Graco Silver Plus Spraygun Rebuild

Introduction

This tutorial will guide you through the process of rebuilding a Graco Silver Plus spray gun. Whether you are maintaining your existing equipment or restoring a used spray gun, this step-by-step guide will help you replace essential components effectively. This rebuild is relevant for both the Graco Silver Plus and its variants, including the Flex and Flex Plus models.

Step 1: Secure the Spray Gun

• Place the spray gun in a vice to keep it stable during the repair process. Ensure that it is securely fastened to avoid any movement while you work.

Step 2: Remove the Diffuser

• Use a 5/8 wrench to unscrew and remove the diffuser from the spray gun. This step is crucial as it allows access to internal components.

Step 3: Remove the Trigger

• To remove the trigger, you can use two vice grips or two wrenches for a better grip. This step may require some force, so be prepared.

Step 4: Disconnect the Needle Assembly

• Locate the set screw beneath where the hose attaches. Use an Allen wrench to loosen this screw, which will allow you to remove the needle assembly.
• Once loosened, you may need to tap out the needle assembly gently using a small hammer.

Step 5: Reassemble the Gun

• After removing the needle assembly, reinsert the section back into the gun. Align it properly and tighten the set screw with the Allen wrench to secure it.

Step 6: Install the New Needle Assembly

• Take the new needle assembly from your repair kit. Apply a small amount of grease around the seals to ensure a proper fit and seal.
• Use the positioning tool that comes with the kit to guide the needle into place. Slide it over the needle and gently tap it into position with a light hammer.

Step 7: Replace the Diffuser

• Before installing the new diffuser, replace the copper crush washer to ensure a tight seal. Then, screw the new diffuser into place, ensuring it’s securely tightened.

Step 8: Reattach the Trigger

• Finally, replace the trigger on the spray gun. Make sure it moves freely and is properly secured.

Conclusion

You have now successfully rebuilt your Graco Silver Plus spray gun. This repair requires no additional adjustments or filters, making it a straightforward maintenance task. For future reference, the repair kit part number is 235 474. Regular maintenance like this can extend the life of your spray gun and ensure optimal performance.