HBT60 concrete pump as a mature technology of concrete construction machinery, has been widely used in construction, construction of bridges. The main mode of work for the "electric control - hydraulic." In order to promptly and accurately determine the reasons for the machine in the process of failure, parts, troubleshooting as soon as possible, now the machine in the course of the phenomenon of common failures and maintenance methods are listed. As follows: 1 motor with load start that is operating the disk "host Kai" switch, the main motor can not start or barely started, it will automatically pump action. First check whether the AC contactor is "burnt to death", if yes, replace the contact of the AC contactor; if not, open the wires of the solenoid valves A and B that control the pumping action and re-operate the "main switch" If the fault persists, check whether the solenoid valve core is "stuck"; if so, replace the solenoid valves A, B; if not, it is the main safety valve leak or spool Stuck, need to be replaced. 2 If the pressure is zero, solenoid valve A will not work, usually the switch, wire or solenoid coil will be damaged. If the pressure is too high (27.4MPa) , Then solenoid valve B is not working or the control line shut-off valve is not open. 3 for the anti-pump switch, not anti-pump check the main gauge pressure, if the pressure showed normal (reversing hydraulic pressure 10.5MPa), the solenoid valve C, D are not working; usually the switch, the line is damaged; Large (27.4MPa), then C, D two solenoid valve only one work. Solenoid valve maintenance and the same as the previous example. 4 Conveyor piston stroke is automatically shortened First check the stroke control valve is tightened closed, if not, to be tightened; if yes, open the valve spool, check the seal is damaged, if so, replace the spool seal; if not, replace Check if the unloading pressure of the closed circuit safety valve is lower than 12MPa. If yes, adjust it to be accurate. If not, it is the leakage of the main hydraulic cylinder seal. If the main hydraulic cylinder can not be repaired immediately, the piston can be set aside Valve loosen a little to ensure that each stroke does not shorten and the pressure does not exceed 11MPa prevail, so leakage compensation, short-term emergency use.