Brushes

Brushes







INSPECT BRUSH LENGTH
Using vernier calipers, measure the brush length.

Standard length:
1.4 kW type: 15.5 mm (0.610 in.)
1.8 kW type: 15.0 mm (0.591 in.)

Minimum length:
1.4 kW type: 10.0 mm (0.394 in.)
1.8 kW type: 9.0 mm (0.354 in.)

If the length is less than minimum, replace the brush holder and field frame.

Brush Springs

Brush Springs (3RZ-FE):

INSPECT BRUSH SPRING LOAD
Take the pull scale reading the instant the brush spring separates from the brush.

Standard installed load:
1.4 kW type
17.6 - 23.5 N (1.80 - 2.40 kgf, 4.0 - 5.3 lbf)
1.8 kW type
21.5 - 27.5 N (2.20 - 2.80 kgf, 4.9 - 6.2 lbf)

Minimum installed load:
1.4 kW type: 11.8 N (1.20 kgf, 2.6 lbf)
1.8 kW type: 12.7 N (1.30 kgf, 2.7 lbf)

If the installed load is less than minimum, replace the brush springs.

HINT: Take the pull scale reading the instant the brush spring separates from the brush.

Bush Holder

Brush Holder (3RZ-FE):

INSPECT INSULATION OF BRUSH HOLDER
Using an ohmmeter, check that there is no continuity between the positive (+) and negative (-) brush holders.
If there is continuity, repair or replace the brush holder.