故障一：真空压力表的指针剧烈跳动，泵噪声振动大。
发生汽蚀。
1、吸入管路不密封，有空气渗入
检查吸入管路的各连接处，拧紧螺母或更换已损坏的垫片
2、进口过滤器堵塞或吸入管路有阻碍物
清洗过滤器或消除阻碍物
3、介质粘度太大
提高介质温度，使粘度下降，或更换介质
4、泵转速高
降低转速
5、泵排出回流入油箱内的介质所混入的空气未很好排除，随介质一起吸入泵内
检查油箱内是否有钻许多孔的隔离挡板和挡板是否完好，或对介质升温，使空气易从介质内上浮排离
HSN三螺杆泵部分备件名称及对应英文：
泵体pump body
平键flat key
衬套bush
底座bottomblock
前端盖front end lid
后端盖rear end lid
安全阀safety valve
密封圈sealing washer
主动螺杆main pole
从动螺杆subordinate pole
机械密封mechanical seal
滚动轴承rolling bearing
滑动轴承sliding bearing
机械密封座mechanical seal vasher
HSNH系列三螺杆泵常规型号：
HSNH40-38 HSNH40-46 HSNH40-54 HSNH80-36 HSNH80-42
HSNH80-46 HSNH80-54 HSNHnbsp; HSNHnbsp; HSNH120-51
HSNHnbsp; HSNHnbsp; HSNHnbsp; HSNHnbsp; HSNH280-43
HSNHnbsp; HSNHnbsp; HSNHnbsp; HSNHnbsp; HSNH440-52
HSNHnbsp; HSNHnbsp; HSNHnbsp; HSNHnbsp; HSNH660-51
HSNHnbsp; HSNHnbsp; HSNHnbsp; HSNHnbsp; HSNHnbsp;
HSNHnbsp; HSNHnbsp;HSNHnbsp;HSNHnbsp;HSNH
HSNHnbsp;HSNHnbsp;HSNHnbsp;HSNHnbsp;HSNHnbsp;
HSNHnbsp;HSNHnbsp;HSNHnbsp;HSNHnbsp;HSNHnbsp;
HSNHnbsp;HSNHnbsp;HSNHnbsp;HSNH
轴承内置型号：
HSNH40-38N HSNH40-46N HSNH40-54N HSNH80-36N HSNH80-42N
HSNH80-46N HSNH80-54N HSNH120-42N HSNH120-46N HSNH120-51N
HSNH120-54N HSNH210-40N HSNH210-46N HSNH210-54N HSNH280-43N
HSNH280-46N HSNH280-54N HSNH440-40N HSNH440-46N HSNH440-52N
HSNH440-54N HSNH660-40N HSNH660-44N HSNH660-46N HSNH660-51N
HSNH660-54N HSNH940-36N HSNH940-42N HSNH940-46N HSNH940-50N
HSNH940-54N HSNHN HSNHN HSNHN HSNHN
HSNHN HSNHN HSNHN HSNHN HSNHN
HSNHN HSNHN HSNHN HSNHN HSNHN
HSNHN HSNHN HSNHN HSNHN
进出口反向安装型号：
HSNH40-38Z HSNH40-46Z HSNH40-54Z HSNH80-36Z HSNH80-42Z
HSNH80-46Z HSNH80-54Z HSNH120-42Z HSNH120-46Z HSNH120-51Z
HSNH120-54Z HSNH210-40Z HSNH210-46Z HSNH210-54Z HSNH280-43Z
HSNH280-46Z HSNH280-54Z HSNH440-40Z HSNH440-46Z HSNH440-52Z
HSNH440-54Z HSNH660-40Z HSNH660-44Z HSNH660-46Z HSNH660-51Z
HSNH660-54Z HSNH940-36Z HSNH940-42Z HSNH940-46Z HSNH940-50Z
HSNH940-54Z HSNHZ HSNHZ HSNHZ HSNHZ
HSNHZ HSNHZ HSNHZ HSNHZ HSNHZ
HSNHZ HSNHZ HSNHZ HSNHZ HSNHZ
HSNHZ HSNHZ HSNHZ HSNHZ
轴承外置型号：
HSNH40-38W1 HSNH40-46W1 HSNH40-54W1 HSNH80-36W1 HSNH80-42W1
HSNH80-46W1 HSNH80-54W1 HSNH120-42W1 HSNH120-46W1 HSNH120-51W1
HSNH120-54W1 HSNH210-40W1 HSNH210-46W1 HSNH210-54W1 HSNH280-43W1
HSNH280-46W1 HSNH280-54W1 HSNH440-40W1 HSNH440-46W1 HSNH440-52W1
HSNH440-54W1 HSNH660-40W1 HSNH660-44W1 HSNH660-46W1 HSNH660-51W1
HSNH660-54W1 HSNH940-36W1 HSNH940-42W1 HSNH940-46W1 HSNH940-50W1
HSNH940-54W1 HSNHW1 HSNHW1 HSNHW1 HSNHW1
HSNHW1 HSNHW1 HSNHW1 HSNHW1 HSNHW1
HSNHW1 HSNHW1 HSNHW1 HSNHW1 HSNHW1
HSNHW1 HSNHW1 HSNHW1 HSNHW1