10
e.
Abnormal end thrust.
f.
Dirt in bearings.
g.
Excessive belt tension.
4. OVERLOAD ON MOTOR
a.
Speed too high.
b.
Fan over capacity due to existing system resistance being lower than original rating.
c.
Specific gravity or density of gas above design value.
d.
Wrong direction of wheel rotation.
e.
Shaft bent.
f.
Poor belt alignment.
g.
Wheel wedging or binding on fan housing.
h.
Bearings improperly lubricated.
i.
Motor improperly wired.
j.
Defective motor. Motor must be tested by motor manufacturer’s authorized repair shop.
