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II号喷油泵不同于A4CB—8.5×10喷油泵,它是靠带回油阀的回油阀总成来控制低压油道的压力。有些同志不知道这种区别,在II号喷油泵回油孔上安装了不带回油阀的普通回油螺栓,以致低压油道不能建压,燃油系统内空气增多,拖拉机工作不稳。换上II号泵自己的回油阀总成后,故障便可排除。
The II pump differs from the A4CB-8.5 × 10 pump in that it controls the pressure in the low-pressure gallery by the return valve assembly with the return valve. Some comrades did not know the difference. The common oil return bolt without oil return valve was installed on the oil return hole of No.2 jet pump so that the pressure of low-pressure oil passage could not be built. The air in the fuel system increased and the tractor worked unsteadily. Put on the II pump’s own return valve assembly, the fault can be ruled out.