Treadmill smells HOT HOT HOT

Temperature Rise - Today's 'HOT' AC Motors
During the reign of the Class "A" insulated U-frame motors, it was common practice to determine
whether a motor was running all right by simply placing your hand on it. If the motor was "too hot to
touch", it was overheating. With the advent of T-frame motors and the high temperature insulation that
made them possible, this old "rule of thumb" is no longer valid. Surface (Skin) temperatures usually
run 20 to 30°C lower than the temperature at the windings. Subtracting 30C from a 'Class F' insulated
motor whose total allowable running temperature is 155°C, results in a skin temperature of 125°C
(257F), therefore if your T-frame motor is "too hot to touch", it does not necessarily mean that its
operating improperly. Today's motors are designed to run hotter than our human hands can tolerate.
NEMA specifies letter designations for motor insulation temperature ratings. These insulation
temperature ratings are denoted as Class: A=105°C, B=130°C, F=155°C, and H=180°C. Further,
NEMA specifies allowable temperature rises for motors at full load (and at service factor, if
applicable). These allowable temperature rises are based upon a reference ambient temperature of
40°C, and are determined by the "resistance method", in which the resistance of the windings is
measured with a bridge after the motor has achieved thermal equilibrium under load. The resistance of
the winding is a function of temperature of the winding. NEMA allowable temperature rises (at full
load) for a 1.0 S.F. motor are A=60°C, B=80°C, F=105°C, and H=125°C. NEMA allowable
temperature rises (at service factor) for a 1.15 S.F. motor are A=70°C, B=90°C, and F=115°C.
Adding the NEMA allowable temperature rise of 105°C (for a Class F insulated, 1.0 S.F. motor), to the
reference ambient temperature of 40°C, results in a total operating temperature for the motor of
(105+40)=145°C. The 10°C temperature differential between the Class F insulation maximum
temperature rating (155°C) and the allowable maximum temperature (145°C) provides an allowance for
the "hotspot" temperature of the interior of the winding, which is difficult to measure directly. The
overall winding resistance is the sum of the resistance of the cooler end turns, and the warmer (hot
spot) windings embedded in the stator slots.
http://toshont.com/ag/mtrldesign/AG05%20(Temperature%20Rise).pdf

Start by lubing your deck with a silicone oil or slipcoat