I have a Hobart handler 120/90amp wire feed welder.When i try to weld,all i get is a small spark.I turn it off,turn it on and it does it again.The wire feed works good,it just sparks,but will not keep welding.Thanks,Jerry

Section 12 - Parts List - Hobart Champion 4500 Owner's ...

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Section 12 - Parts List - Hobart Champion 4500 Owner's Manual. Engine driven welding generator. Show thumbs.

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Check the selector switch with an ohm meter. Unplug the unit, ground to chassis and probe the contacts while turning the switch on and off.

Newer welders as hobart and miller are set up from factory to use innershield wire therefore polarity is set up as inverse. Check inside your machine and check that ground cable is on negative side. Your gas must be mix argon/CO2 or pure CO2 (not recommended).
Other potential problem is wire not being a mild steel one. Check you have gas flow out of your nozzle.
That's all I can think of.

Make sure that the ground clamp is securely fastened to the workpiece.
Ensure that the power pin is fully seated into the housing where it receives the current.
Ensure that voltage and amperage settings are correct.

go to praxair ,air gas s j smith or any welding shop they can get it for you,

Locate your locale Hobart welding distributer, or contact hobart, the are nice people and will give you all the avice you need.

If it is new i would not play around with the welder Just take it back to where you bought it get them to replace it under warranty

check main contactor or diode bank.

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.

Some welders control wire speed with the amps control, some control amps with the wire speed control. You might try turning things up until it runs smoothly without pushing back. If you're new at welding, it does take some practice until it feels right.