Overview
The ZF 4660.174.013 COUPLING is a critical driveline component engineered for the WG 92 and WG 98 transmission series. This OEM genuine part serves as the primary mechanical link between the torque converter output and the planetary gearset input, ensuring precise torque transfer and rotational alignment. Positioned within the transmission housing assembly, this coupling absorbs torsional vibrations and maintains concentricity under high-load conditions. The SKU 4660.174.013 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty industrial applications.
Symptoms of Failure
- Torque converter shudder during gear engagement: A worn 4660.174.013 coupling causes noticeable vibration when shifting from neutral to drive, often misdiagnosed as a valve body issue.
- Intermittent loss of power under load: As the coupling splines wear, you may experience “slipping” sensations during acceleration, particularly in WG 98 series transmissions operating at maximum GVW.
- Metallic debris in transmission fluid: Failed couplings shed fine metal particles that contaminate the hydraulic circuit, leading to premature wear of the TRANSMISSION HOUSING and valve body components.
- Abnormal axial play at the input shaft: Excessive end float detected during inspection indicates the coupling’s internal splines have fatigued beyond service limits.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4660.174.013 |
| Material | Case-hardened alloy steel (16MnCr5 equivalent) |
| Outer Diameter | 98 mm ± 0.05 mm |
| Inner Spline Diameter | 42 mm (30-tooth involute spline) |
| Overall Length | 112 mm |
| Weight | 1.85 kg |
| OEM Reference | ZF 4660.174.013 (Genuine) |
| Torque Capacity | 2,450 Nm (continuous) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This coupling is specifically designed for ZF’s WG series powershift transmissions. Primary applications include the WG 92 and WG 98 models used in wheel loaders, dump trucks, and industrial tractors. It also retrofits to WG180 and WG200 variants when paired with the correct HOUSING II adapter. For proper installation, ensure the CYLINDRICAL PIN aligns with the torque converter hub, and verify the TYPE PLATE matches your transmission’s build date. Not compatible with ZF 4WG-200 or 5WG-300 series without additional spacer modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101020 | TRANSMISSION HOUSING | Main structural casing housing planetary gearsets |
| 4660301056 | HOUSING II | Intermediate housing supporting the coupling assembly |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for torque converter-to-coupling interface |
| 0769123894 | TYPE PLATE | Identification tag with transmission serial number |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports during coupling inspection |
| 4660221031 | SUCTION TUBE | Oil pickup tube routing fluid to the coupling lubrication circuit |
| 0634100317 | O-RING | Seals coupling-to-housing interface (37.5 x 3.5 mm) |
| 0636103273 | CAP SCREW | M12 x 1.5 fastener securing the coupling retaining plate |
| 0634306311 | O-RING | Secondary seal for the coupling’s axial retention groove |
| 4660321029 | FIXING PLATE | Locking plate preventing coupling rotation on the input shaft |
