Pump Motors
27
Level 2
A.O.Smith
START SWITCH CHECK
■
Visual checks:
•
Disconnect power source.
•
Remove canopy.
■
Make sure there are no obstructions preventing
the proper operation of the rotating governor.
Check wiring and make sure none of the leads
are in the area of the governor where they can
be cut or interfere with the governor. Check
governor for proper operation and make sure
flipper is free to move.
■
Check switch contacts for severely burned or
pitted contacts, sticking etc. Some blackening
or pitting is normal after motor has been used.
Replace switch if there is any doubt. Don’t try
to repair by bending the contact leaf.
■
Unlike points in an automotive distributor, the
switch contacts in motors are plated and should
never be sanded which would remove the plat-
ing and cause early failure. They may be
cleaned by wiping with a piece of cardboard or
paper bag.
■
Reconnect power.
■
Start motor. Visually check the action of the
switch and governor. Switch contacts must be
closed when motor is at rest and should open
when motor reaches about 2/3 of full load
speed.
START SWITCH ADJUSTMENT
■
Fasten switch snugly to end bell, through “U”
bracket with the screw provided.
■
A slight amount of switch movement is possible
before the screw(s) is tightened. Check to see
that the white switch button is centered over
the governor projection.
■
Reach in and move the governor weight (over-
coming the spring tension) until it touches the
stops on the governor.
•
The clearance between the projection
and the white button should be .010”
to .040” (.040 is about the thickness of
paper clip wire).
NOTE: Replace capac-
itor and switch at the
same time. A defective
switch usually stresses
the start capacitor.
