Inspecting/Replacing Motor Brushes - Invacare Pronto M91 Service Manual

Inspecting/Replacing Motor Brushes

NOTE: For this procedure, refer to FIGURE 10.3.
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.
1. Turn power off.
2. Remove the motor. Refer to Removing/Installing the Motor on page 78.
NOTE: There are four (4) motor brushes on M91/M94 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.
3. Remove the brush cap securing the motor brush into the motor housing.
4. Remove the motor brush and perform the following:
A. Inspect the commutator (not shown) for damage.
B. Inspect the motor brush thoroughly for excessive wear or chips in the brush and
perform one (1) of the following:
• If motor brush is in good condition, (i.e., the end of the brushes are smooth and
shiny), reinstall existing brush.
• If motor brush is in bad condition, brush is worn or damaged, discard
immediately and install new brush.
5. Reinstall motor brush and brush cap into the motor housing.
6. Repeat STEPS 3-5 until all four (4) motor brushes have been inspected/replaced.
7. Reinstall the motor. Refer to Removing/Installing the Motor on page 78.
NOTE: Repeat STEPS 2-7 for the opposite motor.
Part No. 1125038
79
SECTION 10—MOTORS
®
Pronto M91 and M94
™