Overview
The ZF 4657.173.035 is a critical OEM genuine component engineered specifically for the WG 190 Series transmission. This part functions as a precision-machined internal guide or support element within the hydraulic control assembly, ensuring correct oil flow and pressure regulation during gear shifts. The SKU 4657.173.035 is manufactured to ZF’s exacting tolerances, making it essential for maintaining the durability and shift quality of heavy-duty WG190 transmissions. When installed alongside the 4657201132: HOUS.FRONT SECT, it forms a sealed front section that prevents contamination and stabilizes internal pressures.
Symptoms of Failure
- Erratic or delayed gear engagement: A worn 4657.173.035 can cause inconsistent hydraulic pressure, leading to hesitation when shifting from neutral to drive or reverse.
- Oil seepage around the front housing: Degradation of this component often results in visible transmission fluid leaks near the bell housing, a common long-tail search query for “ZF WG190 front seal leak.”
- Increased transmission noise during operation: As the part loses dimensional integrity, it may produce a whining or grinding sound under load, particularly in lower gears.
- Intermittent slipping under heavy torque: Failure to maintain proper oil channel alignment can cause the transmission to momentarily lose power during acceleration, especially in construction or off-road applications.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4657.173.035 |
| Material | High-strength alloy steel with corrosion-resistant coating |
| Weight | 0.85 kg (1.87 lbs) |
| Dimensions | 85 mm x 45 mm x 30 mm |
| OEM Reference | ZF 4657.173.035 (Genuine) |
| Surface Finish | Ground and polished to 0.8 Ra |
Compatibility
This OEM genuine part is primarily designed for the ZF WG 190 Series transmission, commonly found in medium-duty trucks, buses, and industrial equipment. It is also compatible with the closely related WG180 and WG200 models, as these share the same front housing architecture. For proper installation, always pair this component with the 0631306816: CYLINDRICAL PIN to ensure precise alignment, and secure it using the 0636100801: CAP SCREW. Additionally, the 4656301148: FIXING PLATE is required to lock the assembly in place during high-vibration operations.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657201132 | HOUS.FRONT SECT | Front housing section that encloses the hydraulic control unit |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise component positioning |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Locking plate to prevent fastener loosening |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil debris protection |
| 4657301033 | SCREEN SHEET | Secondary filter screen for hydraulic circuit |
| 0636100803 | CAP SCREW | Alternate-length cap screw for deeper housings |
| 0750301003 | OIL FEED.HOUSG. | Oil feed housing for lubricant distribution |
| 4656301023 | GASKET | Sealing gasket for oil-tight joints |
| 0736300182 | TORX SCREW | Torx-head screw for high-torque applications |
Frequently Asked Questions
Q: Can I use the 4657.173.035 in a ZF WG200 transmission?
A: Yes, this part is fully compatible with WG200 models, as the front housing and hydraulic guide dimensions are identical across the WG180, WG190, and WG200 series.
Q: What tools are required to replace this part?
A: Replacement typically requires a torque wrench, a set of Torx bits (including T30 and T40), and a soft-faced mallet. Always refer to the ZF service manual for exact torque specifications.
Q: How often should this component be inspected?
A: During major transmission overhauls, typically every 300,000 to 500,000 km (186,000 to 310,000 miles) in heavy-duty applications, or whenever symptoms of failure appear.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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