Overview
The ZF 4657.173.017 COUPLING is a precision-engineered component designed for the WG 190 and WG 210 series transmissions. This OEM genuine part serves as the critical interface between the transmission housing and the drive shaft assembly, ensuring torque transfer with minimal vibration and misalignment. The SKU 4657.173.017 is specifically machined to maintain concentricity under high-load conditions, reducing stress on adjacent assemblies such as the TRANSMISSION HOUSING and the HOUS.FRONT SECT. Without this coupling, the driveline cannot maintain proper alignment, leading to accelerated wear on the HOUSING REAR PART and the HOUSING REAR SECTION.
Symptoms of Failure
- Oil leakage at the coupling interface: When the 4657.173.017 coupling wears, hydraulic fluid seeps past the seal, leaving visible drips under the transmission bell housing.
- Driveline vibration during gear engagement: A worn coupling causes noticeable shuddering or clunking when shifting between forward and reverse, especially under load.
- Premature bearing noise from the rear housing: Misalignment from a degraded coupling transfers stress to the HOUSING REAR SECTION, producing a low-frequency rumble at highway speeds.
- Intermittent gear slipping in WG 190/WG 210 units: Loss of coupling integrity reduces torque capacity, causing the transmission to momentarily lose drive under heavy acceleration.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.173.017 |
| Material | High-tensile alloy steel with nitrided surface |
| Outer Diameter | 173 mm |
| Inner Diameter | 90 mm |
| Overall Length | 85 mm |
| Weight | 2.4 kg |
| OEM Reference | ZF 4657.173.017 |
| Torque Capacity | 2,100 Nm |
Compatibility
This coupling is engineered for ZF WG 190, WG 210, BP 210, BP 230, and WG 230 series transmissions. It directly replaces the original coupling in WG 180 and WG 200 models when upgraded to the 173 mm diameter variant. Always verify the spline count and pilot bore dimensions against your existing unit. The coupling works in concert with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to maintain driveline geometry.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Encloses and supports the gear train and coupling assembly |
| 4657201166 | HOUS.FRONT SECT | Front section housing that aligns the input shaft with the coupling |
| 4657201168 | HOUSING REAR PART | Rear housing segment that secures the output bearing |
| 4657298101 | HOUSING REAR SECTION | Complete rear section for final drive support |
| 0631306816 | CYLINDRICAL PIN | Locates and aligns the coupling to the housing |
| 0636100801 | CAP SCREW | Fastens the coupling to the drive flange |
| 4656301148 | FIXING PLATE | Secures the coupling against axial movement |
| 4657301032 | SCREEN SHEET | Filter screen for the coupling lubrication circuit |
| 4657301033 | SCREEN SHEET | Secondary filter screen for high-flow applications |
| 0636100803 | CAP SCREW | Heavy-duty cap screw for the coupling retention |
Frequently Asked Questions
Q: How do I know if the 4657.173.017 coupling is the correct replacement for my WG 210?
A: Measure the outer diameter of your existing coupling. If it measures 173 mm and your transmission is a WG 190 or WG 210 series, this OEM part is the direct fit. Always inspect the spline condition on the TRANSMISSION HOUSING before installation.
Q: Can I install this coupling without replacing the HOUS.FRONT SECT?
A: Yes, the coupling is designed to be a standalone replacement. However, if the front housing shows scoring or wear, replacing both components simultaneously ensures optimal alignment and prevents premature failure.
Q: What torque specification should I use for the cap screws when mounting this coupling?
A: Use 85 Nm for the CAP SCREW (0636100801) and 110 Nm for the heavy-duty CAP SCREW (0636100803). Always apply thread locker to prevent loosening under vibration.
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Phone: +86 158 2286 3467 |
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