25
Troubleshooting – Mechanical Problems
Trouble Probable Cause Remedy
Conveyor belt does not
move, or runs
`intermittently.
Shaft coupling (#20, page 30) is loose or
unattached.
Align the shaft flats of the gear motor and
the drive roller and tighten the shaft-
coupling setscrews.
Conveyor belt slips on
drive roller.
Improper conveyor belt tension. Adjust belt tension.
Excessive depth of cut or feed rate. Reduce depth of cut; reduce feed rate.
Board slips on conveyor
belt.
Tension rollers too high. Lower tension rollers (see page 17).
Excessive feed rate. Reduce feed rate.
Dirty or worn conveyor belt. Replace conveyor belt.
Abrasive improperly wrapped. See Installing Abrasives.
Conveyor belt tracks to
one side, or oscillates
from side to side.
Conveyor belt out of adjustment. Readjust conveyor belt; see page 16.
Drive or driven roller needs adjusting. Readjust; see page 16.
Conveyor belt worn or defective.
Replace conveyor belt; see Conveyor Belt
Replacement.
Drive roller worn, bent, or varies in
diameter side to side.
Replace drive roller.
Roller bushings elongated due to excessive
wear.
Replace bushings.
Abrasive strip is loose.
Strip caught on inside edge of slot, or on
inboard side of drum.
Re-adjust the strip end in the slot and/or
trim the abrasive edge.
Strip not cut properly.
Re-cut and re-install abrasive strip. See
Installing Abrasives.
Abrasive loads up
prematurely.
Excessive depth of cut. Reduce depth of cut.
Excessive feed rate. Reduce feed rate.
Inadequate dust collection. Increase airflow at dust port.
Inadequate abrasive. Use an open-coat abrasive.
Stock fed at 90° angle to drum.
Angle stock 60° if possible to avoid resin
line buildup.
Table height adjustment
works improperly.
Improper adjustment of height control.
Readjust height control. See Drum Height
Control.
Drum drive v-belt slips. Improper v-belt tension. Increase tension.
Knocking sound while
running.
Bearing(s) out of alignment. Re-align bearings.
V-belt worn. Replace v-belt.
Dust in drum. Remove material inside drum.
Pulley wobbling or out of round. Replace pulley.
Set-screws loose in pulley or bearing. Re-tighten set-screws.
Abrasive fastener on drum loose (without
abrasive strip in place).
Insert abrasive strip, or replace fastener.
Drum bearing(s) worn. Replace drum bearing(s).
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