Overview
The ZF 4657.174.059 COUPLING is a precision-engineered component designed to transmit torque between the engine and the transmission input shaft in ZF WG 190 and WG 210 series transmissions. This OEM genuine part, identified by SKU 4657.174.059, sits directly within the driveline assembly, connecting the flywheel to the torque converter or clutch system. It ensures smooth power transfer and dampens torsional vibrations, protecting downstream gears and shafts from shock loads. When paired with a robust TRANSMISSION HOUSING, this coupling maintains alignment and reduces wear on adjacent components.
Symptoms of Failure
- Oil leaks near the bell housing: Worn seals on the coupling allow transmission fluid to escape, leaving puddles under the vehicle and causing low fluid levels.
- Gear slipping under load: A degraded coupling fails to maintain consistent torque transfer, resulting in hesitation or slipping when accelerating or climbing grades.
- Vibration during shifting: Excessive play in the coupling produces noticeable shuddering or shaking when the transmission shifts between gears, especially at low speeds.
- Metallic grinding noises: Broken or fatigued coupling elements create a distinct grinding sound from the transmission housing, indicating imminent failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.174.059 |
| Outer Diameter | 210 mm (estimated) |
| Inner Diameter | 120 mm (estimated) |
| Thickness | 45 mm (estimated) |
| Material | High-strength alloy steel with rubber damping insert |
| Weight | 3.2 kg (estimated) |
| OEM Reference | ZF 4657.174.059 |
| Fastener Type | Compatible with CAP SCREW (0636100801) and CAP SCREW (0636100803) |
| Alignment Pin | Uses CYLINDRICAL PIN (0631306816) |
Compatibility
This coupling is engineered for ZF WG 190 and WG 210 series transmissions, commonly found in medium-duty trucks, buses, and industrial machinery. It is also compatible with the WG 180 and WG 200 models, as these share the same bell housing bolt pattern and input shaft dimensions. For proper installation, ensure the HOUS.FRONT SECT (4657201161) and HOUSING REAR PART (4657201162) are free of cracks or warping. The coupling also integrates with the HOUSING REAR SECTION (4657298107) to seal the driveline chamber.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101085 | TRANSMISSION HOUSING | Encloses and supports all internal transmission components |
| 4657201161 | HOUS.FRONT SECT | Front section of the housing, aligns the coupling and input shaft |
| 4657201162 | HOUSING REAR PART | Rear housing section that supports the output shaft and bearings |
| 4657298107 | HOUSING REAR SECTION | Additional rear housing segment for extended transmission configurations |
| 0631306816 | CYLINDRICAL PIN | Precision pin for aligning housing sections and the coupling |
| 0636100801 | CAP SCREW | Secures the coupling to the flywheel or torque converter |
| 4656301148 | FIXING PLATE | Locks the coupling in place to prevent axial movement |
| 4657301032 | SCREEN SHEET | Filters debris from transmission fluid near the coupling area |
| 4657301033 | SCREEN SHEET | Secondary filter screen for additional fluid cleanliness |
| 0636100803 | CAP SCREW | Alternative fastener for securing the coupling to the housing |
Frequently Asked Questions
Q: How do I know if the 4657.174.059 coupling needs replacement?
A: Look for visible oil leaks around the bell housing, unusual vibrations during gear shifts, or a metallic grinding noise when the transmission is under load. These symptoms indicate the coupling’s damping material or splines have worn out.
Q: Can this coupling be installed without replacing the housing sections?
A: Yes, but it is strongly recommended to inspect the HOUS.FRONT SECT and HOUSING REAR PART for wear. A damaged housing can cause premature coupling failure.
Q: What torque specification should I use for the cap screws?
A: For the CAP SCREW (0636100801) and CAP SCREW (0636100803), tighten to 45 Nm in a cross-pattern sequence. Always refer to the ZF service manual for your specific transmission model.
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Phone: +86 158 2286 3467 |
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