Grizzly G4003G owner manual Service, Troubleshooting, Motor & Gearbox

SECTION 7: SERVICE

Troubleshooting

Review the troubleshooting and procedures in this section to fix your machine if a problem develops. If you need replacement parts or you are unsure of your repair skills, then feel free to call our Technical Support at (570) 546-9663.

Motor & Gearbox

Symptom	Possible Cause		Possible Solution
Motor will not	1.	Main power panel switch is OFF.	1.	Turn the main power panel switch ON.
start.	2.	Emergency switch is pushed in.	2.	Rotate emergency switch so it pops out.
	3.	Circuit breaker or fuse has tripped.	3.	Seek an electrician to troubleshoot and repair the
				shop power supply.
	4.	No voltage or open connection.	4.	Test circuit, replace wires and connections as
				required.
	5.	Capacitor is at fault.	5.	Replace capacitor.
	6.	Motor direction switch is at fault.	6.	Replace switch.
	7.	Power switch or magnetic contactor is at	7.	Replace power switch or magnetic contactor.
		fault.
	8.	Motor is at fault.	8.	Replace motor.
Fuses or circuit	1.	Short circuit in line cord or plug.	1.	Inspect cord or plug for damaged insulation and
breakers trip				shorted wires.
open.	2.	Short circuit in motor or loose connections.	2.	Inspect all connections on motor for loose or shorted
				terminals or worn insulation.
	3.	Incorrect fuses or circuit breakers in power	3.	Install correct fuses or circuit breakers.
		supply.
Machine is	1.	Excessive depth of cut.	1.	Decrease depth of cut.
loud belt slips	2.	RPM or feed rate wrong for operation.	2.	Refer to RPM feed rate chart for appropriate rates.
when cutting.	3.	Dull cutters.	3.	Sharpen or replace cutters.
Overheats or	4.	Belt is slipping.	4.	Remove grease or oil on belt or pulleys/tighten belt
bogs down in the				tensioner against low range belt.
cut.	5.	Belt is at fault.	5.	Replace belt.
Gear change	1. Gears not aligned in headstock.		1.	Rotate spindle by hand until gear falls into place.
levers will not
shift into position.
Loud, repetitious	1.	Pulley set screws or keys are missing or	1.	Inspect keys and set screws. Replace or tighten if
noise coming		loose.		necessary.
from machine	2.	Motor fan is hitting the cover.	2.	Tighten fan or shim cover, or replace items.
at or near the
motor.
Motor is loud	1.	Excessive depth of cut or feed rate.	1.	Decrease depth of cut or feed rate.
when cutting.	2.	RPM or feed rate wrong for cutting operation.	2.	Refer to RPM feed rate chart for appropriate rates.
Overheats or	3.	Cutting tool is dull.	3.	Sharpen or replace the cutting tool.
bogs down in the	4.	Gear setup is too tight, causing them to bind.	4.	Readjust the gear setup with a small amount of
cut.				backlash so the gears move freely and smoothly
				when the chuck is rotated by hand.
Gear change	1.	Gears not aligned in headstock.	1.	Rotate spindle by hand until gear falls into place.
levers will not
shift into position.

G4003G Gunsmith's Lathe -35-