Troubleshooting - Mechanical Problems - Jet 22-44OSC Operating Instructions And Parts Manual

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