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-57-
W1772/W1773 37" Drum Sander
SERVICE
Machine Operations
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Machine slows when sand-
ing, making squealing noise,
especially on start-up.
1. V-belts loose.
2. V-belts worn out.
1. Tighten V-belts (Page 33).
2. Replace V-belts (Page 33).
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 33).
Vibration when sanding.
1. Loose drum pillow bearings.
2. Worn drum pillow bearings.
1. Tighten drum pillow bearings.
2. Replace drum pillow bearings.
Grinding, screeching, or
rubbing noise when sand
-
ing drums are powered up.
1. Drum bearings lack sufficient
grease.
2. Drum bearings worn.
1. Grease the pillow bearings (Page 30).
2. Replace the drum bearings.
Short V-belt lifespan.
1. Pulleys not aligned correctly.
2. Improperly tensioned.
1. Align pulleys (Page 33).
2. Properly tension V-belts (Page 33).
Machine lacks power;
drums stop turning under
load.
1. V-belts loose.
2. Too much pressure on pressure roll-
ers.
1. Tighten V-belts (Page 33).
2. Reduce pressure roller pressure (Page 42).
Conveyor slips under load.
1. Conveyor is too loose.
2. Too much load.
1. Tension conveyor (Page 36).
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 37).
Workpiece pulls to one side
during sanding operations.
1. One of the sanding drums is not par-
allel with the table.
1. Adjust the sanding drums parallel to the table (Page
38).
Excessive snipe.
1. Too much pressure roller pressure.
2. Too much pressure from rear pres-
sure rollers.
3. Lack of outfeed support.
1. Reduce pressure roller pressure (Page 42).
2. Reduce rear pressure roller pressure (Page 42).
3. Set up outfeed table or have someone catch the
workpiece as it comes out.
Workpiece kicks out.
1. Not sufficient pressure roller pres-
sure.
1. Increase pressure roller pressure (Page 42).
Sanding drums make scrap
-
ing noises..
1. Drums scrape dust scoop 1. Adjust dust scoops so they do not touch sanding
drums (
Page 43).
Sandpaper tears off drums
during operation.
1. Nail/staple in workpiece.
2. Sandpaper not fastened correctly.
3. Drums not perpendicular to the feed
direction.
1. Sand only clean workpieces.
2. Install the sandpaper correctly (Page 28).
3. Adjust the drums perpendicular to the feed direc-
tion (
Page 38).
Table elevation controls are
stiff and hard to adjust.
1. Table lock is engaged.
2. Table lift screws dirty or loaded with
sawdust.
3. Chain idler roller sprocket lock nuts
have been tightened against roller.
4. Elevation handle worm gear is dirty
or loaded with sawdust.
1. Disengage table lock.
2. Clean and regrease table lift screws (Page 43).
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. Dust collection lines incorrectly sized
for this machine.
2. Dust collector underpowered or too
far away from this machine.
1. Use at least an 8" main line with two 6" branch lines
that each Y into 4" at the machine.
2. Upgrade your dust collector or decrease the dis-
tance from the dust collector to the machine.