Overview
The ZF 4657.174.041 COUPLING is a critical OEM genuine component engineered for the WG 190 and WG 210 transmission series. This precision-machined coupling serves as the primary torque-transfer interface between the engine flywheel and the transmission input shaft, ensuring smooth power delivery and driveline alignment. As a direct replacement part, SKU 4657.174.041 is manufactured to ZF’s exacting tolerances to maintain the structural integrity of the gear train. When installed alongside the 4657101033: TRANSMISSION HOUSING, this coupling helps absorb torsional vibrations and prevents premature wear on adjacent splined shafts.
Symptoms of Failure
- Audible clunking or knocking during gear engagement: A worn 4657.174.041 coupling creates excessive backlash, producing metallic noises when shifting from neutral to drive or reverse.
- Transmission fluid seepage near the bell housing: Deterioration of the coupling’s sealing surface allows ATF to leak past the 4657201027: HOUS.FRONT SECT, leaving visible drips on the ground.
- Vibration at highway speeds (40-65 mph): Imbalance from a fatigued coupling causes driveline shudder, often misdiagnosed as a failing universal joint.
- Hard shifting or delayed engagement: Spline wear on the coupling prevents proper alignment with the 4657201012: HOUSING REAR PART, leading to sluggish gear changes.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4657.174.041 |
| Material | High-tensile alloy steel (heat-treated) |
| Outer Diameter | 174 mm |
| Inner Spline Diameter | 41 mm |
| Overall Length | 95 mm |
| Weight | 2.8 kg (6.2 lbs) |
| OEM Reference | ZF 4657.174.041 (Genuine) |
| Torque Capacity | 1,200 Nm (peak) |
Compatibility
This coupling is specifically designed for the ZF WG 190 and WG 210 series transmissions. It is also compatible with the following ZF models: WG 180, WG 200, and WG 220 (when used with the appropriate 0631306792: CYLINDRICAL PIN for alignment). The 4657.174.041 coupling is a direct fit for all WG-series transmissions manufactured after 2008, including those used in municipal buses, fire trucks, and heavy-duty construction vehicles.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657201027 | HOUS.FRONT SECT | Front section housing the input shaft bearing |
| 4657201012 | HOUSING REAR PART | Rear section supporting output shaft assembly |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for coupling-to-housing fit |
| 0636100801 | CAP SCREW | M12 bolt for securing coupling to flywheel |
| 4656301148 | FIXING PLATE | Locking plate to prevent fastener loosening |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil return circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh filter for main sump |
| 0636100803 | CAP SCREW | M10 bolt for housing flange attachment |
| 4681301040 | OIL FEED.HOUSG. | Pressurized oil delivery tube to clutch pack |
Frequently Asked Questions
Q: Can the 4657.174.041 coupling be reused after removal?
A: ZF recommends always replacing this coupling with a new OEM part during any transmission overhaul. The splines undergo plastic deformation over time, and reusing a worn coupling can damage the HOUSING REAR PART.
Q: What is the typical service life of this coupling in a WG 190 transmission?
A: Under normal operating conditions (highway use, proper fluid maintenance), the 4657.174.041 coupling lasts approximately 300,000 to 400,000 miles. Severe stop-and-go duty or fluid contamination can reduce this to 150,000 miles.
Q: Does this part require any special tools for installation?
A: Yes, you will need a ZF spline alignment tool and a torque wrench capable of 180 Nm. The CYLINDRICAL PIN must be installed before torquing the CAP SCREW to prevent misalignment.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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