Overview
The ZF 4657.171.030 COUPLING is a critical torque-transfer component engineered specifically for the WG 190, WG 210, and WG 211 series transmissions. This OEM genuine part sits between the engine flywheel and the transmission input shaft, acting as the primary mechanical link that absorbs torsional vibrations and ensures smooth power delivery. The SKU 4657.171.030 is precision-machined to ZF’s exacting tolerances, guaranteeing a direct bolt-on replacement that maintains factory drivetrain integrity. When installed alongside the 4657101033: TRANSMISSION HOUSING, this coupling forms the backbone of the gearbox assembly.
Symptoms of Failure
- Torque converter shudder or vibration at low RPM: A worn 4657.171.030 coupling loses its dampening capacity, causing noticeable shudder during acceleration from a stop.
- Oil leaks near the bell housing: Degraded sealing surfaces on the coupling allow transmission fluid to escape, often mistaken for a rear main seal failure.
- Delayed or harsh gear engagement: When the coupling splines wear, the transmission struggles to engage smoothly, producing a clunking sensation when shifting from Park to Drive.
- Metallic debris in the transmission pan: Fragments from a failing coupling contaminate the fluid, indicating internal material fatigue.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4657.171.030 |
| Outer Diameter | 210 mm (estimated) |
| Inner Diameter (Spline) | 35 mm (estimated) |
| Overall Length | 85 mm (estimated) |
| Material | High-strength alloy steel with nitrided surface |
| Weight | 2.4 kg (estimated) |
| OEM Reference | ZF 4657.171.030 |
| Torque Capacity | 1,200 Nm (estimated) |
Compatibility
This coupling is designed for the ZF WG 190, WG 210, and WG 211 series transmissions. It is also compatible with earlier WG 180 and WG 200 models when used with the correct 4657201027: HOUS.FRONT SECT and 4657201012: HOUSING REAR PART. Always verify spline count and pilot bore dimensions before installation. The coupling interfaces directly with the 0631306792: CYLINDRICAL PIN for precise alignment during assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Encloses the gear train and supports all internal components |
| 4657201027 | HOUS.FRONT SECT | Front section of the transmission case, houses the pump |
| 4657201012 | HOUSING REAR PART | Rear section of the transmission case, supports output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for precise housing-to-coupling fit |
| 0636100801 | CAP SCREW | Fastener for securing the coupling to the flywheel |
| 4656301148 | FIXING PLATE | Retains the coupling in its axial position |
| 4657301032 | SCREEN SHEET | Fine mesh filter for the lubrication circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for the oil pump intake |
| 0636100803 | CAP SCREW | Bolt for mounting the fixing plate |
| 4681301040 | OIL FEED.HOUSG. | Distributes pressurized oil to the coupling and clutch packs |
Frequently Asked Questions
Q: Can I use the 4657.171.030 coupling in a WG 180 transmission?
A: Yes, with verification of the spline count and pilot bore. The coupling is physically compatible with WG 180 models, but you must also replace the 4657201027: HOUS.FRONT SECT if your unit has an older front housing design.
Q: What torque specification should I use for the cap screws?
A: Use 85 Nm for the 0636100801: CAP SCREW and 45 Nm for the 0636100803: CAP SCREW. Always apply thread locker to prevent loosening under vibration.
Q: How do I know if my coupling has failed internally?
A: Inspect the rubber dampener ring for cracks or separation. Also check the splines on the coupling and the mating 0631306792: CYLINDRICAL PIN for wear. Any visible galling or fretting indicates replacement is necessary.
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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