Working with a Graco spray gun but need some guidance? In this post, we’ll discuss key aspects of using the product such as unboxing it, how to disassemble it, and understanding what you need to know to fix a Graco spray gun if the mixing cartridge requires replacement.
With the Graco spray gun being such an ideal solution for polyurethane and polyurea applications, it’s key to understand best practices when using it. Watch our YouTube video below to follow along with our post!
Parts to Be Aware of When Fixing a Graco Spray Gun
At SprayWorks Equipment, we are here to help fix everyday problems for everyday applications. Before jumping into fixing a Graco spray gun, these are the essential parts of the Graco PC Fusion you need to be aware of:
- PC Fusion mixing chamber
- PC Fusion replacement cartridge
- Flush pot
Unboxing a Graco Spray Gun
The Graco PC Fusion is a gun that features a replaceable cartridge. When you first open the box, you’ll find a bag of spare parts, which includes the mixing chamber and three cartridges. The cartridge houses a port for the A and B sides and O-rings that are replaceable. There is no rebuilding process for O-rings, so if one goes bad you can easily replace it.
On the side of the box is the QR code, which will take you to our website’s Fusion PC page. This page features informative videos, the manual, and other helpful information.
When unpacking the gun, you’ll also see its safety card, which is included in all of Graco’s products, and the replacement card, which gives you a troubleshooting guide.
On the gun, you’ll find the hose block, which is interchangeable with the Fusion AP. It also has a blue locking ring for the air motor. Other key components you will need to be familiar with before learning how to fix a Graco spray gun include:
- The tool kit with all accessories
- Airline
- Flush pots
- Valves
- Air fittings
- Air cap
- Divider tool
- Grease tool
- Mixing chamber
- Drill bits
You will also need a tube of Graco’s Fusion grease, or a similar product, and a grease gun for some tasks.
Assembling the Mixing Chamber
When looking at the spray gun, you’ll notice it does not come with the mixing chamber assembled already, so you’ll have to assemble it yourself. Here are a couple of simple steps on how to do that:
- Take the air cap off and apply your grease on the inner parts.
- Find the mixing chamber and easily connect it to the body of the spray gun.
- Grab your PC cartridge and find the A and B ports and airport, which align with the hole at the top of the gun. Easily press that onto your gun.
- Screw your air cap on top of the gun.
Make sure everything is snug and held tightly together. Once you’ve finished those simple steps, you’ve successfully assembled your Graco spray gun.
Standard Maintenance for Your Graco Spray Gun
For standard maintenance for your Graco spray gun, we recommend using flush pots. These are items you’ll have to buy separately but they will be worth the investment to prevent future issues. The flush pot is made to be hooked to your block and facilitates cleaning for the spray system.
How to Disassemble Key Components to Fix a Graco Spray Gun
Your mixing chamber needs to be cleaned periodically to keep everything lubricated properly and so that you get maximum use out of the cartridge. This is in addition to using the flush pot.
If your mixing chamber isn’t performing well because it’s not cleaned, here’s what you need to do to fix a Graco spray gun so it can work properly:
- Unscrew the screen housing and clean the area with a standard gun cleaner.
- Unscrew the extraction tool at the bottom of the gun, which will be used to extract the cartridge.
- Unscrew the front cap by hand, using the extraction tool, or a wide flat screwdriver, to pry things apart. This gives you access to the mixing chamber so you can clean it or put a new one in. Keep the sides of the mixing chamber smooth and polished.
- Inspect the ports too to make sure there is no heavy buildup present.
- Replace the O-rings if needed.
- Use the divider tool to flush the sides out of the gun. This also helps with preventing cross-contamination.
- Use the grease tool and hook it up to the side ports of the grease gun. Squeeze the grease tool so grease can flow through.
- Once everything is greased properly, put the front cap and air cap back on and the gun should be ready to be used again.
We recommend that you flush out the gun every couple of days and check the parts to make sure there isn’t any kind of buildup.
Go Beyond How to Fix a Graco Spray Gun
Need further assistance? Feel free to contact us so we can help you with fixing a Graco spray gun and more. And be sure to ask our team for recommendations on spray foam equipment – we’ll be happy to assist.
