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1台沃尔沃L220E型装载机在使用超过1.6万h后,出现制动充压不足并报警现象,同时冷却风扇转速过低,进而导致发动机冷却水温度过高甚至“开锅”故障。1.制动液压系统工作原理该机制动系统工作原理如附图所示。踩下制动踏板1时,蓄能器组2向前、后桥制动装置提供高压油以实现制动。若多次踩下制动踏板1,且制动系统压力低于12.0 MPa时,制动压力开关SE504闭
When a Volvo L220E loader is used for more than 16,000 h, insufficient brake pressure is applied and an alarm is generated. At the same time, the cooling fan speed is too low, which leads to the engine cooling water temperature too high or even the “boiling pot” fault. 1. Braking hydraulic system working principle The braking system works as shown in the attached figure. When brake pedal 1 is depressed, accumulator unit 2 supplies high pressure oil to the front and rear axle brakes to effect braking. If the brake pedal 1 is pressed more than once and the brake system pressure is lower than 12.0 MPa, the brake pressure switch SE504 is closed