I just purchased a utlitech 1/2 hp convertible jet pump. When I turn it on it just hums.

https://www.amazon.com/Pump-Replacement-Parts/b?ie=UTF8&node=10425164011

Look on the id plate on the motor, and inside the cover on the back and inside the switch cover.

It sounds like it is seized with the overload relay cycling it to save the motor. It needs to be dismantled, cleaned and possibly rebuilt. Check the price of a new one it may be cheaper.

Hi Eglenni,

Here are the specs for your pump:

Thermoplastic Shallow Well Jet Pump 3/4 HP. This new revision of an "old hand" provides good pressure pumping from wells where the depth-to-water is 25' or less.

BODY CONSTRUCTION: Thermoplastic
HORSEPOWER: 3/4
MAXIMUM CAPACITY: 12 GPM
FLOW at 10' LIFT and 40 PSI: 9.7 GPM
MAX LIFT: 25'
MAXIMUM PRESSURE: 78 psi
PRESSURE SWITCH SETTING: 30/50
SUCTION PIPE SIZE: 1-1/4" NPT
DISCHARGE PIPE SIZE: 1" NPT
AMP DRAW (full load): 6.1 amps on 230v / 12.2 amps on 115v
VOLTAGE: 230v / 115v, 60 Hz
RECOMMENDED BREAKER: 15 amp on 230v / 20 amp on 115v
MAXIMUM WATER TEMPERATURE: 140 °F (60 °C)
=========================================
Note that this pump can be operated at 115 volts or 230 volts (A/C) It may have come wired for 230 volt use from the vendor.

Make sure the pump is piped correctly.

There should be a wiring diagram either on the pump or in the literature so you can check to see how the pump is wired.

MAKE SURE you have the pump wired for 115 volt use in your case. Also make sure the wire size is #12 awg for the power wiring.
Make sure all connections are tight. If you have an amprobe (an instrument that measures electric current) you can check to see how many amps the pump is pulling when it runs.

You said your old pump was 1 HP. This Flotec pump is 3/4 horse so there could be some pump performance loss depending on the well depth and length of the piping runs.

Here's the link to the website for the pump. There are additional resources available on the website:

Thermoplastic Shallow Well Jet Pump 3 4 HP

The voltage is not optional. What voltage are you plugging the pump into?
If you are plugging it into 115, the pump must be set for 115.
If you are plugging it into 230, the pump must be set for 230.
Usually there is a wiring diagram on the label on the pump body or if you remove the end cover, there may be instructions there. There may even be a switch or terminal that states 115 volts and another that states 230 volts.
Gary

What do you mean "...not go on properly..."? When moving from the 230 to the 115 both terminals inside the plastic selector device should then be on a spade connector on the motor terminal board. Is one of the posts bent? Without the proper connection of the 2 posts the unit will not run. I hope it is a simple as that.

If not your next step should be to contact the store it was purchased from or Hayward's chain of service centers to get it remedied. You can find a service center on Hayward's site here. Enter your zip code and further down the page select service from the list of choices.

John

could be but more likely the centrifugal switch is not turning on the run windings in the motor

check the face of the jet trim to make sure it is turned on. most jets today turn clockwise and counter clockwise to turn the water on/off on each jet.

Be sure you have connected the motor to the line leads correctly and that the motor is set for the proper line voltage.

A somewhat common problem is that most motors are dual voltage (can be ran on 115 or 230 volt) and come factory set for 230 volts. If you connect it to a 115 volt circuit it will run for a while and then overheat and shut off.

The motor should have a diagram on it showing where line 1 & 2 go. It does not matter which of your two line wire goes to which post, as long as you put one wire per post and have the motor set for the correct incoming voltage, you'll be fine.