Overview
The ZF 4699.808.055 GK16 is a critical OEM genuine gear assembly designed for heavy-duty construction machinery transmissions. This part functions as a primary speed-reduction component within the planetary gear set, managing torque distribution between the input shaft and the output shaft. The SKU 4699.808.055 is engineered to withstand extreme loads in excavators, wheel loaders, and graders. When installed alongside the 4699008051: GK16, it ensures synchronized gear engagement and minimal backlash. This component sits directly in the main drive train, connecting the 4699102193: INPUT assembly to the 4699103131: OUTPUT section, making it essential for smooth power flow under high hydraulic pressure.
Symptoms of Failure
- Erratic gear engagement under load: When the 4699.808.055 wears, operators notice delayed or harsh shifting during heavy digging or lifting operations.
- Metallic grinding noise from the transmission housing: Worn teeth produce a distinct whine or grind, particularly when decelerating, indicating imminent failure of the gear set.
- Oil contamination with bronze or steel particles: Debris in the transmission fluid signals that the GK16 gear surfaces are spalling, often accompanied by a burnt smell.
- Reduced torque output at the wheels: The machine struggles to maintain speed on inclines, a direct result of slipping between the gear and the 4699101181: HOUSING.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4699.808.055 |
| Type | GK16 Gear Set |
| Material | Case-hardened alloy steel (20MnCr5) |
| Weight | 2.85 kg (6.28 lbs) |
| Outer Diameter | 145 mm |
| Tooth Count | 16 teeth (helical) |
| OEM Reference | ZF 4699.808.055 |
| Operating Temperature Range | -20°C to +120°C |
Compatibility
This genuine ZF part is primarily compatible with the WG180 and WG200 series transmissions found in construction machinery. It also fits select models of the ZF 4WG-200, 5WG-200, and 6WG-180 power shift transmissions. The 4699.808.055 GK16 is used in OEM applications for brands such as Liebherr, Caterpillar, and Volvo CE. Always verify the housing configuration, as the gear interfaces with the 4699101181: HOUSING and the 4699102193: INPUT shaft. For complete rebuilds, pair this part with the 4699103131: OUTPUT assembly to ensure proper axial clearance.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699008051 | GK16 | Primary gear reduction |
| 4699101181 | HOUSING | Encloses gear set |
| 4699102193 | INPUT | Transmits engine torque |
| 4699103131 | OUTPUT | Delivers power to axles |
| 4699105132 | HOUSING TOP PART | Upper housing cover |
| 4699301191 | HOUSING | Lower housing section |
| 4699301041 | COVER | Seals the housing |
| 0634303936 | O-RING | Prevents fluid leaks |
| 0630513203 | SNAP RING | Secures gear on shaft |
| 0750110302 | SHAFT SEAL | Prevents oil seepage |
