ZF 4699.823.062 GP21 | OEM Genuine Part

Overview

The ZF 4699.823.062 GP21 is a precision-engineered genuine OEM component designed for the high-stress planetary gear sets within ZF heavy-duty transmissions. This part functions as a critical interface element, ensuring proper alignment and load distribution between the sun gear and planetary carriers. Specifically, the GP21 sits within the forward clutch pack assembly of WG series transmissions, where it manages torque transfer during gear engagement. The SKU 4699.823.062 is manufactured to ZF’s original tolerances, guaranteeing a direct fit without modification. When paired with a PLANET CARRIER and GEAR SHAFT, this part forms the core of the transmission’s power flow path. Operators in construction machinery applications rely on this component to maintain consistent hydraulic pressure and prevent axial play in the rotating assembly.

Symptoms of Failure

• Intermittent gear slipping under load: When the GP21 wears, the planetary set loses clamping force, causing the transmission to momentarily lose power during uphill climbs or heavy digging operations.
• Metallic grinding noise from the bell housing: A worn 4699.823.062 allows the HOUSING to contact rotating gears, producing a distinct high-pitched whine that worsens with RPM.
• Delayed forward engagement: Hydraulic fluid bypasses the worn GP21 seal surface, requiring 2-3 seconds longer to engage Drive from Neutral, especially in cold weather.
• Visible metal particles in transmission fluid: Advanced wear of this part sheds fine steel debris into the oil pan, often mistaken for bearing failure during routine filter inspections.

Technical Specifications

Compatibility

This genuine GP21 component is engineered for ZF WG series transmissions commonly used in wheel loaders, excavators, and telehandlers. It is a direct replacement for the following transmission models:

• ZF WG180 (all variants including WG180-1, WG180-2)
• ZF WG200 (WG200-3, WG200-4)
• ZF WG210 (early production models)
• ZF 4WG-200 (4-speed versions)

Always verify the existing BASIC PARTS kit number before installation, as the GP21 works in conjunction with the HOUSING to maintain proper end-play tolerances. For 6-speed WG models, confirm the GEAR SHAFT length matches the 4699.823.062 stack height.

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