1, big arm lifting operation
When the right joystick is pushed back, the large arm of the main control valve is moved from the pilot oil from the remote valve to the rising position from the oil flow from the front and rear pumps, and then flows into the larger chamber of the large arm. At the same time, the oil of the large arm cylinder chamber returns to the hydraulic tank through the large arm of the main control valve. At this time, the excessive pressure in the brachial riser is too large to prevent the overflow valve from being lifted and the joystick is returned to the intermediate position, and the brake cylinder bottom balance pressure circuit is closed by the large arm balance valve. This prevents the natural sinking of the big arm cylinder
2, big arm decline
When the right joystick is pushed forward, the large arm of the main control valve is moved from the pump of the pump from the front guide of the remote control to the lower position, and then flow into the chamber of the large arm cylinder. At the same time, the oil of the large arm cylinder large chamber returns to the hydraulic tank through the large arm of the main control valve. At this time, the big arm decreased. When the decline rate of the large arm is accelerated, the oil retaining of the large arm cylinder chamber is combined with the oil of the rear pump, and then flow into the chamber of the cylinder. Thus, when the oil flow of the post pump cannot match the velocity of the large arm, it can prevent the cylinder due to negative pressure. And through the overflow valve prevents excessive pressure in the arm cylinder rod end loop.
3, hoar recovery operation
When the first push, the aerobic spool in the main control valve is moved to the retracted position from the pilot oil from the remote control valve.
The oil flows from the front and rear pumps into the main control valve, and then flow into the leaflet chamber. At the same time, the oil in the modern excavator aerobic cylinder chamber returns to the hydraulic tank through the operator in the main control valve. At this time, the arm was recovered.
The supplemental valve within the main control valve will prevent the pitch of the bottom of the arm cylinder.
4, the arm extension operation
When the left lever is pushed forward, the opener in the main control valve is moved to the extended oil in the protruding oil from the remote control valve.
The oil flows from the pump into the main control valve, and then enter the bump cylinder chamber.
At the same time, the oil of the led arm cylinder chamber returns to the hydraulic tank through the leading arm of the main control valve. At this time, the arm extends.
The supplemental valve within the main control valve will prevent the pitch of the arm of the arm cylinder rod.
5, bucket recovery operation
When the right joystick is pushed to the left, the bucket valve in the main control valve is moved from the pump of the pump from the remote valve to the retractable oil flow into the main control valve, and then enters the large chamber of the bucket cylinder. At the same time, the oil of the bucket cylinder chamber is reflows to the hydraulic tank through the arm of the main control valve. At this time, the bucket is recovered.
The supplement valve within the main control valve will prevent the pitch of the bottom of the bucket cylinder.
6, bucket reach out
When the right joystick is pushed to the right, the bucket valve in the main control valve is moved to the retracting position from the pilot oil from the remote control valve.
The oil flow of the post pump into the main control valve and then enters the chamber of the bucket cylinder. At the same time, the oil of the bucket cylinder chamber is reflows to the hydraulic tank through the bucket valve in the main control valve. At this time, the bucket was arbitrary.
The supplemental valve in the main control valve will prevent the cavity of the bucket cylinder rod end.
7, rotary operation
When the left joystick is pushed to the left or right, the rotary spool within the main control valve is moved to the left or right of the pilot pressure from the remote control valve. The oil flow of the post pump into the main control valve and then flows into the rotary motor. At the same time, the return motor returns to the hydraulic tank through the swivel valve in the main control valve. At this time, the upper turntable can be turned left or right.
The rotary motor is equipped with a rotary parking brake, a supplemental valve and overload relief valve. Supplemental valve can prevent the phenomenon of cavitation in the rotary motor
Rotary loop work
(1) Motor brake valve of the motor brake valve limit the buffering of starting and stopping the rotary pressure.
(2) Supplementary valve supplement valve prevents the occurrence of angular phenomena by providing oil to the vacuum of the motor
(3) Parking Brake If the machine needs to park in the slope, due to the weight of the machine, it may cause unintentional sliding. The parking brake prevents the machine from slipping without a manner.
1 Parking brake "OFF" work.
The parking brake is released from the pilot pressure from the pilot pump. When the left joystick is located in the swivel position, the pilot pressure of the shuttle valve is transferred to the brake release valve, and the brake release valve is converted. Then, the pilot pressure lift brake plunger makes the parking brakes 2 parking brake "ON" operation. When the joystick is located in the intermediate position, the pilot oil pressure drops. Then, the brake release valve returns to the intermediate position, and the return oil of the brake plunger is returned to the fuel tank. The brake is set in the ON position.
(4) The bypass valve bypass valve buffer generated by the rotary motion stops and reduces the homogenizer caused by the rotary movement.
