ZF 4699.023.008 GP21 | OEM Genuine Part

Overview

The ZF 4699.023.008 GP21 is a genuine OEM clutch pack assembly engineered for the demanding environment of construction machinery transmissions. This critical component sits within the planetary gear set, managing torque transfer and gear engagement under heavy loads. The SKU 4699.023.008 functions as a complete GP21 unit, integrating friction discs and steel plates to ensure precise hydraulic actuation. When installed alongside the 4699100019 BASIC PARTS kit, it forms the core of the shifting mechanism, directly influencing driveline response and power delivery in wheel loaders and graders.

Symptoms of Failure

• Delayed or harsh gear engagement: Worn friction material in the GP21 causes hesitation or abrupt shifts, especially when transitioning from neutral to forward.
• Transmission overheating under load: Slipping clutch packs generate excessive heat, often accompanied by burnt oil odor and elevated temperature warnings.
• Intermittent loss of drive in specific gears: Internal wear on the 4699300139 HOUSING or the GP21 hub can lead to partial pressure loss, causing the machine to stall on inclines.
• Oil contamination with metallic debris: Degraded clutch plates shed particles that circulate through the system, accelerating wear on the 4699300156 GEAR SHAFT and adjacent planetary components.

Technical Specifications

Compatibility

This GP21 clutch pack is designed for ZF WG series transmissions commonly found in construction machinery. It is a direct fit for the WG180 and WG200 models, which power articulated dump trucks, wheel loaders, and crawler dozers. The 4699.023.008 also integrates with the WG150 series when used with the correct 4699300127 PLANET CARRIER assembly. Always verify the spline count and stack height against your transmission’s service manual before installation.

Related Components