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1台SD品牌某型号推土机装机后,其推土铲提升后几分钟内便出现大幅度自动下降故障,无法满足正常工作需要。1.故障排查推土机推土铲液压提升回路原理如图1所示。根据原理图分析,首先检查推土铲提升缸,未发现液压油泄漏。将先导手柄置于中位,拆开控制提升缸的换向阀两侧K22和K55胶管,均无先导油液进入,由此说明控制提升缸的换向阀阀芯没有偏移。
1 SD brand a bulldozer installed, the bulldozers within a few minutes after lifting a substantial decline in the automatic failure will not be able to meet the needs of normal work. 1. Troubleshooting Bulldozer bulldozer hydraulic lift circuit shown in Figure 1. According to the schematic analysis, first check the dozer lift cylinder, hydraulic oil leak was not found. Put the pilot handle in the neutral position and disassemble the K22 and K55 hoses on both sides of the reversing valve that controls the lift cylinder without pilot oil entering. This shows that there is no shift in the valve spool of the reversing valve that controls the lift cylinder.