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HERO Operator’s Manual – Page 15 of 23
4.3 COMPLETE DISASSEMBLY AND CLEANING OF SPRAY GUN
Periodically, especially after spraying an adhesive, a catalyzed coating, or any other material that is
known to be difficult to clean, HERO recommends that you completely disassemble your gun and clean
each part individually. If necessary, contact your local HERO distributor or HERO directly for a parts
breakdown of your gun, or for any help when completely disassembling and re-assembling your gun.
Tools required: ratchet, 1/2” and 5/8” sockets, 5/8” and 7/16” combination wrenches, and a Gun
Cleaning Brush
To Clean And Disassemble The Gun:
For Pressure-Fed Guns without a paint cup, flush the gun with cleaning solvent and go directly to Step 7:
1. Remove the paint cup from the gun. While removing the cup, squeeze the trigger on the gun to
release all the paint from the siphon tube back into the cup.
2. Empty the excess material from the paint cup and clean the paint cup with an appropriate cleaning
solvent.
3. Pour some cleaning solvent in the clean paint cup and spray it with the gun into a bucket until the
spray is clear. Remove the paint cup from the gun.
4. Using the closed end of a 5/8” combination wrench, remove the Siphon Tube Locking Nut
located under the Paint Cup Top.
5. Remove the Splash Guard (square piece of aluminum with two holes in it and a cut corner).
6. Using a 5/8” socket and a ratchet, remove the Siphon Tube Extension – this will allow you to
completely remove the Paint Cup Top Assembly.
7. Completely unscrew the Material Flow Adjustment Screw at the back of the gun and remove the
Spring and Needle – if necessary, squeeze the trigger to help remove the Needle.
8. Using the opened end of a 7/16” combination wrench, remove the Gland Nut located directly in
front of the trigger, and remove the Gland Seal.
9. Completely unscrew the Sleeve Nut on the barrel of the gun and remove the Air Cap, Air
Distributor, and Air Distributor Spring (Air Cap only on models without Floating Air Cap).
10. Using a 1/2” socket and a ratchet, remove the Fluid Tip.
To Clean Parts Individually And Replace Gaskets:
1. Soak all dirty parts in clean cleaning solvent (Fluid Tip, tip of Needle, Siphon Tube Extension,
Splash Guard, etc.). If necessary, soak the entire Gun Body.
2. Using the Gun Cleaning Brush, clean the inside of the Siphon Tube, Siphon Tube Extension, and
all Fluid Passages.
3. Remove the Cup Top Gasket. Using the Gun Cleaning Brush, a paintbrush (if necessary), and
cleaning solvent, clean the underside of the Paint Cup Top, and install a new Cup Top Gasket.
4. When re-assembling the Paint Cup Top Assembly, be sure that the Air Pressure Feed Tube
protruding from the Gun Body is not blocked, and install a new Cup Top Washer between the
Cup Top and the Gun Body.
5. Before re-installing the Gland Nut, install a new Gland Seal to seal the fluid passage – ensure that
the Gland Seal is seated properly before installing the Gland Nut. If not properly installed, this
may cause leaking between the Gland Nut and the Needle directly in front of the gun trigger.
Do not use hardened needles or picks to clean the holes of the Fluid Tip or the Air Cap. This may