Grizzly G0758 owner manual Service, Troubleshooting, Symptom Possible Cause Possible Solution

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SECTION 7: SERVICE

Review the troubleshooting and procedures in this section if a problem develops with your machine. If you need replacement parts or additional help with a procedure, call our Technical Support at (570) 546-9663. Note: Please gather the serial number and manufacture date of your machine before calling.

Troubleshooting

Symptom	Possible Cause		Possible Solution
Machine does not	1.	Blown fuse in machine.	1.	Replace fuse/ ensure there are no shorts.
start or a breaker	2.	Chuck guard open.	2.	Close guard.
trips.	3.	Incorrect power supply voltage.	3.	Ensure power supply voltage matches circuit
	3.	Incorrect power supply voltage.	3.	Ensure power supply voltage matches circuit
				requirements.
	4.	Plug/receptacle at fault/wired wrong.	4.	Test for good contacts; correct wiring.
	5.	Power supply circuit breaker tripped or fuse	5.	Ensure circuit is sized correctly and free of shorts.
		blown.		Reset circuit breaker or replace fuse.
	6.	Motor wires connected incorrectly.	6.	Correct motor wiring connections.
	7.	Wiring is open/has high resistance.	7.	Check for broken wires or disconnected/corroded
				connections; repair/replace as necessary.
	8.	Motor brushes at fault.	8.	Remove/replace brushes.
	9.	Chuck guard safety switch at fault.	9.	Replace safety switch.
	10. Circuit board at fault.		10. Test/replace.
	11. Motor at fault.		11. Test/repair/replace.
	12. Potentiometer/variable-speed dial at fault.		12. Test/replace.

Machine stalls or is	1.	Feed rate/cutting speed too fast.	1.	Decrease feed rate/cutting speed.
overloaded.	2.	Wrong cutter type.	2.	Use correct cutter for task.
	3.	Machine is undersized for task or tooling is	3.	Use smaller or sharper tooling; reduce feed rate or
		incorrect for task.		spindle speed; use coolant fluid if possible.
	4.	Motor wired incorrectly.	4.	Ensure motor wiring is correct.
	5.	Motor bearings are at fault.	5.	Test by rotating shaft; rotational grinding/loose shaft
				requires bearing replacement.
	6.	Motor has overheated.	6.	Clean off motor, let cool, and reduce workload.
	7.	Motor is at fault.	7.	Test/repair/replace motor.

Machine has	1.	Motor or machine component is loose.	1.	Inspect/replace stripped or damaged bolts/nuts, and
vibration or noisy				retighten with thread locking fluid.
operation.	2.	Machine is incorrectly mounted or sits	2.	Tighten/replace mounting bolts in bench; relocate/
	2.	Machine is incorrectly mounted or sits	2.	Tighten/replace mounting bolts in bench; relocate/
		unevenly.		shim machine.
	3.	Motor fan is rubbing on fan cover.	3.	Replace dented fan cover or damaged fan.
	4.	Workpiece not secure.	4.	Properly clamp workpiece on table or in vise.
	5.	Excessive depth of cut.	5.	Decrease depth of cut.
	6.	Cutter/tooling is loose.	6.	Make sure tooling is properly secured.
	7.	Cutter is dull or at fault.	7.	Replace/resharpen cutter.
	8.	Bit is chattering.	8.	Replace/sharpen bit; index bit to workpiece; use
				appropriate feed rate and cutting RPM.
	9.	Motor bearings are at fault.	9.	Test by rotating shaft; rotational grinding/loose shaft
				requires bearing replacement.

-32-	Model G0758 (Mfd. Since 2/14)

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Contents Model G0758 MILL/DRILL Page Table of Contents Machine Description Manual Accuracy IntroductionContact Info Identification Right side identification Model G0758 Mfd. Since 2/14Controls Components Machine Data Sheet Table Info Safety Safety Instructions for MachineryPage Additional Safety for Mills/Drills Full-Load Current Rating Power SupplyAvailability 110V Circuit RequirementsMinimum Gauge Size 16 AWG Grounding & Plug RequirementsExtension Cords 50 ftUnpacking SetupNeeded for Setup Description QtyInventory Inventory Figure QtyBefore cleaning, gather the following CleanupBasic steps for removing rust preventative Site Considerations Lifting & Placing To lift machine and place it in positionDiameter of Mounting Hardware AssemblyBench Mounting WorkbenchLubricating Mill/Drill Joining Drill Chuck ArborTo join drill chuck and arbor Test Run Inspections Adjustments Spindle Break-InOperations Operation OverviewUsing Fine Downfeed Using Coarse DownfeedUsing DRO Downfeed ControlsTilting Headstock Headstock MovementRaising/Lowering Headstock Tools Needed QtyAxis Handwheel Table TravelGraduated Dials Tool Needed QtyInstalling Tooling Installing/Removing ToolingTo install tooling Determining Spindle Speed Spindle SpeedRemoving Tooling To remove toolingAccessories T26612-Optional Stand for Model G0758Schedule MaintenanceCleaning Protecting Lubrication Axis Leadscrews Table and Column Ways To lubricate Z-axis leadscrew To lubricate table leadscrews Table LeadscrewsHeadstock Gears To lubricate headstock gearsQuill Outside Surface Replacing DRO BatteryQuill Rack Troubleshooting ServiceSymptom Possible Cause Possible Solution Symptom Possible Cause Possible Solution Adjusting Gibs Adjusting Leadscrew BacklashBrush Replacement To inspect and replace motor brushesWiring Wiring Safety InstructionsG0758 Wiring Overview Wiring overview Model G0758 Mfd. Since 2/14G0758 Wiring GNDRear panel Parts ColumnDescription Electrical Box Headstock Description Chip Guard Labels & Cosmetics Warranty Card CommentsGrizzly INDUSTRIAL, INC BOX BELLINGHAM, WAWarranty & Returns