Service Brake Control Valve - Check
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制动特性改变或低气压警报,可能是制动器一个回路损坏的象征。 机器修理之前或所有回路检查之前就操作机器,可能会造成人员伤亡。 制动器修理后,一定要先检查制动器,才再把机器投入使用。 |
用两只 8T-0849 压力表组合 以检查通往机器两侧 工作制动器的输送压力。 把仪表接通到输送口 (4) 及 (6) 。
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图 1 | g00627729 |
工作制动器控制阀。 (1) 柱塞套 (1) 柱塞 (3) 橡胶弹簧 (4) 输送口 (5) 进气和排气阀 (6) 输送口 (7) 进气和排气阀 (8) 排气口 |
使空气调节阀向工作制动器供气,再使空气调节阀使工作制动器放气,反复多做几次。 检查测试压力表上的输送压力,以鉴别气压的改变。 踏板动作时,左右两侧工作制动器的气体压力应该一致。
把工作制动器全部施上。 把工作制动器松开。 把工作制动器松开后,测试压力表的即时读数应该0 kPa (0 psi)。
如果每侧气罐的气压一致,输送的气体压力在每只测试压力表上的读数应在35 kPa (5 psi)的范围。 对于工作制动器的控制阀,算是正常。
注: 如果机器的配置是按照欧洲行车配置的标准,则气压表是用于测量机架底下气罐与驾驶室后面气罐,两者之间输送气体压力的区别。
把压力表组合取下,再在通口上装上软管 (4) 及 (6) 。
检查工作制动器控制阀有否漏气
当施上工作制动器并把它定住时,使气压保持在 795 至 965 kPa (115 至140 psi) 在排气口上 (8) 涂上皂水。 允许的漏气量是三秒内出现的气泡大小为 25.0 mm (1.00 inch)。 如果三秒内漏出的气泡大小超过25.0 mm (1.00 inch),应把工作制动器的控制阀加以修理。 修理完毕后,工作制动器控制阀还要再次检查。
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