Overview
The ZF 4616.102.051 INPUT for WG65 is a critical driveline component engineered to transfer rotational force from the torque converter directly into the planetary gearset of your ZF transmission. Positioned at the forward end of the main shaft assembly, this OEM genuine part ensures precise alignment and torque distribution under heavy load conditions. The SKU 4616.102.051 is manufactured to exact ZF tolerances, guaranteeing seamless engagement with the clutch packs and reducing parasitic power loss. When paired with a robust TRANSMISSION HOUSING, this input shaft maintains structural integrity during high-torque shifts, making it indispensable for off-highway and industrial applications.
Symptoms of Failure
When the ZF 4616.102.051 input shaft begins to wear, operators often notice a distinct “gear slipping under load” sensation during acceleration, particularly in lower ratios. Another common failure indicator is a persistent “transmission input shaft oil leak” near the bell housing, caused by degraded sealing surfaces. You may also experience “hard shifting between forward and reverse” as the splines lose their interference fit, leading to delayed engagement. Finally, a “whining noise from the transmission case” at idle or low RPM typically signals bearing surface fatigue on this input component.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4616.102.051 |
| Material | Case-hardened alloy steel (20MnCr5) |
| Overall Length | 285 mm |
| Spline Major Diameter | 42 mm |
| Weight | 3.2 kg |
| Surface Hardness | 58-62 HRC |
| OEM Reference | ZF WG65 Series |
Compatibility
This input shaft is specifically designed for the ZF WG 65 series, including models such as the WG65, WG80, and WG100. It also fits select variants of the WG120 and WG150 transmissions where the input spline configuration matches the 42mm diameter. For proper installation, always verify the housing alignment using a CYLINDRICAL PIN to center the shaft, and secure it with a HEXAGON SCREW torqued to factory specifications. The part is not backward-compatible with older WG180 or WG200 models without modifying the HOUSING assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101116 | TRANSMISSION HOUSING | Encloses and supports the input shaft assembly |
| 0636011118 | HEXAGON SCREW | Secures the input shaft bearing retainer |
| 4616301307 | HOUSING | Intermediate housing for clutch pack alignment |
| 4616301309 | HOUSING | Rear housing adapter for output shaft support |
| 0636011038 | HEXAGON SCREW | Fastener for housing-to-bell housing joint |
| 0636016015 | HEXAGON SCREW | High-tensile bolt for main case flange |
| 0631306085 | CYLINDRICAL PIN | Alignment dowel for input shaft centering |
| 0634313118 | O-RING | Seals the input shaft bore against fluid loss |
| 0636304019 | SCREW PLUG | Closes the pressure tap port on the housing |
| 0634801152 | SEALING RING | Prevents oil migration at the shaft exit point |
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