Overview
The ZF 4644.102.215 INPUT for WG181 is a precision-engineered input shaft assembly that serves as the primary torque-transfer interface between the engine and the transmission gearset. Positioned at the front of the WG 181 series gearbox, this OEM genuine component ensures smooth power delivery and alignment within the drivetrain. The SKU 4644.102.215 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn or damaged units in heavy-duty industrial applications. When paired with a robust TRANSMISSION HOUSING, this input shaft maintains structural integrity under high load cycles, reducing vibration and extending overall transmission life.
Symptoms of Failure
- Oil leaks near the front seal area: A worn input shaft can damage the seal lip, causing transmission fluid to weep or stream from the bell housing, often noticed as puddles under the vehicle.
- Gear slipping under acceleration: When the input shaft splines wear, the clutch disc cannot engage fully, leading to intermittent power loss or delayed engagement in forward gears.
- Abnormal whining or grinding noises: Bearing surface degradation on the 4644.102.215 shaft produces a high-pitched whine that increases with engine RPM, indicating imminent failure.
- Hard shifting or gear clash: Misalignment caused by a bent or worn input shaft prevents smooth synchronization, resulting in grinding during gear changes, especially in lower ratios.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.102.215 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 312 mm (estimated) |
| Spline Diameter | 28 mm (10-spline, 30° pressure angle) |
| Weight | 2.85 kg (6.28 lbs) |
| OEM Reference | ZF 4644.102.215 |
| Surface Finish | Black oxide coated for corrosion resistance |
Compatibility
This input shaft is specifically designed for the ZF WG 181 series, but it also fits select models in the WG180 and WG200 families due to shared spline geometry and bearing journals. Compatible transmissions include WG180, WG181, WG190, and WG200 variants used in off-highway trucks, agricultural tractors, and industrial loaders. Always verify the input shaft length and pilot bearing diameter against your existing unit before installation. For complete assembly, ensure the HOUSING is free of cracks and that the THREADED BUSH is torqued to specification. The TYPE PLATE on your transmission will confirm the exact series designation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101047 | TRANSMISSION HOUSING | Encloses and supports the gear train and input shaft |
| 4644301380 | HOUSING | Secondary casing for clutch and bearing retention |
| 4644301189 | THREADED BUSH | Provides threaded anchor for input shaft bearing preload |
| 0730365067 | TYPE PLATE | Identification plate with transmission model and serial number |
| 0631311009 | GROOVED STUD | Locates and secures the input shaft bearing race |
| 4644301161 | COVER PLATE | Seals the front bearing cavity against debris ingress |
| 0636100621 | HEXAGON SCREW | Fastens cover plate and housing sections |
| 0631610020 | SET SCREW | Locks the input shaft axial position |
| 0634801098 | SEALING RING | Prevents oil leakage at the shaft exit point |
| 4644301117 | FIXING PLATE | Retains the input shaft bearing in the housing |
