Overview
The ZF 4657.374.020 is a precision-engineered component designed specifically for the WG 190 series transmission. This OEM genuine part plays a critical role in the hydraulic control circuit, ensuring consistent oil flow and pressure regulation within the valve body assembly. The SKU 4657.374.020 is manufactured to ZF’s exacting tolerances, providing reliable performance in heavy-duty commercial vehicles and off-highway equipment. When installed correctly, this part maintains the integrity of the transmission’s lubrication and cooling system, preventing premature wear on clutches and bearings.
Symptoms of Failure
When the ZF 4657.374.020 begins to fail, operators may notice erratic gear engagement or delayed shifting, particularly under load. Another common symptom is low transmission oil pressure accompanied by warning lights on the dashboard. You might also observe oil seepage around the valve body area, which can lead to fluid contamination. In advanced cases, intermittent slipping in higher gears occurs as the hydraulic circuit loses its ability to maintain proper clamping force on clutch packs.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.374.020 |
| Material | Hardened steel with corrosion-resistant coating |
| Length | 48.5 mm |
| Outer Diameter | 22.3 mm |
| Weight | 0.085 kg |
| OEM Reference | ZF 4657.374.020 |
| Thread Pitch | M12 x 1.5 |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This genuine ZF part is primarily used in the WG 190 series transmission, but it also fits select models in the WG 180 and WG 200 families. It is commonly found in ZF 6WG200, ZF 5WG180, and ZF 4WG190 applications used in municipal trucks, fire apparatus, and construction loaders. Always verify your transmission’s serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631306792 | Cylindrical Pin | Aligns and secures valve body components |
| 0636100801 | Cap Screw | Fastens the valve body to the transmission housing |
| 4656301148 | Fixing Plate | Retains the screen sheet in position |
| 4657301032 | Screen Sheet | Filters debris from hydraulic oil |
| 4657301033 | Screen Sheet | Alternative fine-mesh filter element |
| 0636100803 | Cap Screw | M10 bolt for auxiliary mounting points |
| 0750301003 | Oil Feed Housing | Distributes pressurized oil to clutch packs |
| 4656301023 | Gasket | Seals the oil feed housing interface |
| 0736300182 | Torx Screw | M8 Torx fastener for valve body covers |
| 0736300233 | Torx Screw | M6 Torx fastener for sensor brackets |
Frequently Asked Questions
Q: Can I use the 4657.374.020 in a ZF WG180 transmission?
A: Yes, this part is cross-compatible with WG180 series transmissions that share the same valve body design. Always check the part number on your existing component before ordering.
Q: What tools are required to replace this part?
A: You will need a torque wrench, a set of hex keys, and a clean workspace. It is recommended to replace the Gasket (4656301023) and Cap Screw (0636100801) at the same time to ensure a leak-free installation.
Q: How often should the screen sheet be replaced?
A: ZF recommends inspecting the Screen Sheet (4657301032) every 500 operating hours or during major transmission overhauls. Replace it immediately if you notice metal debris or clogging.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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