"Unloader" valve questions

[kendelrio]

OK all-
I had a situation last week where my "unloader valve" got stuck in open(?) position and I had to whack my air compressor with a hammer to close(?) it. For those who don't know, it's located under the injection pump on the driver's side of the engine.

Here are my questions:
1. What is the "proper" term for it? I have been looking through the -10 TM, but as I'm not exactly sure what function it does (all I know is if it gets stuck you lose all air pressure and cannot build more), I cannot rely on descriptions to find it.

2. Once I find the correct name, is there a procedure to rebuild or clean this valve? I will not be opening it and lubricating because lube and contaminats=glue, and I'm only kicking the can down the road to deal with it later.

3. If there is a rebuild procedure, are there kits available for purchase?

I appreciate all information and help.

 

[simp5782]

Why not WD40 into the unloader?

I saw this mentioned in Slate's breakdown thread. I didn't want to hijack his urgent thread for this nonurgent discussion. I've had an unloader stick. I blew the moisture out with compressed air and then shot it with WD40. Problem solved. Remains solved some 5 years later with no further...

www.steelsoldiers.com

Cleaning procedure is in there.

Unloader kit is AR12719. All parts for Unloader and compressor are in the spreadsheet.

On an A2 you aren't going to get Just the Unloader off. You will be pulling the compressor head with it. It may not look possible but it is.

 

[kendelrio]

Well-
Sometimes you just have to go to the correct TM. I searched the -20...

It **is** called the unloader valve...