Overview
The ZF 4657.275.014 COUPLING is a precision-engineered OEM genuine component designed for the WG 190 and WG 191 series transmissions. This coupling serves as a critical torque transfer interface between the engine output and the transmission input shaft, ensuring smooth power delivery and driveline alignment. The SKU 4657.275.014 is specifically machined to absorb torsional vibrations and compensate for minor misalignments, protecting the gear train from excessive stress. Installed directly within the bell housing area, this part works in concert with the 4657101085: TRANSMISSION HOUSING to maintain structural integrity during high-torque operations.
Symptoms of Failure
- Oil leaks around the bell housing: A worn 4657.275.014 coupling often leads to seal degradation, causing transmission fluid to weep from the joint between the engine and transmission.
- Gear slipping under load: When this coupling loses its damping capacity, you may experience intermittent gear slippage during acceleration, particularly in WG 190 and WG 191 units.
- Metallic rattling at idle: A failing coupling produces a distinct clattering noise from the transmission front section, indicating excessive play in the driveline connection.
- Vibration through the chassis: Worn splines or elastomeric elements cause noticeable driveline shudder, especially between 1,200 and 1,800 RPM.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.275.014 |
| Material | High-strength alloy steel with nitrided surface |
| Weight | 2.85 kg (6.28 lbs) |
| Outer Diameter | 195 mm |
| Inner Diameter | 65 mm |
| Overall Length | 112 mm |
| OEM Reference | ZF 4657.275.014 |
Compatibility
This OEM coupling is engineered for ZF WG 190 and WG 191 series transmissions. Based on its design and mounting pattern, it is also compatible with WG 180, WG 200, and WG 210 models that share the same bell housing architecture. The 4657.275.014 interfaces directly with the 4657201161: HOUS.FRONT SECT and the 4657201162: HOUSING REAR PART to form a sealed assembly. For complete rebuilds, pairing this coupling with the 4657298107: HOUSING REAR SECTION ensures proper alignment and long service life.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101085 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4657201161 | HOUS.FRONT SECT | Front section housing for input shaft support |
| 4657201162 | HOUSING REAR PART | Rear housing segment for output bearing retention |
| 4657298107 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M10 fastener for coupling-to-hub attachment |
| 4656301148 | FIXING PLATE | Locking plate for coupling bolt retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic circuit protection |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump return line |
| 0636100803 | CAP SCREW | M12 bolt for housing-to-bell housing connection |
Frequently Asked Questions
Q: How do I know if the 4657.275.014 coupling is failing on my WG 190?
A: Listen for a metallic rattle at idle and check for oil seepage at the bell housing seam. If you feel driveline shudder during low-RPM acceleration, the coupling’s damping element is likely worn.
Q: Can I replace the coupling without removing the transmission?
A: No. The 4657.275.014 sits between the engine and transmission input shaft, requiring separation of the transmission from the engine. You must also remove the 4657201161: HOUS.FRONT SECT for access.
Q: What torque specification applies to the coupling bolts?
A: Use 85 Nm (63 ft-lbs) for the M10 cap screws (part 0636100801) and apply thread locker. Always replace the 4656301148: FIXING PLATE during reassembly.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
