Overview
The ZF 4699.008.042 GK16 is an OEM genuine component engineered for the demanding environment of construction machinery transmissions. This precision-machined part functions as a critical intermediary within the gear cluster assembly, ensuring proper torque distribution and rotational alignment under heavy load. Located in the upper valve body and clutch pack region, the SKU 4699.008.042 directly interfaces with the HOUSING to maintain hydraulic pressure integrity. Without this component, the transmission cannot sustain the necessary clamping force for gear engagement, leading to operational inefficiency in wheel loaders and graders.
Symptoms of Failure
When the ZF 4699.008.042 begins to degrade, operators often notice specific failure modes. Intermittent gear slippage under load is a primary indicator, particularly when the machine is climbing or digging. Another common symptom is erratic shift timing, where the transmission hesitates or harshly engages between forward and reverse. Metallic debris in the hydraulic oil filter frequently accompanies this failure, as the part’s hardened surface flakes off. Finally, loss of low-range torque during startup suggests the GK16 can no longer maintain its positional tolerance within the INPUT assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.008.042 |
| Designation | GK16 (Gear Kit 16) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Outer Diameter | 142 mm |
| Inner Bore Diameter | 65 mm |
| Overall Height | 48 mm |
| Weight | 1.85 kg |
| OEM Reference | ZF Friedrichshafen AG |
| Surface Treatment | Black oxide with phosphate coating |
Compatibility
This OEM genuine part is specifically designed for ZF WG series powershift transmissions commonly found in construction machinery. It is a direct fit for the WG180 and WG200 transmission models. Additionally, the 4699.008.042 is compatible with the WG160 and WG210 series when used in conjunction with the correct OUTPUT shaft configuration. For machines equipped with the HOUSING TOP PART, this part ensures proper sealing against hydraulic cross-leakage. Always verify the existing clutch pack stack height before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101107 | HOUSING | Encloses the gear train and directs oil flow |
| 4699102151 | INPUT | Transfers engine torque into the transmission |
| 4699103113 | OUTPUT | Delivers rotational force to the driveline |
| 4699105089 | HOUSING TOP PART | Seals the upper valve body chamber |
| 4699301191 | HOUSING | Alternate housing variant for WG200 |
| 4699301041 | COVER | Protects the clutch piston assembly |
| 0634303936 | O-RING | Prevents hydraulic fluid bypass |
| 0630513203 | SNAP RING | Retains the gear on the shaft |
| 0750110302 | SHAFT SEAL | Blocks external contamination ingress |
| 0630513073 | SNAP RING | Secures the bearing race in place |
