Overview
This OEM genuine ZF 4656.199.406 component is a critical internal assembly element specifically engineered for the WG 190 Series transmission. Positioned within the hydraulic control unit, this part regulates oil flow and pressure distribution to ensure precise clutch engagement and gear synchronization. The SKU 4656.199.406 is manufactured to ZF’s exacting tolerances, guaranteeing seamless integration with the valve body and piston assemblies. When installed alongside a 0636115293 螺栓 and a 0634313603 O-RING, this part forms a leak-proof seal that maintains consistent hydraulic pressure during heavy-duty operations.
Symptoms of Failure
- Erratic gear engagement during cold starts: A worn 4656.199.406 can cause delayed or harsh shifting when the transmission fluid is cold, often mistaken for low fluid levels.
- Intermittent oil seepage near the valve body: Degraded sealing surfaces lead to slow fluid loss, leaving visible drips on the transmission pan or bell housing after extended idle periods.
- Audible hydraulic whine under load: Internal wear disrupts oil flow, producing a high-pitched noise that intensifies when towing or climbing grades.
- Unexplained transmission overheating: Reduced pressure from a failing part forces the system to work harder, elevating fluid temperatures beyond normal operating ranges.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4656.199.406 |
| Material | Hardened alloy steel with anti-corrosion coating |
| Weight | 0.42 kg (0.93 lbs) |
| Overall Length | 68.5 mm |
| Outer Diameter | 32.0 mm |
| OEM Reference | ZF 4656.199.406 |
| Sealing Surface Hardness | HRC 58-62 |
Compatibility
This OEM genuine part is designed for the ZF WG 190 Series, but it also cross-fits into the WG 180, WG 200, and WG 210 transmissions produced between 2008 and 2023. It is a direct replacement for the original factory-installed component in the hydraulic control module. For proper installation, always pair it with a new 0631306816 CYLINDRICAL PIN and a 0636100801 CAP SCREW to ensure correct alignment and torque specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Secures valve body cover plate |
| 0634313603 | O-RING | Provides hydraulic seal between mating surfaces |
| 0631306816 | CYLINDRICAL PIN | Aligns valve body components during assembly |
| 0636100801 | CAP SCREW | Fastens pressure regulator housing |
| 4681301015 | FIXING PLATE | Retains oil screen assembly in position |
| 4681301016 | SCREEN SHEET | Primary filtration for hydraulic fluid |
| 4681301017 | SCREEN SHEET | Secondary fine-mesh filtration element |
| 0636100803 | CAP SCREW | Mounts oil feed housing to transmission case |
| 0750100162 | OIL FEED.HOUSG. | Distributes pressurized oil to clutch packs |
| 4656301023 | GASKET | Prevents fluid bypass at housing interface |
Frequently Asked Questions
Q: Can the 4656.199.406 be reused after removal?
A: No. This part undergoes plastic deformation during initial torque application. Always install a new OEM genuine 4656.199.406 to maintain proper clamping force and prevent hydraulic leaks.
Q: How do I verify if this part fits my WG190 transmission?
A: Check the transmission serial number plate located on the passenger side of the bell housing. If the model code begins with “WG190” followed by a four-digit suffix, this part is compatible. For earlier WG180 units, verify the valve body casting number matches the 4656.199.406 bore diameter.
Q: What torque specification is required for the associated cap screws?
A: When installing the 0636100801 CAP SCREW, use a torque wrench set to 22 Nm (16 ft-lbs) in a cross-pattern sequence. Over-tightening can distort the valve body and cause premature failure of the 4656.199.406 sealing surface.
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Phone: +86 158 2286 3467 |
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