- Joined
- Mar 6, 2015
- Messages
- 14
Harbor Freight tools rate their motors using Shetland Ponies as their horses of choice, not Clydesdales.
Be careful trying to replace your motor with a NEMA (American) sized replacement motor.
The original motor is METRIC sized (frame size currently eludes me), a Nema 56 frame motor has a 5/8" shaft and a Nema 48 frame is 1/2"diameter.
Harbor Freight motors are something like .550" or so (not quite 9/16") so your pulleys won't swap without a sleeved bushing inside it or turning down the 5/8" rotor of the 56 frame one.
Also the mounting bolts are completely in the wrong spot for easy swapping, but this is a machinists website after all so it should be easily remedied.
I believe these are a Capacitor RUN motor, NOT capacitor Start, so as someone else mentioned it might be bad and causing you grief.
The 138* temperature is normal for an electric motor under a load. I didn't see a spec on the nameplate you posted, but MOST motors have a "Temperature Rise of 40*C" (CENTRIGADE) which is 104* F.
You add the Temp. Rise to the Ambient (Air) temperature and you get the average working temperature of the motor.
Some motors actually have a 50*C rating (they get hot enough to fry an egg on but are fairly uncommon in use).
Good Luck
Tommy
Be careful trying to replace your motor with a NEMA (American) sized replacement motor.
The original motor is METRIC sized (frame size currently eludes me), a Nema 56 frame motor has a 5/8" shaft and a Nema 48 frame is 1/2"diameter.
Harbor Freight motors are something like .550" or so (not quite 9/16") so your pulleys won't swap without a sleeved bushing inside it or turning down the 5/8" rotor of the 56 frame one.
Also the mounting bolts are completely in the wrong spot for easy swapping, but this is a machinists website after all so it should be easily remedied.
I believe these are a Capacitor RUN motor, NOT capacitor Start, so as someone else mentioned it might be bad and causing you grief.
The 138* temperature is normal for an electric motor under a load. I didn't see a spec on the nameplate you posted, but MOST motors have a "Temperature Rise of 40*C" (CENTRIGADE) which is 104* F.
You add the Temp. Rise to the Ambient (Air) temperature and you get the average working temperature of the motor.
Some motors actually have a 50*C rating (they get hot enough to fry an egg on but are fairly uncommon in use).
Good Luck
Tommy