Pump did not intake water 

  Reason: 
    1. turning wrong or impeller damage
    2.suction pipe plug 
  Solution:
    1.checking turning , and renewal impeller 
    2.exclude plug 
The shaft power is too big 
  Reason:
    1. friction occurred in pump  
    2. damage the bearing 
    3. belt is tie for driving device 
    4. pumping capacity is too big 
    5. rotate speed is too high , medium specific gravity is great 
    6. motor shaft is not parallel to motor shaft , or they are misalignment . 
 Solution:
    1.dispel the friction 
    2.change bearing 
    3.adjust belt 
    4.adjust the pumps operation condition 
    5.adjust rotate speed 
    6.adjust motor shaft and pump shaft 
Bearing is overheating 
 Reason:
    1.too much or too little grease for bearing 
    2.grease in debris 
    3.bearing damage 
 Solution:
    1.add appropriate grease 
    2.renewal grease 
    3.renewal bearings 
Bearing life is short 
  Reasons:
    1.Motor shaft and pump shaft are misalignment , or they are not parallel 
    2.bearing is bend . 
    3.friction within pump or impeller lost balance 
    4.foreign matter went into bearing or the quantity of grease is not reasonable 
  Solution:
    1.adjust motor shaft and pump shaft 
    2.renewal shaft 
    3.Eliminate friction , renewal impeller 
    4.cleaning bearings 
    5.renewal bearing or assemble bearing again . 
Pump vibration , big noise 
   Reason: 
    1.bearing damage 
    2.impeller is imbalance 
    3.the flow is not uniform and the pump is empty 
   Solution: 
    1.renewal bearing 
    2.renewal impeller 
    3.improve the pump feed