1. In the pumping process of motor automatic stop

To check the concrete pump, and found that the main hydraulic system pressure is normal, and current up to 200A (motor rated current for the 140A). By inference, the fault is caused by the motor overload and not overload. Due to constant power variable displacement pump main hydraulic pump, if the main hydraulic pump constant power control too high can result in motor overload.

First check for constant power variable main hydraulic pump parts, and constant power values smaller, still has a big current shows had little effect on motor current constant power valve, and then check the hydraulic oil, found serious emulsification, murky. Replacement of hydraulic oil, cleaning the hydraulic system, and try again when pump has returned to normal operation. Therefore, motor automatic stop is due to hydraulic oil viscosity, oil absorption difficulties caused, thereby increasing the load on the motor, cause the motor to automatically shut down.

2. During the pouring process of concrete delivery pump burst forth from the rhythmic "cluck" sound pressure pulse

After careful debate and determine if the noise is emitted by the hydraulic pump. Because of the concrete pumps manufactured using 570h, in normal use, the pump components are not damaged, possibly due to the noise caused by the pump into the air. So, the main hydraulic pump exhaust, test machine, the fault persists. With disintegration of the main hydraulic pump removed, found that slipper and the plunger is "separation." Main hydraulic pump, hydraulic oil and filter replacement and cleaning the hydraulic system, and try again when the pump returns to normal. Analysis: the Slipper and pump main hydraulic pump piston damage, mainly due to serious pollution of hydraulic oil.