Overview
The ZF 4699.808.059 GK16 is a precision-engineered gear cluster assembly designed for heavy-duty construction machinery transmissions. This OEM genuine part functions as a critical power transfer component within the planetary gear set, converting input torque into controlled output speed for demanding off-highway applications. The SKU 4699.808.059 sits directly in the main drive train of ZF’s modular transmission systems, ensuring synchronized gear engagement under extreme loads. When paired with the 4699008053: GK16 companion unit, this assembly provides the mechanical foundation for reliable operation in wheel loaders, graders, and dump trucks.
Symptoms of Failure
- Erratic gear engagement under load: Worn teeth on the 4699.808.059 cause delayed or harsh shifting when the machine is under heavy torque, often accompanied by a grinding noise.
- Metallic debris in transmission fluid: As the gear cluster degrades, fine metal particles contaminate the oil, visible during routine fluid changes or filter inspections.
- Progressive power loss in forward gears: The transmission slips or fails to maintain speed on inclines, indicating the GK16 assembly can no longer hold proper gear mesh.
- Vibration at specific RPM ranges: Imbalanced gear wear creates resonant vibrations that worsen as the part approaches complete failure, detectable through the chassis or control levers.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.808.059 |
| Assembly Type | GK16 Gear Cluster |
| Material | Case-hardened alloy steel (20MnCr5) |
| Weight | 4.8 kg (10.6 lbs) |
| Outer Diameter | 145 mm |
| Overall Length | 112 mm |
| Spline Count | 14 internal / 22 external |
| OEM Reference | ZF 4699.808.059 |
| Hardness | 58-62 HRC (Rockwell C) |
Compatibility
This GK16 gear cluster is engineered for ZF’s WG series powershift transmissions commonly used in construction machinery. It is a direct fit for the WG180, WG200, and WG210 models, as well as select variants of the WG150 and WG250 series. The 4699.808.059 interfaces with the 4699101181: HOUSING for alignment and the 4699102195: INPUT shaft to receive engine torque. For output side integration, the 4699103131: OUTPUT component completes the driveline connection. Always verify your transmission serial number against ZF’s compatibility charts before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699008053 | GK16 | Companion gear cluster for dual-stage reduction |
| 4699101181 | HOUSING | Main gear carrier housing for GK16 assembly |
| 4699102195 | INPUT | Input shaft with spline coupling |
| 4699103131 | OUTPUT | Output flange for final drive connection |
| 4699105130 | HOUSING TOP PART | Upper housing section for seal retention |
| 4699301191 | HOUSING | Alternate housing variant for WG200 series |
| 4699301041 | COVER | Access cover for gear inspection |
| 0634303936 | O-RING | Hydraulic seal for housing interface |
| 0630513203 | SNAP RING | Retaining ring for gear axial positioning |
| 0750110302 | SHAFT SEAL | Rotary shaft seal for input/output points |
