Overview
The ZF 4616.308.108 GEAR is a precision-machined component engineered specifically for the WG 65 Series transmission family. This OEM genuine part functions as a critical load-bearing gear within the planetary gearset, facilitating smooth torque transfer and speed regulation under heavy-duty operating conditions. The SKU 4616.308.108 is designed to mesh precisely with adjacent shafts and clutches, ensuring minimal backlash and consistent power delivery. When installed alongside the 4616105402: OUTPUT and the 4005303005: OUTPUT FLANGE, this gear forms the core of the driveline assembly, directly influencing overall transmission efficiency and durability.
Symptoms of Failure
- Whining or grinding noise during gear engagement: A worn 4616.308.108 gear often produces a high-pitched whine or metallic grinding sound, particularly under load or during acceleration. This indicates tooth surface degradation or pitting.
- Intermittent gear slipping under torque: When the gear teeth lose their hardened profile, the transmission may momentarily slip out of the intended ratio, causing a sudden loss of power to the wheels.
- Metal particles in transmission fluid: Advanced wear of this gear sheds microscopic steel fragments into the oil. Inspecting the fluid for a metallic sheen or sludge is a reliable diagnostic step.
- Vibration at specific road speeds: Uneven tooth wear creates imbalance, leading to noticeable driveline vibration that intensifies as the gear rotates faster.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4616.308.108 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 1.85 kg (approx.) |
| Outside Diameter | 108 mm |
| Tooth Count | 32 teeth (helical) |
| OEM Reference | ZF 4616.308.108 |
| Surface Hardness | 58-62 HRC |
Compatibility
This gear is a direct fit for the ZF WG 65 Series, including the WG65, WG80, and WG100 models. It also serves as a replacement in certain WG120 and WG150 transmissions where the planetary gearset shares identical tooth geometry. For proper installation, ensure the 4616101119: TRANSMISSION HOUSING is free of cracks and the 0636011038: HEXAGON SCREW is torqued to factory specifications. Always verify the gear’s spline count against your existing unit before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105402 | OUTPUT | Transfers rotational force from gearset to driveshaft |
| 4005303005 | OUTPUT FLANGE | Connects output shaft to universal joint |
| 4616101119 | TRANSMISSION HOUSING | Encloses and supports gear assembly |
| 0636011038 | HEXAGON SCREW | Secures housing and flange components |
| 0636011118 | HEXAGON SCREW | Fastens gear retention plate |
| 0636016015 | HEXAGON SCREW | Mounts bearing retainer |
| 0631306085 | CYLINDRICAL PIN | Aligns gear to shaft |
| 0634313118 | O-RING | Seals fluid passages |
| 0636304019 | SCREW PLUG | Closes inspection ports |
| 0634801152 | SEALING RING | Prevents oil leaks at joints |
Authorized ZF Distributor
We are a certified supplier of genuine ZF components.
