ZF 4699.825.226 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.226 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 4699.825.226, functions as a primary power transfer gear within the main drive assembly, ensuring precise rotational synchronization between the input shaft and the output differential. It is machined from case-hardened alloy steel to withstand the extreme shock loads common in heavy earthmoving equipment. When paired with the 4699025164: GP25, this gear set forms the core of the reduction stage, directly influencing machine tractive effort and operational efficiency.

Symptoms of Failure

When the 4699.825.226 GP25 begins to wear, operators typically notice three distinct failure indicators. First, a whining or howling noise from the transmission housing during acceleration under load is common, indicating gear tooth surface pitting or spalling. Second, intermittent gear slipping in forward gears occurs as the gear profile degrades, preventing full engagement with the mating planetary pinion. Third, metallic debris in the transmission oil filter is a definitive sign of advanced wear, often accompanied by a gradual loss of hydraulic pressure. These symptoms directly impact machine productivity and require immediate replacement to prevent cascading damage to the 4699101154: HOUSING and adjacent bearings.

Technical Specifications

Compatibility

This GP25 gear is specifically designed for ZF WG series powershift transmissions used in construction machinery. It is a direct fit for the WG180, WG200, and WG220 transmission models. The part also integrates seamlessly into the 4WG-200 and 5WG-180 variants commonly found in wheel loaders and graders. For proper installation, ensure the 4699102106: INPUT shaft is free of wear, and the 4699103122: OUTPUT flange is correctly torqued to specification.

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