Kato HD450 excavator suddenly can not move    

A Kato HD450 excavator at work suddenly appeared in the car but no action phenomenon, the engine can start digging, digging machine operation handle no reaction, pilot solenoid valve can pull, will not start the pump tubing to unload the hydraulic oil.

Let's take a look at the common reasons:

1 may be a pilot pump part out of the problem.

2 the connection block of the hydraulic pump with the engine is problematic.

3 the problem of hydraulic pump.

4 the lack of hydraulic oil or the failure of the hydraulic lock.

5 first look at the insurance has no problem, and then look at the relevant sensor, and then look at the pilot part (handle, pilot pump).

6 possible plugging of the hydraulic system.

7 first check electricity, electrical system, no problem, and then check the hydraulic system (check the pilot, check valve).

8 hydraulic parts damaged

9 the control system is out of order

On the failure analysis of this event:

1 safety lock grounding switch is broken, no digging action.

2 the coupling is broken.

3 no oil shows that the hydraulic pump has no power, the shaft does not turn and the coupling is likely to be damaged.

4 may be no oil pump coupling is broken, even if no action is not entirely bad electromagnetic valve is broken resistance lead electromagnetic valve thimble short stroke cannot be opened with the speed of the walking gear change.