ZF 4699.298.021 REPAIR KIT GK25II | OEM Genuine Part

Overview

The ZF 4699.298.021 REPAIR KIT GK25II is a critical OEM genuine service assembly designed to restore the sealing and shifting integrity of the GK25 II gearbox used in heavy construction machinery. This kit sits directly within the transmission’s hydraulic control unit and clutch pack housing, providing all necessary gaskets, seals, and wear components to eliminate internal leakage. The SKU 4699.298.021 is engineered to match original factory tolerances, ensuring that the 4699004105: GK25 II unit maintains consistent oil pressure and gear engagement under extreme load conditions.

Symptoms of Failure

• Oil leaks around the transmission housing: When the seals in the 4699.298.021 kit degrade, hydraulic fluid seeps past the 4699101025: HOUSING interface, leaving visible puddles under the equipment.
• Gear slipping under load: Worn internal O-rings cause pressure loss in the clutch circuits, leading to delayed or incomplete engagement when the machine is under heavy torque.
• Erratic shifting or harsh engagement: Contaminated or fatigued sealing elements within the repair kit disrupt the smooth flow of oil to the 4699102063: INPUT and 4699103062: OUTPUT shafts, causing jarring shifts.
• Reduced hydraulic pressure readings: Internal bypassing of fluid due to failed seals in the GK25 II repair kit results in lower-than-specified pressure at the test ports.

Technical Specifications

Compatibility

This repair kit is specifically engineered for the ZF GK25 II transmission series, which is commonly installed in wheel loaders, telehandlers, and mobile cranes. Based on the seal geometry and hydraulic circuit design, the 4699.298.021 is compatible with the following ZF transmission models: WG180, WG200, WG210, and WG250. It also fits select variants of the 4WG-200 and 4WG-210 series where the GK25 II gearbox is used as the power take-off unit. Always verify your transmission serial number before installation.

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