26
Troubleshooting – Operational Problems
Trouble Probable Cause Remedy
Ripples in sanded
surface.
(Non-uniformly spaced
ripples).
Uneven feed rate. Check for these conditions and refer to
previous Troubleshooting sections:
- Conveyor belt slips on drive roller.
- Board slips on conveyor belt.
- Conveyor gear motor stalls.
- Excessive v-belt tension.
- Set-screw loose on shaft coupler
between gear motor and conveyor.
- Conveyor bushings worn – replace.
- Conveyor bushings dry – lubricate.
Ripples in sanded
surface.
(Uniformly spaced
ripples).
Excessive feed rate. Reduce depth of cut and/or feed rate.
Excessive depth of cut. Reduce depth of cut and/or feed rate.
Sander vibration.
Check for these conditions:
- Loose bolts, or loose bearing and pulley
set-screws – re-tighten.
- Dirty drum – clean inside.
- Excessive v-belt tension – reduce
tension.
- Worn v-belt – replace.
- Warped drive pulley – replace.
- Drum out of balance – contact your dealer or
JET authorized service center.
Sniping of wood
(gouging near end of
board).
Tension rollers set too low.
Re-set tension rollers; see Tension Roller
Adjustment.
Stock not supported properly during
infeed or outfeed.
Support stock with roller stand, tables or
benches.
Conveyor drive roller or driven roller
higher than conveyor belt surface.
Re-adjust roller(s).
Burning of wood.
Feed rate too slow. Increase feed rate.
Excessive depth of cut for grit used.
Reduce depth of cut or increase grit
coarseness.
Excess build-up on abrasive strips.
Reduce depth of cut; clean strips or replace;
angle stock when feeding.
Abrasive is too fine. Replace with abrasive of coarser grit.
Abrasive strips are overlapped. Rewrap strip without overlap. See pages 11-12.
Drum out of alignment. Re-align drum. See pages 16-17.
Gouging of wood.
Conveyor belt is loose. Adjust conveyor belt tension. See page 15.
Excessive depth of cut. Reduce depth of cut.
Wood slipping on conveyor due to
lack of contact.
Use alternate feeding procedure.
Abrasive is too fine. Replace with coarser grit.
Line or groove in stock. Inconsistent feed rate.
Do not stop or change the feed rate while
feeding stock.
Lines or groove in stock
while in oscillation mode
Feed rate not set to maximum. Set feed rate to maximum.
Unsanded ridge along
length of piece
(sandpaper appears
clean).
Grit has been removed from
backing.
Avoid this area of drum, or replace abrasive
strip.
Replacement Parts
Replacement parts are listed on the following pages. To order parts or reach our service department, call
1-800-274-6848, Monday through Friday (see our website for business hours, www.jettools.com). Having
the Model Number and Serial Number of your machine available when you call will allow us to serve you
quickly and accurately.
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