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Troubleshooting Guide (continued)
Motor
Wiring Diagram
Trouble Shooting of Brake by
Qualified Service Person Only
1. Check commutation at no load. If there
is a heavy sparking which follows the
curvature of the commutator: replace
the armature.
2.To continue trouble shooting, now
unplug the power cord.
3.Install service brushes, especially if
delayed come-in of brake has been
noticed before failure.
4.Check brake circuit for continuity:
remove brush caps and brushes. Use
ohmmeter to check continuity from
brass brush holder to brush holder. If
open, locate exact place using ohmme-
ter. As indicated by test, tighten con-
nection or replace field assembly or
replace switch.
5. After repair, check direction of blade
rotation vs. guard arrow.
Problem Probable Cause Suggested Corrective Action
Brake does not stop
blade within 6 sec-
onds.
1. Brushes not seated
or lightly sticking.
2. Motor brake winding
overheated from
use of prohibited
accessory or rapid
on/off cycling.
3. Arbor screw loose.
4. Other
1. Inspect/clean/replace
brushes. See “Maintenance”
section.
2. Use only recommended
blades/accessories.
Let motor cool down.
3. Retighten
4. Get authorized service. See
“Troubleshooting of brake”
section.
Motor does not
start.
1. Fuse.
2. Brushes worn.
3. Other.
1. Check fuse, or circuit breaker.
2. See “Maintenance” section.
3. Get authorized service.
Brush sparking
when switch
released.
1. Normal automatic
brake working prop-
erly.
1. None
White
Black
Gray Brake
N.C.
Brush
Brush
Armature
Red
Red Brush
Lead
N.O. Switch
Cord w/Plug
Connector
White Field
Lead
White Brush
Lead
Lead