Issues with an older Iwaki RLT4

reefknight · 02/16/2015, 10:02 PM

I have an older RLT40 , probably 15yrs old. Pump was only used for maybe 1.5-2yrs and lightly at that. Either way the pump is now making a loud growling noise, and is not really pushing any water. I have it installed as a recirculating pump on my salt mixing station. I have cleaned the pump well, but it still is not operating. Now if I remove the front and rear casing, o-ring and impeller and plug it in it hums along nicely without any noise. My thought is that the bearings are shot in the front/rear casings and should be replaced. Correct? Also can anyone verify whether or not the shaft in the impeller should spin freely or not? Its been so long I cannot recall.

Any thoughts would be appreciated, thanks!

02/16/2015, 10:02 PM	#1
reefknight Registered Member Join Date: Jan 2006 Location: Warner Robins, GA Posts: 626	Issues with an older Iwaki RLT4 I have an older RLT40 , probably 15yrs old. Pump was only used for maybe 1.5-2yrs and lightly at that. Either way the pump is now making a loud growling noise, and is not really pushing any water. I have it installed as a recirculating pump on my salt mixing station. I have cleaned the pump well, but it still is not operating. Now if I remove the front and rear casing, o-ring and impeller and plug it in it hums along nicely without any noise. My thought is that the bearings are shot in the front/rear casings and should be replaced. Correct? Also can anyone verify whether or not the shaft in the impeller should spin freely or not? Its been so long I cannot recall. Any thoughts would be appreciated, thanks! __________________ Bill Current Tank Info: DSA Neo 185gal - Coming Soon!