In the work, once encountered the situation that the excavator turns slowly, it will seriously slow down the construction work speed. So, what should I do when this happens at work? Kobelco excavator repair authoritative experts will give you a major investigation:
first step
The steering system of the hydraulic press should be checked for leaks. When the hydraulic oil is damaged greatly in the digging opportunity, the working pressure of the machine system is reduced, the movement of the steering cylinder and the motor is not smooth, and the steering is slow and weak. When the steering fails, it is regarded as a water leakage fault.
The key reasons for the forced water leakage failure are as follows: the application of the sealing parts is damaged or embrittlement, the tubing joints cannot be matched, the socket gap, the sealing is not good, or the oil pipeline is cracked, causing the hydraulic oil to leak. Maintenance should be carried out immediately.
Second step
Specific inspections should be carried out on the quality and quantity of hydraulic oil that will directly harm the attitude of the steering gear system. When the hydraulic oil is too low, the hydraulic oil pump will slow down the steering operation of the machinery and equipment due to insufficient oil supply. Therefore, the hydraulic oil should be added to the level specified by the standard; when the hydraulic oil is not clean or there is dirt in the car tank, After the residue enters the hydraulic system, it forces the hydraulic seal to be destroyed or causes the components to cooperate with each other and damages, so that the internal leakage is increased and the steering is slow. Therefore, the oil quality of the hydraulic oil must be carefully checked. If residues appear in the oil, the hydraulic oil should be replaced immediately, and all hydraulic systems should be cleaned up.
third step
When the gas enters the hydraulic system, even if the gas is only missing, the system will cause great harm, causing the steering cylinder to crawl, reducing the working efficiency of the hydraulic system, and causing slow steering. The ways for gas to enter the hydraulic system are as follows: the connector of the steering pump suction and delivery pipe is loose or the fuel delivery pipe is cracked; the steering pump is not tightly sealed; the oil level in the automobile fuel tank is too low, so that the suction and delivery pipe or the return pipe is exposed to the liquid level; The hydraulic oil is of poor quality.
Inspection method: Start the diesel engine and check the fuel tank of the car while turning the steering wheel. If bubbles appear in the fuel tank of the car, gas has entered the hydraulic system. At this time, find out the cause and solve it.
the fourth step
After the inspection of the hydraulic system is over, check the piston rod and cylinder liner of the steering master cylinder. When the cylinder liner hydraulic seal is damaged or destroyed, the internal leakage will expand, causing the steering cylinder to operate slowly. The inspection method is: remove the steering cylinder and replace it with another excavator whose steering is all normal for inspection. If the steering is good after the modification, it indicates that there is no problem with the steering cylinder; if the steering is still slow after the modification, it indicates that the situation is wrong. On the hydraulic seal of the steering cylinder. At this time, the steering cylinder should be dismantled and inspected, the piston rod and hydraulic seals should be checked for damage, and whether the cylinder liner has been contused, etc., and then repaired.
the fifth step
If the internal leakage of the steering pump is serious, it can also force the machinery and equipment to turn slowly. A key cause of leakage in the steering pump is that the gap between the motor rotor and the side of the leaf of the pump and the inner hole of the baffle is too large (all normal gaps should be within 0.047mm, and the maximum should not exceed 0.100mm).
Inspection method: Under the condition that the steering cylinder, central rotary joint and steering gear are all intact, refit a new pump for comparative inspection; if the steering characteristics are good after refitting, it is confirmed that the fault is in the steering pump and should be replaced. Pump.
Sixth step
When all the failures of the parts have been checked and resolved, only the final step of the specific check of the steering gear motor is needed. When the working surface of the stator and the rotor of the motor or the working surface of the rotary valve is seriously damaged, the high pressure remaining oil entering the steering cylinder will be reduced, resulting in slow steering operation. If the characteristics of the steering cylinder and the central rotary joint are intact, the steering wheel can be killed after the flame is turned off. If the front tires of the machinery and equipment can immediately shift and the touch is not important, it means that the steering gear is not good. , It should be repaired or replaced first.
Summary: Do you understand the above methods? You don’t need to be nervous when you encounter a failure during work. Calm down, analyze the cause of the failure step by step according to the specific manifestation of the failure. Only in this way can the failure be resolved reasonably and the work damage caused by the failure can be minimized.
