Radio Remote Controlled Clamshell Grab Maintenance

It is advisable to change hydraulic-oil after first 500 working hours; then change the oil every 1000 working hours. Keep closing the oil box when change the hydraulic-oil. First, put container on the middle of under roof beam, open the cover on the bottom and bolt of oil trunk, then get the hydraulic oil inside the oil trunk out. Add oil into oil trunk through the top mouth of Breather filter. The hydraulic-oil is transfused by oil pumps and small impurities should be filtrated through an oil filter with a precision of 5~10μm for fear that those impurities lock the valve core of single directional valve, which will make the grab can not work. After adding oil, open the un-loading grab, loose the dipstick, move the moving board at least 10 cycles, in order to draw out the air inside hydraulic cylinder and pipes. After drawing the air out, check the oil level, the oil height should approach the first gap. If the oil is lower than this level, please add oil. At this time, the piston rod should retract into hydraulic cylinder completely.