Skip to main content

Disassemble Gun for Needle/O-ring Replacement

3:12
9:19
106.2K views

At 3:12 in

How to clean & rebuild a Graco Contractor II gun. Graco Sprayer Tips.

What happens here

If the gun is leaking paint from the needle, it's time for a rebuild (recommended every two years). First, squeeze and hold the trigger. While holding the trigger, use a crescent wrench to unscrew the front part of the gun where the needle is housed. Once the front housing is removed, you will see the needle exposed. Next, unscrew the back of the gun, which releases the spring and allows the needle to be fully removed. Note that the needle has a small rubber O-ring.

Goal: Disassemble the spray gun to access and replace the needle and O-rings.

Tools and materials

  • Crescent Wrench — Unscrewing the front and back housings of the gun
  • Graco Contractor II Spray Gun Graco — The main tool being disassembled

What they say

Hide

you clean that filter. Another thing you want to do with this gun, I about every 2 years I take the guns apart and clean them. If the guns are running fine, I don't ever want to take and clean take the actual gun itself apart and take the needle out cuz what's uh not broken. Don't attempt to fix it cuz they invariably will leak out the needle when you start messing with them. But eventually you'll start to get a little bit of paint start seeping out that needle and because the needle begins to wear out or get scars on it. And so to replace replace the gun housing or replace the needle, it's really important you start off you got to have a crescent wrench. And then you want to start off by squeezing this trigger. If you don't squeeze this trigger, if you're just taking it apart to clean it, you'll ruin that housing. When you put the new housing in, you could scar that the new seat by screwing this back on if you're not pulling the trigger. Very important. Pull the trigger. Hold the trigger down. Now I'm going to just attach a crescent wrench onto the front of the gun. right there. And then I release that. I'm still holding the trigger down tightly. Once I pull this off, now the needle is exposed. I can release the trigger. You can see the needle inside there. And that's the that little balls. That's what stops the paint from coming out of the gun. When you pull the trigger, it allows paint to go through. You release the trigger, it stops. And it's seating inside this thing. There's a little rubber O-ring on there. And that O-ring, when you're uh servicing this gun, it's a good idea to just put a new O-ring on there. So, now I got the needle exposed. There's the back of the gun. You're going to just release the back of the gun. This is where the spring is housed. And I'm going to release the back of this thing here. Unscrew it. And this is what gives you your tension on your trigger. um that gives the trigger the the tension to squeeze. It makes it hard to squeeze. So, you can release that and there's your spring. The spring comes out. Now, the needle is exposed on both sides.

Auto-generated from the video audio.