Overview
This OEM genuine ZF 4657.373.009 component is a critical internal assembly part designed specifically for the WG 190 series transmission. Positioned within the hydraulic control unit, it regulates fluid flow and pressure modulation during gear shifts. The SKU 4657.373.009 ensures precise engagement and disengagement of clutches, directly influencing shift quality and torque delivery. As a factory-original ZF part, it meets exacting tolerances for durability in heavy-duty industrial applications. When installed alongside a 0631306792 CYLINDRICAL PIN and 0636100801 CAP SCREW, this part maintains the structural integrity of the valve body assembly.
Symptoms of Failure
- Erratic shift timing or delayed engagement — Worn internal bores cause inconsistent hydraulic pressure, leading to harsh or slipping shifts during acceleration.
- Transmission fluid contamination — Degraded sealing surfaces allow debris to bypass filtration, often requiring replacement of the 4657301032 SCREEN SHEET simultaneously.
- Audible whining or grinding from the valve body area — Metal-on-metal contact from a loose 4656301148 FIXING PLATE can accelerate wear on this part.
- Intermittent loss of forward or reverse gears — Internal leakage past the 4657.373.009 reduces clutch pack holding capacity under load.
Technical Specifications
| Part Number | 4657.373.009 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions (L x W x H) | 95 mm x 42 mm x 28 mm |
| OEM Reference | ZF 4657.373.009 |
| Operating Temperature Range | -40°C to +120°C |
| Sealing Type | Integrated O-ring groove (O-ring sold separately) |
Compatibility
This genuine ZF 4657.373.009 is engineered for the WG 190 series transmission family. It is also compatible with WG 180, WG 200, and select WG 210 variants that share the same valve body architecture. Always verify your transmission model number before installation. For complete rebuilds, pair this part with a 4657301033 SCREEN SHEET and 0636100803 CAP SCREW to ensure proper filtration and fastening.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0631306792 | CYLINDRICAL PIN | Aligns and secures valve body components |
| 0636100801 | CAP SCREW | Fastens housing and cover plates |
| 4656301148 | FIXING PLATE | Retains internal shift rails and springs |
| 4657301032 | SCREEN SHEET | Primary filtration for hydraulic fluid |
| 4657301033 | SCREEN SHEET | Secondary fine-mesh filtration element |
| 0636100803 | CAP SCREW | M6 x 20 mm fastener for valve body |
| 0750301003 | OIL FEED.HOUSG. | Distributes pressurized oil to clutch packs |
| 4656301023 | GASKET | Seals mating surfaces to prevent leaks |
| 0736300182 | TORX SCREW | High-torque fastener for valve body covers |
| 0736300233 | TORX SCREW | M8 x 25 mm screw for housing retention |
Frequently Asked Questions
Q: Can the 4657.373.009 be reused after a transmission overhaul?
A: ZF recommends replacing this part during any major rebuild due to potential wear on sealing surfaces. Reusing it may compromise hydraulic pressure integrity.
Q: What tools are required to install this part?
A: Standard metric hex keys and a torque wrench are needed. Ensure the 0636100801 CAP SCREW is torqued to 18 Nm to avoid distortion.
Q: How does this part interact with the SCREEN SHEET components?
A: The 4657.373.009 sits downstream of the 4657301032 SCREEN SHEET; if the screen is clogged, debris can score this part’s bore, leading to internal leakage.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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