Overview
The ZF 4699.801.102 GK10 is a precision-machined gear set assembly designed for the transfer case and drop box sections of heavy-duty construction machinery transmissions. This OEM genuine part, identified by SKU 4699.801.102, sits directly between the input shaft and the output drive train, managing torque distribution and rotational speed reduction. It is a critical component within the GK10 gear cluster, ensuring smooth power delivery from the engine to the wheels or tracks under extreme load conditions. When replacing this unit, it is common to also inspect the 4699101095 HOUSING for cracks or wear, as the gear set seats directly within it.
Symptoms of Failure
- Whining or grinding noise during deceleration: A worn 4699.801.102 gear set produces a distinct high-pitched whine when the vehicle is coasting or decelerating, indicating tooth surface pitting or backlash issues.
- Intermittent gear slipping under load: As the gear teeth wear unevenly, operators may experience sudden loss of drive power when climbing grades or pushing heavy loads, often misdiagnosed as clutch failure.
- Metallic debris in transmission fluid: Flakes or silver particles found during routine oil changes point directly to spalling on the GK10 gear teeth, requiring immediate replacement to prevent catastrophic failure of the 0501329881 HOUSING COVER.
- Oil seepage at the gear housing interface: Excessive gear play can distort the sealing surfaces, causing fluid to leak past the 0634306309 O-RING and contaminating the 0637885612 BREATHER valve.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.801.102 |
| Designation | GK10 Gear Set Assembly |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Weight | 4.2 kg (9.26 lbs) |
| Outer Diameter | 168 mm |
| Shaft Bore | 45 mm (splined) |
| Heat Treatment | Carburized & tempered to HRC 58-62 |
| OEM Reference | ZF 4699.801.102 |
Compatibility
This genuine ZF 4699.801.102 GK10 gear set is engineered for use in the following ZF transmission models commonly found in wheel loaders, graders, and telehandlers:
- ZF WG180 series (all variants)
- ZF WG200 series (including WG200C and WG200E)
- ZF 4WG-180 and 4WG-200 transfer cases
- ZF Ergopower 6-speed models with GK10 drop box
Always verify the gear ratio and spline count against your existing assembly. For complete driveline restoration, consider pairing this gear set with the 4699102158 INPUT shaft and the 4699103063 OUTPUT flange.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101095 | HOUSING | Encloses and supports the gear set assembly |
| 0501329881 | HOUSING COVER | Seals the housing and retains bearing preload |
| 0634306309 | O-RING | Prevents oil leakage between housing and cover |
| 0637885612 | BREATHER | Equalizes internal pressure and vents moisture |
| 0769100082 | TYPE PLATE | Identification tag for transmission model |
| 4699001121 | GK10 | Complete gear cluster assembly (alternative variant) |
| 4699102158 | INPUT | Input shaft that drives the gear set |
| 4699103063 | OUTPUT | Output flange connecting to the driveline |
| 4699105042 | TURNTABLE BEARING | Rotary bearing for swing drive applications |
| 4699302299 | DRIVE PINION | Pinion gear meshing with the GK10 set |
