Low heat dissipation efficiency of radiator
The tube is replaced with the fin type heat sink of the chip heat dissipation plate, and the heat dissipation area is increased by 8 square centimeters. The temperature difference between the radiator and the outlet can be increased to 7 ° C and 10 ° C, and the effect is obvious.
The check valve on the hot return circuit has failed. Hitachi excavator maintenance is the market leader of large hydraulic excavator maintenance. Through the unremitting pursuit of quality and the principle of excellent construction machinery, we have manufactured machines with high strength and long service life to meet the requirements of users in the mining industry.
The return pressure of the existing system is 0.3MPa, and the protection pressure of the oil engine is 0.2MPa. According to the theory, the oil return pressure should be as low as possible to meet the system back pressure requirements. The oil temperature is too high and the excavation is insufficient. You can open some long grooves on the side door to increase the air intake.
(2) During the maintenance period, there is a gap between the radiator and the engine, and there is no effective seal. The front of the counterweight is concave, and the hot air forms eddy currents, resulting in poor heat dissipation effect. The sponge can be pasted between the radiator and the engine for sealing, and the front of the counterweight can be changed from concave to flat. Komatsu excavator repairs the electrical and main parts of the engine, hydraulic device, height control engine and hydraulic device, all of which are developed and produced by Komatsu company. Make use of the above "Komatsu technology essence" to conduct "face-to-face" communication with customers, so that "Komatsu technology" has continuous initiative and accumulation, thus reaching an extraordinary height.
③ The main pump of the hydraulic system of the insulating plate is lost, so that the hot air blown from the engine is directly to the rear side wall of the hydraulic tank, and the temperature of the tank is increased, which can be improved by adding the insulating plate.
The fins of the radiator air duct of the hydraulic system collapse or the oil duct is blocked, resulting in an increase in wind resistance and poor performance of the excavator maintenance workshop. The maintenance transmission mechanism of Carter excavator transmits the power of the engine to the hydraulic motor, hydraulic cylinder and other actuators through the hydraulic pump to drive the working device to complete various operations.
The dropped fins should be adjusted in time to clean the air channel blockage. It must be flushed regularly with certain pressure water to ensure that the air passage is unblocked.
Improper selection of hydraulic oil level or poor oil quality. Sumitomo excavator maintenance equipment is a kind of equipment that directly completes excavation tasks. It consists of three parts, namely, movable arm, bucket rod and shovel. The lifting and lowering of the boom, the expansion of the stick and the rotation of the bucket are all controlled by the reciprocating double acting hydraulic cylinder. In order to meet the needs of various construction operations, the excavator maintenance can be equipped with various working equipment, such as excavation, lifting, loading, leveling, clamping, bulldozing, impact hammer and other working equipment.
If the viscosity of the hydraulic oil is too low, the leakage will increase, reducing the efficiency and generating heat. If the viscosity is too high, the fluid pressure will increase the loss, and a large amount of heat will be generated, which will cause the oil temperature to be too high. The difference is that it is easy to emulsify oil, which will aggravate the damage of the hydraulic components.
After the improvement, the temperature difference between the inner and outer walls of the oil tank is reduced from 8 ℃ to 1-2 ℃.
