Carrier 4 ton central air conditioner works when first turned on then fan stops,but compressor continues to run.( New fan motor and capisator )

Dear friend! It's not lubrication problem. All motors pre-lubricated.Weaken capacitor. Replace capacitor immediately. Don't practice to spin with screw driver. It's not safety.Thanks.

if all is as you say you probably have a bad "dual motor run capacitor"

it sounds like the capacitor is shot there is usually a duel capacitor one side is for the compressor and the other side is for the condensor fan motor if it is bad the motor will over heat and turn off on internal overload

probably a bad dual motor run capacitor

My first guess would be the capasitor too..

If you have a tester - see if there is power getting to the fan motor..

If its getting power - it should be a faulty fan motor..

Hope this helps !!
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cap usually mounted to blower housing with power off turn blower wheel if rough bad brown wires from motor should lead to cap if replacing motor get new mount belly band also and make sure rotation is correct reversable motor hope this helps

check fan rotation

The compressor may be fine after setting off or a day. After retyring it then if it still dosnt start either replace the run capacitor to the compressor and fan motor or have it checked to see if it is in range.

The hum your hearing could that be the contactor relay humming?

I am assuming that you are talking about a central ac unit. On a central air unit the outside fan must be running whenever the compressor is. If it's not the compressor will shut off from overheating withing minutes. First you need to shut off the unit for several hours and let it cool completely down. Then turn it on briefly to see if the compressor starts and see if the fan tries to start.( I am assuming the compressor starts and runs.) If the fan won't start try testing the capacitors. There are usually two one for the fan one for the compressor. Sometimes there will be one combo one. Mark the wires and remove the capacitor. Get it tested and if bad replace it. This will probably do the job. If not test for current at the fan motor. Also test to see if it turns freely. The motor may need to be replaced. This will run about $50. The capacitor should always be replaced when the motor is changed anyway.

Turn the power to the indoor unit off. Remove the cover where the fan is. Feel the motor of the fan. If it is very hot the bearings have likely gone out. If the fan is cool to the touch I would call a service company because you likely have an electrical problem that will require some training to solve.