Jet 22-44 Pro-3, Operating Instructions And Parts Manual, Page: 31 / 40

31
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 page 21.
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
12 and 13.
Drum out of alignment. Re-align drum. See page 18.
Gouging of wood.
Conveyor belt is loose. Adjust conveyor belt tension. See page 19.
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.
Unsanded ridge
along length of piece
(sandpaper appears
clean).
Grit has been removed from
backing. Avoid this area of drum, or replace
abrasive strip.