Troubleshooting; Parts - Jet J-A3816 Operating Instructions And Parts Manual

Troubleshooting

Problem
Spindle does Circuit breaker tripped.
not turn.
Branch circuit breaker tripped or fuse
blown.
Open wire in switch circuit.
Defective switch.
Broken drive
Spindle noisy. Damaged spindle bearings.
Worn spline.
Drill stalls. Worn drive belt.
Excessive feed rate for size of drill and
material being drilled.
No cutting fluid or improper cutting fluid.
Poorly drilled Drill dull
holes.
Lack of rigidity in hold-down method.
Speed too fast for material and drill size.
Feed too fast for material and drill size.
No or improper cutting fluid or coolant
being used.
Improperly ground drill bit.
Motor Electrical circuit fault.
overheating
Oversize drill.
Excessive feed.
No cutting fluid, or wrong fluid
Table cannot Lack of lubrication
be raised.
No speed Speed pickup out of adjustment or failed.
readout.

Parts

Ordering Replacement Parts
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.
Probable Cause
belt.
Suggested Remedy
Reset circuit breaker.
Reset branch
Repair open circuit.
Repair switch.
Replace drive belt.
Replace bearings.
Replace spline.
Check condition of belt. Replace
slipping on pulleys
Reduce feed pressure or use cutting fluid
Use correct cutting fluid.
Sharpen drill.
Check that all T-slot hold-downs are tight and that
table-lock and drill head bolts are tight.
Check spindle speed recommendations. Reduce
speed if necessary.
Reduce feed rate.
Use cutting fluid, or change to proper fluid or
coolant for material being drilled.
Check for proper angles and reliefs. Regrind to
proper geometry.
Check current draw in circuit. Make sure current
draw is the same as rating on motor plate.
Reduce drill size.
Reduce feed rate.
Use correct cutting fluid for the material and drill.
Lubricate.
Adjust gap between speed pickup and post spindle
pulley. If there is no readout on the speed
indicator, replace the speed pickup.
15
circuit breaker/replace
if glazed or
fuse.