Assessments - 2, GPA: 4
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4. Motor overloaded. 1. Repair or replace connections on motor for loose or shorted terminals or worn insulation. 2. Correct the low voltage conditions. 3. Install correct fuses or circuit breakers. 4. Reduce load on motor. Drums run backwards (G0450 only). 1. Two of the power wires are reversed (G0450 only). 1. Switch two of the current carrying wires at the main power block (G0450 only). Machine slows when sanding, making a squealing noise, especially on start-up. 1. V-belts loose. 2. V-belts worn out. 1. Tighten V-belts (Page 30). 2. Replace V-belts (Page 31). Loud repetitious noise coming from machine. 1. Pulley setscrews or keys are missing or loose. 2. Motor fan is hitting the cover. 3. V-belts are defective. 1. Inspect keys and setscrews. Replace or tighten if necessary. 2. Adjust fan cover mounting position, tighten fan, or shim fan cover. 3. Replace V-belts (Page 31). Vibration when sanding. 1. Loose drum pillow bearings. 2. Worn drum pillow bearings. 1. Tighten drum pillow bearings. 2. Replace drum pillow bearings. Troubleshooting -28 G0449/G0450 37" Drum Sander Symptom Possible Cause Possible Solution Grinding, screeching, or rubbing noise when sanding drums are powered up. 1. Drum bearings lack sufficient grease. 2. Drum bearings are worn and need replacement. 1. Grease the pillow bearings (Page 26). 2. Replace the drum bearings. Short V-belt lifespan. 1. Pulleys not aligned correctly. 2. Improperly tensioned. 1. Align pulleys (Page 31). 2. Properly tension V-belts (Page 30). Machine lacks power; drums stop turning under load. 1. V-belts loose. 2. Too much pressure on pressure rollers. 1. Tighten V-belts (Page 30). 2. Reduce pressure roller pressure (Page 36). Conveyor slips under load. 1. Conveyor is too loose. 2. Too much load. 1. Tension conveyor (Page 32). 2. Decrease load. Conveyor tracks to one side; conveyor hits the roller cover. 1. Conveyor tracking is incorrect. 1. Track the conveyor so it runs straight (Page 32). Workpiece pulls to one side during sanding operations. 1. One of the sanding drums is not parallel with the table. 1. Adjust the sanding drums parallel to the table (Page 33). Excessive snipe. 1. Too much pressure from all the pressure rollers. 2. Too much pressure from the rear pressure rollers. 3. Lack of outfeed support. 1. Reduce pressure roller pressure (Page 36). 2. Reduce rear pressure roller pressure (Page 36). 3. Set up outfeed table or have someone catch the workpiece as it comes out. Workpiece kicks out of sander. 1. Not enough pressure from the pressure rollers. 1. Increase pressure roller pressure (Page 36). Sandpaper tears off drums during operation. 1. Nail/staple in workpiece. 2. Sandpaper not tightened or fastened correctly. 3. Drums not perpendicular to the feed direction. 1. Sand only clean workpieces. 2. Install the sandpaper correctly (Page 24). 3. Adjust the drums perpendicular to the feed direction (Page 33). Table elevation controls are stiff and hard to adjust. 1. Table lock is engaged. 2. Table lift screws are dirty or loaded with sawdust. 3. Chain idler roller sprocket lock nuts have been tightened against the roller. 4. Elevation handle worm gear is dirty or loaded with sawdust. 1. Disengage table lock. 2. Clean and regrease table lift screws (Page 27). 3. Adjust the lock nuts on the idler roller sprocket so the roller can spin freely. 4. Remove the worm gear box, clean it, and regrease it. Poor dust collection. 1. The dust scoops are incorrectly positioned. 2. Dust collection lines incorrectly sized for this machine. 3. Dust collector underpowered or too far away from this machine. 1. Experiment with the dust scoops moved further in or out for better results. See Page 37 for instructions on moving a dust scoop. 2. Use at least an 8" main line with two 6" branch lines that each Y into 4" at the machine. 3. Upgrade your dust collector or decrease the distance from the dust collector to the machine. -29 G0449/G0450 37" Drum Sander Gauge Blocks Tools Needed: Qty 6' Long 2x4........................................................1 Miter Saw (or Circular Saw) .............................. 1 Jointer................................................................ 1 Table Saw ......................................................... 1 The gauge blocks described here will be required to complete most of the service procedures in this section. After you have made them, they can be conveniently stored inside of the sander cabinet for future use. To make the gauge blocks: 1. Edge joint the concave edge of the 2x4 flat on a jointer, as shown in Figure 27. Figure 27. Edge jointing on a jointer. 2.Place the jointed edge of the 2x4 against the table saw fence and rip cut just enough off the opposite side to square up the two edges of the 2x4, as shown in Figure 28. ............ Previously Jointed Edge Held Against Fence Opposite Edge Rip Cut with Table Saw Figure 28. Rip cutting on a table saw. 3. Cut the 2x4 into two even pieces to make two 36" long wood gauge b...