1 bucket recovery operation.
When the bucket is recovered, the pressure of the pilot control valve is supplied to the oil port XBK, and the bucket and the corset 5 moves to the left and other two springs 2, 3.
The hydraulic oil of the pump P2 enters the parallel channel, and directly into the oil port BK1 through the load check valve LCK, and then flows into the large cavity end of the bucket cylinder.
The backflow of the bucket tacho rod end returns to the bucket spaghetti core through the oil port AK1, and then passes directly into the oil opening R2 directly via the channel.
2 Modern excavator bucket extension operation.
When the bucket is extended, the pilot control valve is supplied to the oil port.
XAK, the bucket can move close to the spring 2, 3 toward the right.
The hydraulic oil of the pump P2 enters the parallel channel through the load stop valve LCK and flows directly to the oil port AK1, and then flows into the rod end of the bucket cylinder.
The backflow of the bucket cylinder rod end returns to the bucket valve core 5 by the oil port BK1, and then flows directly into the oil port R2 directly via the passage.
(4) When the rotary control spool is rotated, only the hydraulic oil of the pump PL is supplied to the rotary motor.
The pilot pressure of the pilot control valve is supplied to the oil port XAS, and the swinging and moving movement is moved in the left, the outer springs 7, 8.
The hydraulic oil of the pump PL flows into the swivel valve core 2 in parallel passages, and then, the swivel motor is directly entered by the check valve LCS and the oil port AS. Therefore, the rotation of the horse is rotating, and the return of the motor into the oil port BS. The oil returned by the motor returns to the fuel tank oil port R2 through the rotary and channel.
The left and right rotation work is basically the same.
