Secondary Steering System - If Equipped
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图 1 | g01444386 |
(1) 分流阀 (2) 辅助转向安全阀 (3) 高压滤网 (4) 辅助转向泵 (5) 液压油箱 (6) 箱体排油过滤器 (7) 旁通开关 (8) 选择器和压力控制阀 (9) 减压阀 (10) 单向阀 |
如果发动机发生故障,或如果主转向泵发生故障,辅助转向系统就会供应转向油和先导油。 辅助转向泵 (4) 是地面驱动齿轮泵。 辅助油泵位于变速箱前面。 如果机器在先进中,就只能用辅助转向系统转向。
正常运行时,由于自主转向泵引出的管道中有油压,分流阀 (1) 被向下压。 然后,从辅助油泵流出的油就会导回液压油箱。
报警开关位于选择器和压力控制阀 (8) 内。 转向油压下降时,报警开关就会启动。 驾驶室内的指示灯通知操作人员,转向油压已有损失,辅助转向启动。
如果主转向泵未能泵油,或如果主转向泵未能保持边缘压力,分流阀 (1) 就会因弹簧产生的压力而向上移动。 辅助转向泵 (4) 流出的油流过高压滤网 (3) (如有配备)进入分流阀 (1) 。 油流过分流阀。 单向阀 (10) 阻止从辅助转向泵流出的油流回主转向泵。 然后,辅助油泵流出的油流过转向控制阀,以便使转向油缸运行。
如果先导油泵发生故障,辅助转向泵也能供应先导油。 减压阀 (9) 使自辅助油泵流到先导油压的油减少。 然后,压力下降后的先导油就从减压阀流至先导阀(STIC 转向)。
自辅助油泵流出的箱体排油流过滤清器 (6) 。 机器配备 VIMS 和旁通开关 (7) 。 此开关可提醒操作员滤清器已经发生旁通的情况。
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