Overview
The ZF 4657.174.051 COUPLING is a critical torque-transfer component engineered specifically for the WG 190 and WG 210 series transmissions. Positioned between the engine flywheel and the transmission input shaft, this OEM genuine part ensures smooth power delivery and dampens torsional vibrations. The SKU 4657.174.051 is precision-machined to factory tolerances, guaranteeing a direct fit and long service life. This coupling works in concert with the 4657101049: TRANSMISSION HOUSING and the 4657301130: HOUS.FRONT SECT to maintain proper alignment and sealing within the drivetrain assembly.
Symptoms of Failure
- Torque fluctuation under load: A worn 4657.174.051 coupling causes uneven power transfer, resulting in surging or hesitation during acceleration.
- Metallic rattling at idle: Excessive clearance in the coupling produces a distinct clattering noise, often mistaken for loose flywheel bolts.
- Oil seepage near the bell housing: Deterioration of the coupling’s sealing surface allows transmission fluid to escape, leaving visible drips on the housing.
- Vibration through the chassis: A failing coupling fails to dampen engine harmonics, transmitting harsh vibrations into the cab or equipment frame.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4657.174.051 |
| Material | High-strength alloy steel with nitrided surface |
| Outer Diameter | 210 mm |
| Inner Diameter | 65 mm |
| Thickness | 28 mm |
| Weight | 1.85 kg |
| OEM Reference | ZF 4657.174.051 |
| Torque Capacity | 1,200 Nm |
Compatibility
This coupling is designed for ZF WG 191 series transmissions and is directly compatible with the WG 190 and WG 210 models. It also fits select variants of the WG 180 and WG 200 series when used with the correct 4657301131: HOUSING REAR PART and 0631306816: CYLINDRICAL PIN for alignment. Always verify your transmission’s serial number before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657301130 | HOUS.FRONT SECT | Front section housing input shaft bearings |
| 4657301131 | HOUSING REAR PART | Rear housing for output shaft support |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636102489 | CAP SCREW | M12 fastener for housing bolts |
| 4656301148 | FIXING PLATE | Retains coupling in axial position |
| 0636102463 | CAP SCREW | M10 bolt for coupling attachment |
| 4657201133 | SCREEN SHEET | Debris filter inside transmission pan |
| 0636115287 | CAP SCREW | M8 bolt for screen sheet retention |
| 4657301065 | PLATE | Spacer plate between housing sections |
Frequently Asked Questions
Q: Can the 4657.174.051 coupling be replaced without removing the transmission?
A: In most applications, the coupling is accessible after removing the bell housing cover. However, on WG 210 models with the HOUS.FRONT SECT installed, partial transmission removal may be required for clearance.
Q: What is the typical service life of this coupling?
A: Under normal operating conditions, the OEM coupling lasts 4,000–6,000 hours. Premature wear often indicates misalignment of the CYLINDRICAL PIN or damaged housing surfaces.
Q: Does this part include the fixing plate and cap screws?
A: No, the coupling is sold individually. You will need the FIXING PLATE and CAP SCREW separately for installation.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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