General Information (Main Pump System)
主液压泵包括两个串联连接的可变排量活塞泵。 两个主泵称为前泵和后泵。 发动机通过发动机飞轮的机械连接直接驱动前泵。 泵壳体中的花键轴将旋转功率从前泵传递到后泵。 前泵和后泵的构造和操作完全相同。 前泵和后泵配备有共用充注泵，充注泵位于泵壳体中央。
通过电子控制系统控制前泵和后泵调节器。 泵控制歧管包括两个反向流量控制 PRV 和一个动力换档压力 PRV。 比例减压阀向泵调节器发送液压信号压力，以控制泵的输出流量。 通过改变流向泵调节器的 NFC 和 PSP 信号压力，泵输出流量随之改变。
注: 请参阅本手册中的相应章节，了解更多信息。
Caterpillar Information System:
C3.3B Tier 4 Final Engines for Caterpillar Built Machines Cylinder Block
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