Overview
The ZF 4657.275.011 COUPLING is a precision-engineered component designed for the WG 190 and WG 191 series transmissions. This OEM genuine part serves as the critical mechanical link between the torque converter output and the transmission input shaft, ensuring smooth power transfer and torsional vibration dampening. The SKU 4657.275.011 sits directly within the driveline assembly, interfacing with the TRANSMISSION HOUSING to maintain proper alignment and load distribution during operation.
Symptoms of Failure
- Torque converter shudder or vibration – A worn coupling causes noticeable driveline shudder during low-speed acceleration, often misdiagnosed as a failing torque converter.
- Delayed engagement or gear slipping – When the coupling loses its damping capacity, you may experience a lag between gear shifts or intermittent slipping under load, particularly in WG 190 series transmissions.
- Metallic debris in transmission fluid – Internal wear of the coupling generates fine metallic particles that contaminate the hydraulic circuit, leading to valve body clogging and erratic shifting.
- Abnormal noise from bell housing area – A rattling or knocking sound emanating from the front of the transmission indicates excessive play in the coupling assembly.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.275.011 |
| Material | High-tensile steel with nitrided surface |
| Outer Diameter | 210 mm (estimated) |
| Inner Diameter | 85 mm (estimated) |
| Overall Length | 95 mm (estimated) |
| Weight | 3.2 kg (7.0 lbs) |
| OEM Reference | ZF 4657.275.011 |
| Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This coupling is engineered for ZF WG 190 and WG 191 series transmissions. It also fits WG 180, WG 200, and WG 210 models where the coupling interface matches the spline count and pilot bore dimensions. Always verify the CYLINDRICAL PIN alignment when installing, as incorrect pin fitment can damage the HOUS.FRONT SECT and HOUSING REAR PART.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Encloses and supports the gear train assembly |
| 4657201028 | HOUS.FRONT SECT | Front section of the transmission housing |
| 4657201013 | HOUSING REAR PART | Rear section of the transmission housing |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Retains coupling in position |
| 4657301034 | SCREEN SHEET | Filter screen for oil circuit |
| 4657301035 | SCREEN SHEET | Secondary filter screen |
| 0636100803 | CAP SCREW | Fastener for coupling mounting |
| 4681301040 | OIL FEED.HOUSG. | Oil feed housing for lubrication |
Frequently Asked Questions
Q: Can I replace the ZF 4657.275.011 coupling without removing the transmission?
A: In most WG 190 and WG 210 applications, the coupling is accessible after removing the bell housing cover. However, for proper alignment with the HOUS.FRONT SECT, transmission removal is recommended to avoid damaging the CYLINDRICAL PIN.
Q: How does this coupling differ from a standard flex plate?
A: Unlike a flex plate, the 4657.275.011 coupling incorporates internal damping elements to absorb torsional vibrations. It is a direct OEM replacement for ZF WG series transmissions and must be paired with the correct FIXING PLATE for secure installation.
Q: What torque specification is required for the mounting bolts?
A: The CAP SCREW fasteners should be torqued to 85 Nm (63 ft-lbs) in a cross-tightening pattern. Always use new CAP SCREW hardware when reinstalling the coupling.
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Phone: +86 158 2286 3467 |
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