Lincoln welder problem

offroadin 88xj

Well-Known Member
Joined
Mar 6, 2010
Location
winston-salem
I have a Lincoln sp175 plus welder it started making a buzzing noise so I took it apart and the noise is the gas solenoid and its spraying gas out the nozzle without the trigger pulled so I got a new solenoid and its doing the same thing anyone good with welders that can point me in the rite direction on wht to look at next
 
So if you disconnect the power to the solenoid it stops spraying?
 
I am not good with welders but back in my one our photo machine days when something stayed open that meant the board that controls it is the next in line to check. Unless it uses ground then the wiring...
 
I’m just guessing here but since there is one switch that controls three things,

Gas flow, wire feeder, and energizes the circuit. I would guess that each one has a separate relay/contactor. The wire feed and current for welding may be triggered by the same relay, so I’d look for a separate relay just for the gas solenoid.

I don’t know anything about that specific machine or how it’s put together but that is my theory to track down.

Typically this is how the gas flow is turned on just before welding current is energized and the wire is fed.


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Mac5005 said:
I’m just guessing here but since there is one switch that controls three things,

Gas flow, wire feeder, and energizes the circuit. I would guess that each one has a separate relay/contactor. The wire feed and current for welding may be triggered by the same relay, so I’d look for a separate relay just for the gas solenoid.

I don’t know anything about that specific machine or how it’s put together but that is my theory to track down.

Typically this is how the gas flow is turned on just before welding current is energized and the wire is fed.


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Click to expand...



Just looked at the wiring diagram, looks like it’s all controlled via the PC board. You could try to bypass the solenoid wires from PC board and tie them into
The arc voltage wires from the PC board and see if it works as it should.
 
Talked to a welder repair guy today and he said it sounds like the pc board is messed up anyone know where to get one fairly cheap he priced a new one for around 450 or rebuild mine for around 300
 
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