SECTION 9—MOTORS
Replacing Internal Motor Brushes
NOTE: For this procedure, refer to FIGURE 9.3 on page 83.
1.Turn power off.
2.Disengage motors.
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”.
CAUTION
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” .
CAUTION
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:
i.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.
ii.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
11.If new motor brush was installed, perform the following process:
NOTE: This process, also called Brush
Pronto® M71™ | 82 | Part No 1118377 |