Overview
This genuine OEM part, the ZF 4657.374.021, is a critical internal component engineered specifically for the WG 190 Series transmission. It functions as a precision-machined guide and retention element within the hydraulic control assembly, ensuring correct alignment and pressure flow during gear shifts. The SKU 4657.374.021 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty off-highway and industrial drivelines. When installed, it works in concert with the 0631306792: CYLINDRICAL PIN to secure the valve body stack, while the 0636100801: CAP SCREW provides the necessary clamping force to maintain a leak-free seal.
Symptoms of Failure
When the 4657.374.021 component begins to degrade, operators typically notice three distinct failure modes. First, erratic shift timing occurs as internal fluid passages become obstructed or misaligned, leading to harsh engagement between gears. Second, visible oil seepage around the transmission housing bellows often appears, indicating that the sealing surfaces have worn beyond specification. Third, a persistent low-pressure warning on the dash display suggests the part is no longer maintaining proper hydraulic backpressure. If you are experiencing ZF transmission slipping under load or hard shifting in WG190 models, inspect this part immediately.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4657.374.021 |
| Material | Hardened alloy steel with anti-corrosion coating |
| Weight | 0.45 kg (1.0 lb) |
| Length | 72 mm |
| Outer Diameter | 28 mm |
| OEM Reference | ZF 4657.374.021 |
| Surface Finish | Ground and polished to Ra 0.8 |
Compatibility
This genuine ZF part is primarily designed for the WG 190 Series transmission, but it also fits select models in the WG180 and WG200 families due to shared hydraulic architecture. It is a direct replacement for units used in ZF WG190, WG180, and WG200 transmissions found in construction loaders, mining trucks, and agricultural tractors. Always verify your transmission serial number before ordering. For complete assembly integrity, pair this part with the 4656301148: FIXING PLATE and the 4657301032: SCREEN SHEET to ensure debris-free fluid flow and secure mounting.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631306792 | CYLINDRICAL PIN | Aligns and secures valve body components |
| 0636100801 | CAP SCREW | Fastens hydraulic housing with precise torque |
| 4656301148 | FIXING PLATE | Provides rigid support for internal assemblies |
| 4657301032 | SCREEN SHEET | Filters particulates from transmission fluid |
| 4657301033 | SCREEN SHEET | Secondary filtration for high-flow circuits |
| 0636100803 | CAP SCREW | Alternate thread-length fastener for deep housings |
| 0750301003 | OIL FEED.HOUSG. | Distributes pressurized oil to clutch packs |
| 4656301023 | GASKET | Seals mating surfaces to prevent fluid loss |
| 0736300182 | TORX SCREW | High-torque fastener for vibration-prone areas |
| 0736300233 | TORX SCREW | Extended-length variant for deep thread engagement |
Frequently Asked Questions
Q: Can I use the 4657.374.021 in a WG180 transmission?
A: Yes, this part is cross-compatible with WG180 and WG200 models that share the same valve body footprint. Always cross-reference your transmission tag number to confirm.
Q: What tools are needed to replace this part?
A: You will need a torque wrench, a set of hex keys, and a soft-faced mallet. It is recommended to replace the 4656301023: GASKET simultaneously to ensure a proper seal.
Q: How often should this component be inspected?
A: During every major transmission overhaul or at 3,000 operating hours, whichever comes first. Early replacement prevents secondary damage to the 0750301003: OIL FEED.HOUSG. and other hydraulic parts.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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