CRL 64” BELT SANDER
MODEL BM64B FOR 102 x 1625mm SANDING BELTS
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ALL PRODUCTS F.O.B. NEAREST WAREHOUSE
7
4.4 REMOVE AND INSTALL MOTOR
NOTE: This is a straight-forward job that requires a basic knowledge of electrical wiring. If you do not feel confident in
your ability to connect wires, have a qualified electrician change the motor for you.
1.
Unplug/Lock-out the machine, turn off/empty the water supply, and remove the sanding belt.
2.
Before removing the bottom pulley, measure the distance from the back side of the pulley to the side of the tank (Photo 6, Page
8). Record this measurement so you can replace the pulley at this same distance. This will help keep the belt alignment to
original
specs.
3.
Loosen two set screws on the pulley with a long 5/32” Hex/Allen wrench. These can be accessed through the two holes in the pulley.
Remove the pulley.
4.
Disconnect the wiring from the motor by removing four screws and the rectangular cover from the motor electrical junction box.
5.
Remove the plastic tape insulation from the wire connections. The Orange/Black/White group can remain connected.
6.
Disconnect the green/yellow earth wire from the green earth screw in the junction box.
7.
Disconnect 2 groups of wires and keep the screws and nuts used to secure the new connections. Make a wiring diagram to
show how the wires are connected.
8.
With the power wires and earth wire disconnected from the motor, the power cable can be disconnected from the junction box.
9.
The four bolts holding the motor to the machine can now be loosened.
10. The motor itself weighs about 40 lbs (18 kg). Use a small jack, a small stack of wood shims or have a helper hold the motor up
while the bolts are loosened. Slowly pull the motor from the machine.
11. Align the new motor with the bolts. Tighten the bolts from inside the tank.
12. The new motor will need to have ring lugs installed on all wires. If you are not comfortable doing this part of the operation, have
a qualified electrician complete the job.
13. Install solderless ring terminals (lugs) on the motor wires, reconnect the power cord to the junction box, and connect the power
cord wires as they were previously installed with screws and nuts (see step #7 above).
Tape all connections securely with
electrical tape.
14. Reconnect the earth wire and replace the junction box cover. Plug in and Unlock the power and check for motor operation. The
motor should turn counterclockwise as viewed from the shaft end in the tank.
15. After motor operation is confirmed. UNPLUG the power cord, apply a small amount of light grease to the motor shaft to prevent
rust, and replace the lower pulley and the sanding belt. Remember to refer to the “pulley to tank” measurement that was made in
step #2. The water supply can now be refilled.
16. Turn the belt through two complete rotations by hand and check the alignment. Adjust as needed to make the belt track straight
on all three wheels.
4.5 Remove and Replace Sanding Belt, Upper and Lower Pulleys
Sanding Belt
With the belt door on the right side of the machine open, firmly pull down on the black tensioner handle. This will allow the belt to
be removed from the top pulley and then from the lower pulley. Belt installation is just as simple. Hold the belt with one hand,
gripping the middle, and loop the bottom of the belt around the lower pulley. Make sure that the belt is not between the water
spray tube and the tank side. Slide one side of the belt over the platen and pull down on the tensioner handle. This will allow you
to put the top of the belt over the top pulley. Check that the spray tube is not hooked on the belt and pull the belt through two
complete rotations to check the tracking.
Lower Pulley
Before removing the lower pulley, measure and record the distance from the back edge of the pulley (closest to the motor) to
the side of the tank, as shown in
Photo 3 on Page 8.
The Lower Pulley is removed by first removing the sanding belt and then
removing two set screws, accessed through two holes in the pulley, with a 5/32” Hex/Allen wrench (Photo 4, Page 8).
Upper Pulley
The Upper Pulley is mounted on a shaft with two sealed bearings and lock rings. It is recommended that the pulley, shaft, and
bearings be replaced as a unit. Loosen the two square head screws on the pulley shaft support on the tensioner (Photo 2, Page
8). Slide the shaft out toward the pulley. Lightly coat the new shaft with grease and insert the new shaft and pulley into the
support with the end of the shaft protruding about 1/16" past the end of the support. (Photo 2, Page 8) Tighten the square head
screws. On older machines you may need a wood or plastic hammer to tap the shaft out. Do not hit the pulley itself with
anything.
