Excavator turned to slow the troubleshooting methods

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A WY4-60 excavators, sharp turn in the motion is often slow nose wheel steering failure phenomenon. Steering system works, yo u can determine if this failure is caused by decreased due to the volumetric efficiency of the hydraulic steering system and the system pressure is too low. The main causes of hydraulic system inside and outside a serious leak. Typically, the method can be used as follows to check and exclusion.
(1) Check the hydraulic external steering system for leaks.
External oil spill The main symptoms are: loss of hydraulic oil system pressure drop, steering cylinder and the motor\\ s movement is not smooth, resulting in turn turned to slow and weak, can not even turn to. Mainly due to external leakage: tubing connector mismatch, poor sealing and pipe rupture; seals mismatch, wear, aging or damaged; high oil temperature, thereby increasing the leakage. When discovered external oil spill, it is timely for maintenance.
(2) Check the hydraulic oil
The quality and quantity of hydraulic oil will directly affect the working status of the steering system. The hydraulic oil is too small, the hydraulic pump will lead to slow movement of the steering of the machine because of insufficient oil supply, so the hydraulic oil should be added to the prescribed surface; impurities into the hydraulic system when the hydraulic oil does not clean the fuel tank of a foreign body, will cause seal damage or components with the side injury, internal leakage increases, causing steering retardation. To this end, it should be the oil of the hydraulic oil, a careful examination. Oil, impurities and shall promptly replace the hydraulic oil, and cleaning of the entire hydraulic system.
(3) Check the hydraulic steering system is released into the air
Even a small amount of air into the hydraulic system will have a greater impact on the system, the steering cylinder crawling, reduce the efficiency of the hydraulic system, causing the steering to slow. Way of air into the hydraulic system: steering pump suction pipe connector loose or pipeline rupture; poor steering pump seal; low oil level within the tank, so that the suction pipe or return pipe exposed surface; hydraulic oil quality is poor. The check is this: start the engine, turn the steering wheel and observe the fuel tank, fuel tank emitted bubbles on the hydraulic system when the table into the air. At this time, to identify the reasons for and exclude.
(4) check the steering cylinder
When the steering cylinder piston and cylinder seals worn or damaged, internal leakage will increase, resulting in slow movements of the steering cylinder. The check is this: steering cylinder removed, switched to another excavator to turn to the normal experiment, if you dress up and turned to good, indicating that the steering cylinder has no problem; dress up and still turn to slow, the problem out in the steering cylinder seal. At this point, the steering cylinder should be the disintegration of checks, see piston and seals the damage, as well as the cylinder is pulled, and t hen be restored.
(5) Check steering pump
Steering pump leakage is serious, but also cause the machine to turn to slow. Causing leaks in the steering pump, one important reason is that the gap between the side and side face of the pump rotor and blades (normal gap should be less than 0.047mm, the maximum not more than 0.100 mm). The check is: in the steering cylinders, central rotary joint and steering performance are well, through the installation of a new pump to do the comparison test; such as dress up turned to good performance is proof of failure out of steering pump should be replaced The new pump.
(6) Check the central swivel joints
When serious wear and tear of the excavator central rotary joint at the inner cylindrical surface or ring, will swivel joints throughout the oil, gas system in a sealed failure at collude with each other, leading to the action of the swivel joints are not sensitive. When the steering of the machine, high pressure oil lea k into the gas line or other (suspension, legs, etc.) of the hydraulic piping, so that the supply of the hydraulic steering cylinder oil to reduce, leading to slow the action of the steering cylinder. The way to check is: up to flip the wheel brake manual gas switch, from its internal exhaust gas containing mist, then the central rotary joint so that fluid leakage into the gas path due to severe wear and tear. At this point, the central ring of the swivel joints to be replaced, and repair of the central rotary joint.
(7) Check the steering motor
When the steering motor stator and rotor face or turn the valve face serious wear, will make the actual high-pressure oil into the steering cylinder to reduce the slow turn to action. If the performance of the steering cylinders, central rotary joint is intact, you can turn off the engine after the steering wheel and killed, if the front wheels of the machine immediately deflection and feel heavy, it is clear is steering sh ould immediately repair or replacement.
(8) Check that the single-channel steady flow valve
When the oil pressure of the hydraulic steering system due to the weakening of the single-channel steady flow valve spring force is too low will make the steering cylinder weakness, causing the steering to slow. In this regard, can be single-channel steady flow valve base remote control port of the nylon plug removed, pressure gauge installed; then start the engine, will be killed by the steering wheel and place the left or right direction, and obstacles in the front wheel side matter; at this time, observe the pressure gauge readings, if the pressure of less than 7Mpa, should be appropriate to look inside of the single-channel steady flow valve adjustment screw (you must first loosen the nut), the fault can be excluded.