20 Most Recent Miller Trailblazer 302 Welder Generator 907217 907216 - Page 7 Questions & Answers

the output is ac not dc

The 10 gage wire large one is the positive power lead. the 2 smaller wires are not polarity sensitive and go to activate the wire feed roller and supply power to the gun electrode via a relay.

you will need a welder with around 500 amp capacity to weld 8" steel what capacity welder have you got

10w-30 is recommended down to 0degrees F. 5w-30 when below 0. Use a synthetic oil. They are better all around.

Also check to ensure your air compressor is able to supply the recommended CFM that Is required by your Machine, check the condition of your plasma torch front end parts, is your plasma machine connected directly to the mains, if using an extension cord is must be able to supply the correct voltage and current to power your unit

Try here https://www.millerwelds.com/support/manuals-and-parts

Is that not a three phase unit?

Try here https://www.millerwelds.com/support/manuals-and-parts

Have you stripped and cleaned out carburettor? sounds like a blocked idle jet?

Try here https://www.millerwelds.com/support/manuals-and-parts

Not as old as me! how can I help?

Try here https://www.millerwelds.com/support/manuals-and-parts

Try here https://www.millerwelds.com/support/manuals-and-parts

5w-30 will be OK. Synthetic gives extra protection.

Check brushes.

Air filter maintenance has a lot to do with it, but generally dirty air filter will let dirt into the cylinders and eventually score the cylinders, thus letting oil up on the head gasket. The heads or block could be warped. The valve guides could be worn.

go to www.millerwelds.com>files>ow there is a pdf version of the user manual and page 30 shows how to reset the machine if the link doesn't work for you go google and type in -- password resetting for miller mig welder 450-- and there are plenty of pages and pdf version that may help

fuse for the motor , broken wire in the lead problem trigger switch

Unfortunately, since this machine is CV (constant voltage) it is strictly for Mig or Flux-cored welding. Anything that is stick welded can be welded with Mig. All you need is a compatible Mig welder. CP 302 MIG Welder MillerWelds

Well it can be a number of things. If you are not a certified tech, I would recommend taking your machine to a authorized service center. If you feel comfortable checking the brushes, that is what I would check first. Other than that, it could be rheostat, R2, SR2, or generator windings. I am including the owners manual. https://www.millerwelds.com/files/owners-manuals/O458M_MIL.pdf