ZF 4699.825.243 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.243 GP25 is a critical OEM genuine gearset component engineered for heavy-duty construction machinery transmissions. This part functions as a planetary gear assembly within the transmission’s power flow path, directly managing torque distribution and rotational speed between the input shaft and output shaft. Specifically, the GP25 gearset engages with the clutch pack to facilitate smooth gear ratio changes under high load conditions. The SKU 4699.825.243 is precision-machined to OEM tolerances, ensuring minimal backlash and optimal power transfer in ZF’s modular transmission systems. When installed alongside the 4699025163 GP25, this assembly provides redundant load capacity for extreme operational cycles.

Symptoms of Failure

When the ZF 4699.825.243 GP25 wears out, operators often report “construction machinery transmission gear slipping under load”—a distinct loss of torque during excavation or grading. Another common failure sign is “ZF transmission whining noise during shifting”, caused by pitting on the gear teeth surfaces. You may also notice “delayed engagement when switching from forward to reverse”, as worn planetary gears fail to synchronize with the clutch pack. Finally, “metallic debris in transmission fluid” indicates advanced wear of the GP25 gearset, requiring immediate replacement to prevent cascading damage to the 4699101153 HOUSING.

Technical Specifications

Compatibility

This GP25 gearset is designed for ZF’s WG-series powershift transmissions commonly used in wheel loaders, dozers, and graders. It directly fits the WG180, WG200, and WG250 models, where it interfaces with the 4699102106 INPUT shaft and the 4699103122 OUTPUT flange. The part also supports the ERGOPOWER series (e.g., 6WG200) used in heavy construction machinery. Always verify the transmission serial number before installation, as minor spline variations exist between early and late production runs.

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