Troubleshooting; General Troubleshooting - Graco AUTOMATIC XT SPAY GUNS 311051D Instructions - Parts Manual

Troubleshooting

Troubleshooting
Check all possible remedies in the troubleshooting
charts before disassembling the gun.
Some improper patterns are caused by the
improper balance between air and fluid. Refer to
Spray Pattern Troubleshooting, page 22.

General Troubleshooting

Problem
Fluid leakage through venting holes.
Air leakage through venting hole.
Air leakage from back of gun.
Air does not trigger.
Air does not shut off.
Fluid leakage from front of gun.
Fluid is present at air cap holes.
20
Cause
Worn packing (17) or needle (5).
Worn o-ring (9) or gasket (15).
Worn o-rings (8, 9).
Piston stem is disconnected from
main body of piston assembly (3).
Cylinder air pressure is too low.
Piston assembly not seating properly.
Broken return spring (7).
Swollen o-ring (8).
Worn piston stem o-rings (10, 11).
Bottom gasket (12) failed.
Fluid needle tip (5a) is dirty, worn, or
damaged.
Dirty or worn nozzle (23).
Nozzle (23) is insufficiently tightened
or sealing o-ring (36) is damaged.
Solution
Replace packing or needle.
Check and replace parts as needed.
Replace o-rings.
Replace piston assembly.
Increase cylinder air pressure to 50
psi.
Clean/service piston assembly.
Replace worn or swollen o-rings.
Replace return spring.
Replace o-rings.
Replace o-rings.
Replace gasket.
Clean or replace fluid needle tip or
entire needle (5).
Clean or replace nozzle.
Tighten or replace o-ring.
311051D