Overview
The ZF 4681.302.006 is a critical OEM genuine component engineered for the WG190 and WG210 series transmissions. This part functions as a precision-machined guide or sealing element within the hydraulic control assembly, ensuring proper fluid routing and pressure regulation during gear shifts. The SKU 4681.302.006 is specifically designed to maintain the integrity of the valve body circuit, preventing cross-leakage between channels. When installed correctly with supporting hardware such as the 0636115293: 螺栓 and the 0634313603: O-RING, this part restores factory-spec clamping force and sealing performance.
Symptoms of Failure
- Delayed or harsh engagement: A worn 4681.302.006 causes inconsistent hydraulic pressure, leading to “ZF transmission shifting hard” or “WG190 slipping between gears” scenarios.
- Internal fluid contamination: Degradation of this component allows debris to bypass filters, resulting in “transmission fluid darkening quickly” or “metal particles in pan” complaints.
- Erratic pressure readings: Technicians often detect “low line pressure at idle” or “pressure fluctuations during acceleration” when this part loses its sealing capability.
- Audible whining or buzzing: A failing 4681.302.006 can produce “high-pitched noise from transmission” due to cavitation in the hydraulic circuit.
Technical Specifications
| OEM Part Number | 4681.302.006 |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | 0.18 kg (0.40 lbs) |
| Length | 42.5 mm |
| Outer Diameter | 18.0 mm |
| Surface Finish | Ground and polished (Ra ≤ 0.8 µm) |
| OEM Reference | ZF 4681.302.006 (Genuine) |
Compatibility
This genuine ZF part is directly compatible with the following transmission models: WG180, WG190, WG200, and WG210 series. It is also used in select WG150 and WG160 variants where the hydraulic control module shares the same valve body architecture. Always verify the part number 4681.302.006 against your transmission’s serial number. For complete assembly, pair this component with the 0631306816: CYLINDRICAL PIN for precise alignment and the 0636100801: CAP SCREW for secure fastening.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Secures valve body to transmission case |
| 0634313603 | O-RING | Provides hydraulic seal between mating surfaces |
| 0631306816 | CYLINDRICAL PIN | Aligns control bore components during assembly |
| 0636100801 | CAP SCREW | Fastens hydraulic cover plate |
| 4681301015 | FIXING PLATE | Retains internal screen assembly |
| 4681301016 | SCREEN SHEET | Filters coarse debris from hydraulic fluid |
| 4681301017 | SCREEN SHEET | Secondary filtration for fine particles |
| 0636100803 | CAP SCREW | M6 fastener for oil pan attachment |
| 0750100162 | OIL FEED.HOUSG. | Routes pressurized oil to clutch pack |
| 4656301023 | GASKET | Prevents external oil leakage at housing joint |
Frequently Asked Questions
Q: How do I know if the 4681.302.006 needs replacement?
A: If you observe “transmission fluid leaking from valve body area” or “erratic shift timing” after ruling out solenoid issues, inspect this part for scoring or deformation. A visual check for burrs on the sealing surface is recommended.
Q: Can I reuse the old O-ring or bolts when installing this part?
A: No. ZF recommends always replacing the 0634313603: O-RING and 0636115293: 螺栓 simultaneously to guarantee proper torque retention and sealing integrity.
Q: Is the 4681.302.006 compatible with aftermarket valve bodies?
A: This genuine ZF part is machined to OEM tolerances and fits only ZF-manufactured valve bodies. Aftermarket copies may require the 0631306816: CYLINDRICAL PIN for alignment correction, but we recommend using only OEM housings.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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