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700-92-34000-YA CONTROL VALVE1、挖掘机在冬季起动为什么困难？不仅决定于本身的技术状况，还受外界气温的影响。冬季低温下起动更困难，主要是由如下原因所致：
⑴冬季气候寒冷，环境温度低，机油粘度增大，各运动机件的摩擦阻力增加，使起动转速降低，难以起动。
⑵蓄电池容量随温度下降而减少，使起动转速进一步降低。
⑶由于起动转速降低，压缩空气渗漏增多，气缸壁散热量增大，致使压缩终了时空气的温度和压力大为降低，使柴油发火的延迟期增长，严重时甚至不能燃烧。

⑷低温下的柴油粘度增大，使喷射速度降低，加上空气在压缩终了时的旋流速度、温度和压力都比较低，使喷入气缸的柴油雾化质量差，难以与空气迅速形成良好的可燃气体并及时发火燃烧，甚至不能着火，导致起动困难。

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19N-69-11140公司致力于提供小松PC56-PC450系列零部件，产品保障。旨在为广大用户提供质优的小松挖掘机配件。
我公司主要经营小松挖掘机PC56-7、PC60-7、PC110/PC130-7、PC200/220/240-6-7-8、PC300/360-6-7-8、PC400/450-6-7的各种结构件，主要有四轮一带、销轴、衬套、铲斗、大小臂、燃油箱、覆盖件、驾驶室、座椅、涨紧装置总成、铲斗油缸、斗杆油缸、动臂油缸、电器件、液压件、发动机件等各种小松配件。如有产品上传不详细的都可以联在线客服，大小机型的详细配件都提供