Grizzly G9749 owner manual Drill Operations

Symptom	Possible Cause		Possible Solution
Machine vibrates	1.	Motor fan is rubbing on fan cover.	1.	Replace/repair dented fan cover, and replace loose
excessively or is unusually				or damaged fan.
noisy.	2.	Motor or component is loose.	2.	Replace component fasteners and re-tighten with
				thread locking fluid.
	3.	Belt is slapping belt housing.	3.	Replace, realign, or re-tension belt.
	4.	V-belt is worn.	4.	Replace belt.
	5.	Pulley is loose.	5.	Remove pulley, replace with key as required, and
				re-install securely.
	6.	Machine is incorrectly mounted	6.	Make sure the mounting hardware is tight; place
		to the stand, stand is incorrectly		shims under machine.
		mounted to the floor, or the stand is
		uneven.
	7.	Chuck or cutter is at fault.	7.	Replace out-of-round chuck, replace or resharpen
				cutter, use appropriate feed rate and cutting RPM.
	8.	Motor bearings are at fault.	8.	Check bearings, replace motor or bearings as
				required.
	9.	Spindle bearings at fault.	9.	Replace bearings.

Drill Operations

Symptom	Possible Cause		Possible Solution
Drilling stops, but the motor	1.	The belt is loose, worn, or broken.	1.	Replace, realign, or re-tension belt.
still operates.	2.	Bit slips in chuck.	2.	Tighten bit; inspect bit for burrs or other obstructions
				that might interfere with clamping surface.
	3.	Pully slips on shaft.	3.	Remount or replace pully and shaft.
The chuck wobbles or is	1.	Foreign material is stuck between	1.	Remove the chuck, clean, and de-burr the tapered
loose on the spindle shaft.		the chuck-to-spindle mating sur-		chuck and spindle mating surfaces, then reas-
		face.		semble.
	2.	Damaged chuck.	2.	Replace.
The spindle does not retract	1.	The quill shaft is gummy with saw-	1.	Clean shaft and lubricate with a light coat of oil.
completely in the upper-		dust and oil.
most position or it binds.	2.	The quill lock is locked or not fully	2.	Fully release the quill lock.
		released.
	3.	The feed shaft return spring is	3.	Replace the feed shaft return spring.
		weak.
The quill has excessive	1.	The quill bearings are worn or dam-	1.	Replace the bearings.
deflection.		aged.
	2.	The quill shaft is at fault.	2.	Replace the quill shaft.
Drill bit wobbles, holes are	1.	Drill bit installed incorrectly.	1.	Remove drill bit and reinstall.
oversized.

-28- G9749 Variable Speed Drill Press