3.5 hp Speedaire bogging till overload on motor trips
60 gal. 3.5 hp Speedaire. bought it used a few years ago as a backup. now I need it and it wont run. Runs great for about 30 sec. then bogs till it eventually trips overload on the motor. Have replace motor, pump, and tank check valve. messed with pressure settings and doesn't change anything. I'm at a loss completely. Tried bypassing pressure switch and does the same thing. Gets up to about 20 psi and starts bogging. Please Help!!!!