ZF 4699.804.070 GK25 | OEM Genuine Part

Overview

The ZF 4699.804.070 GK25 is a precision-engineered gear component designed for heavy-duty construction machinery transmissions. This OEM genuine part, identified by SKU 4699.804.070, functions as a critical intermediate gear within the planetary gearset assembly, ensuring smooth torque transfer and load distribution across the transmission system. It sits directly within the main housing, meshing with adjacent shafts to maintain consistent power flow under extreme operating conditions. The GK25 designation indicates its specific tooth profile and heat-treatment specifications, making it essential for maintaining factory-level performance in ZF drivelines.

Symptoms of Failure

When the ZF 4699.804.070 gear wears out, operators typically notice three distinct failure modes. First, intermittent gear slipping under load occurs, particularly during uphill operation or when carrying maximum payload, as worn teeth lose their engagement tolerance. Second, metallic grinding noises from the transmission housing become audible during gear changes, indicating surface fatigue or pitting on the gear flanks. Third, unexpected transmission overheating may develop due to increased friction from degraded gear surfaces, often accompanied by darkening transmission fluid. For long-tail search queries like “construction machinery transmission gear noise” or “ZF GK25 slipping symptoms,” these indicators help technicians diagnose the issue before catastrophic failure.

Technical Specifications

Compatibility

This gear is primarily compatible with ZF WG180, WG200, and WG210 series transmissions commonly found in wheel loaders, excavators, and telehandlers. It also fits select models in the ZF Ecomat 4HP and 5HP ranges used in medium-duty construction vehicles. The 4699.804.070 GK25 interfaces directly with the 4699101043 HOUSING and the 4699301106 HOUSING, which enclose the gear cluster. Additionally, it requires proper sealing via the 4699301015 HOUSING COVER and the 4699301085 COVER to maintain lubrication integrity. Always verify your transmission model number before ordering, as variations exist between early and late production runs.

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