Fault finding and repair of coolant pump?

Question

Hi, im abit stuck with my college work, its about findind a fault in a lathe machine(coolant pump which is noisy and isnt working sufficently) and repairing it, its known as fault diagnoisis(or fault finding), any little advice or info to help ????
and i need the work in by monday

Answer 1

Just a correction to the previous answer. Cavitation is not caused by trapped air. Cavitation occurs when the pressure inside the pump at any place, usually on the rear of the impeller blades, falls below the vapour pressure of the liquid, and liquid vapour bubbles form and then collapse as they enter a higher pressure region. This forming and collapse of bubbles makes noise and can cause erosion of the blades or the pump housing. Solution can be to slow the pump rotation, increase the inlet pressure, or constrict the discharge flow. Air purging will definitely not correct the problem. As to your initial problem, check first for restrictions in the supply line, then for damaged bearings which might be noisy. You will need to remove and strip the pump to check for any damage caused by cavitation, (pock marked surfaces) or for worn bearings. Depending on the pump type, operating clearances should be checked. Check any in line filter on the supply line for blockage. This is a very likely source of both cavitation and low flow.

Answer 2

noise and insufficient flow from a pump are normally caused by cavitation within the pump, Cavitation is when there is air trapped within the pump so the liquid being pumped doesn't flow as much. cavitation also causes overheating and can damage the pump if left unrectified.

as cavitation is caused by trapped air the solution is relatively easy, simply purge the air from the pump.

Answer 3

Are the drive shaft seals ok is the pump gears worn or is there a leak in the suction pipe or in the output pipe is the pump belt driven are the belts and adjustment ok ~~

Answer 4

Call the manufacturer of the machine and ask them. They probably can answer your question right away.

Answer 5

I agree with Peter completely on this.. Doug is talking drivel