How does the speed of excavator suddenly change from slow to fast during working? The following article mainly describes the fault analysis and maintenance of Kobelco sk200-3 excavator from slow to fast.
Cause of failure:
1. Internal and external leakage causes uneven speed and unstable operation
2. The oil temperature is too high, and there is no temperature compensation
3. Dirt is accumulated at the throttle port, which reduces the flow cross section and slows down the speed
4. The one-way valve in the one-way speed regulating valve is not tightly sealed.
5. The damping structure is blocked, and the system is immersed in air, resulting in pressure fluctuation and jumping, which makes the speed unstable
Kobelco sk200-3 excavator speed suddenly increases from slow maintenance method:
1. Check the dimensional accuracy and fit clearance of parts, repair or replace damaged parts
2. If it is a temperature compensation valve, there is no such fault. For the speed regulating valve without temperature compensation, the oil temperature should be reduced
3. Strengthen filtration and disassemble it for cleaning and oil change
4. Study and repair the check valve
5. Clean the parts with damping device, check whether the exhaust device works normally, and keep the oil clean.
Knowledge supplement:
What is the reason why the flow control handwheel of Kobelco sk200-3 excavator does not rotate properly? Analysis: the control valve core is blocked by dirt; The throttle valve element is under too much pressure; The inlet pressure is too high on the scale below the cut-off point
What is the reason for the failure of the pressure compensation device of Kobelco sk200-3 excavator? Analysis: the main valve is blocked by dirt; The small hole of the valve core or valve sleeve is blocked by dirt; The pressure difference between the oil inlet and the oil outlet is too small.
