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3G Storm Series
®
Wheelchairs 18 Part No. 1104849
SECTION 2 TROUBLESHOOTING
TROUBLESHOOTING
4 Pin Motor Connector
Motor
FIGURE 3 - MOTOR BRUSH
INSPECTION
Cap
MOTOR TESTING (FIGURE 2)
NOTE: This procedure should only be
performed on wheelchairs with the
conventional motor/gearbox assembly. For
gearless/brushless motors, there are no
serviceable parts. Return motor to
manufacturer for testing.
1. On the 4-pin motor connector, locate
the two (2) contacts in the red and
black housings.
2. Set the digital multimeter to measure
ohms (Ω).
3. Measure the resistance between the
two (2) motor contacts.
NOTE: A normal reading is between 1 and 5
ohms (Ω). A reading of 0 ohms (Ω) or in
excess of 15 ohms (Ω) indicates a problem.
High readings are generally caused by bad
connections and/or damaged brushes. Contact
authorized dealer or Invacare.
MOTOR BRUSH INSPECTION (FIGURE 3)
NOTE: This procedure should only be performed on wheelchairs with conventional motor/
gearbox assembly.
There are two (2) contact brushes on
STORM motors located under the brush
caps on the motor housing. If these caps
are hard to remove they are either
overtightened or the motor has become
very hot. Let motors cool. If caps still
cannot be removed, it is recommended
that the motor be sent to Invacare
Technical Services for inspection/repair.
NOTE: It is very important to note which way
the brush comes out of the motor. The brush
MUST be placed into the motor exactly the
same way to ensure good contact with the
commutator.
FIGURE 2 - MOTOR TESTING
Motor Connector
Ohmmeter
Motor Connector
Ohmmeter