Apparent Extra Part - What Is This?

[Argonne]

So what is this actuator lookin' thing on the left side of the engine on my Case/IH 685. I have a couple of guesses, but my wife says I'm always wrong.

 

[MossRoad]

Planetary headlight pump?

 

[Argonne]

Planetary headlight pump?

HA, that was one of my first guesses! See honey, I'm not so dumb.

 

[MossRoad]

Is it some sort of vacuum sensor? Looks like there's wire terminals on top of it?

 

[DJ54]

Ether cold start. http://partstore.caseih.com/us/parts-search.html#epc::mr50005ar680435

 

[RickB]

Ether cold start. http://partstore.caseih.com/us/parts-search.html#epc::mr50005ar680435

**WINNER**

 

[Argonne]

Ah HA! Well, that really IS an extra part here in Texas. Thanks guys!

 

[CADplans]

I am too late to the party,,, my 584 has it,,,

 

[Gary Fowler]

So what is this actuator lookin' thing on the left side of the engine on my Case/IH 685. I have a couple of guesses, but my wife says I'm always wrong.

View attachment 477813

Looks like the previous owner also thought it was not needed and removed the electric wires to the actuator AND the small plastic line to the manifold that would feed the ether in.
Does your tractor have glow plugs? Most tractors with ether start like that didn't have glow plugs.

 

[MossRoad]

Nice!