GM38VB-A-79-131 Piston Set (Piston Set) is the hydraulic piston group typically used inside an excavator travel motor / final drive.

What is included in the piston set?

Usually, the piston group of an axial piston motor consists of:

• Pistons

• Piston shoes

• Retainer / set plate

• Sometimes pins or small connecting components

These pistons move back and forth inside the cylinder block, converting hydraulic energy into mechanical rotational motion.

Function inside the travel motor

Inside the travel motor, the piston set:

• Converts hydraulic pressure into mechanical power

• Slides on the swash plate to generate rotation

• Enables the movement of the excavator tracks

Basic working principle

1. High-pressure oil from the pump pushes the pistons.

2. The pistons slide on the swash plate.

3. This movement causes the cylinder block and shaft to rotate.

4. The rotation passes through the reduction gear (planetary gear) and finally drives the excavator tracks.