Overview
The ZF 4657.173.018 COUPLING is a critical torque-transfer component engineered specifically for the WG 190 and WG 210 series transmissions. This OEM genuine part sits between the engine flywheel and the transmission input shaft, acting as a flexible connector that dampens torsional vibrations while ensuring precise power delivery. The SKU 4657.173.018 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit and long service life in heavy-duty industrial applications. When installed alongside the 4657101039: TRANSMISSION HOUSING, this coupling maintains proper alignment and load distribution across the driveline.
Symptoms of Failure
- Transmission gear slipping under load – A worn 4657.173.018 coupling can cause intermittent power loss, especially during acceleration or when climbing grades, as the coupling loses its ability to maintain positive engagement.
- Metallic rattling or clunking noises from the bell housing – Excessive clearance in the coupling produces audible knocking sounds at idle or during gear changes, indicating the rubber or composite elements have degraded.
- Visible oil seepage near the flywheel housing – When the coupling’s sealing surface deteriorates, transmission fluid can leak past the joint, leaving wet spots on the 4657201028: HOUS.FRONT SECT.
- Increased driveline vibration at highway speeds – A failing coupling cannot properly dampen harmonics, causing noticeable shuddering through the chassis and steering wheel.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4657.173.018 |
| Outer Diameter | 210 mm (estimated) |
| Inner Diameter | 75 mm (estimated) |
| Thickness | 45 mm (estimated) |
| Material | High-tensile steel hub with elastomeric damping insert |
| Weight | 3.2 kg (estimated) |
| OEM Reference | ZF 4657.173.018 (Genuine) |
| Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This coupling is designed for the ZF WG 190 and WG 210 series transmissions, commonly found in municipal buses, fire trucks, and medium-duty construction vehicles. It is also compatible with the WG 180 and WG 200 models when used with the correct 4657201013: HOUSING REAR PART. For proper installation, ensure the 0631306792: CYLINDRICAL PIN is aligned correctly to prevent misalignment during reassembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Encloses and supports all internal gear components |
| 4657201028 | HOUS.FRONT SECT | Front section of the transmission housing, mates to bell housing |
| 4657201013 | HOUSING REAR PART | Rear section of the transmission housing, supports output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for precise housing assembly |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Locks coupling in position on the input shaft |
| 4657301034 | SCREEN SHEET | Fine mesh filter for transmission oil circuit |
| 4657301035 | SCREEN SHEET | Coarse mesh filter for transmission oil circuit |
| 0636100803 | CAP SCREW | Fastener for coupling retaining plate |
| 4681301040 | OIL FEED.HOUSG. | Distributes pressurized oil to clutch and bearings |
Frequently Asked Questions
Q: How do I know if the 4657.173.018 coupling needs replacement?
A: Inspect for radial play by prying gently on the coupling hub. If movement exceeds 2 mm, or if you see cracked rubber segments, replace immediately to avoid damage to the TRANSMISSION HOUSING.
Q: Can this coupling be reused after a transmission overhaul?
A: ZF recommends always installing a new 4657.173.018 coupling during rebuilds. The elastomeric element degrades over time and cannot be reliably re-tensioned.
Q: Does this part require special tools for installation?
A: Yes, a coupling puller and torque wrench are necessary. Always replace the CYLINDRICAL PIN and CAP SCREW to ensure proper clamping force.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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