ZF 4699.804.036 GK25LD | OEM Genuine Part

Overview

The ZF 4699.804.036 GK25LD is a genuine OEM transmission component engineered for heavy-duty construction machinery. This precision-machined part functions as a critical interface within the valve body assembly of ZF powershift transmissions, regulating hydraulic flow to control clutch engagement and gear selection. The SKU 4699.804.036 is specifically designed to withstand high-pressure operating environments, ensuring consistent power delivery in demanding applications such as wheel loaders and graders. When installed alongside the 4699101049 HOUSING, it forms a sealed hydraulic circuit that prevents cross-contamination between transmission circuits.

Symptoms of Failure

• Erratic gear engagement or slipping under load: A worn 4699.804.036 can cause delayed or harsh shifting, particularly when the transmission is hot. This often manifests as “transmission slipping when accelerating” in construction equipment.
• External oil seepage from valve body area: Degraded sealing surfaces lead to “ZF transmission oil leak near shift solenoid” conditions, leaving visible drips on the bell housing or under the cab.
• Intermittent loss of forward or reverse gears: Internal wear may cause “powershift transmission losing reverse gear” scenarios, requiring multiple shift attempts to engage.
• Contaminated hydraulic fluid with metallic debris: Abrasion of the part’s hardened surfaces generates fine metal particles, detectable during “transmission oil analysis for construction equipment” inspections.

Technical Specifications

Compatibility

This genuine ZF part is compatible with the following transmission models commonly found in construction machinery: WG180, WG200, WG211, and WG250 series. It is also used in certain Ecomat 4HP and 6HP variants where the GK25LD valve body configuration is specified. The 4699.804.036 directly interfaces with the 4699301188 HOUSING and the 4699301128 COVER, requiring the 0636015047 HEXAGON SCREW for proper torque retention during assembly. Always verify your transmission serial number against ZF’s technical documentation before installation.

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