After the Komatsu PC430-8 excavator is started, the working device can realize various actions, but the main pump emits abnormal noise.
Komatsu excavator maintenance PC430-8 hydraulic pump has abnormal noise generally causes:
1. The oil suction filter blockage causes the main pump to be empty;
2. The hydraulic pump is not enough to cause the main pump to suck;
3. Air is mixed in the oil suction line;
4. The main pump is worn internally, causing abnormal noise in the main pump.
Komatsu excavator maintenance PC430-8 hydraulic pump has abnormal noise analysis, which is considered to be caused by the suction of the excavator pump or air mixed in the oil circuit. The position is below the low level of the oil standard, which is the position of lack of oil.
After inquiring the driver, the seal ring of the high-pressure fuel pipe leading to the rodless cavity of the stick cylinder was replaced due to oil leakage during work, but the oil level was not checked in time after replacement.
So, first fill the hydraulic oil tank to the standard oil level, the test machine shows that although the abnormal noise has been reduced, it still exists;
Then, exhaust the main pump through the main pump exhaust valve and try again. It is found that abnormal noise still exists, indicating that this noise cannot be completely caused by the pump suction.
The final result is that after replacing the seals, the oil level is not checked in time, resulting in insufficient hydraulic oil, causing the main pump to suck up; when the oil mixed with air flows through the main pump, the sliding shoes cannot float or float at some instants Insufficient, it can not form a good lubricating oil film between the shoe and the swash plate, which causes the shoe to wear, and eventually causes abnormal noise in the main pump work.
Komatsu excavator maintenance PC430-8 hydraulic pump abnormal noise elimination method:
First, the oil suction filter and the oil return filter of the hydraulic oil tank of Komatsu excavator were inspected, and it was found that the oil suction filter turned black and there was oil sludge, and brown metal particles were stuck on the oil return filter. For this reason, the above filter was replaced; considering the oil return Brown metal particles adhered to the filter element, so the oil of the main pump was discharged and inspected, and there were also brown metal particles; at the same time, when the main pump was disassembled and inspected, there was no damage to the piston, valve plate, swash plate, etc. The shoes have worn out. After replacing it, it was assembled in strict accordance with the requirements, the hydraulic system was cleaned and the oil was changed. When the test machine was started again, the abnormal noise disappeared and the fault has been eliminated.
