Craftsman 351.211970 Operator's Manual download pdf (Page 9)

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

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Craftsman 351.211970 Operator's Manual Page 9

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