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1.故障现象及原因将1台配装YT484—24型发动机sF50x型叉车整车装配完成并接通电源后,还未启动发动机,其进气口处便突然出现高温,将进气胶管烧坏。发动机未启动,可排除发动机本身故障的可能。检查发现,发动机进气口产生高温的原因是进气预热装置短路。该叉车电气系统装配完成后,启动开关处于OFF挡位,并未启动预热装置,由此怀疑进气预热装置线束存在故障。2.预热控制原理进气预热装置线束连接方式如附图所示。当启动开关由OFF挡切换为Ⅲ挡(预热)时,启动开关
1. Symptoms and causes 1 Taiwan equipped with YT484-24 engine sF50x forklift vehicle assembly is completed and connected to the power supply, the engine has not been started, the air inlet will suddenly appear high temperature, the intake hose burned out . The engine is not started, you can rule out the possibility of engine failure itself. Inspection found that the engine inlet high temperature is due to intake preheater short circuit. After the electrical system of the forklift is assembled, the start switch is in the OFF position, and the preheating device is not started. Therefore, it is suspected that the intake air preheating device harness is faulty. 2. Preheat control principle Intake air preheater wiring harness connection as shown in the figure. When the starting switch is switched from OFF to III (preheating), the switch is activated