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12.0
Troubleshooting J-4210 Belt-Disc Sander
Symptom Possible
Cause
Correction*
Machine does not start. Blown fuse or tripped circuit breaker.
Determine reason for blown fuse/tripped
breaker (such as a short circuit or motor
overload). Correct reason for fault. Replace
fuse/reset breaker.
Motor failure.
Replace motor.
Not connected to power source.
Check connections.
Motor not wired for correct voltage. Correct
motor
wiring.
Motor not connected to correct voltage
source.
Connect to proper voltage source.
Sanding belt does not
track correctly.
Sanding belt stretched unevenly. Replace
sanding
belt.
V-belt worn.
Replace V-belt.
Pulley worn.
Replace pulley.
Abrasive separates from
disc.
Improperly bonded.
Clean residual adhesive from disc. Reapply
adhesive-backed abrasive to the disc.
Sanding belt slips or
stalls when pressure is
applied.
Abrasive belt tension inadequate. Tighten
sanding
belt.
Excessive pressure being applied to
platen housing.
Reduce pressure on sanding belt (and
platen housing).
Motor belt loose.
Tighten motor belt.
Disc stalls when
pressure is applied.
Motor V-belt loose.
Tighten motor V-belt.
Frequent replacement of
sanding belt.
Too much pressure being applied to
work piece.
Reduce pressure on work piece.
Full width of belt not being used.
Stroke across sanding belt using full width of
belt surface.
*
WARNING:
Some corrections may require a qualified electrician.
13.0
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, 8:00 a.m. to 5:00 p.m. CST. Having the Model Number and Serial Number of
your machine available when you call will allow us to serve you quickly and accurately.
Non-proprietary parts, such as fasteners, can be found at local hardware stores, or may be ordered from JET.
Some parts are shown for reference only, and may not be available individually.
