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The arm cylinder is an essential component of the hydraulic system of an excavator that allows it to extend and retract its arm, thus carrying out digging and material handling tasks. These powerful cylinders provide the necessary force for digging, lifting, and moving heavy loads.


Lead You To know About Excavator Arm Cylinder

A large double-acting hydraulic cylinder, known as an excavator arm cylinder, is mounted between the base and arm of an excavator. The components of it include a hollow cylinder barrel, a piston rod, and a piston. When the cylinder is filled with pressurized hydraulic fluid, the arm is moved as the piston rod extends or retracts.

The arm cylinder extends and pushes the arm outward from the base, resulting in the lengthening of the excavator’s reach. The arm moves closer to the base when it retracts. The excavator is able to effectively dig, lift, and dump material with this motion.

Main Components From Excavator Hydraulic Arm Cylinder

The essential components of an excavator arm cylinder include:

  • Barrel – The body that is hollow and cylindrical, housing the internal parts.
  • The piston is the part that moves and fits inside the barrel, dividing it into two chambers.
  • The extended part of the piston, known as the piston rod, is connected to the arm and undergoes movement both inward and outward.
  • Seals, known as O-rings, serve the purpose of preventing hydraulic fluid from leaking past the piston.
  • The mounting brackets are used to secure the cylinder to both the base and arm of the excavator.
  • Caps are responsible for sealing the ends of the barrel while also allowing fluid to pass into the cylinder.

Hydraulic Arm Cylinder’s Work Mechanics

When the cylinder barrel is entered by pressurized hydraulic fluid, force is exerted on one side of the piston. The arm is moved accordingly as the piston rod extends or retracts.

The force capacity of an arm cylinder is influenced by factors such as its bore size, stroke length, and hydraulic fluid pressure. For heavier duty excavators, larger cylinders offer increased digging forces.

Arm Cylinders Have Various Applications

Arm cylinders are utilized in a range of excavator types to supply the necessary power for:

  • The act of extending and retracting the upper arm can increase or decrease the reach while digging.
  • Material is moved by tilting the bucket cylinder attached to the arm when lifting and dumping loads.
  • Effective excavating work heavily relies on the arm motion required for digging trenches and excavations.
  • Arm cylinders power grapples, hammers, shears, and other attachments used for operating.
  • The arm’s range of motion is capable of handling a variety of materials, including demolition debris.