ZF 4699.823.054 GP21 | OEM Genuine Part

Overview

The ZF 4699.823.054 GP21 is a critical OEM genuine component engineered for high-stress planetary gear assemblies within heavy-duty construction machinery transmissions. This part, identified by SKU 4699.823.054, functions as a precision-machined carrier and gear set that manages torque distribution across multiple pinions. It sits directly within the main drive housing of the transmission, interfacing with the HOUSING to ensure concentric rotation and load sharing. When installed alongside the BASIC PARTS kit, this GP21 assembly provides the foundational mechanical interface for smooth power transfer under extreme loads.

Symptoms of Failure

• Erratic gear engagement or slipping under load: Worn planetary gear teeth or carrier bearing surfaces cause intermittent power loss, especially during uphill grading or heavy bucket loading.
• Metallic grinding noise from the transmission housing: Damaged pinion gears or a fatigued carrier produce a distinct high-pitched whine or grinding sound that worsens with throttle application.
• Contaminated transmission fluid with metallic debris: Spalling on the gear shaft or carrier pockets releases fine steel particles into the oil, visible during routine drain inspections.
• Vibration through the chassis during gear shifts: A worn GP21 assembly creates axial play that transmits noticeable shuddering through the driveline when transitioning between forward and reverse.

Technical Specifications

Compatibility

This GP21 planetary carrier assembly is designed for ZF WG-series transmissions commonly used in wheel loaders, graders, and compactors. It is a direct fit for the WG180 and WG200 transmission models, as well as select variants of the WG160 and WG210 series. The part integrates with the GEAR SHAFT and PLANET CARRIER to form the complete planetary set. Always verify your transmission serial number against the OEM parts catalog before ordering.

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