Kobelco sk250-8 excavator single side walking without action
In this article, Sumitomo talked about the walking fault of the Kobelco excavator.
Details: a Kobelco sk250-8 excavator encountered the phenomenon that one side can't walk, but both sides can walk together during construction.
Fault diagnosis and analysis:
1. It is learned that the pressure switch of Kobelco sk250-8 excavator is good, and the plug also has electricity. Insert the plug of the stick into the walking pressure switch, and one side can walk, which is the phenomenon of holding the engine
2. Pull the plug of the closing and shunting solenoid valve, one side can go without choking the engine, but when two operating levers operate at the same time, the engine stalls when one operating lever moves forward and the other operates backward
3. Adjusting the PC valve didn't see any reaction. After adjusting the LS valve for a turn, one side can't walk again, and both sides can walk again. After adjusting the LS valve for half a turn, it can walk, but the force is smaller. I feel that the reaction is not that fast, but at the same time, operate one operating lever forward, and the choke behind the operating lever is not very serious, but it's still a little choke
4. Kobelco sk250-8 excavator is not a circuit problem, it may be the wrong connection of the pipeline, because the traveling circuit is normal and does not merge. If l mode is used, the action may not be normal. The merging problem is clear by checking the pressure on the display
Repair method of Kobelco sk250-8 excavator without action when walking on one side:
The traveling valve core of the main control valve of the excavator is stuck, disassembled and repaired; The built-in safety valve of the travel motor is faulty, which should be disassembled and repaired; The balance valve element of the travel brake valve is stuck, and it is disassembled, repaired or replaced; Travel motor failure, disassembly and repair; The traveling deceleration unit is faulty, which should be disassembled and repaired.
