Jet JWL-1221VS - 15.0 Troubleshooting; Common Problems and Solutions

23
15.0 Troubleshooting the JWL-1221VS Lathe
Table 3
Trouble Probable Cause Remedy
Motor fails to develop
full power
Power line overloaded Correct overload condition
Undersize wires in power supply
system.
Increase supply wire size.
Worn motor Replace motor
Motor or spindle stalls
or will not start
Excessive cut Reduce depth of cut
Improper belt adjustment, or worn or
broken belt
Adjust or replace belt as needed
Motor brushes are worn or damaged Replace brushes
Worn spindle bearings Replace bearings
Worn motor Replace motor
Excessive vibration Workpiece warped, out of round, has
major flaw, or was improperly prepared
for turning
Correct problem by planing or sawing
workpiece, or discard entirely and use
new workpiece
Worn spindle bearings Replace spindle bearings
Worn drive belt Replace drive belt
Motor mounting fasteners are loose Tighten fasteners
Lathe on uneven surface Place lathe on flat surface
Tools tend to grab or
dig in
Dull tools Keep tools sharp
Tool support set too low Reposition tool support height
Tool support set too far from work piece Reposition tool support closer to work
piece
Improper tool being used Use correct tool for operation
Tailstock moves when
applying pressure
Cam lock nut needs adjusting Tighten cam lock nut
Lathe bed and tailstock mating surfaces
are greasy or oily
Remove tailstock and clean surfaces
with a cleaner/degreaser. Re-apply light
coat of oil to lathe bed surface.
RPM shown on digital
readout is incorrect
(lower than speed
chart)
Voltage too low (95 or under) Request voltage check from power
company
E1 shown on digital
readout
Overheating in heat sink Reduce depth of cut
E3 shown on digital
readout
Voltage too high Request voltage check from power
company
E4 shown on digital
readout
Overload limiter in circuit board
activated
Reduce depth of cut
E6 shown on digital
readout
Spindle sensor not working Check connectors of spindle sensor
cord to switch box
Readjust sensor closer to sensor collar
Replace sensor collar (p/n JWL1221VS-
110)
Replace sensor set (p/n JWL1221VS-
112)