Overview
The ZF 4616.102.049 INPUT for WG65 is a critical OEM genuine component that serves as the primary torque-receiving interface within the WG 65 Series transmission assembly. This input shaft assembly transfers rotational force directly from the engine flywheel into the planetary gear sets, making it the first mechanical point of energy conversion in the drivetrain. The SKU 4616.102.049 is precision-machined to ZF’s exacting tolerances, ensuring seamless alignment with the TRANSMISSION HOUSING and the downstream OUTPUT assembly. Without this input shaft, the transmission cannot initiate gear engagement, making it a non-negotiable component for any WG65 rebuild or repair.
Symptoms of Failure
- Torque converter shudder during acceleration: A worn input shaft spline causes intermittent power delivery, often misdiagnosed as a converter issue.
- Transmission fluid leaks at the bell housing: Deterioration of the input shaft seal surface leads to visible oil drips, a common long-tail search query for “ZF WG65 front seal leak.”
- Gear slipping under load: When the input shaft bearing race wears, planetary gear sets lose hydraulic pressure, resulting in delayed or slipping shifts.
- Metallic debris in the oil pan: Spalling on the input shaft’s hardened surface generates fine metal particles, detectable during routine fluid changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.102.049 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 312 mm |
| Spline Diameter | 38 mm (input end) |
| Weight | 4.2 kg |
| OEM Reference | ZF 4616.102.049 (genuine) |
| Surface Treatment | Nitrided for wear resistance |
Compatibility
This input shaft is engineered specifically for the WG 65 Series transmission family, which includes the WG65, WG80, and WG90 models. It is also backward-compatible with certain WG180 and WG200 variants that share the same input spline geometry and bearing journal dimensions. Always verify the OUTPUT FLANGE alignment and the HEXAGON SCREW torque specifications when installing this part to avoid premature wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105415 | OUTPUT | Transfers torque from planetary gears to driveshaft |
| 4616303144 | OUTPUT FLANGE | Connects output shaft to driveline yoke |
| 4616101094 | TRANSMISSION HOUSING | Encloses and supports all rotating assemblies |
| 0636011038 | HEXAGON SCREW | Secures input shaft bearing retainer |
| 0636011118 | HEXAGON SCREW | Fastens output flange to shaft |
| 0636016015 | HEXAGON SCREW | Mounts housing to bell housing |
| 0631306085 | CYLINDRICAL PIN | Aligns input shaft to pump drive |
| 0634313118 | O-RING | Seals input shaft bore in housing |
| 0732611049 | FILTER INSERT | Captures debris from worn input shaft |
| 0634303718 | O-RING | Seals output flange joint |
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