Question about GRACO INC 3900 Handheld Paint Sprayer HV3900USG

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Paint gun not shooting correctly - GRACO INC 3900 Handheld Paint Sprayer HV3900USG

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Seeing how you have really stated what the problem is (spitting, clogged, won't shut off, fan pattern wont adjust Etc) and there could be several different things wrong- lets go over some basic spraying A B C'S- always strain the paint through a strainer bag or cone this will remove any debri that might clog the tip, *THINNING when you spray or atomize paint it should always be thinned it will actually cover much better if you thin it with the appropriate solvent water for latex thinner for oil base you want to stay in the 15% range alittle bit more on hot days. The shape of the spray that comes out of the tip is called "fan pattern" or "tip fan" "fan size" you can adjust the fan pattern from 9:00 - 3::00 or sideways to straight up and down or to a small circle this is done by moving the "tip housing retainer" keep a piece of cardboard to practice and see. IMPORTANT:When you have finished spraying you need to clean the entire gun by running the right solvent through the gun untill nothing but clean solvent is coming out dissemble the gun remove and clean needle and needle housing this is not very complicated and is paramount to maintaining any spray equipment for sure the gun....

Perry Tradesman

Posted on Oct 22, 2014

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Shoots drips


Most airless spray guns spit a bit when you pull or release the trigger because the paint between the spray tip and the paint valve is under pressure but not enough to atomise the paint. If you increase the pressure you may reduce the spit to a point when you don't notice it. A blocked filter could slow the paint getting through to the tip cause lower pressure.

Jan 03, 2014 | Wagner SprayTech Wagner Airless Paint...

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Paintballs keep blowing up in my tippmann 98 custom HELP!


it could be a combination of a number of things.. most likely it has to do with the type of paint you're shooting; in regards to shell.. tippman guns are harder on paint therefore require a harder shell paint, also not all paintballs are exactly .68 caliber, meaning some a bigger and some are smaller.. could be that they're slightly to big for the bore of you barrell

Feb 13, 2013 | Tippmann 98 Custom Act Paintball Gun

1 Answer

I own this 0525151 and am trying to spray a latex fence stain. worked for a little while, then nothing. I tried thinning the paint with water and a paint thinner product recommended by the Home Depot...


We used paint sprayers every day for years.

Tips come in different sizes. With oil base paints we used the small tip like a 4-11. With latex we used bigger tips, like a 5-17. Really big spray rigs use 5-19. Tip size matters.

Another important thing is to strain the paint. The paint store sells 5-gallon-size strainers. Put the strainer over a 5-gallon bucket. Pour the paint into the bucket. Lift the strainer up, and finally grab it with your hands and squeeze the paint out. Do this in the grass and then wash out the strainer for next time. Put a lid over the paint bucket so the paint stays wet and clean.

We used high pressure sprayers, and then wrapped a filter right over the intake... but the tips would still clog. We had guns with reversible tips ... rotate the tip around, fire the gun, and the clog was gone.

Maybe your tip is getting clogged real fast. When that happens, the gun simply doesn't shoot. The old guns, we had to take them apart every time the tip clogged. I don't know about the tip on your gun.

Your paint sprayer is probably not very high pressure, which means it would clog easily if stuff was in the paint ... and latex is thick and sticky and it gets crusty as it dries.

Suggestion: I would ask Sherwin Williams about the tip. See if they sell parts or tips at the Home Depot or Sherwin Williams.

Also you can clean the gun out with lacquer thinner. See if the lacquer thinner will pass through the gun. I would take it apart and clean everything with a toothbrush, and soak it in lacquer thinner. It might work, but the home-depot-home-owner-spray-equipment is generally not made for more than a few jobs. Especially the wagner-diaphragm-type guns.

Something else you might consider for a cedar-type picket fence. A roller. Sherwin Williams sells thick shaggy roller covers that hold a lot of paint. The little cheap roller covers can't paint a fence or anything else because they're too thin. We almost never sprayed a fence. We'd put masonite along the bottom and then just threw paint up with a roller [slap it on as the customers used to claim] >>> for cedar pickets, thin the paint with water (1 gallon water per 5 of paint) so it flows into the holes and gaps. Roll the fence, and then go back and touch up with a brush or the sprayer. A paint job on a fence always looks better the next day [unlike some things] so sometimes it's best to wait 1 day before doing the brush work.

Oct 13, 2010 | Garden

2 Answers

MY CAMPBELL HAUSFELD DH5300 PAINT SPRAYER WILL NOT SPRAY PAINT.


there are several issues that can cause this problem.
I will assume you have used the sprayer before so that will eliminate an incorrect air cap. The only other issues are paint viscosity, worn parts and the number one cause improper cleaning.
Be prepared for a complete disassemble of your gun. Depending on what you spray any residue can become hard as cement and it only takes a small amount to cause problems.
Below is a link to the manual that gives an exploded view of your gun.
Hope this helps but if not please let me know and I will trouble shoot further.

http://www.cpocampbellhausfeld.com/static/manual/www.cpocampbellhausfeld.com-dh5300.pdf

May 22, 2010 | Campbell Hausfeld Air Comp Basic Spray Gun...

1 Answer

It has been so long since i used my spray gun i foregot what each knob is for


The knob on the left of the gun is your fan adjustment. turn it back towards you and it will shoot a stream of paint, turn it forward and it will shoot in a fan patter. The knob at the bottom by the air inlet is your air pressure adjustment. The knob on the back is to remove the needle and spring.
Cheers!

Feb 23, 2010 | RTO Central Pneumatic Gravity Feed Spray...

1 Answer

Will vaper spray gun do latex paint


Yes is the short answer, but you will need to use a latex wet edge extender (X.I.M) makes one most paint store should carry it. You can also use a bit of water, no more than 10% or as detailed on the label.
Keep adding the extender or water until it stops shooting spatter an has a finer mist.

Jan 18, 2010 | Vaper Titan 1.3 Mm Gravity Feed Hvlp...

1 Answer

When i start spraying with the wagner 1800 globs of paint shoot out. I replaced the atomizer but it didn't help


try using a different fluid to see what the gun does.
most of the time playing with stroke of the needle (trigger) and your atomizing air pressure will correct this.

Dec 20, 2009 | Wagner Air Tools & Compressors

2 Answers

I bought a psh1 to spray latex as the reviews


Hi


What size is the jet?
What compressor pressure are you using, LOW is good >20PSI
You will need quite a large jet for latex paint even thinned. I have tried a 1.8mm jet and that still clogs!! Consult your local spray painter with what size jet you need.

I am betting the standard size of 1.5mm is way too small, that type of gun is fine with the correct jet size.

Aug 12, 2009 | Porter Cable Gravity Feed Paint Sprayer

2 Answers

Cleaned paint gun now fan is wide open and does not change with adjustment knob.


I have to assume that this did not happen before you cleaned your gun.

If your sure everything has been cleaned then how about lubricating all the internal moving parts, like your fan adjustment.

I worked in the paint repair department at Chrysler\Jeep. This was not the regular production so we did not use the electrostatic paint guns. We used regular cup guns and touch up guns, including Devillbiss JGAs and HVLPs. The one lesson I learned was the smallest speck of paint, if not cleaned out properly can make a huge difference in the performance of your gun. The reassembly process is also critical. It's not enough to make sure everything is in the right place but also assembled to the correct torque.

If you are still having trouble after a little oil then you should disassemble the gun again. This time (if you didn't do this the first time) make sure you disassemble the tip and air cap and clean them thoroughly. Make sure you have enough tiny brushes to get to all the hard to reach spots. Make sure you have the correct cleaner for the paint you used.
Some solvents\cleaners can turn the paint left inside guns to gel then that turns rock hard requiring you to let it soak overnight.
Again make sure you oil all the internal moving parts.
Hope this helps.

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