拖拉机上有不同功能的小孔 ,被堵塞会引发故障。用户应注意拖拉机的以下八个小孔不能堵 :油箱盖通气孔油箱盖通气孔与外界大气相通 ,堵塞后不能连续供油 ,造成马力不足等故障。回油孔此孔堵塞 ,随着喷油器弹簧所在空间积油增加 ,油压升高 ,使喷油泵泵来的高压油不能将针阀顶起 Tractors have different functions of the hole, is blocked will lead to failure. The user should pay attention to the tractor can not be blocked the following eight holes: Fuel tank cap vents Tank vents with the outside world, can not be continuous after the block fuel supply, resulting in inadequate horsepower and other failures. Back to the hole hole clogging, with the fuel injector space where the increase in oil, hydraulic pressure, high pressure oil pump to the pump can not lift the needle valve