Grizzly G0920 Owner's Manual page 38

Motor & Electrical (Cont.)
Symptom Possible Cause
Machine has 1. Motor, motor mount, or component loose.
vibration or
noisy operation.
2. Stand feet not adjusted properly.
3. Loose/worn drum bearings.
4. Motor fan rubbing on fan cover.
5. Centrifugal switch/contact points at fault.
6. Motor bearings at fault.
Operation
Symptom Possible Cause
Sandpaper 1. Sanding depth too deep/feed rate too slow.
clogs quickly.
2. Workpiece has high moisture content or sap.
3. Incorrect sandpaper grit.
4. Poor dust collection.
5. Sandpaper loaded with sawdust and gum.
6. Worn sandpaper.
Sandpaper 1. Sandpaper not properly wrapped onto drum.
comes off of
2. Sandpaper not cut to correct dimensions.
drum or is
3. Torn or damaged sandpaper.
loose.
4. Foreign object in workpiece.
5. Sanding drum not parallel to table.
Sandpaper 1. Sanding drum not parallel with table.
tears off drum.
2. Sandpaper overlapping.
3. Sanding depth is too deep.
Burn marks on 1. Using too fine of sanding grit for sanding
workpiece.
depth.
2. Sandpaper loaded with sawdust and gum.
3. Feed rate too slow.
4. Sandpaper not properly wrapped onto drum.
5. Worn sandpaper.
Glazed 1. Sanding wet stock.
workpiece
2. Sandpaper loaded with sawdust and gum.
surface after
3. Sanding stock with high amount of applied
sanding.
finishes.
Workpiece slips 1. Sanding depth too deep/feed rate too fast.
on conveyor or
2. Conveyor belt dirty or worn.
kicks out.
3. Pressure rollers not properly adjusted.
Conveyor 1. Conveyor belt tension not properly adjusted.
belt slips or
2. Conveyor belt tracking not properly adjusted.
does not track
3. Conveyor belt worn.
correctly.
4. Workpiece too heavy.
-36-
Possible Solution
1. Replace damaged or missing bolts/nuts or tighten if
loose.
2. Adjust stand feet to stabilize machine.
3. Tighten/replace drum bearings.
4. Fix/replace motor fan cover or loose/damaged fan.
5. Adjust centrifugal switch/clean contact points. Replace
either if at fault.
6. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
Possible Solution
1. Reduce sanding depth (Page 25)/increase feed rate
(Page 27).
2. Use different stock, or accept characteristics and plan
on cleaning (Page 33)/replacing (Page 29) sandpaper
frequently; remove applied finishes before sanding.
3. Use correct sandpaper grit for operation (Page 29).
4. Unclog ducts; close gates to improve suction; re-
design dust collection system.
5. Clean (Page 33)/replace (Page 29) sandpaper.
6. Replace sandpaper (Page 29).
1. Re-install sandpaper (Page 29).
2. Use sandpaper cut to correct dimensions (Page 30).
3. Replace sandpaper (Page 29).
4. Sand only clean workpieces.
5. Align sanding drum to table (Page 41).
1. Adjust sanding drum parallel to table (Page 41).
2. Re-install sandpaper (Page 29).
3. Reduce sanding depth (Page 25).
1. Use coarser grit sandpaper (Page 29) or decrease
sanding depth (Page 25).
2. Clean (Page 33)/replace (Page 29) sandpaper.
3. Increase feed rate (Page 27).
4. Re-install sandpaper (Page 29).
5. Replace sandpaper (Page 29).
1. Only sand stock that has moisture content below 20%.
2. Clean (Page 33)/replace (Page 29) sandpaper.
3. Use different stock, or accept characteristics and plan
on cleaning (Page 33)/replacing (Page 29) sandpaper
frequently; remove applied finishes before sanding.
1. Reduce sanding depth (Page 25)/feed rate (Page 27).
2. Clean/replace conveyor belt (Page 39).
3. Properly adjust pressure roller height (Page 44).
1. Properly adjust conveyor belt tension (Page 38).
2. Properly adjust conveyor belt tracking (Page 38).
3. Replace conveyor belt (Page 39).
4. Use lighter workpiece.
Model G0920 (Mfd. Since 10/20)