The first measure the shaking gap of thread, carefully check the thread of bolts and nut is intact, then coated with molybdenum disulfide powder, lightly hand tighten the nut into the end, if encounter jamming phenomenon, you must exit to find a cause, can not hand hammer vibration or screwed force into. For large bolts of the cylinder, In the bottom of the cylinder wear deduction, it must also be according to the above process.