INDCO, Inc.
M-M-30118 mixer manual HS-5
date: 3/8/05
Problem or Complaint
Motor runs fine when
no load
is
applied. When
loaded
, it loses
power and tries to stall.
Motor
shocks
the user when they
touch it.
Exterior of electric motor is rust-
ing.
Electric motor (or whole mixer)
appears to vibrate at more than
normal levels.
Possible Cause
1. If motor is
new
, see above under possible overload situation, or
possible bad motor.
2. If motor is
older
, and motor is
AC
, then it is probably worn out or
in need of rebuilding.
3. If motor is
older
, and motor is
DC
, then it probably needs new
brushes. Brushes are present in all DC motors. (AC motors do not
have brushes).
1. Motor ground is faulty. If motor is
new
, then the grounding wire
was not secured adequately. If the motor is
older
, the ground wire
has probably worn or shaken loose.
1. If the paint has chipped or worn off of the motor, this is normal.
Much of the electric motor body is either cast iron or steel. The
paint used by most motor manufacturers is a epoxy-base or lac-
quer-base, which are pretty durable, but they could eventually come
off.
1. If report of problem is seen
primarily at a specific speed or
within a specific speed range,
it could be the normal
harmonic
frequency vibration
that is integral to any machine. Basically, ALL
rotating parts have a fairly specific point at which they will
not
rotate
smoothly…that is, without
some level
of vibration. There is going to
be an RPM (or fairly narrow RPM range) where you will notice an
increase in vibration. This is even more common to witness on
variable speed
mixers. It is also much more pronounced when run-
ning the mixer dry (out of liquid, in free air).
2. Could be a bad
chuck
or
coupler
attached to the motor, could be
a
bent mixing shaft
, or could be a
propeller or blade
which needs
to be balanced better.
3. Possible that
motor shaft
is bent. Would probably only happen
if motor was brand new would have taken a blow during shipping to
bend it, or dropped.
Remedy
1. Repair as mentioned previously, or examine customer
application more closely.
2. Replace motor.
NOTE:
INDCO cannot
rebuild
elec-
tric motors, although it can be done. If customer wants
to pursue this, they can check their local Yellow Pages
under “Electric Motor Repair” . Alternately, we can refer
them to a factory-authorized repair facility if we have the
brand name of the motor.
3. Replace brushes. Inspect brush holders while ser-
vicing, they wear with time as well.
1. Repair or reattach ground wire, or replace cord if nec-
essary.
1. Clean or buff rust off, and re-paint the motor (if it is a
problem). If it
IS
a serious problem, consider an
ALL-
STAINLESS
motor.
1. DO NOT OPERATE A MIXER WITH THE SHAFT &
IMPELLER OUT OF LIQUID! Damage to motor, shaft,
bearings, etc. will result! If vibration is distressing, and
mixer is variable speed, try to avoid the rather small
“band” of the speed range at which the most vibration is
seen (basically, operate mixer at either higher or lower
speeds than the higher-vibration “band”).
2. Replace the faulty part. Test to see if shaft is bent by
removing and rolling it across a flat table or floor. Chuck
or coupler
could
be visibly off-center or wobbling. May
have to switch out parts until problem is solved.
3. Replace motor (probably out of the question to at-
tempt repair).
Electric Motor - Troubleshooting
(continued)
page 9 of 11
