Grizzly MODEL G0765 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.	Emergency stop button engaged or at fault.	1.	Press side tab in and lift switch cover. Press On
start or a circuit				button to reset; replace if not working properly.
breaker trips.	2.	Variable speed dial in OFF position or at	2.	Turn variable speed dial past "0". Ensure dial has
		fault.		correct voltage. Replace if faulty.
	3.	Spindle direction switch turned to "0" or at	3.	Turn spindle direction switch to "F" or "R". Ensure
		fault.		dial has correct voltage. Replace if faulty.
	4.	Blown fuse.	4.	Replace fuse/ensure no shorts (Page 58).
	5.	Incorrect power supply voltage.	5.	Ensure correct power supply voltage.
	6.	Power supply circuit breaker tripped or fuse	6.	Ensure circuit is sized correctly and free of shorts.
		blown.		Reset circuit breaker or replace fuse.
	7.	Wiring open/has high resistance.	7.	Check/fix broken, disconnected, or corroded wires.
	8.	Motor brushes at fault.	8.	Remove/replace brushes (Page 59).
	9.	On/Off switch at fault.	9.	Replace switch.
	10. Motor at fault.		10. Test/repair/replace.

Machine stalls or is	1.	Feed rate/cutting speed too fast.	1.	Decrease feed rate/cutting speed.
underpowered.	2.	Wrong workpiece material.	2.	Use correct type/size of metal.
	3.	Machine undersized for task.	3.	Inspect and replace if at fault.
	4.	Motor overheated.	4.	Use sharp bits; reduce feed rate/depth of cut.
	5.	Computer board at fault.	5.	Clean motor, let cool, and reduce workload.
	6.	Motor speed dial at fault.	6.	Test and replace if at fault.
	7.	Timing belt slipping.	7.	Tension/replace belt; ensure pulleys are aligned.
	8.	Motor brushes at fault.	8.	Remove/replace brushes (Page 59).
	9.	Pulley/sprocket slipping on shaft.	9.	Replace loose pulley/shaft.
	10. Motor bearings at fault.		10. Test/repair/replace.
	11. Motor at fault.		11. Test/repair/replace.

Machine has	1.	Motor or component loose.	1.	Inspect/replace damaged bolts/nuts, and retighten
vibration or noisy				with thread locking fluid.
operation.	2.	Pulley loose.	2.	Realign/replace shaft, pulley, setscrew, and key.
	3.	Motor fan rubbing on fan cover.	3.	Fix/replace fan cover; replace loose/damaged fan.
	4.	Motor bearings at fault.	4.	Test by rotating shaft; rotational grinding/loose shaft
				requires bearing replacement.
	5.	Cutting tool chattering.	5.	Replace/sharpen cutting tool; index tool to spindle
				centerline; use correct feed rate and cutting RPM.
	6.	Workpiece or chuck at fault.	6.	Properly secure or center workpiece in chuck or
				faceplate; replace defective chuck.

-54-	Model G0765 (Mfd. Since 12/13)

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Contents Model G0765 14 Benchtop Lathe Page Table of Contents Service Control Panel WiringContact Info IntroductionMachine Description Manual Accuracy Identification Carriage Controls ComponentsControl Panel Tailstock Rear Controls End GearsMachine Data Sheet Tailstock Info Features Safety Safety Instructions for MachineryPage Additional Safety for Metal Lathes Additional Chuck Safety Power Supply AvailabilityFull-Load Current Rating 110V Circuit RequirementsGrounding & Plug Requirements Extension CordsMinimum Gauge Size 14 AWG 50 ftSetup Needed for SetupPreparation UnpackingPackaged Components Figures Qty Installed Components Figure QtyInventory Basic steps for removing rust preventative CleanupBefore cleaning, gather the following Site Considerations Assembly Power ConnectionConnecting Power Disconnecting PowerTest Run Disengaged Spindle Break-In Recommended AdjustmentsFactory adjustments that should be verified Operations Operation OverviewInstallation Removal Device Chuck & Faceplate MountingTools Needed Qty Chuck InstallationTo install the chuck Scroll Chuck Clamping Changing Jaw SetTo change the jaw set Faceplate To mount a non-concentric workpiece to the faceplateUsing Quill TailstockTailstock Quill Specs Positioning TailstockInstalling Tooling Offsetting TailstockTo install tooling in the tailstock Removing ToolingAligning Tailstock to Spindle Centerline To offset the tailstockItems Needed Qty To align the tailstock to the spindle centerlinePage Centers Dead CentersMounting Dead Center in Spindle Removing Center from SpindleMounting Center in Tailstock Removing Center from TailstockMounting Workpiece Between Centers To mount a center in the tailstockSteady Rest Tools Needed for Installation/Removal QtyTo install and use the steady rest Installing Tool Compound Rest Four-Way Tool PostAligning Cutting Tool with Spindle Centerline Below are two common methodsTo align cutting tool with tailstock center Top ViewManual Feed Spindle SpeedSetting Spindle Speed Range Setting Spindle Direction & SpeedConfiguration Example To set spindle speed to 100 RPMPower Feed Power Feed ControlsSetting Power Feed Rate To set power feed for 0.04 in./revPrimary Threading Configuration Power Feed ConfigurationSecondary Threading Configuration End Gears40T 65T Gear 50 T Ge ar 20 TPI End Gear Configuration ExampleTo configure end gears for threading 20 TPI Page Threading Headstock Threading ControlsTo set the lathe to thread 20 TPI Feed Direction LeverThread Dial Thread Dial ChartApron Threading Controls Dial Number Thread Dial Accessories D3640-Shop Fox Tool Table PlusSchedule MaintenanceCleaning/Protecting Ball Oilers LubricationLubrication Frequency Cross Slide & Compound Slide Leadscrew & Carriage RackBedways Machine Storage Change Gear BushingTumbler Gears Preparing Lathe for StorageSymptom Possible Cause Possible Solution ServiceTroubleshooting Lathe Operation Backlash Adjustment Leadscrew End-Play AdjustmentCross Slide To remove leadscrew end playGib Adjustment To adjust cross slide and compound slide gibsHalf Nut Adjustment Fuse ReplacementTo adjust half nut To replace fuseBrush Replacement To replace motor brushesTiming Belt Tension Replacement Tensioning Timing BeltReplacing Timing Belt Wiring Wiring Safety InstructionsControl Panel Wiring Machine FrameControl Panel Wiring Photos G0765 wiring overviewMotor/Speed Sensor/ Plug Wiring 110 VACMain Description Description Labels & Cosmetics Front 255 254 256 257 259 258 253 252 261 251 260Threading Charts AppendixWarranty Card CommentsGrizzly INDUSTRIAL, INC BOX BELLINGHAM, WAWarranty & Returns