Changing Motor Brushes - Grizzly T27417 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 #PT27417136A. 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 32) 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 32. Motor brush assembly.
-28-
Tools Required:
Screwdriver Phillips #2 ................................1
To change motor brushes:
1.
2.
3.
4.
Figure 33. Location of motor brushes and clamp
5.
6.
7.
Plug Prong
DISCONNECT MACHINE FROM POWER!
Turn machine on its side, and remove screws
that secure base plate, then remove base
plate to allow access to motor.
Loosen screws that secure clamp plate over
one brush assembly (see Figure 33) but do
not completely remove plate.
Disconnect wires attached to brush assem-
bly. Gently pull brush assembly straight
toward you and then upward to remove it.
Motor Brushes
plates.
Replace motor brush assembly, reconnect
wire, and tighten clamp plate back in place.
Repeat these Steps 3–5 with the other brush
assembly.
Re-install and tighten base plate.
Model T27417 (Mfd. Since 09/15)
Qty
Clamp Plates