Reattach Fluid Side and Test for Leaks

8:45

11:06

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Cleaning A Graco Contractor II Gun. Repair an Airless Spray Gun.

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What happens here

The final step of reassembly is reattaching the fluid side diffuser. Crucially, always squeeze and hold the trigger while screwing this part back on. This ensures the needle is retracted and prevents it from being scored by the seat, which would cause the gun to leak. Screw the diffuser on by hand until it's snug, then use the 5/8-inch wrench to fully tighten it, continuing to hold the trigger. Once securely tightened, release the trigger. Perform a trigger pull test to ensure smooth action. Finally, spray some more WD-40 on the ends and filter side of the gun to further lubricate and prevent paint from drying and getting hard. The presenter notes that if any paint was missed during cleaning, the WD-40 will help keep it from drying. Test the gun with water to check for leaks. If the gun leaks from the tip, it indicates a scored needle or seat, and the packings will need to be replaced, which can be costly (around $50-60).

Goal: Securely reattach the fluid side, lubricate, and test the gun for proper function and leaks.

Tools and materials

5/8 inch wrench — Tightening the fluid side diffuser
Graco Contractor II Gun Graco — The fully reassembled spray gun
WD-40 WD-40 — Final lubrication of gun ends and filter side

What they say

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slide into the needle, pops out, and you'll actually see the end of the needle right here. So, once it drops inside there, make sure it's all lined up. And you actually see the um the sides of the the needle come out the side right here. Once it's in there, going to drop my spring down inside. Just screw the back cap back on loosely. My hand. I'll just take my 5/8 wrench, tighten that in back up. Tighten it all the way down. That's tight. Now begin putting the end of the gun on fluid section. Now when you're putting the gun back together, you want to make sure that you're pulling the trigger. Squeeze that trigger. Otherwise, you could score that seat. It would could possibly leak. Let's screw that down by hand. Take my 5/8 wrench while I'm pulling the trigger. You'll see. And then tighten it up. Make sure it's good and tight. Now you can release the trigger and it's all Check your trigger pull. And I like to take spray some more WD40 on the ends. Get it all lubricated cuz there's there's any leftover paint after cleaning it with the lacquer thinner. The leftover paint will dry up and get all hard and the WD40 keeps it from drying up. I squirt some down in the filter side too. And now our contractor 2 gun is ready to be put back on our pump. And I'll test it with water to make sure there's no leaks. If you get any leaks coming out of the end of the gun right here, then the the seat itself is either scored or got a nick in it or something. And you're going to want to replace the packings. The packing is about $50 to $60. We like to take clean it, put it back together, see if it doesn't like leak first and then go from there. This is Chris in Idaho. How to

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