Hello, I have a Hobart 180 and the wire feeder motor won't run. I replaced the wire feed motor and it still won't run. any ideas?

Check the Switch on the handle. Many times the two wires from the trigger down to the Mig Unit break or get a bad connection

Just a thought, have you tried feeding the wire manually to see if there aren't any obstruction through to the handle or nozzle? Hope this helps

If you completely remove wire from unit does it still slowdown and stop when you pull trigger?
If yes, then 2 most common problems are
A. Thermistor @ position PTC1 on circuit board
B. Drive Roller Motor

To diagnose, locate thermistor @ position PTC1 in upper middle part of circuit board.
It's yellowish round and about 1/2" in diameter.
Jumper Accross the 2 leads, use a small insulated screwdriver or meter probe.


1. Pull trigger on gun, when motor slows or stops then jumper the leads, if it speeds back up then it's the Thermistor
Replace with a Raychem RXE 1.85A @ 72 v
Or comparable, try EBay

2. If no change, isolate motor by removing the 2 leads and connect a 9-12 volt DC battery source, does motor spin? If not then motor is problem. If motor spins and is constant then additional troubleshooting needed, next possible issues are bad resistor or scr

it would really be a good idea to have the machine serviced at a sewing
machine shop

If the feed wheel mechanism does not move, check for voltage at the motor. If there is none present, you need to look for a failure on the control board, which may be a fuse, or even one of the SCR's. Often an 8 amp 200 volt type.

Probably the bridge rectifier. I had a 120 and thats what happened to it...

First make sure the nozzle tip is free of any debris and the wire will slide easily. Lift the case and go to the wire feed unit. Loosen the pressure nob then lift up to release the pressure wheel. Make sure the bottom wheel ( should have two grooves, one for .35 wire and the other for 025 wire.) Make sure the Wire Feed Tip is also free and it allows the wire to pass through. Pass the wire through the feeder across the drive wheel and into the hose. Allow the pressure wheel to drop, then lift the pressure know to the upright position. Turn clockwise to put tension on the wheel. Make sure the gas is OFF, turn power on, depress trigger switch. This should allow the wheel to turn and feed the wire.

Called a Hobart repair shop. They said it sounds like I need a new liner in the cable. Will replace it on Friday. Hope it works!

Hi,
To get parts for your welder you'll need to have the serial number off the tag on the case. This problem could have other causes, have you:
Checked the tension on the wire spool? You ought to be able to pull the wire by hand easily.
Checked the tension setting on the pinch rollers? Too much tension can drag down the motor speed.

You could also have a bad control card depending on which model wire feeder this is.

Regards,
Carl

A schematic would certainly help, give Hobart a call and ask for a wiring diagram. or manual. Hobart are very helpful and may even give you guidance, you may have to pay the postage, they usually fax these documents so it will not cost you anything.