Grizzly GO739 owner manual Changing Motor Brushes, Tools Required Qty, To change motor brushes

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.

Plug Prong

Figure 19. Motor brush assembly.

Model G0739 (Mfg. Since 2/12)

Tools Required:	Qty
Screwdriver Phillips #2	.................................1

To change motor brushes:

1.DISCONNECT SANDER FROM POWER.

2.Turn machine on its side, and remove the screws securing the base plate, then remove the base plate to allow access to the motor.

3.Loosen the screws that secure the clamp plate over the brush assemblies (see Figure 20) but do not completely remove the plate.

4.Disconnect the wires attached to the motor brushes. Gently pull the brush assembly straight toward you and then upward to remove it.

Motor Brushes

Clamp Plates

Figure 20. Motor brush location on motor.

5.Replace the motor brush assembly.

6.Reconnect the wire to the motor brush.

7.Tighten the clamp plate back in place, then repeat these steps to change the second motor brush assembly.

8.Replace and tighten the base plate.

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