Question about Tsurumi Pump s Submersible Water Pump 3810 GPH 12 HP 2in Model LB48
This is a single phase induction motor. You mentioned it is overheating. You did not mention whether or not you had easily turned the pump by hand. Pumps overheat for several reasons but these are the top 4:
1. The head pressure is too high as in the pump is being used to pump water higher than the head level of the pump. (Lift distance to high)
2. Low utility or generator voltage. Lower than the pump rated input power requirements.
3. Bearing Friction or motor / bearing mis-alignment ( 3. Pump is sitting in debris while pumping and the pump inlet is being blocked by debris. Also... if it sat in clay and the clay dried inside the pump it can restrict water passages to the point that the pump just can not pump enough water to stay cool.
Does it overheat when pumping at 15 feet or less? I note that this is actually a 1/2 Hp pump. The max LIFT distance for most 1/2 Hp Pumps is 23 feet or less using a 1 1/2 in discharge. The lift will be even less with a 2 inch discharge outlet. As for oiling the pump... Most submersibles always have oil above the impeller and it usually does NOT leak out unless the seal between the impeller and the motor stator / aramture has failed letting water into the winding. That plug you mentioned is for checking to see if water is in the winding area. If you pull the plug and get water the seal is bad. Hopefully you can save the winding.
You asked what the effect would be if you went to a larger discharge diameter. This will give you more volume but less head / lift distance.
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Posted on Apr 06, 2011
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Posted on Jan 02, 2017
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