Overview
The ZF 4616.108.020 COUNTERSHAFT is a critical internal component engineered specifically for the WG 65 Series transmission. This genuine OEM part serves as the primary torque-transfer shaft, synchronizing gear rotation and distributing engine power through the gear train. Located within the main transmission housing, the countershaft works in direct conjunction with the 4616105415: OUTPUT assembly to ensure smooth power delivery. The SKU 4616.108.020 is precision-machined to ZF factory tolerances, guaranteeing a perfect fit and long service life in heavy-duty industrial applications.
Symptoms of Failure
When the 4616.108.020 countershaft begins to wear, operators may notice distinct operational issues. Gear slipping under load is a primary indicator, often accompanied by a grinding noise during acceleration. Vibration in the driveline at specific RPM ranges suggests bearing surface degradation on the shaft. Oil contamination with metallic debris in the sump signals advanced wear of the countershaft splines or journals. Additionally, difficulty engaging gears or a sudden loss of power transmission can occur, requiring immediate inspection of this component alongside the 4616303144: OUTPUT FLANGE.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4616.108.020 |
| OEM Reference | ZF 4616.108.020 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | ~420 mm |
| Journal Diameter | ~45 mm |
| Spline Count | 24 (involute profile) |
| Weight | ~8.2 kg |
| Hardness | 58-62 HRC (surface) |
| Surface Finish | Ground and polished |
Compatibility
This ZF 4616.108.020 countershaft is designed for the WG 65 Series transmission family. Based on its shaft geometry and spline configuration, it is compatible with the following ZF models: WG65, WG80, WG100, and WG120. It also fits select variants of the WG180 and WG200 series where the countershaft length and bearing spacing match. Always verify the existing 4616101094: TRANSMISSION HOUSING dimensions before installation. Secure the assembly using the correct 0636011038: HEXAGON SCREW fasteners to maintain proper preload.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105415 | Output | Transfers torque from countershaft to driveline |
| 4616303144 | Output Flange | Connects output shaft to universal joint |
| 4616101094 | Transmission Housing | Encloses and supports countershaft assembly |
| 0636011038 | Hexagon Screw | Secures bearing caps to housing |
| 0636011118 | Hexagon Screw | Fastens output flange to shaft |
| 0636016015 | Hexagon Screw | Mounts countershaft support bracket |
| 0631306085 | Cylindrical Pin | Aligns countershaft to housing bore |
| 0634313118 | O-Ring | Seals countershaft bearing cavity |
| 0732611049 | Filter Insert | Traps debris from countershaft wear |
| 0634303718 | O-Ring | Seals output flange interface |
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