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finish on back of hvlp needle (Earlex) - Problem?

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Forum topic by JesseTutt posted 10-29-2013 12:53 PM 775 views 1 time favorited 8 replies Add to Favorites Watch
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JesseTutt

804 posts in 775 days


10-29-2013 12:53 PM

Topic tags/keywords: spray gun hvlp spray gun cleaning earlex

Yesterday I sprayed two coats of Minwax PolyCrylic water based poly. Between coats I cleaned the front part of the spray gun (fan control, spring, nut, nozzle and wiped off the tip of the needle). After the second coat I pulled the needle out to clean all of it and I noticed white colored staining of the back end of the needle, it’s spring and the threaded knob. I have never noticed this before.

It is an Earlex 5000. I have used it for probably 5 or 6 projects each averaging 4 or 5 coats.

Does this mean that the seal around the needle is bad?
Can it be fixed without replacing the seal?

If the weather permits today (rain coming) I want to spray two additional coats this afternoon. I will see what the back of the gun looks like after these coats.

-- Jesse, Saint Louis, Missouri


8 replies so far

View Earlextech's profile

Earlextech

982 posts in 1355 days


#1 posted 10-29-2013 01:21 PM

Hi Jesse, Can you show me a picture?

-- Sam Hamory - The project is never finished until its "finished"!

View CharlesNeil's profile

CharlesNeil

1128 posts in 2535 days


#2 posted 10-29-2013 08:22 PM

Actually its not a big deal, I have the same thing on numerous guns, some “very” expensive, usually it doesnt amount to anything, but if you look just forward of the trigger, where the needle goes into the gun body you will see a nut, lightly tighten it a little, that will compress the ” O ” ring gasket and usually will cure it, or you can remove the nut and the little rubber o ring and drop by any hardware store and find one for a few cents. Often the issue is lack of use and the o ring dries out, its not a major issue unless its leaking badly.

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JesseTutt

804 posts in 775 days


#3 posted 10-30-2013 01:21 AM

Earlextech: I can’t send you a picture because I have already washed everything down to get the finish off. I recall that the spring had a white milky appearance and I observed white color on the adjustment knob. Next time I use the gun (hopefully tomorrow) I will look for the finish and take pictures.

Charles: thanks for the reply. I will check the nut and o-ring.

—Jesse

-- Jesse, Saint Louis, Missouri

View NiteWalker's profile

NiteWalker

2710 posts in 1242 days


#4 posted 10-30-2013 02:21 AM

What Charles said. Every now and then I have to tighten the needle packing a bit so prevent leaks.

-- He who dies with the most tools... dies with the emptiest wallet.

View casual1carpenter's profile

casual1carpenter

353 posts in 1140 days


#5 posted 10-30-2013 02:39 AM

I seem to remember Earlex using a grease type lubricant on the back of the needle in the o-ring area to help with friction yet help maintain a seal? As a HVLP unit i would question why the pressure is sufficient to alter the material flow path. I know that I have had issues and found small deposits deeper in the gun from inadequate cleaning on my part.

View firefighterontheside's profile

firefighterontheside

4472 posts in 521 days


#6 posted 10-30-2013 02:53 AM

Do you lubricate the needle with some mineral spirits when you clean it. I think it’s more important when using water based products. Obviously when using oil based products you are cleaning with mineral spirits anyway, but you have to remember to lube after cleaning with water.

-- Bill M. I love my job as a firefighter, but nothing gives me the satisfaction of running my hand over a project that I have built and just finished sanding.

View Earlextech's profile

Earlextech

982 posts in 1355 days


#7 posted 10-30-2013 01:06 PM

My first thought is that it is nearly impossible to get finish on the spring since the “gland seals” that Charles speaks of are well before the spring and in a totally separate compartment.

Second, the gland nut should be tightend enough to stop fluid from coming backwards out of the needle passage but not so tight that the needle doesn’t move easily.

As for lubrication – I lube every time I clean up after solvent based material, every third time after water based material. The lube I use is mineral oil. After cleaning the needle wipe a light coat of mineral oil on the pointed shaft of the needle. Now when you push the needle into the gun that oil will gather on the gland seals, keeping them moist and pliable for years to come. I’ve had mine in my gun for 8 years so far.

-- Sam Hamory - The project is never finished until its "finished"!

View NiteWalker's profile

NiteWalker

2710 posts in 1242 days


#8 posted 10-30-2013 07:52 PM

Mineral oil is what I use to lube the needle too.

For tightening, I usually tighten until the needle sticks, then back it off 1bout 1/8 of a turn or so. That usually gets me right where I need to be.

-- He who dies with the most tools... dies with the emptiest wallet.

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