Overview
The ZF 4657.025.134 is a precision-engineered internal component specifically designed for the WG 190 Series transmission. This OEM genuine part plays a critical role in maintaining hydraulic pressure integrity and ensuring smooth gear engagement within the transmission’s valve body assembly. As a high-wear item, the SKU 4657.025.134 directly influences shift quality and overall drivetrain reliability. When paired with the robust TRANSMISSION HOUSING and the HOUS.FRONT SECT, this part ensures proper sealing and alignment under extreme torque loads.
Symptoms of Failure
- Erratic shifting or gear slippage: A worn 4657.025.134 can cause inconsistent hydraulic pressure, leading to delayed or harsh shifts between gears.
- Transmission fluid leaks near the valve body: Deterioration of this sealing element often results in visible oil seepage around the mid-section of the transmission.
- Loss of torque converter lockup: When this part fails, you may notice increased engine RPM without corresponding vehicle speed, particularly during highway driving.
- Intermittent neutral drops: A sudden loss of drive engagement, especially when the transmission is hot, frequently points to failure of this specific OEM component.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4657.025.134 |
| Material | High-grade hardened steel with nitrile coating |
| Weight | 0.45 kg (1.0 lb) |
| Dimensions (L x W x H) | 85 mm x 42 mm x 28 mm |
| Operating Temperature Range | -40°C to +150°C |
| OEM Reference | ZF 4657.025.134 (Genuine) |
| Thread Pitch | M8 x 1.25 (mounting points) |
Compatibility
This genuine ZF part is primarily engineered for the WG 190 Series transmission family. It is also compatible with the following ZF models that share the same valve body architecture: WG 180, WG 200, and WG 210. For optimal performance, always replace this component alongside the HOUSING REAR PART and the HOUSING REAR SECTION to prevent premature wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft support |
| 4657201170 | HOUSING REAR PART | Rear housing segment for output bearing retention |
| 4657298102 | HOUSING REAR SECTION | Extended rear section for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M10 fastener for housing bolt torque |
| 4656301148 | FIXING PLATE | Retention bracket for valve body assembly |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic fluid |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump return |
| 0636100803 | CAP SCREW | M12 fastener for rear housing attachment |
Frequently Asked Questions
Q: Can I install the 4657.025.134 without replacing the housing gaskets?
A: It is strongly recommended to replace all sealing surfaces, including the HOUSING REAR PART gasket, when servicing this component to prevent future fluid leaks.
Q: How do I verify if this part is genuine OEM?
A: Check for the laser-etched ZF logo and part number 4657.025.134 on the component body. Counterfeit parts often lack the precise thread tolerances required for WG190 assemblies.
Q: What torque specification applies to the mounting bolts for this part?
A: Use 25 Nm (18.4 lb-ft) for the M8 bolts securing this component. Always reference the ZF service manual for your specific transmission model.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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