ZF 4699.823.086 GP21 | OEM Genuine Part

Overview

The ZF 4699.823.086 GP21 is a precision-engineered OEM genuine part designed for high-stress planetary gear sets within ZF construction machinery transmissions. This component, identified by SKU 4699.823.086, functions as a critical interface between the input shaft and the clutch pack assembly, ensuring smooth torque transfer under heavy loads. It sits directly within the transmission’s rotating drum, where it engages with the GEAR SHAFT to modulate gear engagement. Without this part, the transmission cannot maintain proper hydraulic pressure distribution, leading to operational instability in wheel loaders and graders.

Symptoms of Failure

• Delayed gear engagement or slipping under load: When the 4699.823.086 wears, the clutch pack fails to lock fully, causing hesitation when shifting from neutral to drive in construction equipment.
• Metallic grinding noises from the transmission housing: Worn splines on this part create audible chatter, particularly during low-speed maneuvering on job sites.
• Hydraulic fluid contamination with metallic debris: As the GP21 degrades, fine metal particles enter the oil circuit, often detected during routine filter inspections.
• Erratic shift patterns or transmission overheating: Incomplete clutch engagement generates excess friction, raising operating temperatures above 120°C in ZF WG-series units.

Technical Specifications

Compatibility

This OEM genuine part is specifically engineered for ZF WG180, WG200, and WG210 transmission models commonly found in Volvo, Liebherr, and Caterpillar construction machinery. It also fits select ZF 4WG-200 and 6WG-200 variants used in articulated dump trucks. The 4699.823.086 interfaces directly with the HOUSING and the PLANET CARRIER assembly. For complete rebuilds, pair this part with the BASIC PARTS kit to ensure all seals and bearings are renewed simultaneously.

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