Help with new to me snap on pro mig 185

[123hotchef]

Hi People just setting up my new to me mig and having a few problems the main one being that the gas is flowing constantly is there not a solenoid that should cut the gas off until the trigger is pressed?

Also wire installation I presume it gets feed the wire off of the top of the spool, and is there something missing that shouls hold the 5kg reel onto the holder?

Pics to follow.

Lee

 

[123hotchef]

 

[mike 109444]

Well I think you are missing a spacer for the spool (15kg spool would not need one) Use some drain pipe as a spacer.
Ref the gas valve. As the torch does not look to be a euro type then there may be a valve in torch OR in side machine. The torch trigger should feel slightly harder to press if it has gas valve in it than if it is just operating a switch BUT if valve is stuck in (on) then you wont feel it! two choices, One take torch apart and look for gas valve or Two take side off machine (unplug from power!!) and follow the gas pipe from rear of machine or from rear of torch asy ans look for a valve.

 

[Bigjoe]

Hmmm sorry about that Lee, hopefully the valve is just sticking, hope it behaves shortly,I managed to run a 5kg spool without a spacer,it was a different brand though, I'm not sure if it makes a difference.

 

[123hotchef]

Well I think you are missing a spacer for the spool (15kg spool would not need one) Use some drain pipe as a spacer.
Ref the gas valve. As the torch does not look to be a euro type then there may be a valve in torch OR in side machine. The torch trigger should feel slightly harder to press if it has gas valve in it than if it is just operating a switch BUT if valve is stuck in (on) then you wont feel it! two choices, One take torch apart and look for gas valve or Two take side off machine (unplug from power!!) and follow the gas pipe from rear of machine or from rear of torch asy ans look for a valve.

Thanks for the reply Mike that will be a job for tomorrow then good idea on the drain pipe spacer I like it. I will let you know about the torch.

 

[123hotchef]

Hmmm sorry about that Lee, hopefully the valve is just sticking, hope it behaves shortly

I hope so too cant be wasting gas its expensive lol. I dont suppose you have the spacer for the spool knocking about do you.

 

[123hotchef]

I sold my 15kg spool to some Essex boy @HMB

 

[Bigjoe]

I never had a spacer, ummm I'll have a rummage but I'm sure I didn't mate

 

[123hotchef]

I never had a spacer, ummm I'll have a rummage but I'm sure I didn't mate

its ok i have a empty 5kg spool here

 

[mike 109444]

If the gas valve is in side machine and sticking then they can usually be striped and cleaned.
In the 2nd pic the metal slug with a black rubber tip is what seals off the gas. Crap can get in the hole it should seal off or the rubber tip can fail to seal correctly.
Take apart, clean sealing seat (cotton buds are good for this) clean the tip of rubber and refit.

 

[123hotchef]

Well I think you are missing a spacer for the spool (15kg spool would not need one) Use some drain pipe as a spacer.
Ref the gas valve. As the torch does not look to be a euro type then there may be a valve in torch OR in side machine. The torch trigger should feel slightly harder to press if it has gas valve in it than if it is just operating a switch BUT if valve is stuck in (on) then you wont feel it! two choices, One take torch apart and look for gas valve or Two take side off machine (unplug from power!!) and follow the gas pipe from rear of machine or from rear of torch asy ans look for a valve.

Torch taken apart no valve just 2 wires It must be a euro torch. Correct. Next to find gas valve inside machine then.

 

[123hotchef]

If the gas valve is in side machine and sticking then they can usually be striped and cleaned.
In the 2nd pic the metal slug with a black rubber tip is what seals off the gas. Crap can get in the hole it should seal off or the rubber tip can fail to seal correctly.
Take apart, clean sealing seat (cotton buds are good for this) clean the tip of rubber and refit.

that is definitely a job for tomorrow

 

[123hotchef]

If the gas valve is in side machine and sticking then they can usually be striped and cleaned.
In the 2nd pic the metal slug with a black rubber tip is what seals off the gas. Crap can get in the hole it should seal off or the rubber tip can fail to seal correctly.
Take apart, clean sealing seat (cotton buds are good for this) clean the tip of rubber and refit.

I think the first thing to do then is test the coil to make sure it is not open

 

[mike 109444]

If coil was "OPEN" then valve would not operate at all. IF supply to coil is stuck ON (shorted transistor or relay) then you would have a permanently open valve when power applied. Couple of ways to check. Does gas flow even if NO power applied ? if yes then valve is gummed up/stuck open if NO then apply power, but NO trigger press. Does gas flow ? If yes then coil is being energized by electronic device stuck ON. If NO then pull trigger (gas now flows) then release trigger . Does gas still flow if Yes then stickING valve OR stickING electronic device relay etc.

 

[123hotchef]

If coil was "OPEN" then valve would not operate at all. IF supply to coil is stuck ON (shorted transistor or relay) then you would have a permanently open valve when power applied. Couple of ways to check. Does gas flow even if NO power applied ? if yes then valve is gummed up/stuck open if NO then apply power, but NO trigger press. Does gas flow ? If yes then coil is being energized by electronic device stuck ON. If NO then pull trigger (gas now flows) then release trigger . Does gas still flow if Yes then stickING valve OR stickING electronic device relay etc.

Thanks again for the reply Mike, I am learning, Ok just re checked no gas flow when machine is switched off, when switched on no gas flow until trigger is pressed then one triger is released the gas continues to flow turn machine off gas still flows. Also if the machine is still switched on and the gas is flowing turning the gas off at the reg then turning it back on again stops the flow. So it is just looking like a dirty/sticking valve.

I will strip it and clean it tomorrow do u use anything special on the cotton buds?

 

[mike 109444]

Thanks again for the reply Mike, I am learning, Ok just re checked no gas flow when machine is switched off, when switched on no gas flow until trigger is pressed then one triger is released the gas continues to flow turn machine off gas still flows. Also if the machine is still switched on and the gas is flowing turning the gas off at the reg then turning it back on again stops the flow. So it is just looking like a dirty/sticking valve.

I will strip it and clean it tomorrow do u use anything special on the cotton buds?

IPA or some other mild spirit even a SMALL bit of WD40 to clean seat and plunger bore then wipe off with clean bud.
It may well be some crap that was in one of the pipe/reg fitting has got through. Does not take much.

 

[123hotchef]

I might have some in the garage defiantly got brake cleaner and acetone and meths not sure about IPA probably somewhere watch this space!

 

[mike 109444]

Brake cleaner is usually IPA

 

[HMB]

I sold my 15kg spool to some Essex boy @HMB

Long gone now

 

[skotl]

It's healthy to get stuck inside your welder, Lee, and learn how it works by having to fix it

When you do get it going then I was wondering about the pictures of the spool - it may just be dust on the camera / phone lens but the wire didn't look in great condition to me. Does it have any surface rust on it? Might be wrong - my eyes are old!