Overview
The ZF 4699.827.029 GP25 is a precision-engineered gear component designed for heavy-duty construction machinery transmissions. This OEM genuine part functions as a critical power transfer element within the planetary gear set, ensuring smooth torque distribution from the input shaft to the output assembly. The SKU 4699.827.029 is specifically manufactured to ZF’s original tolerances, making it a direct replacement for worn units in high-stress environments like wheel loaders, graders, and dozers. When paired with the 4699027011: GP25, this part maintains the gear ratio integrity essential for demanding operational cycles.
Symptoms of Failure
- Intermittent gear slipping under load – A worn 4699.827.029 GP25 often causes the transmission to momentarily lose drive power when climbing grades or lifting heavy loads, a common long-tail search query for “ZF transmission slipping under load.”
- Metallic grinding noises from the gear housing – Deteriorated gear teeth produce a distinct whining or grinding sound, especially during deceleration, indicating the need for immediate replacement.
- Oil contamination with metallic particles – As the GP25 wears, fine metal shavings appear in the transmission fluid, detectable during routine oil changes, signaling internal gear degradation.
- Delayed engagement or harsh shifting – A failing gear set disrupts hydraulic pressure timing, causing noticeable lag when shifting between forward and reverse.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4699.827.029 |
| Designation | GP25 (Gear Planetary) |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Outer Diameter | 185 mm (estimated) |
| Inner Diameter | 65 mm (estimated) |
| Thickness | 42 mm (estimated) |
| Weight | 3.8 kg (estimated) |
| OEM Reference | ZF 4699.827.029 |
Compatibility
This GP25 gear is primarily compatible with ZF WG180, WG200, and WG210 series transmissions commonly found in construction machinery. It also fits select models of the ZF 4WG-200 and 6WG-200 power shift transmissions used in articulated dump trucks and compactors. For complete assembly integrity, verify the 4699101099: HOUSING condition and inspect the 4699102099: INPUT shaft for wear. The 4699103045: OUTPUT component should also be checked for scoring when replacing this gear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699027011 | GP25 | Matching planetary gear for torque distribution |
| 4699101099 | HOUSING | Encloses and aligns the gear set |
| 4699102099 | INPUT | Transfers engine power into the transmission |
| 4699103045 | OUTPUT | Delivers rotational force to the driveline |
| 4699301177 | HOUSING | Secondary housing for auxiliary gear support |
| 4699301178 | HOUSING COVER | Seals the housing and retains lubrication |
| 0636102013 | CAP SCREW | Fastens housing components securely |
| 0631302072 | CYLINDRICAL PIN | Precise alignment of gear assembly |
| 0501319149 | SCREW PLUG | Seals oil passages in the housing |
| 0636302013 | SCREW PLUG | Drain or fill port sealing |
