ZF 4699.803.018 GK20 | OEM Genuine Part

Overview

The ZF 4699.803.018 GK20 is a critical OEM genuine component engineered for the robust demands of construction machinery transmissions. This part functions as a precision-machined guide or support element within the valve body or clutch housing assembly, ensuring accurate hydraulic fluid routing and consistent gear engagement. As an integral part of the transmission control system, the SKU 4699.803.018 directly influences shift quality and overall drivetrain reliability. When installed correctly, it maintains the necessary clearances and sealing interfaces that prevent cross-port leakage and pressure loss.

Symptoms of Failure

• Erratic or delayed gear engagement – When the 4699.803.018 wears, hydraulic pressure fluctuations cause sluggish shifting, especially in cold-start conditions.
• Internal transmission oil leaks – Deterioration of the sealing surfaces leads to visible oil seepage around the valve body or clutch housing area.
• Transmission slipping under load – A worn GK20 component fails to maintain proper clamping force, resulting in power loss during heavy excavation or lifting operations.
• Unusual metallic noise from the transmission – Excessive play in this part can generate a faint grinding or rattling sound during gear changes.

Technical Specifications

Compatibility

This genuine ZF part is primarily compatible with the WG180, WG200, and WG211 series transmissions commonly found in wheel loaders, excavators, and telehandlers. It also fits select Ecomat and Ergopower models used in construction machinery from 1998 to 2015. Always verify your transmission serial number before ordering.

During installation, this GK20 component works in conjunction with several adjacent parts. The 4699101046 HOUSING provides the primary structural enclosure, while the 4699301109 HOUSING secures the upper valve body section. A 4699301017 BEARING COVER protects the rotating assembly, and the 4699301085 COVER seals the access port. For complete assembly, ensure the 0634303141 O-RING and 0634309600 SHAFT SEAL are replaced simultaneously.

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