ZF 4699.804.042 GK25 | OEM Genuine Part

Overview

The ZF 4699.804.042 GK25 is a precision-engineered OEM genuine component designed for the clutch pack and shift assembly within heavy-duty ZF transmissions. This part functions as a critical guide or separator element, ensuring correct oil flow and mechanical alignment between rotating clutch drums. It is commonly found in the forward clutch group of off-highway construction machinery transmissions. The SKU 4699.804.042 is manufactured to exact ZF tolerances, guaranteeing a direct fit and reliable hydraulic sealing under high torque loads. This component works in concert with the 4699101043 HOUSING and the 4699301106 HOUSING to maintain structural integrity within the transmission sump.

Symptoms of Failure

• Erratic gear engagement or delayed shifting: When the 4699.804.042 wears, hydraulic pressure bleeds past the component, causing soft or harsh clutch engagement. This is a common search query for “ZF transmission slipping under load.”
• Internal transmission oil leaks: A worn or cracked GK25 allows pressurized oil to escape into the sump, leading to low line pressure. Operators often search for “ZF transmission oil leak from housing.”
• Metallic debris in the oil pan: Friction from a degraded 4699.804.042 generates fine metal particles. This symptom is frequently queried as “metal shavings in ZF transmission fluid.”
• Overheating of the transmission: Insufficient oil distribution due to a failing separator causes localized heat buildup, triggering thermal warnings on construction machinery dashboards.

Technical Specifications

Compatibility

This OEM genuine part is primarily compatible with ZF WG180, WG200, and WG210 series transmissions used in wheel loaders, telehandlers, and graders. It also fits select variants of the ZF 4WG-200 and 4WG-310 power shift transmissions. For proper installation, ensure the 4699301015 HOUSING COVER and the 4699301085 COVER are inspected for wear simultaneously. The GK25 is not interchangeable with earlier GK20 series parts without modifying the clutch hub assembly.

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