ZF 4699.841.023 GK26LD | OEM Genuine Part

Overview

The ZF 4699.841.023 GK26LD is a genuine OEM transmission control valve body, a critical hydraulic component that regulates clutch pressure and gear selection within ZF powershift transmissions. Positioned inside the main transmission housing, this part directs oil flow to engage specific gear sets based on machine load and speed. The SKU 4699.841.023 is precision-machined to maintain exact oil passage tolerances, ensuring smooth shifting under heavy construction loads. When this valve body wears, it directly compromises the transmission’s ability to hold pressure, leading to erratic or delayed engagement.

Symptoms of Failure

• Delayed or harsh gear engagement – When the valve spools stick due to contamination, you will notice a noticeable lag or a hard “clunk” when shifting from neutral to drive or reverse. This is a common search query for “ZF transmission hard shifting repair.”
• Transmission oil leaks at the valve body interface – Worn sealing surfaces on the 4699.841.023 allow pressurized oil to escape, often pooling around the 4699101086 HOUSING or the 4699301223 HOUSING. Look for wet spots on the transmission pan.
• Gear slippage under load – If the valve cannot maintain clutch pressure, the transmission will slip when the machine is under heavy load, such as climbing a grade or digging. This often leads to a search for “ZF transmission slipping under load causes.”
• Erratic shifting patterns – The transmission may skip gears or fail to shift at the correct RPM, indicating internal valve bore wear in the GK26LD assembly.

Technical Specifications

Compatibility

This valve body is engineered for ZF’s heavy-duty powershift transmission series used in construction machinery. It is a direct fit for the WG180 and WG200 transmission models, which are commonly found in wheel loaders, dozers, and graders from manufacturers like Liebherr, Volvo, and Caterpillar. It may also be compatible with certain WG150 and WG250 variants, though cross-referencing the transmission serial number is recommended. The 0634801038 SEALING RING and 0730365801 TYPE PLATE are often replaced concurrently during valve body service.

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