So the circulating pump on my heating boiler wouldnt go. It kept trying to go then stop- so it was overheating. Shut down the boiler and let it cool- then restarted it, and the pump was making an awful sound. So I shut it off, went and got a new bearing assembly for the pump and put it on. No problems, everything worked- for awhile, then the same thing happens again. Pump gets hot, and shuts down.There is water is the system and I bled any air out.Any ideas from professionals?
need to know what kind of pump that is very important so we can get a better idea where to go. things to look at are the valves open going in and out of that zone,if it has zone valves make sure that they are open temp of water in boiler some pumps are only good to 210 deg f . let me know this should be any easy fix. good luck. ************* i think you have bad bearings in the motor not the pump head pull the motor off and see if spins free and should not have a lot of end play pull on motor shaft front to rear to check end play it should spin very easy make no noise at all the old two piece pumps are not as dependable as the new cartridge style pumps my want to think about upgrading if the old motor is the prob they can be repaired or replaced.you also said you replaced the bearing unit did you seat the seal before you put on the impeller ? some bearing unit the seals are not all the way in that could also be a problem.if these don't work let me know.
If you haven't already go ahead and take a thermal reading of the motor as well as a amp draw on all three legs of power. if the moter is not overheating because of over amp draw, it could be due to a damaged impeller. over time small pits are eroded in the impeller. as well as a buildup of material that unbalances the impeller
Heating System Circulator Pump
What kind of pump is it? Older models, such as the red BG ones, need to be lubricated once a season. There are tubes at the front and rear of the motors and the pump bearings for this. Often a loud noise is caused by a broken coupling which is fairly easy to replace. There are a few possibilities: The motor bearings might need lubrication and are binding, causing the motor to overheat. The pump assembly could be binding, causing both motor overheating and coupling failure. If it's a newer type (Taco or similar) the bearings are sealed and cannot be lubricated. If the unit is older, and lubrication doesn't help, it might be time to replace the whole thing. You can replace a BG with a Taco. They last a long time and tend to be quieter. peace
