快修宝

分享：**Analyzing the Problem and Crafting a Solution** Okay, so a Shanhe Intelligent 50E excavator is experiencing pressure on the P3 pump during travel and small arm retraction, but the engine isn't bogging down. I need to keep this concise, professional, and directly address the problem, avoiding any personal introductions. The system likely employs a load-sensing or multi-pump configuration, with the P3 pump handling auxiliary functions like pilot control, dozer blade, or swing. The pressure build-up during specific main pump actions suggests a blockage or unwanted connection in the P3 pump's circuit. The fact that the engine isn't straining indicates a localized pressure issue or internal leakage/cross-contamination. Possible causes come to mind: internal cross-flow within the multi-way valve (P1/P2 and P3 oil lines communicating internally), sticking or damaged logic or shuttle valves incorrectly transmitting pilot signals to the P3 pump circuit, misconnected or interfering pilot lines, or a stuck or over-pressurized relief valve associated with the P3 pump, causing immediate pressure build-up with even a small flow. My suggested repair steps will be: 1. Check the pilot control oil circuits (shuttle/logic valves). 2. Inspect the multi-way valve for internal cross-flow. 3. Verify the proper connections of all hydraulic lines, ruling out any recent installation errors. 4. Test the relief valve for the P3 pump. Here's the refined advice to troubleshoot this: 针对山河智能50E挖掘机在行走和收小臂时P3泵带压力且不憋车的故障，建议按以下步骤排查维修： 一、排查信号油路与梭阀。行走和收小臂动作的先导控制油可能通过损坏或卡滞的梭阀、逻辑阀，异常串入P3泵的油路。需拆解清洗相关梭阀，检查阀芯是否磨损卡滞，必要时更换。 二、检查多路阀内部串油。主控阀内部P1或P2油道与P3油道之间，可能因密封圈破损或阀芯严重磨损发生串油。请进行打压测试确认是否存在内泄，重点检查行走和斗杆联的阀段密封。 三、检查P3泵溢流阀。若P3泵相关回路的溢流阀卡死，少量串油即可导致P3泵异常建压且因流量小而不憋车。需拆洗P3泵主溢流阀，检查弹簧和锥阀，并重新标定压力。 四、核对管路连接。若近期进行过液压系统维修，需对照液压原理图，仔细核对先导管路及多路阀反馈管路是否接错。 建议优先使用压力表监测各回路压力变化，结合梭阀与溢流阀排查，即可定位故障。 This is clear and precise. Using a pressure gauge to monitor pressure changes in various circuits, combined with checks of the shuttle valve and relief valve, will help in pinpointing the issue.