Overview
The ZF 4657.173.022 COUPLING is a critical OEM genuine component engineered for the WG 190 and WG 210 series transmissions. This precision-machined coupling serves as the primary torque transfer interface between the engine output and the transmission input shaft, ensuring smooth power delivery and driveline alignment. As an original equipment part, SKU 4657.173.022 guarantees exact fitment and metallurgical integrity, reducing the risk of premature wear in high-torque applications. It is housed within the main transmission casing, working in concert with the TRANSMISSION HOUSING and the HOUS.FRONT SECT to maintain structural rigidity and rotational accuracy.
Symptoms of Failure
- Torque converter shudder at low RPM: A worn 4657.173.022 coupling can cause vibration or shuddering during initial acceleration, often misdiagnosed as a fluid issue.
- Transmission oil leaks near the bell housing: Deterioration of the coupling seal surface leads to fluid seepage, visible as drips from the joint between the engine and transmission.
- Intermittent gear slipping under load: When the coupling loses its dimensional tolerance, it fails to maintain proper engagement, resulting in momentary power loss during uphill climbs or heavy hauling.
- Metallic grinding noise during gear changes: Advanced wear produces a distinct grinding sound as the coupling contacts the HOUSING REAR PART due to misalignment.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.173.022 |
| Outer Diameter | 195 mm |
| Inner Diameter | 85 mm |
| Thickness | 32 mm |
| Material | Hardened alloy steel (42CrMo4) |
| Weight | 2.85 kg |
| OEM Reference | ZF 4657.173.022 |
| Fastener Torque | 120 Nm (with CAP SCREW 0636100801) |
Compatibility
This coupling is specifically designed for ZF WG 190 and WG 210 series transmissions. It is also compatible with the WG 180 and WG 200 models when used with the appropriate CYLINDRICAL PIN for alignment. The part integrates directly with the TRANSMISSION HOUSING assembly and requires the HOUS.FRONT SECT for proper installation. Always verify your transmission serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201027 | HOUS.FRONT SECT | Front section housing the input shaft |
| 4657201012 | HOUSING REAR PART | Rear section supporting output bearings |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636100801 | CAP SCREW | M12 fastener for coupling retention |
| 4656301148 | FIXING PLATE | Locking plate for coupling bolts |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M10 fastener for housing sections |
| 4681301040 | OIL FEED.HOUSG. | Lubrication channel housing |
Frequently Asked Questions
Q: Can the 4657.173.022 coupling be used in a WG 200 transmission?
A: Yes, it is compatible with WG 200 models, but you must also replace the CYLINDRICAL PIN to ensure correct alignment with the HOUSING REAR PART.
Q: What torque specification should I use for the cap screws?
A: Use 120 Nm for the CAP SCREW 0636100801. Always apply thread locker and replace the FIXING PLATE to prevent loosening.
Q: How do I identify a genuine ZF 4657.173.022 coupling?
A: Genuine parts have a laser-etched ZF logo and part number on the outer diameter. Counterfeits often lack the precise hardness of the alloy steel.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
