During operation, the four horizontal legs of the first fixed pin pull out, the site for the elastic suspension of the crane, tighten the stabilizer before placing the leg, until the hydraulic pump is empty for about 10 minutes, the rotary valve knob to " "All-pass" orientation, in accordance with the outstretched orientation indicated on the operating table of the leg, to move the horizontal leg operating handle, then the four horizontal legs are extended together (the throttle operating handle at this moment can pass the speed regulation and control level of the internal combustion engine. The speed of the outrigger is extended until the end of the stroke is reached, quickly reset the handle (to the neutral position). Then put the wood under the four straight legs and pull the handle of the straight leg to the direction of “stretchingâ€, then the four straight legs will protrude together. At this moment, attention should be paid to the investigation: After the tires on the rim and rear axle are all off the ground, the operation is immediately suspended. Then carefully check whether the frame girder or the turntable is horizontal. The slope of the reverse bearing surface should not be greater than 1/1000 (the standard bubble centered) when no load is applied. If the slope is too large, the twisting and straightening of the valve can be operated. The leg operation handle alone operates in the low straight leg cylinder and continues to lift until the entire machine is leveled and stopped. However, it is forbidden to adjust the high position hydraulic cylinder to the low position. This will cause the rear axle of the middle and rear axles to fall from the ground and affect the stability of the whole machine. After the leveling of the whole machine is completed, screw the rotary valve knob to the "full close" position. Cranes with legs that actively level the equipment do not need to be leveled manually.
When the crane finishes work or needs to move the worksite, the boom should be shortened and dropped onto the bracket. Then, the rotary valve knob should be in the “full-pass†orientation, and the straight-leg operating handle should face the closed position so that the four straight legs can be hydraulically operated. Cylinder is recovered, and the mid- and rear-axle tires are dropped; then the horizontal leg operating handle is advanced in the direction of closing, then the four horizontal legs are gathered together, finally the four horizontal leg fixing pins are inserted, and the rotary valve knob is pointed to “full†Closed" position.
With regard to the leg operation apparatus having five or five operation levers (handles), since the leg elastic operation levers and the leg selection levers are provided together, the rotary valve is no longer provided on this operation device.
When the crane finishes work or needs to move the worksite, the boom should be shortened and dropped onto the bracket. Then, the rotary valve knob should be in the “full-pass†orientation, and the straight-leg operating handle should face the closed position so that the four straight legs can be hydraulically operated. Cylinder is recovered, and the mid- and rear-axle tires are dropped; then the horizontal leg operating handle is advanced in the direction of closing, then the four horizontal legs are gathered together, finally the four horizontal leg fixing pins are inserted, and the rotary valve knob is pointed to “full†Closed" position.
With regard to the leg operation apparatus having five or five operation levers (handles), since the leg elastic operation levers and the leg selection levers are provided together, the rotary valve is no longer provided on this operation device.
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