The steering failure of the excavator will seriously endanger the working efficiency of the excavator. After the failure occurs, the first thing to do is to troubleshoot the common faults. Summary 8 Beckon to teach you how to deal with it. Check these parts!
(1) Check whether there is water leakage from the outside of the steering system software of the hydraulic press
The clinical symptoms that indicate external oil leakage are: hydraulic oil is greatly damaged, the working pressure of the system software is reduced, and the fitness exercise of the steering cylinder and the motor is unstable, resulting in slow and weak steering, and even inability to steer. The key causes of external leakage are: poor matching of oil pipe joints, poor sealing performance, and cracked pipes; poor matching, damage, embrittlement or destruction of seals; excessive oil temperature, which will increase leakage. When oil leakage from the outside is found, maintenance should be carried out immediately.
(2) Check hydraulic oil
The quality and quantity of hydraulic oil will immediately jeopardize the working attitude of the steering system software. If the hydraulic oil is too little, the hydraulic oil pump will be interrupted due to the oil supply, which may lead to insufficient accidents and slow steering of the equipment. Therefore, the hydraulic oil should be added to the required level; when the hydraulic oil is not clean or the car When there is dirt in the fuel tank, the residue enters the hydraulic transmission system and causes the seal to be destroyed or the components to cooperate with each other, which will increase the internal leakage and cause slow steering. Therefore, it is necessary to carry out a careful inspection of the oil product of the hydraulic oil. If there is residue in the oil, the hydraulic oil should be dismantled and replaced immediately, and all hydraulic transmission systems should be cleaned up.
(3) Check the steering cylinder
When the piston rod of the steering master cylinder and the seal on the cylinder liner are damaged or destroyed, the internal leakage will expand, resulting in a slow posture of the steering cylinder. The inspection method is: remove the steering cylinder and refit it to another excavator whose steering is all normal for experimentation. If the steering is good after refitting, it indicates that the steering cylinder is not malfunctioning; if the steering is still slow after refitting, it indicates that the fault lies in On the seal of the steering cylinder. At this time, the steering cylinder should be checked for disintegration, and the damage of the piston rod and seals should be checked, and whether the cylinder liner was contused, etc., and then repaired in many ways.
(4) Check the steering pump
If the internal leakage of the steering pump is serious, it can also cause the equipment to turn slowly. One of the key reasons for leakage in the steering pump is that the gap between the side of the motor rotor and the leaf of the pump and the inner hole of the baffle plate is too large (all normal gaps should be within 0.047mm, and the larger should not exceed 0.100 mm). The inspection method is: under the condition that the steering cylinder, the central government swivel joint and the steering gear are all in good condition, a new pump is modified for comparison experiment; if the steering performance is good after the modification, it is confirmed that the common fault is the steering pump.
(5) Check the central government rotary joint
When the inner circle or the sealing ring of the rotary joint of the central government of the excavator is seriously damaged, all the oil and gas system software of the rotary joint will collude with each other at the place where the sealing is invalid, causing the posture of each system software of the rotary joint to fail. .
When the equipment is turning, the high pressure oil leaks into the air supply or other (suspension, feet, etc.) hydraulic lines, which in turn reduces the amount of hydraulic oil in the steering cylinder for the balance of supply and demand, resulting in a slow posture of the steering cylinder.
The inspection method is: turn up the manual pneumatic power switch of the wheel brake system. If there is welding fumes in the vapor sprayed from the inside, it indicates that the central government rotary joint has leaked hydraulic oil due to serious damage. The gas is in the air. At this time, the sealing ring of the central government swivel joint must be disassembled and replaced, and the central government swivel joint must be repaired.
(6) Check the steering gear motor
When the tunneling face of the motor stator and the motor rotor of the steering gear motor or the tunneling face of the rotary valve is severely damaged, the high pressure remaining oil entering the steering cylinder will decrease and the steering posture will be slow.
If the performance of the steering cylinder and the central government swivel joint are intact, the steering wheel can be hacked after the flame is turned off. If the front tire of the device can immediately shift and the touch is not important, it means that the steering gear is not good. , Should be repaired or replaced first.
(7) Check the single-channel steady flow valve
When the hydraulic oil working pressure of the steering system software of the hydraulic press becomes weaker due to the elastic force of the one-way steady flow valve, it will make the steering cylinder work weak, resulting in slow steering. You can take out the polyester plug of the remote control port of the valve base of the one-way steady flow valve and install the air pressure gauge; then start the diesel engine, hack the steering wheel to the left or right, and place it on the side of the front tire. Set up roadblocks;
At this time, observe the reading of the barometer. If the working pressure is not up to 7Mpa, the adjusting screw of the single-channel steady flow valve should be properly inward (first loosen the fixed nut), common failures can be Be corrected.
