Replacing Motor Brushes - Invacare Pronto M50 Service Manual

SECTION 12—MOTORS

Replacing Motor Brushes

NOTE: For this procedure, refer to FIGURE 12.4 on page 118.
1. Turn power Off.
2. Disengage motors. Refer to Engaging/Disengaging Motor Release Lever on page 114.
3. Remove the two end cap screws on the end cap. Refer to Detail "A.
4. Remove the end cap and locate the brush assembly on each side of the motor. Refer to
Detail "B".
Use caution when removing the screw and washer that attaches the shunt wire to
the motor. DO NOT discard the screw and washer. The screw and washer are not
available as service parts.
5. Remove the mounting screw and washer that mounts the shunt wire to the motor
assembly. DO NOT discard the mounting screw and washer. Refer to Detail "C" .
When removing the existing brushes, ensure that the spring retainer is not
removed and/or discarded. The spring retainer is not available as a service part.
6. Release the tension on the brush spring retainer with a small screwdriver and position
the screwdriver in place to hold the spring retainer. Refer to Detail "D".
7. 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
any discoloration in the shunt wire and perform one of the following:
• If motor brush is in good condition, (i.e., the end of the brushes are smooth and
shiny and shunt wire is not discolored), reinstall existing brush back into brush
holder.
• If motor brush is in bad condition, brush is worn or damaged, discard
IMMEDIATELY and install new brush into brush holder.
8. Remove the screwdriver to release spring retainer so as to hold brush in place.
9. Attach the shunt wire to the motor housing using the mounting screw and washer
(removed in STEP 5). Securely tighten.
10. Replace the motor end cap and secure using the two end cap screws.
NOTE: Repeat STEPS 1-10 for the opposite motor.
Pronto® Series
CAUTION
CAUTION
116
Part No. 1125075