3084716 Original Excavator Parts Swing Brake Piston for ZX110

The original rotary brake piston part number 3084716 is the core actuator component in the rotary brake system of Hitachi ZX110 series small excavators. It is mainly compatible with ZX110 series models such as ZX110, ZX110-5G, ZX110-5A, and may also be compatible with Hitachi excavators of similar tonnage such as ZX70 and ZX130. This piston is usually installed in the normally closed multi disc brake inside the rotary motor, and together with friction plates, springs, and other components, forms the rotary brake mechanism. It is responsible for locking the upper vehicle rotation by pressing the friction plates with spring force when the hydraulic oil pressure is released. When placing an order, the complete model and serial number of the equipment must be provided to ensure that the size matches the seal perfectly.

This product belongs to hydraulic brake pistons and is usually made of high-strength alloy steel or cast iron material. The surface has been precision ground and treated with rust prevention to ensure long-term stable operation in high-pressure oil. Its structure is equipped with a ring groove for installing sealing rings (usually equipped with O-rings or rectangular sealing rings) to prevent hydraulic oil leakage; One end of the piston is in contact with the return spring, while the other end directly or through a pressure plate compresses the friction plate group. As an original component, its dimensional accuracy, material hardness, and sealing groove design are strictly matched with Hitachi's original brake assembly, ensuring sensitive braking response and reliable sealing, avoiding faults such as brake slip, oil leakage, or poor return caused by size deviation of auxiliary components.

It is recommended to check the rotary braking performance every 500 working hours and monitor for any abnormal friction sounds; Check the brake fluid for cleanliness and leaks every 2000 working hours or annually, and measure the piston stroke for normal operation. Troubleshooting: If there is a malfunction, abnormal noise or stuck rotary motor in the rotary brake, the brake oil circuit pressure and oil cleanliness should be checked first; After disassembling the brake, focus on checking the surface of the piston for any scratches or rust, and whether the sealing ring is aging or damaged; If the piston gets stuck, try lightly polishing it with fine sandpaper and replacing the sealing ring. Replacement suggestion: Non original pistons may have issues such as insufficient material strength and deviation in sealing groove size. It is recommended to use original parts to ensure brake safety