Overview
The ZF 4616.102.420 INPUT for WG65 is a critical OEM genuine component engineered for the input section of the WG 65 Series transmission. This precision-machined part serves as the primary torque-receiving interface between the engine coupling and the planetary gear set, ensuring smooth power transfer under heavy-duty industrial loads. The SKU 4616.102.420 is designed to withstand high rotational stresses and thermal expansion, making it indispensable for maintaining drivetrain integrity. When installed correctly, this input component works in concert with the TRANSMISSION HOUSING (4616101066) to create a sealed, durable assembly that resists contamination and vibration fatigue.
Symptoms of Failure
- Transmission oil leaks at the input shaft seal: Worn splines or bearing surfaces on the 4616.102.420 can cause seal misalignment, leading to fluid seepage around the bell housing area.
- Gear slipping under load in WG65 units: Degraded input gear teeth or spline wear results in intermittent power loss, especially during acceleration or uphill operation.
- Unusual whining or grinding noises from the transmission front: Excessive play in the input bearing journal creates metallic contact sounds that intensify with engine RPM.
- Vibration through the shift lever or chassis: A failing input component can induce driveline shudder due to uneven torque distribution across the planetary set.
Technical Specifications
| Part Number | 4616.102.420 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 4.2 kg (9.26 lbs) |
| Input Spline Count | 14-tooth, 30° pressure angle |
| Overall Length | 187 mm |
| Bearing Journal Diameter | 55 mm |
| OEM Reference | ZF 4616.102.420 (Genuine) |
| Torque Capacity | 2,450 Nm (peak) |
Compatibility
This input component is specifically designed for the ZF WG 65 Series, but it also fits select models within the broader WG family due to shared modular architecture. Compatible transmissions include:
- ZF WG65 (primary application)
- ZF WG180 (with adapter housing modifications)
- ZF WG200 (early production variants)
- ZF WG120 (limited compatibility, verify spline count)
For proper installation, always pair the 4616.102.420 with the HEXAGON SCREW (0636011118) to secure the input to the clutch drum. The HOUSING (4616301307) and HOUSING (4616301309) provide the structural enclosure for this assembly, ensuring correct axial alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101066 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 0636011118 | HEXAGON SCREW | Fastener for input shaft retention |
| 4616301307 | HOUSING | Intermediate support housing |
| 4616301309 | HOUSING | Rear housing for output section |
| 0636011038 | HEXAGON SCREW | Mounting bolt for bell housing |
| 0636016015 | HEXAGON SCREW | High-tensile flange bolt |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0634313118 | O-RING | Static seal for oil passages |
| 0636304019 | SCREW PLUG | Oil drain or fill port closure |
| 0634801152 | SEALING RING | Copper crush washer for plugs |
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