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故障Ｉ ＤＨＨ８５０露天钻机修理完后调试时出现以下情况：当起动发动机并接上离合器时，因回油滤芯太脏致使报警灯亮（滤芯是客户提供的，刚换上），此时的回油压力为０． ３８ ＭＰａ。 图１为ＤＨＨ８５０露天钻机的部分液压回路图。该钻机的回油压力应为０． １～０．２ ?
Fault I DHH850 open-air drilling rig repair after debugging the following occurs: When starting the engine and connected to the clutch, due to the dirty oil return filter so alarm lights (filter is provided by the customer, just put on), the return pressure Is 0 38 MPa. Figure 1 shows a partial hydraulic circuit diagram of DHH850 open-air drilling rig. The return pressure of the rig should be zero. 1 ~ 0.2?