ZF 4699.801.074 GK10 | OEM Genuine Part

Overview

The ZF 4699.801.074 GK10 is a precision-engineered gear set assembly designed for heavy-duty construction machinery transmissions. This OEM genuine part functions as a primary reduction gear cluster within the planetary gear train, directly transferring torque from the input shaft to the intermediate shaft. The SKU 4699.801.074 is critical for maintaining proper gear ratios under high load conditions in wheel loaders and dozers. It interfaces seamlessly with the 4699101081 HOUSING and the 0501329881 HOUSING COVER to form a sealed, lubricated chamber that ensures consistent power delivery.

Symptoms of Failure

• Whining or grinding noise during gear engagement: Worn teeth on the 4699.801.074 produce a high-pitched metallic sound, especially under load, indicating imminent gear failure.
• Intermittent gear slipping under heavy torque: When the gear set loses its hardened surface, the transmission may momentarily lose drive power during acceleration or climbing.
• Metallic debris in transmission oil: Flaking or pitting on the gear teeth generates visible metal particles in the oil filter or drain plug, often accompanied by a burnt odor.
• Vibration through the driveline at specific speeds: Uneven wear on the gear cluster causes harmonic vibrations that are felt in the operator cab or chassis.

Technical Specifications

Compatibility

This GK10 gear set is engineered for ZF WG series powershift transmissions commonly used in construction machinery. It is a direct replacement for the following models:

• ZF WG180 (all variants)
• ZF WG200 (early and late production)
• ZF 4WG200 (with planetary reduction)
• ZF 6WG200 (heavy-duty versions)

During installation, always replace the 0634306309 O-RING and inspect the 0637885612 BREATHER for clogging to prevent contamination. The gear set is not backward-compatible with WG150 or WG160 series without adapter modifications.

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