KitchenAid K5-A Service Instructions Manual page 29

Trouble
MIXER RUNS WITH JERKY
CLATTERING NOISE ON
LOW SPEED
LOUD RUMBLING NOISE
MIXER RUNS BUT WILL
NOT COME UP TO HIGH
SPEED. HAS POWER BUT
LABORS AND USES
EXCESSIVE WATTS
MIXER WILL NOT
SHUT OFF WITH
SWITCH KNOB
SWITCH KNOB CLICKS BUT
MIXER WILL NOT RUN
OR BUZZ
ELECTRICAL SHOCK TO
OPERATOR
MIXER WILL NOT RUN AL-
THOUGH SWITCH CLICKS
AND MOTOR BUZZES
28
Possible Cause
Loose connection from center top of
resistor to control plate (two black
leads) .
Tight bearing.
Ball in end of armature shaft worn
or flat.
Worn thru st ball bearing.
Tight bearing if no smoke is apparent.
Burned out armature if rriixer smokes.
Toggle switch not correctly adjusted
with control link and cam assembly.
Open electrical circuit.
Bare lead touching inside of housing.
Frozen bearing.
Remedy
Check this connection to make certain it
is not loose.
First check the bearing in th e planetary
beater shaft. If the bearing can be easily
moved with a back-and-forth twisting
effort, it is satisfactory. If it binds, re-
move the planetary and recheck the
mixer. If the mixer still uses excessive
watts, it mu st be disassem bled and the
other bearings checked.
Disassemble the motor and replace the
ball.
Remove the gears from the gear case
and the armature from the motor hous-
ing, then replace the thrust ball bearing.
First check the bearing in the planetary
beater shaft. If the bearing can be easily
moved with a back-and-forth twisting
effort, it is satisfactory. If it binds, re-
move the planetary and recheck the
mixer. If the mixer still uses excessive
watts, it must be disassembled and the
other bearings checked.
Disassemble the motor and replace the
armature assembly.
Remove trim and turn the switch hex
nuts until toggle switch arm properly
engages point on control cam.
Progressively disassemble the speed con-
trol mechanism and motor and perform
the following checks until the open cir-
cuit is found:
Faulty plug.
Faulty attachment cord .
Bad connection in speed control mechanism.
Faulty speed control plate.
Bad connection to toggle switch.
Wire lead clip detached from brush holder.
Bad connection between field and cord.
Open-circuited armature.
Open-circuited field.
Pull the plug, turn the switch on and
check for a ground with a test lamp.
Touch one prong of the test lamp to a
prong of the plug and the other prong to
an unpainted spot on the housing. If the
lamp lights the mixer is grounded. Ex-
amine all the wiring in the order of its
accessibility until the grounded lead is
found. If mixer has radio interference
condenser wired between stator screw and
power cord, remove and discard.
Examine all the bearings in the order
of their accessibility until the frozen
bearing is found.