Overview
This OEM genuine ZF 4657.201.019 component is a critical internal control element engineered specifically for the WG 190 Series transmission family. Positioned within the hydraulic control unit, this part regulates fluid pressure distribution to ensure precise clutch and brake application during gear shifts. The SKU 4657.201.019 is manufactured to ZF’s original tolerances, guaranteeing seamless integration with your transmission’s valve body assembly. When installed alongside the 0631306792: CYLINDRICAL PIN and the 0636100801: CAP SCREW, this part forms a sealed, high-pressure circuit essential for consistent shift quality.
Symptoms of Failure
- Erratic gear engagement under load: A worn 4657.201.019 can cause delayed or harsh shifts, particularly when climbing grades or towing heavy loads.
- Internal hydraulic pressure loss: Degraded sealing surfaces lead to fluid bypass, resulting in “transmission slipping at highway speed” complaints from operators.
- Contaminated oil circulation: If the 4657301032: SCREEN SHEET is compromised, debris can accelerate wear on this part, causing intermittent neutral conditions.
- Visible oil seepage near valve body: Cracks or deformation in the housing create external leaks, often mistaken for pan gasket failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.201.019 |
| Material | Hardened steel with corrosion-resistant coating |
| Weight | 0.45 kg (1.0 lb) |
| Length | 82 mm |
| Width | 38 mm |
| Height | 22 mm |
| OEM Reference | ZF 4657.201.019 |
| Operating Pressure | Up to 18 bar (261 psi) |
| Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF part is designed for the WG 190 Series but also fits select models in the WG180 and WG200 families. It is commonly used in ZF WG190, WG180, and WG200 transmissions found in medium-duty trucks, buses, and off-highway equipment. Always verify your transmission’s serial number before ordering. For proper installation, pair this part with the 4656301148: FIXING PLATE to secure the assembly against vibration-induced loosening.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631306792 | CYLINDRICAL PIN | Aligns and secures valve body components |
| 0636100801 | CAP SCREW | Fastens hydraulic control unit to housing |
| 4656301148 | FIXING PLATE | Prevents axial movement of internal pistons |
| 4657301032 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4657301033 | SCREEN SHEET | Alternative fine-mesh filter for high-contaminant environments |
| 0636100803 | CAP SCREW | Longer fastener for multi-plate clutch packs |
| 0750301003 | OIL FEED.HOUSG. | Distributes pressurized oil to rotating assemblies |
| 4656301023 | GASKET | Seals mating surfaces to prevent fluid leaks |
| 0736300182 | TORX SCREW | High-torque fastener for valve body retention |
| 0736300233 | TORX SCREW | Corrosion-resistant screw for external mounting points |
Frequently Asked Questions
Q: How do I know if my ZF WG190 needs the 4657.201.019 replaced?
A: If you experience delayed reverse engagement or a “flare” between gears during upshifts, this part is likely worn. Always inspect the 4657301032: SCREEN SHEET simultaneously for debris contamination.
Q: Can I reuse the old fixing plate when installing this part?
A: No. ZF recommends always installing a new 4656301148: FIXING PLATE to guarantee proper clamping force and prevent fastener loosening under thermal cycling.
Q: Is this part interchangeable between WG180 and WG200 transmissions?
A: While the 4657.201.019 shares the same mounting pattern across WG180, WG190, and WG200 models, always cross-reference your transmission’s valve body casting number to confirm compatibility.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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