[HayZee518]

two pumps may be used you werent specific. a fully submersible pump is sealed with a mineral oil inside for cooling and lubrication. the effluent flows through the passage to cool the motor. if this mineral oil leaks out, the lubrication factor goes down and the motor windings start to heat up. normally there is a ceramic/carbon seal between the motor shaft and the pump. A pedestal type sump pump has a long shaft that connects the motor to the pump body. impeller to housing clearances are close but not air-tight. sand getting in between the seal and housing will have a detrimental effect [ a grinding] and will compromise the seal. if you can get hold of an amprobe, check the motor current read against the motor nameplate current. this will give you an indication of whether its gonna be out to lunch in a short time.