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CRL/SOMACA BELT SANDER
MODELS 2300RP, 2300, AU2300
a nd
AU23
Page 3
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 the machine
, turn off 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 4, Page 4). 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 two screws on the connection box cover on the motor. Remove the water solenoid (page 2).
5.
On 120 volt motors, pull the Brown wire from motor lug No. 1 (per the drawing on the motor) and the Yellow and Blue wires from motor lug No. 2.
6.
Disconnect the Green ground wire from the ground screw. (See wiring diagrams on page 8)
7.
Those are the three power wires plus a green ground wire coming from the power line in. Mark which motor connection each one goes to for rewiring.
8.
With the power wires disconnected from the motor, the power cable can be disconnected from the motor.
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 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. Capacitor should be facing up. Tighten the bolts from inside the tank. Mount the solenoid and water lines as
indicated on page 2.
12. Reconnect the power cable and connect the four wires to the motor lugs as removed and replace the metal cover. Plug in the power cord and check
for motor operation. The motor should turn counterclockwise as viewed from the shaft end in the tank. Reverse wires #5 and #8 to correct rotation.
13. 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
turned back on.
14. 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.
Remove and Replace Sanding Belt, Upper and Lower Pulleys, and Roller Platen
Always UNPLUG the machine before doing ANY work on it. The sanding belt should be removed before attempting any work on Pulleys or the
Roller Platen.
Sanding Belt
The sanding belts are easy to replace. 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 nozzle and the tank
side. Slide one side of the belt over the platen roller 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 nozzle 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 4 on Page 4. 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 5, Page 4).
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 3, Page 4). 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 3, Page 4) 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.
Roller Platen
The Roller Platen is made as an assembly with the roller, two sealed bearings, and the shaft. It is best to measure and record the distance from the
inside edge of the roller to the bracket (Photo 6, Page 4) so the new Roller Platen can be placed close to the same position.
To replace the Roller Platen, remove the sanding belt, then loosen two square head set screws on the Roller Platen bracket (Photo 6, Page 4), and
remove the assembly. Fit the new assembly at the same distance from the bracket as the old Platen, then tighten the two set screws. Replace the belt,
turn on the machine and check that the platen and belt are running true.
