Overview
The ZF 4657.171.027 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 seamless power delivery and driveline alignment. Designed to absorb torsional vibrations and dampen shock loads, the SKU 4657.171.027 sits directly within the bell housing assembly, where it mates with the TRANSMISSION HOUSING to maintain concentricity. Its robust construction is vital for maintaining gear mesh accuracy and preventing premature wear in heavy-duty industrial applications.
Symptoms of Failure
- Torque Fluctuation Under Load: A worn 4657.171.027 coupling causes erratic power transfer, leading to noticeable surging or hesitation during acceleration, especially in WG 210 series transmissions.
- Metallic Rattle at Idle: Excessive clearance in the coupling produces a distinct rattling noise from the bell housing area, often misdiagnosed as a failing pilot bearing.
- Oil Contamination from Slippage: Internal wear generates fine metal particles that mix with transmission fluid, resulting in dark, gritty oil and reduced hydraulic pressure.
- Vibration Through the Driveline: A degraded coupling fails to dampen torsional vibrations, transmitting harshness to the HOUS.FRONT SECT and causing premature bearing failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.171.027 |
| Material | High-strength alloy steel with nitrided surface |
| Outer Diameter | 180 mm (7.09 in) |
| Inner Diameter | 65 mm (2.56 in) |
| Overall Length | 95 mm (3.74 in) |
| Weight | 2.8 kg (6.17 lbs) |
| OEM Reference | ZF 4657.171.027 |
| Torque Capacity | 1,200 Nm (885 lb-ft) |
| Operating Temperature | -40°C to +120°C (-40°F to +248°F) |
Compatibility
This coupling is specifically designed for ZF WG 190 and WG 210 series transmissions, including the WG 190, WG 200, and WG 210 models. It is also compatible with the BP 210 series power take-off units. The 4657.171.027 interfaces directly with the HOUSING REAR PART and the HOUSING REAR SECTION to ensure proper alignment. For complete assembly, verify that the coupling matches your transmission’s spline count and pilot bore diameter.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101078 | TRANSMISSION HOUSING | Encloses and supports all internal transmission components |
| 4657201166 | HOUS.FRONT SECT | Front section of the transmission housing, supports input shaft |
| 4657201168 | HOUSING REAR PART | Rear housing section, houses output shaft and bearings |
| 4657298101 | HOUSING REAR SECTION | Additional rear housing segment for extended transmissions |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise housing mating |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Locks coupling to prevent axial movement |
| 4657301032 | SCREEN SHEET | Filter screen for oil return circuit |
| 4657301033 | SCREEN SHEET | Secondary filter screen for hydraulic system |
| 0636100803 | CAP SCREW | High-tensile fastener for coupling retention |
Frequently Asked Questions
Q: Can the 4657.171.027 coupling be reused after removal?
A: No. This is a wear item that deforms slightly during installation to create a press fit. Reusing it can cause misalignment and rapid failure of the TRANSMISSION HOUSING.
Q: What tools are needed to replace this coupling?
A: You will need a bearing puller, torque wrench, and alignment tool. Always replace the CYLINDRICAL PIN and CAP SCREW during installation.
Q: Does this coupling fit the WG 180 transmission?
A: No. The 4657.171.027 is dimensionally specific to WG 190 and WG 210 series. For WG 180 applications, consult the HOUSING REAR SECTION specifications to identify the correct part.
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Phone: +86 158 2286 3467 |
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