Hydraulic System Guide
Understand how your excavator's hydraulic system works, including pumps, valves, and cylinders.
Understanding Your Hydraulic System
The hydraulic system is the heart of your excavator, powering all movement and work functions. Understanding its components helps with troubleshooting and maintenance.
Safety Notes
- • Hydraulic fluid can be hot and under high pressure
- • Pinhole leaks can penetrate skin
General Steps:
Learn the main components: reservoir, pump, control valve, cylinders, and motors.
Understand that the pump creates flow, not pressure - pressure is created by resistance to flow.
Mini excavators typically use gear pumps (simpler) or piston pumps (higher pressure).
The control valve directs oil to different functions based on joystick input.
Cylinders convert hydraulic pressure to linear force for boom, arm, and bucket.
Hydraulic motors provide rotary motion for tracks and swing.
Relief valves protect the system from over-pressure damage.
Filters remove contamination - the #1 cause of hydraulic failures.
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