Overview
The ZF 4642.302.161 INPUT SHAFT is a precision-machined, OEM genuine component engineered specifically for the WG 150 series transmission. This critical shaft transfers rotational power from the torque converter directly into the planetary gear set, serving as the primary torque input interface. Manufactured to ZF’s exacting tolerances, the SKU 4642.302.161 ensures minimal backlash and optimal load distribution under heavy-duty industrial cycles. When installed, it mates directly with the TRANSMISSION HOUSING (4642101108) and the TRANSMISSION HOUSING (4642301208), forming the central rotating assembly that drives all forward and reverse gears.
Symptoms of Failure
- Transmission gear slipping under load: A worn input shaft spline or bearing journal causes intermittent power loss, especially during uphill or heavy-pull operations.
- Oil leaks at the bell housing interface: Degraded shaft sealing surfaces allow ATF to weep past the front seal, leaving visible drips on the housing exterior.
- Abnormal whining or grinding noise: Pitting or scoring on the shaft’s bearing contact area produces a high-pitched metallic sound that intensifies with engine RPM.
- Delayed engagement from Neutral to Drive: Excessive axial play in the input shaft prevents proper clutch pack compression, causing a 2-3 second hesitation before gear engagement.
Technical Specifications
| Parameter | Value |
|---|---|
| Overall Length | 312 mm (estimated) |
| Shaft Diameter (bearing journal) | 45 mm |
| Spline Count (input end) | 24-tooth involute |
| Material | Case-hardened alloy steel (16MnCr5) |
| Weight | 2.85 kg |
| OEM Reference | ZF 4642.302.161 |
| Surface Treatment | Black oxide + phosphate coating |
Compatibility
This input shaft is designed for the ZF WG 150 series, but it also fits select variants of the WG 180 and WG 200 transmissions where the bell housing bolt pattern and spline count match. Always verify by cross-referencing the TYPE PLATE (0730365125) affixed to your unit. The shaft is secured in place using a GROOVED STUD (0631311009) that locks the bearing race axially. For complete rebuilds, pair this shaft with the ADAPTER (4642306254) and a new O-RING (0634303340) to prevent fluid bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4642301208 | TRANSMISSION HOUSING | Secondary housing for valve body |
| 0730365125 | TYPE PLATE | Identification tag with serial number |
| 0631311009 | GROOVED STUD | Axial retention for bearing assembly |
| 4642301168 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4642301169 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100621 | HEXAGON SCREW | Fastener for housing flanges |
| 0630361029 | SEALING CAP | Closes unused hydraulic ports |
| 4642306254 | ADAPTER | Converts input shaft spline interface |
| 0634303340 | O-RING | Seals shaft-to-housing joint |
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