ZF 4699.041.017 GK26LD | OEM Genuine Part

Overview

The ZF 4699.041.017 GK26LD is an OEM genuine transmission control unit, specifically a valve housing assembly, integral to the hydraulic modulation system in ZF powershift transmissions. This component regulates oil flow and pressure to clutch packs, ensuring precise gear engagement. The SKU 4699.041.017 is a direct replacement for the original factory part, designed to restore shift quality and prevent drivetrain damage in heavy construction machinery. It sits within the transmission’s main control body, interfacing directly with the 4699101086 HOUSING and the 4699301223 HOUSING to form a sealed hydraulic circuit.

Symptoms of Failure

• Erratic or harsh shifting under load: Worn internal bores or spools in the 4699.041.017 cause pressure spikes, leading to jarring gear changes during excavation or grading operations.
• Delayed engagement or clutch slip: A failing valve housing reduces pilot pressure, resulting in a noticeable lag when shifting from neutral to drive or reverse, often accompanied by high RPM without movement.
• External hydraulic oil leaks: Cracks or gasket failure at the mating surface with the 0636302022 SCREW PLUG or 0501319149 SCREW PLUG can cause visible oil seepage around the transmission control block.
• Transmission overheating: Internal leakage past worn valve lands generates excess heat, often triggering warning lights on construction equipment dashboards.

Technical Specifications

Compatibility

This valve housing is engineered for ZF WG-series powershift transmissions commonly used in wheel loaders, dozers, and telehandlers. It is a direct fit for the WG180 and WG200 transmission models, and also compatible with certain variants of the WG160 and WG210 series. For proper installation, ensure the 0501323165 SHAFT SEAL and 4699301222 COVER are inspected and replaced if worn. The 0634303996 O-RING and 0630513060 SNAP RING are also critical for sealing and retention during reassembly.

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