Overview
The ZF 4656.172.061 COUPLING is a critical torque-transfer component engineered for the WG 130 and WG 160 transmission series. Positioned between the engine output and the transmission input shaft, this OEM genuine part ensures precise rotational alignment and dampens torsional vibrations during gear shifts. The SKU 4656.172.061 is manufactured to ZF’s exacting tolerances, guaranteeing a direct fit within the WG 171 Series assembly. When paired with the TRANSMISSION HOUSING, this coupling maintains structural integrity under high-load conditions, reducing wear on adjacent driveline components.
Symptoms of Failure
- Torque fluctuation during acceleration — A worn coupling causes inconsistent power delivery, often described as “jerking” or “surging” when the transmission shifts under load.
- Metallic rattling from the bell housing — Loose or fatigued coupling teeth produce a distinct chatter, especially at idle or low RPM, indicating imminent spline failure.
- Oil seepage near the input shaft seal — Degraded coupling surfaces can misalign the HOUS.FRONT SECT, leading to seal distortion and fluid leaks.
- Delayed engagement from Park to Drive — Excessive coupling backlash creates a noticeable lag before torque is transmitted, often accompanied by a dull thud.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4656.172.061 |
| Outer Diameter | 172 mm |
| Inner Spline Diameter | 61 mm |
| Material | Heat-treated alloy steel (42CrMo4) |
| Weight | 2.85 kg |
| OEM Reference | ZF 4656.172.061 |
| Torque Capacity | 1,200 Nm (peak) |
Compatibility
This coupling is specifically designed for ZF WG 130 and WG 160 transmissions, which are commonly used in medium-duty trucks, buses, and construction machinery. It also fits the WG 171 Series and is compatible with WG 180 and WG 200 models when used with the correct SCREEN SHEET and TUBE assemblies. Always verify spline count and pilot bore dimensions before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101072 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 4656301168 | HOUS.FRONT SECT | Front section housing for input shaft bearings |
| 4656201015 | SCREEN SHEET | Filter mesh protecting oil passages from debris |
| 4656301037 | TUBE | Oil delivery tube for lubrication circuit |
| 0634313514 | O-RING | Seals coupling-to-housing interface |
| 0636100803 | CAP SCREW | M10 fastener for coupling retention |
| 4656301169 | HOUSING REAR PART | Rear section housing for output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing doweling |
| 0636100801 | CAP SCREW | M8 fastener for front housing |
| 0636100160 | CAP SCREW | M6 fastener for screen sheet retention |
Frequently Asked Questions
Q: Can the 4656.172.061 coupling be used in a ZF WG 200 transmission?
A: Yes, but only if the input shaft spline count matches. The WG 200 requires a 14-tooth spline; verify your existing coupling before ordering. Always replace the O-RING simultaneously to prevent oil leaks.
Q: What torque specification should I use for the coupling bolts?
A: ZF recommends 85 Nm for the CAP SCREW fasteners, applied in a cross-tightening pattern. Over-torquing can distort the coupling hub and cause premature failure.
Q: How do I know if my coupling is OEM genuine?
A: Genuine ZF parts have a laser-etched part number and a matte black oxide finish. Counterfeit parts often show rough machining marks and lack the ZF logo. Cross-reference with the HOUSING REAR PART for proper alignment.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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