Overview
The ZF 4616.102.021 INPUT for WG65 is a critical driveline component engineered to transfer torque from the engine directly into the transmission’s planetary gearset. As an OEM genuine part, this input shaft assembly ensures precise alignment and minimal rotational play within the WG 65 series housing. The SKU 4616.102.021 is machined from high-strength alloy steel to withstand the cyclic loads common in heavy-duty industrial applications. This component sits at the front of the transmission, coupling directly with the torque converter and the TRANSMISSION HOUSING to form the primary power path. Without a properly functioning input shaft, the entire gearbox cannot engage or maintain forward motion.
Symptoms of Failure
- Oil leaks around the bell housing: When the 4616.102.021 input shaft seal surface wears, transmission fluid seeps past the SEALING RING, leaving puddles under the vehicle.
- Gear slipping under load: A worn input shaft spline cannot hold the clutch pack securely, causing intermittent power loss during acceleration or hill climbs.
- Abnormal vibration at idle: Bearing journal wear on this input shaft creates rhythmic shaking that intensifies when the transmission is in gear but the vehicle is stationary.
- Hard shifting or delayed engagement: Excessive axial play in the input shaft prevents the hydraulic control system from pressurizing clutches correctly, leading to harsh or delayed gear changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.102.021 |
| Material | Alloy Steel (case-hardened) |
| Overall Length | 245 mm |
| Spline Diameter | 32 mm |
| Weight | 2.8 kg |
| OEM Reference | ZF 4616.102.021 |
| Surface Treatment | Nitrided |
Compatibility
This genuine ZF input shaft is specifically designed for the WG 65 series transmission family. It is directly compatible with models including WG65, WG180, WG200, and WG250. The 4616.102.021 part also fits select ZF Ecomat 4HP and 5HP variants that share the same input spline geometry. Always verify the spline count and pilot bearing diameter against your existing shaft before installation. When replacing this input, we recommend also inspecting the HEXAGON SCREW (M10 x 30) and the HEXAGON SCREW (M12 x 35) that secure the input shaft to the torque converter hub. Additionally, the HEXAGON SCREW (M14 x 45) used in the housing flange should be replaced to prevent fastener fatigue.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101059 | TRANSMISSION HOUSING | Encloses and supports all internal gear train components |
| 0636011038 | HEXAGON SCREW | Secures input shaft to torque converter hub |
| 0636011118 | HEXAGON SCREW | Fastens bearing retainer to housing |
| 0636016015 | HEXAGON SCREW | Mounts transmission to engine bell housing |
| 0631306085 | CYLINDRICAL PIN | Aligns input shaft with clutch drum |
| 0634313118 | O-RING | Seals input shaft bore against fluid leakage |
| 0636304019 | SCREW PLUG | Closes oil gallery access port |
| 0634801152 | SEALING RING | Prevents oil migration along shaft surface |
| 0732611049 | FILTER INSERT | Captures debris from hydraulic circuit |
| 0634303718 | O-RING | Seals filter housing to valve body |
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