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Final Lubrication, Inspection, and Testing

10:30
11:06
65.2K views

At 10:30 in

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

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What happens here

After full reassembly, check the trigger pull to ensure it operates smoothly. Then, spray more WD-40 on the ends of the gun and down into the filter side to lubricate all parts. This lubrication helps prevent any leftover paint from drying and hardening, keeping the gun functioning properly. Finally, test the gun with water to ensure there are no leaks. If leaks occur from the end of the gun, it indicates the needle or seat is scored or has a nick, and the packing kit will need to be replaced. Packing kits typically cost between $50 and $60.

Goal: Ensure the gun is fully lubricated, operates correctly, and is free of leaks.

Tools and materials

  • Graco Contractor II Gun Graco — The fully reassembled and cleaned paint gun
  • Water Tap water — Testing the gun for leaks
  • WD-40 WD-40 — Final lubrication of the gun

What they say

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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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