ZF 4699.004.041 GK25LD | OEM Genuine Part

Overview

The ZF 4699.004.041 GK25LD is a genuine OEM gearshift unit designed for heavy-duty construction machinery transmissions. This component serves as the primary shift actuator within the transmission valve body, precisely directing hydraulic pressure to engage clutch packs and control gear selection. The SKU 4699.004.041 is a direct replacement for the original factory part, ensuring exact fitment and reliable performance in demanding off-highway applications. It interfaces directly with the 4699101002 HOUSING and the 4699301188 HOUSING to form a sealed hydraulic circuit.

Symptoms of Failure

• Erratic gear engagement or delayed shifting – When the GK25LD wears, hydraulic pressure to clutch packs becomes inconsistent, causing harsh or slow gear changes during operation.
• Transmission oil leaks around the shift housing – Deteriorated seals or a cracked actuator body allow ATF to escape, often pooling near the 4699301128 COVER or the shift shaft area.
• Intermittent neutral or loss of forward/reverse – Internal spool valve sticking or bore wear prevents proper oil routing, leading to sudden loss of drive direction under load.
• Unusual hydraulic whining or grinding noises – Contaminated fluid or worn actuator components create audible distress from the valve body during gear shifts.

Technical Specifications

Compatibility

This genuine ZF part is engineered for use in the following transmission families commonly found in construction machinery such as wheel loaders, graders, and telehandlers:

• ZF WG180 – 4-speed powershift transmissions
• ZF WG200 – 4-speed and 6-speed variants
• ZF WG210 – Heavy-duty off-highway applications
• ZF Ergopower – Select models with modular valve bodies

Always verify the 0636015047 HEXAGON SCREW torque specifications when reinstalling this unit to prevent housing distortion.

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