Volvo excavator parts: What are the ways to find problems in the hydraulic system?

Analysis on the possible causes of the failure of Volvo hydraulic system;

Cause analysis of oil-free fault in hydraulic system of Volvo excavator;

1 The excavator oil pump does not suck oil.

2 The drive device of the oil pump is out of order.

The connection between the oil pump and the driving device is cut off, which will also cause the hydraulic system of the excavator to have no oil fault.

Functions of hydraulic control system device, control valve, hydraulic lock and pilot valve of Volvo excavator

Volvo excavator 1 hydraulic lock

When the operating lever of the hydraulic lock is pulled, the oil pressure of the hydraulic pump is cut off by the sliding core and cannot enter the pilot valve. Therefore, even if the pilot valve is operated,

If the sliding rod of the control valve does not move, the transmission device will not work.

If the operating lever of the hydraulic lock is pushed, the oil pressure of the hydraulic pump flows to the pilot valve, and the transmission device can work.

2 Volvo excavator pilot valve function

Operate the driver's seat joystick to make the pilot valve generate oil pressure corresponding to the operating amount (stroke) and guide the pressure to the end of the control valve slide bar.

Through remote control, the sliding rod of the control valve moves to the position where the oil pressure and the spring are balanced to switch the sliding rod.