Excavator pilot accumulator solenoid valve

What is a pilot control valve?

Among them, the pilot control valve is one of the main hydraulic components of the system. There are 3 pilot control valves in the whole vehicle. Among them, the boom pilot valve and the bucket pilot valve share the next valve body, which is controlled by the right joystick in the cab.

What is the purpose of the accumulator?

The accumulator stores pilot pressure oil for use at the main control valves. During multiple operations, the pilot system will demand more oil in order to maintain valve operation. The accumulator provides pilot pressure oil to the pilot system, when the pilot pump flow is inadequate. Inadequate flow will cause sluggish implement control.

How does a pilot oil accumulator work?

The pilot oil now flows through passage (18) and inlet port (19) into pressure oil chamber (20) . The pilot oil acts against bladder (22) and the nitrogen gas in gas chamber (23) is compressed. Check valve (29) prevents a backflow of the stored oil in the accumulator. The stored oil is used for solely operating the stems of the main control valve.

When does accumulator (5) provide pilot pressure oil?

Accumulator (5) will provide pilot pressure oil to the pilot system when the pilot pump flow is inadequate. Insufficient supply of pilot oil flow to the pilot system may be caused by the following two reasons: Implements are lowered while the engine is stopped and oil supply to the main control valves is stopped.

How do you operate a sole-Noid valve?

Operate the control levers to open or close each sole- noid valve, and measure the pressure.

How does a pilot oil pump work?

The pilot pressure oil flows from the pilot pump through the P port, the oil hole f, and the Pi port to the main operating valve A chamber. When the pressure at the Pi port increases, the slide valve 1 is pushed back , The oil hole f cuts off the pressure chamber Pp and communicates with the oil return chamber D.