B/T
®
RAPID-LOAD
®
Peristaltic Pumps and Drive Operating Manual 4-1
Cole-Parmer
Section 4
Maintenance and Troubleshooting
Tools Required: Phillips screwdriver
WARNING: Power must be removed from motor before
performing this procedure.
1. Cut off power to the pump by disconnecting line cord or, if wired
permanently, by removing the fuse. Do not assume that turning off the
switch at the motor (or controller) is "safe enough."
2. To access the motor brushes, remove six screws securing the access
plate and remove plate (see Figure 4-1).
3. Loosen screw terminal at top of brush housing and disconnect brush wire.
4. Press down on brush retainer to disengage tabs then rotate brush
retainer slightly toward front of motor and remove brush retainer.
5. Slide brush assembly out of housing.
6. Install new brush assembly with brush wire toward rear of motor and
spring assembly on top.
7. Insert brush retainer against brush springs and push down, then rotate
retainer slightly toward rear of motor to engage tabs of retainer under
rear edge of brush housing.
8. Attach brush wire to screw terminal at top of brush housing. Be sure
wire is clear of access opening.
9. Attach cover plate with six screws.
NOTE:
Always replace both brushes at the same time.
REPLACING
MOTOR BRUSHES
MODELS 77111-12
77111-17
77111-40
77111-47
77111-60
77111-67
Figure 4-1.
Motor Brush
SCREW TERMINAL
BRUSH HOUSING
SPRING
TAB
ACCESS PLATE
SCREWS
BRUSH
RETAINER
BRUSH ASSEMBLY
