Overview
The ZF 4616.102.029 INPUT for WG65 is a precision-engineered OEM genuine component designed to manage torque transfer from the engine to the planetary gearset within ZF’s WG series transmissions. Positioned at the front of the main gearbox housing, this input shaft assembly absorbs high rotational loads and ensures smooth engagement during shifting cycles. The SKU 4616.102.029 is manufactured to ZF’s original tolerances, making it a direct replacement for worn units in heavy-duty applications. When paired with a compatible OUTPUT and OUTPUT FLANGE, this part restores driveline integrity and prevents premature wear on adjacent components.
Symptoms of Failure
- Delayed or harsh engagement: A worn input shaft can cause noticeable lag when shifting from neutral to drive, often accompanied by a clunking noise under load.
- Transmission fluid leaks at the bell housing: Deterioration of the input shaft seal surface leads to oil seepage, visible as drips near the engine-transmission junction.
- Vibration during acceleration: Excessive play in the input splines creates driveline shudder, particularly at low RPMs when torque demand is highest.
- Intermittent gear slipping: As the input shaft loses its precise fit with the clutch hub, power delivery becomes inconsistent, triggering fault codes in electronic controls.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.102.029 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | 245 mm (approx.) |
| Spline Diameter | 32 mm (input end) |
| Weight | 3.8 kg (8.4 lbs) |
| OEM Reference | ZF 4616.102.029 |
| Surface Treatment | Black oxide corrosion protection |
Compatibility
This input shaft is engineered for the WG 65 Series transmission family, which includes models such as WG180, WG200, and WG250 used in municipal trucks, refuse vehicles, and medium-duty construction equipment. It also fits select WG65 variants with a 10-bolt input pattern. Always verify the spline count and pilot bearing diameter against your existing assembly. For a complete rebuild, consider replacing the TRANSMISSION HOUSING if cracks are present, and secure all fasteners with the correct HEXAGON SCREW torque specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105402 | OUTPUT | Transfers torque from planetary gears to driveline |
| 4005303005 | OUTPUT FLANGE | Connects output shaft to driveshaft yoke |
| 4616101119 | TRANSMISSION HOUSING | Encloses gearset and supports bearing bores |
| 0636011038 | HEXAGON SCREW | M10 bolt for housing-to-bell housing joint |
| 0636011118 | HEXAGON SCREW | M12 bolt for output flange retention |
| 0636016015 | HEXAGON SCREW | M8 bolt for oil pan attachment |
| 0631306085 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0634313118 | O-RING | Seals input shaft bore against fluid loss |
| 0636304019 | SCREW PLUG | Closes pressure test ports on housing |
| 0634801152 | SEALING RING | Prevents oil weep at flange interface |
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