Graco RTX-650 Repair Manual page 15

Troubleshooting
Problem
Speed of application too slow
Intermittent flow/sputtering
Gun will not shut off
Fluid leaking at Flow Adjustment Nut
on gun
Fluid leaking out of either plug on gun Missing or damaged o-rings
Needle adjustment on gun won't
adjust
311771D
Cause
New pump hose not broken in
properly
Material too thick
Nozzle too small
Plugged or dirty gun
Kinked hose
Gun fluid flow adjustment set too low Increase flow adjustment with flow
Hopper connection not tight
Debris in system
Worn nozzle or needle.
Debris in needle passage
Damaged seal.
Gun damaged
Dirty threads
Nozzle not on gun
Solution
Run pump dry for no longer than 2
minutes.
Thin material.
Change nozzles to a larger size. See
Operation Manual, Recommended
Nozzle Selection Chart, page 10.
Relieve Pressure, page 6. Clean
gun.
Unkink hose.
adjustment nut.
Check gasket. TIghten connection.
Clean system.
Relieve Pressure, page 6. Replace
worn parts.
Relieve Pressure, page 6. Clean.
Relieve Pressure, page 6. Replace
seal.
Relieve Pressure, page 6. Replace
o-rings.
Replace gun.
Clean threads.
Put nozzle on gun.
15