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SYMPTOM
Motor does not run when start but-
ton is pushed
Motor overheats
Spindle overheats
POSSIBLE
CAUSE(S)
1. No power to motor
2. Blown fuse on control box
3. Defective switch or contactor
1. Low voltage to motor
2. V-belts too tight
3. Too deep or too fast a cut
4. Worn contacts in contactor
1. Poor quill bearing lubrication
2. Spindle bearings too tight
3. Mill drill operated at high speeds
for extended period
CORRECTIVE
ACTION
1. Check electrical connector and
circuit breaker or fuse
2. Correct wiring problem and replace fuse
3. Replace defective parts
1. Check voltage
2. Tension belts properly
3. Reduce cut depth or speed
4. Replace contactor
1. Lubricate bearings with bearing grease
2. Adjust bearings so that spindle
does not bind
3. Allow mill drill to cool
Lack of power at spindle
V-belts loose
Tension V-belts properly
Cutting tool chattering
1. Spindle bearings loose
2. Table is loose
3. Worn spindle bearings
4. Head clamp bolts loose
1. Tighten bearings
2. Adjust table and saddle gibs
3. Replace bearings
4. Tighten bolts
Spindle does not return to full
1. Poorly adjusted return spring
1. Increase return spring tension
"up" position
2. Worn return spring
2. Replace return spring
Excessive backlash in lead screws
Worn lead screw nuts
Replace lead screw nuts
Excessive noise
1. Loose spindle bearings
1. Adjust bearings properly
2. Loose motor pulley
2. Tighten pulley set screws
Excessive play in table
Table is loose
Adjust table gibs properly
9
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