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Motor Drive Unit
The motor drive housing can be cleaned period-
ically with a mild detergent. Never use solvents
to clean the unit or accessories. While resistant
to most laboratory chemicals, care should be tak-
en to wipe off any concentrated and potentially
damaging liquids.
Once per month the aluminum coupling adapter
(see figure to right) of the homogenizer should
be removed and cleaned. After cleaning, a good
lubricant should be applied to the threads.
Motor Brush Maintenance
To a large measure, how well your homogenizer
performs its job is determined by the condition
of the carbon contact brushes (P/N 61810). If
brushes require replacement, the unit may run
at a reduced speed and make unusual noises,
or it may run sporadically and lose power. If this
occurs with your Omni Mixer or Omni Macro,
unplug the cord, loosen the brush caps one at
a time and check each brush. If the brushes are
less than 1/8" long and the ends of the brushes
(which contact the commutator) are rough and/
or pitted, the brushes no longer make adequate
contact with the commutator and should be re-
placed (check both brushes since both brushes
generally do not wear at the same rate). If one
brush is worn replace both brushes. Make sure
that the brushes are installed properly. The
brushes have a curved surface at the end which
must match the curvature of the commutator.
The curvature of the commutator is the same as
the curvature of the motor housing.
If the brushes are not installed properly they will
not contact the commutator and the motor will
not run. After replacing the brushes, make sure
to remove the flexible rubber coupling, place the
motor on a clean surface, and run it freely (no-
load, without a generator or chamber assembly
attached) for 15 to 30 minutes before using
the unit to process samples. This will allow the
brushes to "seat" properly and will extend the
life of each set of brushes. This will also extend
the total life of your motor since the commutator
surface will wear evenly.
Maintenance
Removal of
Aluminum Coupling
In the event that the motor drive connect and/
or the flexible rubber coupling needs to be ser-
viced or replaced, the aluminum coupling can
be removed using the following procedure:
1.
2.
3.
Installation of the coupling is the reverse of
these steps.
Bearings and Lubrication
Motors are equipped with sealed ball bearings.
Under normal use they require no additional lu-
brication. A tube of lubricant (P/N 61971) is in-
cluded with every drive unit and should be used
to lubricate the threads of all connecting thread-
ed parts, as well as the drive pin at the tip of the
floating shaft .Lubricant should not be used to
lubricate moving parts or bearings.
Grounding Instructions
In the event of a malfunction or breakdown,
grounding provides a path of least resistance
for electric current to reduce the risk of electric
shock. This instrument is equipped with an elec-
tric cord which is grounded to the chassis hous-
ing. The plug must be plugged in to an outlet
that is properly installed and grounded in accor-
dance with all local codes and ordinances.
Unplug motor unit from
the wall.
Insert flat edge of
combination wrench
(included in motor
tool kit) into the
slots of the alumi-
num coupling (see
figure to right).
Using wrench for
leverage, loosen
aluminum cou-
pling by twisting it
counter-clockwise.
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