Grizzly G9749 - Manual (Page 30)

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G9749 Variable Speed Drill Press
Symptom Possible Cause Possible Solution
Machine vibrates
excessively or is unusually
noisy. 1. Motor fan is rubbing on fan cover.
2. Motor or component is loose.
3. Belt is slapping belt housing.
4. V-belt is worn.
5. Pulley is loose.
6. Machine is incorrectly mounted
to the stand, stand is incorrectly
mounted to the floor, or the stand is
uneven.
7. Chuck or cutter is at fault.
8. Motor bearings are at fault.
9. Spindle bearings at fault.
1. Replace/repair dented fan cover, and replace loose
or damaged fan.
2. Replace component fasteners and re-tighten with
thread locking fluid.
3. Replace, realign, or re-tension belt.
4. Replace belt.
5. Remove pulley, replace with key as required, and
re-install securely.
6. Make sure the mounting hardware is tight; place
shims under machine.
7. Replace out-of-round chuck, replace or resharpen
cutter, use appropriate feed rate and cutting RPM.
8. Check bearings, replace motor or bearings as
required.
9. Replace bearings.
Symptom Possible Cause Possible Solution
Drilling stops, but the motor
still operates. 1. The belt is loose, worn, or broken.
2. Bit slips in chuck.
3. Pully slips on shaft.
1. Replace, realign, or re-tension belt.
2. Tighten bit; inspect bit for burrs or other obstructions
that might interfere with clamping surface.
3. Remount or replace pully and shaft.
The chuck wobbles or is
loose on the spindle shaft. 1. Foreign material is stuck between
the chuck-to-spindle mating sur-
face.
2. Damaged chuck.
1. Remove the chuck, clean, and de-burr the tapered
chuck and spindle mating surfaces, then reas-
semble.
2. Replace.
The spindle does not retract
completely in the upper-
most position or it binds. 1. The quill shaft is gummy with saw-
dust and oil.
2. The quill lock is locked or not fully
released.
3. The feed shaft return spring is
weak.
1. Clean shaft and lubricate with a light coat of oil.
2. Fully release the quill lock.
3. Replace the feed shaft return spring.
The quill has excessive
deflection. 1. The quill bearings are worn or dam-
aged.
2. The quill shaft is at fault.
1. Replace the bearings.
2. Replace the quill shaft.
Drill bit wobbles, holes are
oversized. 1. Drill bit installed incorrectly. 1. Remove drill bit and reinstall.
Drill Operations