Overview
The ZF 4616.108.028 COUNTERSHAFT is a critical rotating component within the WG 65 series transmission, responsible for transferring torque between gear clusters and enabling precise ratio changes under heavy load. This OEM genuine part (SKU: 4616.108.028) sits centrally in the gear train, supported by bearings and aligned with the main shaft to ensure smooth power delivery. When paired with a robust 4616101101: TRANSMISSION HOUSING, the countershaft maintains gear mesh integrity, reducing vibration and extending service intervals in demanding industrial applications.
Symptoms of Failure
- Gear grinding or slipping under load: Worn splines or bearing journals on the countershaft cause intermittent engagement, leading to harsh shifting and power loss during acceleration.
- Excessive drivetrain noise (whining or rumbling): Degraded surface hardness or micro-pitting on the shaft creates abnormal contact patterns, producing audible noise that worsens with higher RPM.
- Metallic debris in transmission oil: Flaking or spalling from the countershaft contaminates the lubricant, often detected during routine oil changes or filter inspections.
- Vibration through the chassis: A bent or unbalanced countershaft induces cyclical vibration, especially noticeable at cruising speeds, indicating imminent failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.108.028 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Overall Length | ~485 mm |
| Diameter (bearing journals) | 55 mm / 60 mm |
| Weight | ~8.2 kg |
| Spline Count | 14-tooth involute |
| OEM Reference | ZF 4616.108.028 |
| Hardness | HRC 58–62 (case depth 0.8–1.2 mm) |
Compatibility
This countershaft is engineered for the ZF WG 65 series, but its design principles extend to several heavy-duty off-road and industrial transmissions. Based on spline geometry and bearing spacing, the 4616.108.028 is compatible with ZF WG180, WG200, and WG250 models. It also fits select WG65 variants used in construction equipment and agricultural machinery. For proper alignment, always verify the condition of the 0636011118: HEXAGON SCREW and the 4616301304: HOUSING during installation. Additionally, the 4616301309: HOUSING must be inspected for wear to prevent premature countershaft failure.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101101 | TRANSMISSION HOUSING | Encloses and supports gear train assembly |
| 0636011118 | HEXAGON SCREW | Secures housing and bearing caps |
| 4616301304 | HOUSING | Intermediate support for countershaft bearings |
| 4616301309 | HOUSING | Rear housing section for output shaft |
| 0630361069 | SEALING CAP | Prevents oil leakage from shaft openings |
| 0636011038 | HEXAGON SCREW | Fastens clutch housing to main case |
| 0636016015 | HEXAGON SCREW | High-tensile bolt for bearing retainer |
| 0631306085 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0634313118 | O-RING | Seals oil passages between housings |
| 0636304019 | SCREW PLUG | Closes drain or inspection ports |
