What Should I Do If The Fire Fighting Pump Doesn't Suck Water

May 22, 2025

The speed of the fire pump is too low
(1) Human factors. A considerable number of users, due to the damage of the original motor, randomly installed another motor to drive the fire pump, resulting in low flow rate, low head, and even inability to pump water.
(2) The drive belt is worn. Many large fire pumps use belt transmission, but due to long-term use, the transmission belt may become loose and slip, resulting in a decrease in the speed of the fire pump.
(3) Improper installation. The center distance between the two pulleys is too small or the two shafts are not very parallel, the tight edge of the fire pump drive belt is installed on top, resulting in a small wrap angle, errors in the calculation of the diameters of the two pulleys, and a large eccentricity between the two shafts of the fire pump in the coupled transmission, all of which can cause changes in the speed of the fire pump.
(4) Mechanical failure of the fire pump itself. Loosening of the fastening nut between the impeller and the pump shaft or deformation and bending of the pump shaft can cause excessive movement of the impeller, direct friction with the pump body, or damage to the bearings, all of which may reduce the speed of the fire pump.
(5) Improper maintenance of the fire pump power machine. The motor loses magnetism due to winding burnout, and changes in winding turns, wire diameter, and wiring methods during maintenance, as well as incomplete troubleshooting of fire pumps or other factors during maintenance, can also cause changes in the speed of the fire pump.