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1. Once the motor brush caps have been removed, pull
the brushes out of the motor. The end of the brushes
should be smooth and shiny and the spring should not
be damaged or discolored. If one or both of the brushes
are damaged, only the damaged or worn brushes need
be replaced. It is very important that any time a brush
is replaced, it must be “burned in”. This is accomplished
by running the motor for one hour in each direction
with a half hour break in-between. This should also be
done with little or no load on the motor, i.e., put the rear
of the wheelchair up on blocks and run the wheelchair.
A motor with only one brush replaced will only carry a
small percentage of its rated load capacity until the
NEW brush is burned in.
ELECTROMECHANICAL PARKING
BRAKE TESTING (FIGURE 5)
WARNING
Invacare recommends that the following proce-
dures be performed by an Invacare Dealer or
Qualified Service Technician.
1. On the four-pin motor connector, locate the side by
side connectors in the black housings.
2. Set the digital multimeter to read ohms.
3. Measure the resistance between the two (2) brake
contacts. A normal reading is 100 ohms (W). A read-
ing of 0 ohms (W) or a very high reading; i.e., MEG
ohms or O.L. (out of limit) indicates a shorted brake
or an open connection respectively. If either condition
exists, it is recommended that the motor be sent to
Invacare Technical Service for inspection/repair.
CAUTION
A short circuited brake will damage the brake
output section in the controller. DO NOT connect
a bad electromechanical brake to a good con-
troller module. A shorted electromechanical
brake MUST be replaced.
NOTE: A bad motor can damage the controller module
but a bad controller will NOT damage a motor.
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TROUBLESHOOTING
FIGURE 5 - PARKING BRAKE TESTING
End Cap
NOTE: Back view of brake.
Motor not shown for clarity.
Spring (Lift out of
the way with small
screwdriver)
Motor Brush (Lift out with small screwdriver)
Long Motor
End Cap
Phillips
Screws
Long End Cap Motor
FIGURE 4 - MOTOR BRUSH INSPECTION
Ohmmeter
4 Pin Motor
Connector
Motor Connector