Overview
The ZF 4657.173.028 COUPLING is a critical torque-transfer component engineered specifically for the WG 190 and WG 210 series transmissions. This OEM genuine part serves as the mechanical link between the engine output and the transmission input shaft, ensuring smooth power delivery and dampening torsional vibrations. The SKU 4657.173.028 sits directly within the driveline assembly, where it interfaces with the 4657101082: TRANSMISSION HOUSING to maintain precise alignment and load distribution. Without this coupling, the transmission cannot engage properly, making it a non-negotiable component for operational integrity.
Symptoms of Failure
When the ZF 4657.173.028 coupling begins to degrade, operators will notice distinct performance issues. Transmission shudder during low-speed maneuvers is a primary indicator, often mistaken for torque converter problems. Metallic clunking sounds when shifting between forward and reverse signal excessive wear in the coupling splines. Vibration at highway speeds that intensifies under load points to imbalance or material fatigue. Finally, intermittent loss of power transfer during acceleration suggests the coupling is slipping or has developed cracks. These symptoms typically worsen if the coupling is not replaced promptly.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4657.173.028 |
| Material | High-tensile alloy steel with nitrided surface |
| Outer Diameter | 185 mm |
| Inner Diameter | 65 mm |
| Overall Length | 142 mm |
| Weight | 4.8 kg |
| OEM Reference | ZF 4657.173.028 |
| Torque Capacity | 2,100 Nm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This coupling is precision-machined for the ZF WG 190 and WG 210 transmission families. It is also compatible with the WG 180 series when used with the 4657201166: HOUS.FRONT SECT adapter. For WG 200 variants, installation requires the 4657201170: HOUSING REAR PART to maintain proper clearance. The 4657298102: HOUSING REAR SECTION is also used in certain WG 210 configurations. Always verify your transmission model code before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201166 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201170 | HOUSING REAR PART | Rear housing section for output support |
| 4657298102 | HOUSING REAR SECTION | Alternate rear housing for WG 210 |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing mating |
| 0636100801 | CAP SCREW | Fastener for coupling retention |
| 4656301148 | FIXING PLATE | Locking plate for coupling bolts |
| 4657301032 | SCREEN SHEET | Filter screen for oil return |
| 4657301033 | SCREEN SHEET | Secondary filter screen |
| 0636100803 | CAP SCREW | Mounting bolt for housing sections |
Frequently Asked Questions
Q: Can the 4657.173.028 coupling be repaired, or must it be replaced?
A: This is a wear-item component. Due to the high-stress spline engagement and heat treatment, repair is not recommended. Replacement with the OEM genuine part ensures proper material hardness and dimensional accuracy.
Q: How do I know if my WG 190 needs this specific coupling?
A: Check the transmission serial number plate. If your model is WG 190 or WG 210, this coupling is the direct fit. For WG 180 or WG 200, verify the housing configuration using the related parts listed above.
Q: What torque specification is required for installation?
A: The coupling-to-housing bolts (use cap screw 0636100801) require 85 Nm with thread locker applied. Always consult the ZF service manual for your specific transmission variant.
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