Do little giant pumps turn themselves off when overheated

[Jyetman]

Do the Little Giant 4 MDQ-SC pumps shut off when too hot? That is what the thermal protection means right?

 

[fletch999]

Not sure but mine runs hot to touch. You cant keep your hand on it for more then 3-5 secs, been like this for 2 years. I make sure nothing is touching it. But yes I assume that is what it means.

 

[Jyetman]

Same here 2.5 years and can't keep a finger on it for more then 3 seconds. Its good to know must be normal for heavy loads.

 

[byee]

I had a 3 series for 8+ years and it always ran hot like your. 4 series.

I installed 2 fans to keep it cool.

You may want to consider this just to keep the pump cool.

Good luck!

 

[tkeracer619]

The problem with hot pumps is calcification inside the pump housing and excessive wear to the motor. Put a fan on it... I've zip tied heat sinks with thermal past to the outiside of little giants :lol:

 

[Jyetman]

The problem with hot pumps is calcification inside the pump housing and excessive wear to the motor. Put a fan on it... I've zip tied heat sinks with thermal past to the outiside of little giants :lol:

What kind of heat sinks did you use like from computers? I'm afraid the zip ties would melt?

 

[tkeracer619]

I used something like this, hit them with a propane torch, and bent them around a pipe that was the same diameter of the motor. I did it with 8 of them. Worked like a charm.

http://www.digikey.com/product-detail/en/VHS-95/102-1489-ND/1016697

If you add enough the motor won't get hot enough to melt the zip ties

 

[reefgeezer]

I have an old Little Giant I keep around just for back-up. I replaced it as my recirc pump because it started to run hot even after being cleaned and oiled. It has over-heat protection and would shut off until it cooled.