ZF 4699.803.004 GK20 | OEM Genuine Part

Overview

The ZF 4699.803.004 GK20 is an OEM genuine component designed for heavy-duty construction machinery transmissions. This part functions as a critical sealing and alignment element within the valve body or clutch housing assembly of ZF power shift transmissions. Its primary role is to maintain hydraulic pressure integrity and prevent contamination ingress, directly influencing shift quality and transmission longevity. The SKU 4699.803.004 is precision-machined to factory tolerances, ensuring a direct replacement without modification. When installed alongside the 4699101045 HOUSING and 4699301108 HOUSING, it completes the internal fluid routing system essential for consistent clutch pack engagement.

Symptoms of Failure

• Hydraulic oil seepage at transmission housing joints: Worn sealing surfaces on the 4699.803.004 allow pressurized oil to escape, leaving visible residue around the bell housing or valve body interface.
• Erratic gear engagement under load: When this part degrades, internal pressure drops cause delayed or harsh shifts, particularly when transitioning between forward and reverse in construction equipment.
• Contaminated transmission fluid: A compromised seal permits dirt and moisture to enter the hydraulic circuit, leading to premature wear of clutches and bearings. This often accompanies failure of the 4699301085 COVER.
• Whining or cavitation noise from transmission: Air ingestion through a failed 4699.803.004 creates aeration in the oil, producing audible pump noise and reduced torque output.

Technical Specifications

Compatibility

This genuine ZF part is primarily utilized in the WG180 and WG200 series power shift transmissions, commonly found in wheel loaders, graders, and telescopic handlers from manufacturers such as Volvo, Liebherr, and Caterpillar. It also appears in the WG150 and WG250 variants where similar valve body configurations exist. For proper installation, always pair this component with the 4699301014 THREAD PROTECTIVE SHIELD to prevent thread damage during assembly. Cross-reference your transmission serial number to confirm fitment.

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