Overview
The ZF 4699.825.230 GP25 is a critical OEM genuine gear component engineered for the high-torque planetary sections of ZF construction machinery transmissions. This part, identified by SKU 4699.825.230, functions as a precision-ground spur gear within the intermediate shaft assembly, directly managing power distribution between the input clutch pack and the output planetary set. Its hardened alloy steel construction ensures minimal backlash and sustained load capacity under severe duty cycles. When paired with the 4699025170 GP25, this component forms a matched gear set essential for synchronized gear engagement in wheel loaders and graders.
Symptoms of Failure
- Whining or howling noise during acceleration: Worn gear teeth on the 4699.825.230 produce a distinct high-pitched whine that intensifies under load, often misdiagnosed as bearing noise.
- Intermittent gear slippage in 2nd and 3rd range: As tooth profiles degrade, the transmission fails to hold torque, causing momentary RPM flare without corresponding speed increase.
- Metallic debris in transmission fluid: Flaking or pitting on the gear face contaminates the hydraulic circuit, leading to valve body sticking and clutch pack damage.
- Hard shifting or delayed engagement: Excessive wear alters the gear mesh clearance, forcing the shift solenoids to compensate with higher pressure, resulting in harsh or delayed shifts.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4699.825.230 |
| Designation | GP25 (Gear, Planetary) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Tooth Count | 25 teeth (estimated) |
| Module | 4.5 mm (estimated) |
| Weight | 1.85 kg (4.08 lbs) |
| OEM Reference | ZF 4699.825.230 |
| Surface Hardness | 58-62 HRC |
Compatibility
This gear is a direct replacement for the intermediate shaft position in ZF WG180, WG200, and WG210 series transmissions commonly installed in Volvo, Caterpillar, and Liebherr wheel loaders. It also fits select variants of the ZF 4WG-200 and 6WG-200 powershift models. The 4699.825.230 interfaces directly with the 4699101154 HOUSING to maintain proper gear alignment, while the 4699102130 INPUT shaft drives this gear and the 4699103122 OUTPUT shaft receives its torque. Always inspect the mating gear (4699025170) simultaneously to prevent accelerated wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699025170 | GP25 | Mating gear for 4699.825.230; forms the planetary gear set |
| 4699101154 | HOUSING | Transmission housing section that encloses the gear cluster |
| 4699102130 | INPUT | Input shaft assembly that drives the gear train |
| 4699103122 | OUTPUT | Output shaft assembly receiving torque from the gear set |
| 4699109111 | BRAKE PARTS | Brake components for the planetary gear system |
| 4699301249 | HOUSING | Secondary housing section for gear support |
| 4699309121 | HOUSING COVER | Cover plate sealing the gear compartment |
| 0636101411 | CAP SCREW | Fastener for securing housing components |
| 0631302072 | CYLINDRICAL PIN | Alignment pin for gear assembly positioning |
| 0636302013 | SCREW PLUG | Sealing plug for hydraulic ports in the gear area |
