Overview
The ZF 4616.308.030 GEAR is a precision-machined internal component engineered specifically for the WG 65 Series transmission family. This gear plays a critical role in torque transfer and speed regulation within the planetary gearset, directly influencing shift quality and driveline efficiency. As an OEM genuine part, the 4616.308.030 ensures exact fitment and metallurgical integrity, reducing the risk of premature wear. This gear interfaces directly with the 4616105413: OUTPUT shaft and the 4616203017: OUTPUT FLANGE, forming a robust power transfer assembly. The SKU 4616.308.030 is laser-etched for traceability and meets ZF’s strict OEM tolerances.
Symptoms of Failure
- Whining or grinding noise during gear engagement: Worn gear teeth on the 4616.308.030 produce a distinct metallic whine under load, often mistaken for bearing failure. This symptom worsens during cold starts.
- Intermittent gear slipping under heavy torque: A damaged gear surface can cause the transmission to momentarily lose power delivery, especially during uphill climbs or towing operations.
- Metal particles in transmission fluid: Flaking or pitting on the gear’s contact face introduces ferrous debris into the oil, which can be detected during routine fluid analysis or filter inspection.
- Delayed or harsh shifting between forward gears: When the 4616.308.030 loses its tooth profile accuracy, hydraulic pressure modulation becomes erratic, leading to noticeable shift shock.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4616.308.030 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 1.85 kg (4.08 lbs) |
| Outer Diameter | 142.5 mm |
| Tooth Count | 37 |
| OEM Reference | ZF 4616.308.030 |
| Hardness | 58-62 HRC (case depth 0.8 mm) |
Compatibility
This gear is a direct replacement for the WG 65 Series, which includes the following ZF transmission models: WG65, WG80, WG100, WG120, WG150, WG180, and WG200. The 4616.308.030 is also used in select ZF off-highway and marine transmissions that share the WG planetary architecture. Always verify the gear’s tooth profile and spline count against your existing unit before installation. The gear mounts inside the 4616101117: TRANSMISSION HOUSING and is secured using 0636011038: HEXAGON SCREW fasteners.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105413 | OUTPUT | Transfers torque from gearset to driveline |
| 4616203017 | OUTPUT FLANGE | Connects output shaft to driveshaft yoke |
| 4616101117 | TRANSMISSION HOUSING | Encloses and supports gear assembly |
| 0636011038 | HEXAGON SCREW | Secures gear to shaft hub |
| 0636016015 | HEXAGON SCREW | Fastens housing cover |
| 0631306085 | CYLINDRICAL PIN | Aligns gear and shaft during assembly |
| 0634313118 | O-RING | Seals gear hub oil passage |
| 0732611049 | FILTER INSERT | Captures gear wear debris from fluid |
| 0634303718 | O-RING | Seals output flange interface |
| 0636610082 | STUD | Mounts housing to bell housing |
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