ZF 4699.109.078 BRAKE | OEM Genuine Part

Overview

The ZF 4699.109.078 BRAKE is an OEM genuine friction component engineered for the high-torque environment of construction machinery transmissions. This part functions as the primary holding and stopping mechanism within the planetary gearset, engaging directly against the clutch drum to modulate power flow. As a wear-critical element, the SKU 4699.109.078 ensures precise hydraulic engagement and disengagement, preventing unintended rotation in heavy-duty applications such as wheel loaders and excavators. It is designed to withstand extreme thermal loads and high-pressure oil environments, making it essential for maintaining operational safety and drivetrain integrity.

Symptoms of Failure

When the ZF 4699.109.078 brake wears beyond tolerance, operators typically encounter transmission overheating under load due to increased friction drag. A second common failure is intermittent gear slipping during forward-to-reverse shifts, where the brake fails to hold the planetary carrier stationary. You may also notice darkened or burnt-smelling transmission fluid caused by degraded friction material. Finally, erratic machine creep on inclines indicates the brake is no longer providing sufficient static holding torque, a critical safety concern for construction equipment.

Technical Specifications

Compatibility

This brake component is integral to ZF’s WG series powershift transmissions. It is directly compatible with the WG180, WG200, and WG211 models commonly found in telescopic handlers and compact loaders. It also fits select variants of the WG310 series used in larger wheel loaders. Always verify the clutch pack stack height when replacing this part alongside the 4699001185: GK10LD piston assembly, as improper clearance will cause premature failure.

During installation, the brake disc interfaces directly with the 4699101108: HOUSING which contains the hydraulic apply chamber. For complete rebuilds, inspect the 4699102172: INPUT shaft splines for wear, as damaged splines can cause uneven brake loading. Additionally, the 4699103057: OUTPUT flange must be torqued to specification to prevent axial play that degrades brake engagement.

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