20 Most Recent Miller Trailblazer 302 Welder Generator 907217 907216 - Page 2 Questions & Answers

check fuel lines and filter maybe float stuck in carb

check gas line and filter maybe float stuck in carb

If it is only momentary, it may be sand in the contactor- blow unit clean or as best you can and "tent" some poly plastic over the contactor with duct tape to seal it to cabinet. Use the heavier 6 mil stuff or fabrcate a cover from phenolic sheet or fishboard (flame proof material looks and feels like cereal box cardboard)- old circuit boards from derilect equipment, etc also can work, the idea is to dust proof the contactors- the heavy one especially.. Check to make sure it does not melt either as it will get exrra warm there. They were made for a metal shop not a desert. No offense intended.Also check to make sure the circuit breakers CB1 and CB4 are sound- they can fatigue fail and/or wire connections work loose and become intermittent under load.. Also cycle the switches a few times to clear the crud. If you have LPS1 available- it can help clean the contacts and dries without residue. Also check the trigger switch and replace it if you can find no other obvious faults with an ohm meter. If not, the microswitch might come apart to clean up the contacts. It "might" even be interchangeable with.derilect mcrowave interlock switches- which would need to be sealed with silicone out there. If you do not have the manual for it from Miller, you can download it from their website http://www.millerwelds.com/service/ownersmanuals.php?modelthen just scroll down to the flavor of 302 you have. Engine controls are the only real difference between the three modelsLesser possibilities are an issue witht he current sense coil- PLG-6 attaches there- also check that connection. They would be wires 141, 142, 143, 144 They go to the main board.Also check RC-12-1 and RC-12-3 these will be on the PC-2 board- they are the voltage sense wires and they go to switch 1. Also check SR-1 the rectifiers- make sure they are not loose or have faulty soldering- this can drop out the voltage too.

Blow cabinet clean of dust and check connections in cabinet and handle. first, Then check the wires to the step up solenoid and make sure they have sound connections and that solenoid is mounted securely. If you do much outside at night, have someone watch with the cabinet open and see where it sparks when the engine drops speed. Int he dark, even small sparks you would not see inthe daytime or the shop apper reasonably well.

if u want to use grinding machine, take power from auxillary source, it should be in machine,single phase supply. remote and grinder power do not have anything with this problem.

have you had the cables tested,welding weares them out.how old are they a welder is like a big old coil or armature the contact points on it gets corroded causing it to work harder causing your bog

Hi:

Probably your machines just overloaded; the engine will run and produce voltage but no weld output. Check your fuses F1 and F2, if they are open replace them.
Both fuses are located at left hand side of machine, open it and you will find them on the bracket.

Good Luck.

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i have the same machine, had same problem, changed broken springs on carburator and choke, problem gone. air gas ( authorized service tec. showed me how)

Hi:

I suposse that you are using a wire briefcase (?), if so there is only one lead from the wire feeder to connect to the engine drive, that one goes to (+) stinger side and the briefcase has one volt sensing clamp, this one goes to your metal piece as same with the ground cable from the engine drive. If still you don't have a spark using the wire feeder but you do with the engine drive (stick welding) then your problem is your gun.

Email back if need more troubleshooting.

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Check the coil and connections to the 24 volt contactor.