How does the CAT325 excavator appear slowly and the engine is stuck in the car?

CAT325 excavator if the action is slow, the engine car failure, in the pilot oil circuit is normal, mostly proportional solenoid valve and solenoid valve control circuit failure. Should focus on checking the controller output, line, proportional solenoid valve coil has no short circuit and open circuit fault, because the excavator movement speed and digging force varies with the size of the external load, the load increases, the engine speed is reduced.

When the computer detects the speed of the pump down when the input to the control current proportional solenoid valve can be reduced, through pilot oil control variable pump swashplate angle becomes smaller, the pump output flow rate decreases, the engine load is reduced, and the engine speed increases, until the set speed equal to check. At this point, the engine is working in the best position of the throttle setting, the engine has the maximum power, will not suppress the car and flameout. When the ratio of the control circuit when a fault occurs, the output of the pump cannot adapt to the change of external load, when the external load continues to increase, the pump output cannot automatically adjust the engine speed will continue to decrease until flameout, so there are serious suffocating car phenomenon.

If a slow, weak mining, but the engine does not suppress the failure of the car, in the pilot oil line under normal circumstances, mostly pressure and flow adjustment system failure. First of all, the main relief valve should be transferred, the main pump pressure to 30~32MPa, and then adjust the flow. If the power regulator is adjusted, the flow cannot be adjusted to the required range. Adjustable flow control valve. The adjustment of the flow control valve is adjusted by increasing or decreasing shim, the gasket is increased, the flow rate is increased, the gasket is reduced, and the flow rate is reduced. If there is a flow test instrument, the flow sensor will be strung into each single pump loop, and the engine will be rated at the rated speed. Under no-load condition, the flow will be adjusted to 240L/min. If there is no flow test instrument, can only rely on the speed of action, with experience and feeling to adjust the flow.