793F and 793F CMD Off-Highway Truck Air System Caterpillar


Air Compressor Governor - Test and Adjust

Usage:

793F D3T

------ WARNING! ------

打开排放阀时,请穿戴防护手套、防护面罩、防护衣和防护鞋。

压缩空气可能会将杂质吹出并造成人身伤害。



注意

不要超过830 ± 35 kPa (120 ± 5 psi)空气压力,否则会发生空气系统部件的损坏。


表 1
所需工具    
工具     零件号     零件描述     数量    
A     8T-0849     压力表     1    

调整调节器之前,完成步骤 1 至步骤 8。

  1. 释放气罐中的空气压力。

  1. 将测压口安装在储气罐的排放阀中。

  1. 将工具 (A) 安装在测压口上。

  1. 使用外部气源对空气系统充气。

  1. 起动发动机。

  1. 记录切断调节器时的空气压力。

  1. 反复打开罐放出口,直至空气压力下降并且调节器激活。

  1. 记录接入压力。 如果切断压力不是 837 ± 34 kPa (120 ± 5 psi)并且接入压力不是 655 kPa (95 psi),则调整调节器。



    图 1g02163319

    调节器组件

    注: 调节器组件位于压缩机总成的前部。

  1. 拆下调节器顶部的盖 (1) 。

  1. 松开盖下方调整螺钉的锁紧螺母。

  1. 逆时针转速调整螺钉,以便将切断压力设定值增加至 837 ± 34 kPa (120 ± 5 psi)。 如果需要降低切断压力设定值,则要顺时针转动调整螺钉。

  1. 上紧调整螺钉的锁紧螺母以保持这一调整值。

调整调节器之后,检查切断压力。 如果切断压力没有变化,则检查卸荷阀有无损坏。 如果切断压力与接入压力之间的差值不在技术规范的范围之内,则检查调节器有无损坏。

检查机器上的气压表。 检查安装在一次空气管排放阀内的测试仪表。

起动发动机。 运转发动机,直至达到切断压力。 气压表上的指示必须与测试仪表上的指示相等。 如果差值超过 35 kPa (5 psi),则在机器上安装一个新压力传感器。

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