The frequent occurrence of high water temperature faults in summer will bring us a lot of impacts, delays in construction period, and cost maintenance, so we will share with you today if we prevent the problem of excessive water temperature and experience the discovery of monitoring engines.
Excavator maintenance and repair experience: Check the high temperature of the engine of the Carter excavator in advance in summer.
Check the water level of the water tank is normal, the cooling fan is normal, the fan belt tension is normal, there is no belt slippage, and the oil quality and oil level are normal.
The water circulation system works normally, and can basically eliminate the faults of the pump and the thermostat. Check the temperature of the upper and lower water radiators. The basic contents of the fault that the thermostat is not turned on include: equipment maintenance, equipment inspection and equipment repair. In the overall structure of the excavator, the gear plays an important role. Once a crack appears on the surface of the gear of the excavator, the maintenance personnel must repair the gear in the first time.
If it is a fully computer-controlled machine, there are oil pumps with too much or too little oil, or the injection angle is not correct, which can easily cause high water temperature.
Motor overload, ignition too late, and hydraulic master pump power overload can also cause high water temperature.
Whether the cooling fan is working normally, also check whether the transmission belt is loose. If the transmission belt is too loose or too tight, it will cause the water temperature to rise rapidly.
Engine speed control The engine speed is selected through the fuel control panel. The fuel control panel is connected to a potentiometer. The power supply of the potentiometer is raised through the terminals 7 and 8 of the throttle controller. The fuel control panel is rotated to different positions, and the potentiometer outputs different voltages. The throttle controller equipped with a microcomputer according to this voltage The size of the selected engine speed can be calculated. Under a certain load, the engine speed is related to the circulating fuel supply of the fuel injection pump (that is, the position of the fuel supply rod). The fuel supply rod is driven by the governor stepper motor) through the link mechanism, and the motor shaft rotates to a different In the position, it corresponds to different fuel supply.
In order to detect the actual angle of rotation of the motor shaft, the motor drives a potentiometer through gear transmission, and the throttle controller indirectly measures the rotation angle of the motor shaft, that is, the position of the throttle lever, by measuring the output voltage of the potentiometer. The whole process is as follows: The controller drives the speed-regulating motor to rotate forward or reverse according to the measured output voltage of the fuel control panel potentiometer until the actual position of the motor and the position of the fuel control panel fed back by the motor corner potentiometer So far.
