JET Tools 708599 User Manual - Page 18

Belt Tracking Adjustment The belt should run at the center of the belt arm without veering to the left or right. Check this as follows: 1. Disconnect machine from the power source. 2. Rotate the belt by hand and observe how it tracks. The belt should run centered on the belt wheels. 3. If the belt has a tendency to track left or right of center, loosen locking nuts (A, Figure 28). 4. Turn the front screw (B, Figure 28) while turning the belt by hand and observe belt tracking. Once the belt starts to move in the desired direction, stop and turn the rear screw (C) in the same manner. NOTE: These adjustments are sensitive and should be done in small increments. 5. Grasp the tensioning adjustment handle (D) and start the machine. Be ready to pull down on the tension adjustment handle should the belt want to run off the belt wheel. 6. Fine adjustment of the tracking may be necessary. When the tracking has stabilized, slowly release the belt tensioning arm and let the machine run for two minutes. 7. Tighten lock nuts (A) when tracking adjustments are satisfactory. Belt Replacement 1. Disconnect machine from the power source. 2. Remove the lock knob and open the left side panel. 3. Release belt tension using the handle (D, Figure 28), and slide belt off the wheels. 4. Refer to "Installing Abrasives" section for instructions on installing the new belt. Abrasive Disc Replacement 1. Disconnect machine from the power source. 2. Slowly work the tip of a knife under the abrasive disc, and work it around the circumference of the disc until abrasive can be removed by hand. 3. Clean the aluminum disc of any residual adhesive, using mineral spirits or similar solvent. Allow to dry. 4. See "Installing Abrasives" for instructions on installing the new abrasive disc. Figure 28 Maintenance Before doing maintenance on the machine, disconnect it from the electrical supply by pulling out the plug or switching off the main switch! Failure to comply may cause serious injury. Wipe the machine down after each use. Keep exposed metal surfaces clean and rustfree. A light coat of paste wax applied to the tables will help protect the surfaces. Make periodic inspections of the sander, checking fastener tightness, abrasive wear, tracking accuracy, etc. Listen for any unusual motor noises or vibrations that might indicate bearing fatigue. (Note: All rotating parts run on sealed ball bearings and do not require lubrication.) If you will not be using the machine for an extended period, remove the abrasive belt; this will prevent it from stretching and will prolong its life. If the power cord is worn, cut, or damaged in any way, have it replaced immediately. 18