Repair; Service Screen Screw; Remove Check Valve - Graco GX-8 Operation, Parts, Service, Repair
For use with non-flammable polyurethane foams, two-component coating systems
(polyureas), and some two-component epoxy systems. for professional use only.
not for use in explosive atmospheres.
3500 psi (24 mpa, 240 bar) maximum working pressure
125 psi (9
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Also See for GX-8:
- Operation, parts, service, repair (40 pages) ,
- Instructions-parts list manual (6 pages)
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Repair
Repair
Shutdown proportioner and allow chemicals to cool
before servicing gun.
Service Screen Screw
To avoid static sparking that may result in fire or explo-
sion, ensure all equipment in flushing procedure is
grounded. Do not flush on or near foamed or coated
surfaces.
1. Flush gun see Clean Spray Gun Procedure, page
19.
2. Unthread screen screw from gun block.
3. Remove screen screw retainer before removing
screen.
4. Remove screen from screen screw. Soak in gun
cleaner or replace if clogged or dirty.
5. Clean screen screw cavity. If any particles are visi-
ble, clean with clean out drills and flush with gun
cleaner.
NOTE: Any material left in cavity on downstream side of
screen will clog mixing module.
6. Inspect screen screw seal for damage. Replace if
necessary.
7. Reinstall screen screw in gun block. Ensure it is
tight.
8. Flush gun with mixing module removed.
20
Remove Check Valve
To avoid static sparking that may result in fire or explo-
sion, ensure all equipment in flushing procedure is
grounded. Do not flush on or near foamed or coated
surfaces.
Check valves are located in cavities of gun block under
each coupling block gasket. Check valves are triangular
pieces with a spring inserted in one end. The isocyanate
valve is notched for easy identification.
To remove check valve:
1. Clean gun (see Clean Spray Gun Procedure, page
19).
2. Use check valve seal removal/cleaning tool to
remove gaskets from recesses in coupling block.
Inspect gaskets for damage and replace if neces-
sary.
3. Remove check valves. If valve does not come out
easily, insert machined end of removal/cleaning tool
over valve and rotate it while extracting valve.
4. Clean valves and springs with gun cleaner. Inspect
for damage and replace if necessary.
5. Inspect each check valve cavity. Use cleaning tool
to remove any visible particles. Use gun cleaner to
flush thoroughly.
6. Insert each check valve into its cavity spring end
first. Ensure check valve is oriented correctly. Isocy-
anate valve is notched for easy identification.
7. Install coupling block gaskets.
311338N
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