1. The noise of the oil pump is too loud (heating too fast) and the oil pump is damaged 1). The oil pump is absorbed by the oil pump suction pipe or the oil tank is too low; 2). The oil temperature is too low, the oil viscosity is too big, which causes the oil absorption resistance; 3). The oil filter is blocked and the oil is dirty; 4). Pump damage (pump installation injury) by any beat; 5). The installation of the coupling, such as axial tight, the motor shaft and the axis of the pump will not be on the line; 6). The duration of the test after the pump installation is reversed or not refueling; 7). The high pressure filter is blocked or the flow is not up to standard; 8). Oil pump suction (there is oil, but there is air at the oil pump suction mouth); 9). If it is a plunger pump, it may be that the height of the return oil outlet line is too low; 10). If it's HOEBIGER oil pump, then it might be gas; 11). The oil temperature is too high, results in the decrease of viscosity (60...
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