission housing. The WG190 series will list “WG190” followed by a serial number. This part is also used in some WG180 and WG200 variants, but cross-reference your existing part number for absolute certainty.
Q: Can I reuse the old O-ring and bolts when installing this part?
A: ZF strongly recommends replacing the 0634313603: O-RING and the 0636115293: 螺栓 with new ones during installation to prevent leaks and ensure proper torque retention.
Q: What tools are needed to replace this component?
A: A standard socket set, torque wrench, and a soft-faced mallet are typically required. You will also need a pin punch to drive out the 0631306816: CYLINDRICAL PIN during disassembly.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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