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In the past, because the diesel engine oil of Dongfeng 7 diesel locomotive had no accurate pressure test and the oil pressure was high, it would accelerate a series of failures such as gear wear and pipeline aging. When the oil pressure was low, it would easily cause rolling and other traffic accidents. This section was equipped with a pressure gauge on the diesel engine oil pipe. The hydraulic pressure relay is connected with the pressure gauge through the oil return copper pipe. After fixing the pressure gauge with the bolt, the driver can monitor the oil pressure at any time.
Liu Changwan, the driver in charge of the Dongfeng 7 diesel locomotive's shunting task, said happily: “In the past, we used the experience to estimate the oil pressure and often caused the deviation and caused the failure. Now it is OK. We can adjust the oil pressure at any time. Protection!" 
Install pressure gauge to monitor oil pressure
Recently, the Fuyang Locomotive Section completed the installation of pressure gauges for the end of the diesel engine oil of 33 Dongfeng 7 diesel locomotives assigned in the segment, to eliminate the failure caused by high or low oil pressure.