Copyright 12/14 58 S/N XXXX WO#XXXXXX
Smoracy, LLC
MODEL 3680 SCREEN SECTION
SCREEN MAINTENANCE
OPERATION
Various Screens are available for sizing the product. If it is known that the material being processed is free of
metal or other destructive materials the machine can be operated with the Concave Door in the closed position. IF
THERE IS ANY DOUBT, THE CONCAVE DOOR SHOULD BE SET IN THE OPEN POSITION. The metal can be
removed upon discharge from the Discharge Belt Conveyor. The material can then be reprocessed with the
Concave Door closed. Screens are a very high wear item on your machine and should be checked frequently.
When maintaining the Screens, ALWAYS adjust the Screen at least 1/8” (3.2 mm) from the longest tooth on the
Cutterhead. (This will tend to be a brand new tooth or a fan tooth). Also check to see if the Screen holder bolts are
at 376 ft.-lbs.(510 Nm). IF SCREENS ARE BENT OR BROKEN, REPLACE IMMEDIATELY. FAILURE TO DO SO
WILL CAUSE COSTLY DAMAGE TO YOUR MACHINE.
SCREEN REPLACEMENT
Replacing the Screen is a two man operation, an operator working on the inside and an assistant on the outside.
The Discharge Belt Conveyor must be folded down to its normal operating position and the Concave Door in the
closed position. Do not attempt any type of maintenance without first disengaging clutch, turning off engine,
waiting for the Cutterhead to come to a complete stop, turning Battery Disconnect Switch off, and you must have
the ignition key in YOUR possession.
At the maintenance door on the right side of machine, pull the Engine Disable electrical plug, release the door
latches and swing door open. Retrieve the electric winch control cable from the tool box and plug into receptacle
under engine. Battery Disconnect switch must be turned ON for winch to work. Lower winch and connect it to the
lug on the back of Screen and bring up snug. Remove the eight mounting bolts that hold the screen in place.
Remove Screen out through the maintenance door opening with the assistants help. Install new Screen using
winch to move it into place. Lightly snug up the bolts to hold Screen in place. Move Screen up from Concave Door
about 1/8” (3.2 mm) so Concave Door will open and close. With a new Cuttertooth on each end of the Cutterhead,
set Screen to be no closer than 1/8” (3.2 mm) from Cutterteeth. When final adjustment is completed torque bolt to
376 ft.-lbs (510 Nm). Roll Cutterhead several times by hand to make sure there is no contact between Cutterteeth
and Screen. Reinstall winch stop block before reeling in winch cable. Stop block must pull tightly to engine base
when complete. Turn Battery Disconnect switch off, disconnect winch control cable and stow in tool box. Close
and secure maintenance door and finally reinsert safety plug or the engine will not start.
CONCAVE DOOR REPLACEMENT
Replacing the Concave Door, also known as the Lower Gate or Lower Screen is a two man operation. The
Discharge Belt Conveyor must be folded down to its normal operating position and the Concave Door in the closed
position. Do not attempt any type of maintenance without first disengaging clutch, turning off engine, waiting for
the Cutterhead to come to a complete stop, turning Battery Disconnect Switch off, and you must have the ignition
key in YOUR possession.
Remove the indicators on each side of the machine that show the Concave Door position. At the maintenance
door on the curb side of machine, pull the Engine Disable electrical plug, release the door latches and swing door
open. Remove the pin(s) connecting the hydraulic cylinder(s ) to the Concave Door. Starting on the curbside,
remove the four bolts holding the hinge pin access door, then pull the hinge pin out. Go to roadside and repeat .
Once the hinge pins are out, the Concave Door can be pulled free and slid out through the maintenance door
opening. Slide the new Concave Door into place. Start the hinge pin from the curbside and drive it through until it
stops. Be sure to align keystock with gate bushing slot. Go to roadside and repeat. Install access doors and
tighten bolts. Reconnect hydraulic cylinder(s) to the Concave Door. Check the clearance between the Concave
Door and new Cuttertooth. It should be no closer than 1/8” (3.2 mm). If adjustment is necessary, pull the cylinder
pin and turn the hydraulic cylinder clevis in or out to achieve proper clearance. Reinstall the indicators on each side
of machine. Close the maintenance door and insert safety plug. Start engine and operate manual valve to open and
close the Concave Door checking for proper operation.
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