ZF 4699.801.091 GK10 | OEM Genuine Part

Overview

The ZF 4699.801.091 GK10 is a genuine OEM gearset assembly engineered for the high-torque transfer case and main drive sections of heavy-duty construction machinery transmissions. This SKU, 4699.801.091, functions as the primary reduction gear cluster, managing the critical speed-to-torque conversion between the input shaft and the output differential. It sits directly within the main housing bore, meshing with the countershaft to deliver reliable power flow under extreme load conditions. For proper sealing and alignment, this gearset is typically installed alongside the 4699101081 HOUSING and the 0501329881 HOUSING COVER to maintain structural integrity.

Symptoms of Failure

• Whining or howling noise during acceleration: Worn gear teeth on the 4699.801.091 produce a distinct high-pitched whine that increases with engine RPM, often mistaken for bearing noise.
• Intermittent gear slipping under load: As the GK10 cluster loses tooth profile, the transmission may momentarily lose drive power when climbing grades or moving heavy earth.
• Metallic debris in transmission oil: Pitting or spalling on the gear flanks sheds fine metal particles into the lubricant, which can be detected during routine oil changes.
• Oil seepage around the housing joint: Excessive vibration from a failing gearset can loosen the 0634306309 O-RING seal, leading to visible leaks at the mating surface.

Technical Specifications

Compatibility

This genuine GK10 gearset is a direct replacement for ZF WG180, WG200, and WG210 series transmissions commonly found in wheel loaders, graders, and dump trucks. It also fits select variants of the ZF 4WG-180 and 4WG-200 power shift transmissions. The part is designed to work with the 0637885612 BREATHER to equalize internal pressure and prevent moisture ingress. Always verify the housing bore condition before installation, as the gearset requires precise axial play tolerance.

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