ZF 4699.109.088 BRAKE | OEM Genuine Part

Overview

The ZF 4699.109.088 BRAKE is a critical OEM genuine component engineered for the internal braking system of heavy-duty construction machinery transmissions. This part functions as a friction-based stopping mechanism, engaging directly within the planetary gearset to halt output rotation under load. It is specifically designed to withstand high torque and thermal stress in ZF power shift transmissions. The SKU 4699.109.088 identifies this as a factory-spec brake unit, ensuring precise fitment and hydraulic actuation response. When installed alongside the HOUSING and the INPUT shaft assembly, this brake provides the holding force necessary for safe operation in excavators and wheel loaders.

Symptoms of Failure

• Transmission brake drag or incomplete disengagement: Worn friction material causes the brake to remain partially engaged, leading to overheating and sluggish machine movement.
• Oil contamination with metallic debris: As the brake lining degrades, fine metal particles enter the hydraulic circuit, often visible during routine oil changes.
• Intermittent gear slipping under load: A failing brake cannot hold the planetary carrier stationary, resulting in unexpected loss of drive torque when digging or lifting.
• Audible grinding or chattering during shifting: Damaged brake plates produce a distinct noise when the transmission transitions between forward and reverse.

Technical Specifications

Compatibility

This brake assembly is designed for integration into ZF’s WG series power shift transmissions commonly used in construction machinery. It is a direct fit for the WG180 and WG200 models, as well as the WG120 series in certain configurations. The part interfaces directly with the GK10LD clutch pack and the OUTPUT shaft housing. Always verify your transmission serial number against the ZF parts catalog to confirm compatibility, as variations exist between early and late production runs.

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