Loader solution first check the pressure of the variable table, whether there is a blocking position in the buck phenomenon. If the pressure is less than 98.1KPa, a drive must be powerless. The causes of these phenomena is a piston ring scratch or excessive wear, the pressure oil leak too much, so that a driver cannot; in addition, also may be due to a block cylinder external O-ring damage caused by a large number of pressure oil leakage; if the fault is caused by the above reasons, we must put the gear open the box hanging out, replace the piston rings and seal ring damage; if the transmission pressure gauge in a position of no blood pressure, is likely to be the transmission rod is not adjusted in place, so that a driver cannot, should re adjust the transmission rod, making it to the specified position.