ZF 4699.817.022 GK40 | OEM Genuine Part

Overview

The ZF 4699.817.022 GK40 is a precision-engineered gear set component designed for the planetary gear train within heavy-duty ZF transmissions. This OEM genuine part, identified by SKU 4699.817.022, functions as a critical torque-transfer element, ensuring smooth power distribution from the engine to the output shaft in construction machinery. It sits directly within the main drive assembly, working in conjunction with the 4699100080 BASIC GEARBOX to maintain proper gear mesh and load capacity. Without this component, the transmission cannot sustain the high torque demands of earthmoving equipment.

Symptoms of Failure

• Intermittent gear slipping under load: When the 4699.817.022 wears, the teeth lose their hardened profile, causing the transmission to momentarily lose drive when climbing grades or hauling heavy loads.
• Metallic grinding noise during shifting: A distinct whine or grinding sound, particularly in lower gears, indicates excessive backlash or pitting on the gear faces.
• Contaminated transmission fluid with metal particles: Worn gear surfaces shed fine metallic debris into the oil, often visible during routine fluid changes or when inspecting the magnetic drain plug.
• Delayed engagement or harsh shifting: As the gear geometry degrades, hydraulic pressure cannot compensate for the increased clearance, leading to jerky or delayed clutch pack engagement.

Technical Specifications

Compatibility

This GK40 gear set is primarily used in ZF WG series transmissions found in wheel loaders, graders, and dump trucks. It is compatible with the following ZF transmission models: WG180, WG200, WG210, and WG250. Always verify the tooth count and spline configuration against your existing assembly. For proper installation, pair this gear with a new 0634309122 SHAFT SEAL to prevent fluid ingress, and use the 0634801038 SEALING RING on the output flange. Axial play must be adjusted using the 0630000091 SHIM RING to ensure correct gear mesh depth.

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