Repair:
During the field test, it was found that there was rotation, but there was no brake, and there was a sound during the rotation, because the rotary motor was disassembled and replaced with the pump liner plane and plunger for the excavator. It was suspected that it was an assembly error, and no abnormality was found after opening the motor. The bite trace of the gear was found on the end cover of the motor spline, and the connecting teeth were checked. It was found that the gasket under the central sun gear was worn out in the last figure, so it did not play a limiting role. When rotating, The four-star tooth moves upward. When it reaches the top position, the Central Sun tooth goes empty, resulting in no braking. After forcibly stopping, the four-star tooth returns to the lower position. In this way, the rotation is normal, and there is a sound because the Central Sun tooth is worn to the bottom of the four-star tooth
terms of settlement:
The fault disappeared after replacing the new limit gasket.
Extended reading:
High water temperature of Kobelco sk260lc-10
A large excavator with a working time of 6500 hours, Kobelco sk260lc-10 high water temperature water tank and hydraulic oil radiator have been replaced, but the water temperature is still above 95 ℃.
Check:
First check whether the water temperature is high or the oil temperature is high? If the oil temperature is high, what is the hydraulic oil temperature? There is a regulating valve (at the joint of the hydraulic oil pipe) in the hydraulic oil radiator of the excavator, which can adjust the flow, and reducing the flow can reduce the oil temperature If the water temperature is high, do the following checks: observe the water circulation in the water tank? If it doesn't circulate, the water pump is broken Observe whether the fan is loose? Is the opening range of thermostat appropriate? Or clean the water tank and remove the thermostat (the thermostat needs to be installed before the excavator works in winter) observe whether the water temperature gauge and sensor are damaged.
