ZF 4699.801.225 GK10 | OEM Genuine Part

Overview

The ZF 4699.801.225 GK10 is a critical shift mechanism component engineered for heavy-duty construction machinery transmissions. This OEM genuine part functions as the primary actuation interface within the gear cluster assembly, converting hydraulic pilot pressure into precise mechanical movement for clutch pack engagement. The SKU 4699.801.225 is specifically designed to interface with the main shaft and the 4699001203: GK10 assembly, ensuring synchronized gear changes under extreme torque loads. Located within the upper valve body section of the transmission, this part directly controls the flow of transmission fluid to the rotating clutches, making it indispensable for maintaining driveline integrity in wheel loaders and graders.

Symptoms of Failure

• Delayed or harsh engagement when shifting from neutral to forward: Worn internal bores in the 4699.801.225 cause pressure bleed-off, resulting in a noticeable lag before the machine moves.
• Intermittent gear slipping under load: As the part loses its sealing capability, the transmission may momentarily lose power transfer when climbing grades or pushing material.
• External oil seepage around the shift tower: Cracks in the valve body housing or degraded O-rings allow ATF to weep, leaving visible residue on the transmission casing.
• Erratic shift patterns or failure to engage a specific range: Internal spool sticking due to contamination prevents the GK10 from completing its full stroke, leaving the operator with a false neutral.

Technical Specifications

Compatibility

This OEM genuine part is primarily compatible with ZF WG180, WG200, and WG310 series powershift transmissions used in construction machinery. It also fits select variants of the ZF 4WG-200 and 6WG-310 torque converter transmissions. The 4699.801.225 is a direct replacement for the shift valve found in the 4699101125: HOUSING assembly. For complete overhaul, always inspect the 4699102156: INPUT shaft and the 4699103016: OUTPUT flange for wear, as these components share the same hydraulic circuit.

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