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1.转向盘不能转动一台沃尔沃L90D型装载机出现转向盘不能转动故障。转向盘不能转动可能有以下几种原因:缺少液压油;转向阀卡死;转向马达先导油压力不足;转向泵不泵油。对照其液压系统图(见图1)检查,液压油量正常,管路各接头无泄漏;用手触摸转向来油管有振动感,表明有压力油流动。该机在不转动转向盘时,系统压力应为2.8～3.2 MPa;在怠速时转动转向盘时,系统压力应上升到20～21 MPa。怠速时用测压表测得系统压力仅为2.2 MPa,发动机最高转速时系
1. steering wheel can not turn a Volvo L90D loader steering wheel can not turn fault. Steering wheel can not be rotated for the following reasons: lack of hydraulic oil; steering valve stuck; steering motor insufficient pilot pressure; steering pump not pumping oil. Check the hydraulic system diagram (see Figure 1) check, the normal amount of hydraulic oil, pipeline joints without leakage; hand touch the steering hose to have a sense of vibration, indicating the pressure oil flow. The system does not turn the steering wheel, the system pressure should be 2.8 ~ 3.2 MPa; turn idling steering wheel, the system pressure should rise to 20 ~ 21 MPa. Idle speed measured with a manometer system pressure of only 2.2 MPa, the maximum engine speed system