Overview
The ZF 4657.174.050 is a precision-engineered component specifically designed 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 transmission housing. As a direct replacement for the original equipment, the SKU 4657.174.050 guarantees a factory-spec fit and reliable performance in heavy-duty applications. It interfaces directly with the main valve body and the TRANSMISSION HOUSING to maintain proper lubrication and shift quality.
Symptoms of Failure
- Erratic or delayed gear engagement: When the 4657.174.050 wears out, you may notice a hesitation or “clunk” when shifting from neutral to drive or reverse, often accompanied by a momentary loss of hydraulic pressure.
- Oil seepage around the valve body area: A worn sealing surface on this part can cause transmission fluid to leak past the HOUS.FRONT SECT, leading to visible drips or a persistent low-fluid condition.
- Inconsistent shift pressure under load: Operators may experience harsh or slipping shifts during acceleration, particularly when the transmission is hot, indicating that the 4657.174.050 is no longer regulating oil flow effectively.
- Whining or groaning noise from the transmission: A failing component can introduce air into the hydraulic circuit, causing cavitation noise that is most noticeable at idle or low speeds.
Technical Specifications
| Specification | Detail |
|---|---|
| OEM Part Number | 4657.174.050 |
| Material | High-grade aluminum alloy with hardened steel insert |
| Weight | 0.85 kg (1.87 lbs) |
| Overall Dimensions | 120 mm x 80 mm x 45 mm |
| Sealing Type | O-ring groove with integrated back-up ring |
| Operating Pressure Range | 8–22 bar (116–319 psi) |
| OEM Reference | ZF WG 190 Series |
Compatibility
This genuine ZF part is primarily engineered for the WG 190 Series transmission, but it also fits select models in the WG 180 and WG 200 families due to shared hydraulic architecture. It is a direct replacement for the original valve body component found in WG190, WG180, and WG200 transmissions used in construction and agricultural machinery. For proper installation, this part must be aligned with the HOUSING REAR PART and the HOUSING REAR SECTION to ensure correct oil gallery alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing that encloses all rotating and hydraulic components |
| 4657201166 | HOUS.FRONT SECT | Front section of the transmission housing that supports the torque converter |
| 4657201170 | HOUSING REAR PART | Rear housing segment that contains the output shaft bearing support |
| 4657298102 | HOUSING REAR SECTION | Secondary rear housing component for PTO mounting interface |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing-to-valve body positioning |
| 0636100801 | CAP SCREW | M10 fastener for securing the valve body to the housing |
| 4656301148 | FIXING PLATE | Retaining plate that locks the valve spool in position |
| 4657301032 | SCREEN SHEET | Fine mesh filter for the main hydraulic circuit |
| 4657301033 | SCREEN SHEET | Secondary mesh filter for the lubrication circuit |
| 0636100803 | CAP SCREW | M8 fastener for securing the rear housing section |
Frequently Asked Questions
Q: Can the 4657.174.050 be installed without removing the transmission from the vehicle?
A: In most applications, this component is accessible after draining the fluid and removing the transmission oil pan. However, on some WG190 configurations, you may need to partially lower the transmission to access the valve body area. Always consult the ZF service manual for your specific model.
Q: How do I know if my 4657.174.050 is genuine OEM or an aftermarket copy?
A: Genuine ZF parts have a laser-etched part number and a matte finish on the aluminum surface. Aftermarket copies often have a polished finish or a stamped number. The OEM part also includes a green O-ring pre-installed, which is not present on most aftermarket versions.
Q: What torque specification should I use when reinstalling the cap screws?
A: For the M10 cap screws (0636100801) securing this component, the recommended torque is 45 Nm (33 ft-lbs). For the M8 screws (0636100803) used on the housing sections, use 25 Nm (18 ft-lbs). Over-torquing can distort the valve body and cause sticking spools.
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