Changing Motor Brushes - Grizzly GO739 Owner's Manual

Changing Motor
brushes
this sander has a permanent magnet motor that
uses carbon brushes for operation. these brush-
es normally wear out over time and eventually
need to be replaced.
symptoms that the brushes have worn beyond
their usable life may include a loss of power,
inconsistent operation of the motor (motor cuts in
and out inexplicably), or an inability of the motor
to start.
if you are having trouble with the performance
of the motor, first refer to Troubleshooting on
Page 22 to determine if the motor brushes must
be replaced.
A pair of new brushes can be purchased from
grizzly by requesting part #p0739033A. the
replacement procedure can usually be done in
about 15 minutes. When replacing the brushes,
we recommend replacing them one at a time so
you can keep track of which wire connects to each
brush.
Please note: the brushes have a plug-type
prongs (see figure 19) that insert into the motor
(similar to regular power plug). take care when
removing them to pull them out first instead of just
up.
figure 19. Motor brush assembly.
Model g0739 (Mfg. since 2/12)
Tools Required:
screwdriver phillips #2 ................................1
To change motor brushes:
1.
2.
3.
4.
5.
6.
7.
8.
plug prong
disConnECt sAndEr FroM poWEr.
turn machine on its side, and remove the
screws securing the base plate, then remove
the base plate to allow access to the motor.
loosen the screws that secure the clamp
plate over the brush assemblies (see figure
20) but do not completely remove the plate.
disconnect the wires attached to the motor
brushes. gently pull the brush assembly
straight toward you and then upward to
remove it.
Motor Brushes
figure 20. Motor brush location on motor.
replace the motor brush assembly.
reconnect the wire to the motor brush.
tighten the clamp plate back in place, then
repeat these steps to change the second
motor brush assembly.
replace and tighten the base plate.
Qty
Clamp plates
-21-