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Model G9986 8" Drill Press
Symptom Possible Cause Possible Solution
Machine vibrates
excessively or is unusually
noisy.
1. Motor or component is loose.
2. Belt is slapping belt cover.
3. V-belt is worn or is loose.
4. Motor fan is rubbing on fan cover.
5. Pulley is loose.
6. Machine is incorrectly mounted to
the workbench, or the workbench is
uneven.
7. Chuck or cutter is at fault.
8. Motor bearings are at fault.
9. Spindle bearings at fault.
1.Replace component fasteners and re-tighten with
thread locking fluid.
2. Replace, realign, or retension belt (refer to
Page 14).
3. Replace belt.
4. Replace/repair dented fan cover, and replace loose or
damaged fan.
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 cut
-
ter, use appropriate feed rate and cutting RPM.
8. Check bearings, replace motor or bearings as
required.
9. Replace bearing.
Symptom Possible Cause Possible Solution
Drilling stops, but the motor
still operates.
1. The belt is loose or worn.
2. The pulley for the spindle shaft or the
motor is slipping on the shaft.
3. Bit slips in chuck.
1. Replace and/or adjust the belt.
2. To resecure the pulley, do these steps:
a. UNPLUG THE DRILL PRESS.
b. Remove the setscrew on the slipping pulley.
c. Align the flats on the pulley shaft with the setscrew
hole.
d. Reinstall and tighten the setscrew.
3. Tighten bit; inspect bit for burrs or other obstructions
that might interfere with clamping surface.
The chuck wobbles or is
loose on the spindle shaft.
1. Foreign material is stuck between the
chuck-to-spindle mating surface.
2. Damaged chuck.
1. Remove the chuck and clean and de-burr the tapered
chuck and spindle mating surfaces, then reassemble.
2. Replace.
The spindle does not retract
completely in the upper
-
most position or it binds.
1. The quill shaft is gummy with sawdust
and oil.
2. The feed shaft return spring is weak.
3. The quill deflection screw is binding
the quill.
1. Clean shaft and lubricate with a light coat of oil.
2. Increase the feed shaft return spring tension as
described on
Page 21.
3. Loosen the jam nut, and slightly turn out the screw
where the quill binds. Retighten the jam nut and
recheck for binding and looseness at all spindle loca
-
tions.
The quill has excessive
deflection.
1. The quill shaft is at fault.
2. The quill and/or bearings are worn.
1. Adjust the quill screw.
2. Replace the quill and/or bearings.
Holes drilled at an angle. 1. Table is not at 90 degrees. 1. Adjust table angle (see
Page 13).
Drill bit wobbles, holes are
oversized.
1. Drill bit installed incorrectly. 1. Remove drill bit and reinstall.
Drill Press Operations