Grizzly g0749, g0746 owner manual Service, Troubleshooting, Motor & Electrical

Page 77

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

Motor & Electrical

Symptom	Possible Cause		Possible Solution
Machine does not	1.	EMERGENCY STOP button depressed/at	1.	rotate button head to reset. Replace if at fault.
start or a circuit		fault.
breaker trips.	2.	Main power switch OFF or at faul.	2.	turn main power switch ON or replace if at fault.
	3.	incorrect power supply voltage or circuit	3.	Ensure correct power supply voltage and circuit
		size.		size.
	4.	power supply circuit breaker tripped or fuse	4.	Ensure circuit is sized correctly and free of shorts.
		blown.		Reset circuit breaker or replace fuse.
	5.	Motor wires connected incorrectly.	5.	Correct motor wiring connections. (Page 87).
	6.	thermal overload relay has tripped.	6.	reset; adjust trip load dial if necessary; replace.
	7.	Contactor not energized/has poor contacts.	7.	test all legs for power/replace if at fault.
	8.	Wiring is open/has high resistance.	8.	Check/fix broken, disconnected, or corroded wires.
	9.	Motor is at fault.	9.	test/repair/replace.

Motor stalls or is	1.	gearbox at fault.	1.	select appropriate gear ratio; replace broken or
underpowered.				slipping gears.
	2.	Belt(s) slipping.	2.	tension/replace belt(s); ensure pulleys are aligned.
	3.	Motor wired incorrectly.	3.	Wire motor correctly.
	4.	Motor bearings at fault.	4.	test/repair/replace.
	5.	Motor overheated.	5.	Clean motor, let cool, and reduce workload.
	6.	Contactor not energized/has poor contacts.	6.	test all legs for power/replace if at fault.
	7.	Motor overheated. Contactor not energized/	7.	Clean motor, let cool, and reduce workload. Test all
		has poor contacts.		legs for power/replace if at fault.
	8.	Motor at fault.	8.	test/repair/replace.

Loud, repetitious	1.	pulley set screws or keys are missing or	1.	inspect keys and set screws. Replace or tighten if
noise coming from		loose.		necessary.
lathe at or near the	2.	Motor fan is hitting the cover.	2.	tighten fan, shim cover, or replace items.
motor.

Motor overheats.	1.	Motor overloaded.	1.	allow motor to cool; reduce load on motor.

Motor is loud when	1.	Excessive depth of cut or feed rate.	1.	decrease depth of cut or feed rate.
cutting, or bogs	2.	spindle speed or feed rate wrong for	2.	refer to the feeds and speed charts in Machinery's
down under load.		cutting operation.		Handbook or a speeds and feeds calculator on the
				internet.
	3.	Cutting tool is dull.	3.	sharpen or replace the cutting tool.

Model G0746/G0749 (Mfg. Since 3/13)

-75-

Image 77

Contents GEAR-HEAD Lathe Page Table of Contents 117 113Contact Info IntroductionMachine Description Manual Accuracy Identification Controls Components Master Power SwitchTailstock CarriageEnd Gears Control Panel Safety Foot BrakeMachine Data Sheet Tailstock Info Construction Model G0749 16 X 40 Heavy Duty Lathe 13-3/4 12.75 qt Safety Instructions for Machinery SafetyPage Additional Safety for Metal Lathes Additional Chuck Safety Circuit Requirements for AvailabilityFull-Load Current Rating To correct the phase polarity of the incoming power supply Correcting Phase PolarityConnection Type Grounding InstructionsNeeded for Setup SetupPreparation UnpackingPackaged Components Figure InventoryMain Components Figure Qty Basic steps for removing rust preventative CleanupBefore cleaning, gather the following Site Considerations To lift and move the lathe Lifting & PlacingHEAvy LifT Machine Base Concrete Anchoring to Floor LevelingAnchoring to Concrete Floors Location of headstock jack screws AssemblyAdding Coolant Lubricating Lathe Power ConnectionTest Run To connect lathe to powerTest run consists of verifying To test run your machineEmergency Lever FeedSpindle Break-In Recommended AdjustmentsFactory adjustments that should be verified Operation Overview OperationsChuck & Plate To install the camlock studsTo install the chuck Installation Removal DevicesChuck Installation Registration mark locations Registration MarksTo remove the chuck Chuck RemovalScroll Chuck Clamping To change the jaw set Changing Jaw SetMounting Workpiece Jaw ChuckFaceplate Drive PlateInstalling Tooling Using QuillTailstock Positioning TailstockTo install tooling in the tailstock Offsetting TailstockRemoving Tooling To offset the tailstockTo align the tailstock to the spindle center- line Aligning Tailstock to Spindle CenterlineItems Needed Qty Dead Centers CentersMounting Dead Center in Spindle Live CentersRemoving Center from Spindle Mounting Center in TailstockMounting Workpiece Between Centers Removing Center from TailstockTools Needed Qty To install and use the steady restSteady Rest Carriage & Slide Locks Follow RestCompound Rest Four-Way Tool Post To install a tool in the tool postTool Needed Qty To set the compound rest at a certain angleBelow are two common methods Aligning Cutting Tool with Spindle CenterlineTo align the cutting tool with the tailstock center Top ViewManual Feed Micrometer StopCarriage Handwheel Cross Slide HandwheelDetermining Spindle Speed Setting Spindle SpeedSpindle Speed Configuration Example Power FeedPower Feed Controls Dial Selection Lever Setting Power Feed RateLeadscrew UP Secondary Configuration Primary ConfigurationAlternate Configuration End GearsTo configure end gears for threading 16 TPI End-Gear Configuration ExampleTo set levers and dials for 16 TPI ThreadingHeadstock Threading Controls Thread Dial Apron Threading ControlsThread dial chart Thread Dial ChartHeadstock Pitch Turning Controls Pitch TurningFor example To set levers and dials for 1.25 MPLeadscrew UP Biological & Poison Hazard Coolant SystemChip drawer Model G0746/G0749 Mfg. Since 3/13 Chip DrawerG0688-Tool Post Grinder AccessoriesH6095-Digital Readout DRO H7991-Mini Mag Base Indicator SetT10118-Tailstock Digital Readout Schedule MaintenanceCleaning/Protecting Headstock LubricationLubrication Frequency To change the headstock oil Quick-Change GearboxLongitudinal Leadscrew ApronOne-Shot Oiler Ball Oilers Ball OilersHandling & Care Hazards Coolant System ServiceChanging Coolant Adding CoolantSee Hazards on To add coolantBringing Lathe Out of Storage Machine StoragePreparing Lathe for Storage Troubleshooting ServiceSymptom Possible Cause Possible Solution Motor & ElectricalLathe Operation Symptom Possible Cause Possible Solution Cross Slide Backlash AdjustmentCompound Rest Gib Adjustment Leadscrew End-Play AdjustmentTo adjust the cross slide gib Cross Slide GibSaddle Gib Compound Slide GibBelts To adjust the saddle slide gibTensioning V-Belts To tension the V-BeltsReplacing V-Belts Adjusting Brake Brake & SwitchGap Removal Gap Insert Removal InstallationReplacing Brake Gap Installation Wiring Safety Instructions WiringElectrical Cabinet & Motors Circuit Diagram Control Rod PartsControl Rod & Brake Description Control Rod & Brake Parts ListBody G0746-49 Bed & Body Parts List Gears Description Headstock Gears Parts ListFeed Direction Control Left Spindle Speed HeadstockControls Description Headstock Controls Parts ListChange Quick-Change Gearbox Parts List PR12M EXT Retaining Ring 35MM 100 Model G0746/G0749 Mfg. Since 3/13 Saddle Saddle Parts List REF Description Slides104 Model G0746/G0749 Mfg. Since 3/13 ApronApron Parts List PCAP26M CAP Screw M6-1 X Model G0746/G0749 Mfg. Since 3/13 107 Tailstock Leadscrew 1601 1603 1611 1604 1605 1608 1602 1606 1607 1609 1610 Electrical CabinetAccessories Front Machine Labels Rear Machine Labels Threading AppendixDiametral & Modular Pitch Chart Comments Warranty CardBOX BELLINGHAM, WA Grizzly INDUSTRIAL, INCWarranty & Returns