ZF 4699.825.136 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.136 GP25 is a critical OEM genuine gear component engineered for the high-torque planetary sections of ZF construction machinery transmissions. This part functions as a precision-ground pinion within the gearset cluster, directly influencing power distribution from the input shaft to the final drive. The SKU 4699.825.136 is specifically designed to mesh with the 4699025032: GP25 counterpart, ensuring synchronized rotation under heavy load. Located in the mid-transmission housing, this gear reduces rotational speed while multiplying torque, making it indispensable for loaders and graders operating in demanding environments.

Symptoms of Failure

When the ZF 4699.825.136 wears out, operators often notice intermittent gear slipping under load during uphill climbs or when reversing direction. A second common failure sign is metallic whining or grinding noises emanating from the transmission center section, particularly at low speeds. Third, contaminated transmission fluid with visible metal shavings on the dipstick or filter indicates advanced gear tooth degradation. Finally, erratic engagement of forward and reverse gears may occur as the worn pinion fails to maintain proper backlash with the mating 4699101070: HOUSING assembly.

Technical Specifications

Compatibility

This genuine ZF gear is primarily compatible with the WG180 and WG200 series transmissions found in wheel loaders and dozers. It also fits select WG160 and WG210 models where the GP25 cluster is specified. The part interfaces directly with the 4699102130: INPUT shaft and the 4699103104: OUTPUT planetary carrier. Always verify your transmission serial number against ZF parts catalogs before installation.

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