Aro Scribe Stalling

[Ptychodus04]

I am having stalling issues. When you open the valve, the tool just sits there until you tap it on something hard. then, it will start to run. It will also stall during use with the same tapping required to get it moving. Tried taking it apart and cleaning out all the sludge that has built up over 10 years of use. That helped a bit but not as well as one would like. Anyone have any suggestions?

[ZiggieCie]

Your air pressure might need to go up a bit. Or rubber gaskets might be worn.

[rejd]

The biggest issue that usually causes this is the O-ring. Have you replaced that yet?

[CH4ShotCaller]

I don't have the ARO, but I have the same issues with the ME9100 sometimes. Cleaning and lube always seems to fix that, as long as the pressure is right. My smaller microjacks are sensitive to this action if some water gets into the o ring with sediments. Lube, air pressure, clean/dry and O ring replacement always takes care of that issue for me.

[Ptychodus04]

The biggest issue that usually causes this is the O-ring. Have you replaced that yet?

The o ring at the base of the stylus is new. I have not replaced any of the internal guts of the air valve.

[jpc]

If you have cleaned it and replaced the O-rings, replace the spring next. That usually fixes this. O-ring is the easiest, cheapest and most common fix, followed by the spring. If you have not changed it in ten years, I bet this will fix it.

[rejd]

Forgot about changing the spring. That is a good idea. It will weaken over time and cause stalling.

[Ptychodus04]

Sorry guys. I forgot to mention that I replaced the spring and the bushing in October. Everything is new except the internal workings.

[jpc]

Oh, man.. we've just gone to the next level...

Do you oil your tool? (Do I get kicked off for asking such a question?) If not, add a drop of air tool oil on the o-ring. Turn it on for a minute or so catching the oil coming out of the front end with a crumpled up paper towel. The idea being to not get the excess oil on your fossil, or on the walls of your lab, or on your lab tuxedo. I rarely oil tools, because I don't want them spewing oil, but it should help in this situation.

Do you have another spring and o-ring lying around? I have in the past installed new ones and no results. Then quickly add a second new one and voila... problem solved.

Edited December 18, 2014 by jpc

[Harry Pristis]

I've used my Aro tool for a long time, but not recently. I seem to remember putting a drop or two of air tool oil into the hose, letting the air flow flush the oil through the working parts.

[jpc]

on the o-ring or through the hose...l either should work.

[Malcolmt]

My ARO never stalls at 110 PSI , Do use a tool oil in the air hose maybe once a month. I have never replaced spring or O ring and the ARO has been heavily used over the years. I have Pferd that does stall if you do not oil it about once a week.

[Ptychodus04]

Thanks guys. Yes, I have oiled the tool, although that's not as dumb of a question as JPC might think. I do have an extra spring so I'll give that a try. I'll also turn up the pressure a bit to see if that helps.

[Uncle Siphuncle]

I concur w Malcolm. I own a 9100 and an ARO. 9100 runs w/o stalling at much lower pressures. 110 is a good number for the ARO.

[Ptychodus04]

Found the culprit. My new o ring was defective. Changed it out and all is well with the world. Also, now running at 110 PSI, much to the displeasure of my too small compressor!

[rejd]

That is good to hear! I ran some tests last night and mine seems to run fine at 80psi. Anything below that and it just wont run.