Graco Spray Gun 26B520

Warning: Always ground equipment and waste container to avoid fire and explosion.

Flush at the lowest pressure possible. Check connectors for leaks and tighten as necessary.

Flush with a fluid that is compatible with the fluid being dispensed and the equipment wetted parts.

Followed the Pressure Relief Procedure

Upload a photo of the removed retaining ring (8b), air cap (8a), and spray tip (7)

Notice: Methylene chloride with formic or propionic acid will damage aluminum and nylon components. Do not use to flush or clean the gun.

Gun pointed down into a grounded metal container?

Warning: Ensure the machine is turned off and unplugged before starting the procedure

Unscrew the fluid inlet fitting (15)

Remove the inline fluid filter (14) from the fluid tube assembly (13)

Clean or replace the inline fluid filter

Install the fluid inlet fitting (15). Torque to 175–185 in-lb (20–21 N•m)

Sign off on the Inline Fluid Filter Cleaning

Follow the Pressure Relief Procedure, page 15.

Remove the air cap assembly (8) and spray tip (7)

Flush the gun with a compatible solvent. See Flushing Procedure, page 21.

Soak the spray tip (7) in a compatible solvent.

Dip the end of a soft-bristle brush into a compatible solvent.

Do not use metal tools to clean the air cap assembly parts. Metal tools may scratch the air cap and cause spray pattern distortion.

Clean the air cap assembly (8) and spray tip (7) with a soft-bristle brush.

Use a soft tool, such as an unclogging needle or toothpick, to clean the air cap (8a) holes.

Blow air through the spray tip (7) to clear the orifice.

Step 1: Inspect Ventilation System

Ensure that the spray booth ventilation system is functioning properly.

Confirm that the ventilating air flow is above the minimum required value.

Step 2: Test the Interlock Function

Simulate or induce a condition where the air flow drops below the minimum level.

Verify that the gun fluid supply automatically shuts off and the gun cannot be operated.

This confirms that the interlock is correctly preventing gun operation during insufficient ventilation.

Step 3: Perform Annual Verification

Conduct this interlock test at least once per year.

Reverse-A-Clean (RAC) Tip Maintenance

To avoid serious injury from skin injection, do not put your hand in front of the spray tip when removing, installing, or maintaining the air cap assembly.

NOTE: Do not soak the RAC tip seat gasket (33a) in solvent for extended periods of time or swelling may occur.

1. Release the trigger, and engage the trigger lock (3).

2. Rotate the SwitchTip and tighten the retaining ring.

3. Disengage the trigger lock (3).

4. Trigger the gun into a pail to clear the clog.