Condenser fan motor keeps cutting off after 45 minutes of running

[hvacsolutions]

My friend has an old lennox unit, I just replaced the fan motor with a new one and it shuts off after about 45 minutes. The compressor keeps running but eventually shuts off. Whats going on? The only difference between the old motor and the new motor is that the old was a 1/2 hp and the new is 3/4 hp, and the motor dataplate says something about ambient 40* and the new one says ambient 60*. Dayton motor

[stonewallred]

think this is the wrong forum.
but are the rpms the same?
is the rotation the same?
is the blade centered on the shroud properly?
why did you change motors in the first place?

[hvacsolutions]

Hey Stonwallred everything is the same on the motor except the hp and the ambient temp on the motor. Would the hp have something to do with it?

[hvacsolutions]

it's a 36 year old unit would it be sensitive to additional amperage draw on a higher hp motor?

[Captain Cold]

Should probably read the instructions first. Like the ones in red at the top of this forum