ZF 4699.023.006 GP21 | OEM Genuine Part

Overview

The ZF 4699.023.006 GP21 is a critical OEM genuine component engineered for the high-stress environment of construction machinery transmissions. This part functions as a precision-machined guide or bushing element within the clutch pack assembly, ensuring correct alignment and smooth axial movement of the shifting components. Located deep inside the transmission housing, the 4699.023.006 directly supports the rotating shafts and planetary gear sets, minimizing vibration and maintaining hydraulic pressure integrity. The SKU 4699.023.006 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in heavy-duty applications.

Symptoms of Failure

• Delayed or harsh gear engagement: When the 4699.023.006 wears, the clutch pack alignment shifts, causing noticeable hesitation or a jarring “clunk” when shifting between forward and reverse gears.
• Low hydraulic pressure and slipping: A worn GP21 component can allow internal leakage, leading to a drop in clutch apply pressure. This manifests as transmission slipping under load, especially during uphill travel or heavy digging.
• Metallic debris in transmission fluid: As the part degrades, fine metal particles from the bushing surface contaminate the oil. You may find glitter-like shavings on the magnetic drain plug or in the filter.
• Abnormal whining or grinding noise: Excessive clearance from a failed 4699.023.006 permits metal-on-metal contact between the GEAR SHAFT and the housing, producing a distinct high-pitched whine that worsens with speed.

Technical Specifications

Compatibility

This OEM genuine part is designed for integration into ZF’s heavy-duty powershift transmission series. It is a direct fit for the WG180 and WG200 models commonly found in wheel loaders, dozers, and graders. The 4699.023.006 also appears in select WG150 and WG250 variants where the GP21 bushing is used in the forward clutch drum. Always verify the part number against your transmission’s serial plate. For a complete rebuild, this component is typically installed alongside the BASIC PARTS kit and the HOUSING assembly. The PLANET CARRIER also interfaces directly with this guide plate.

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