Graco 16N664 Operation - Repair - Parts page 26

Problem
Sprayer makes sound but no
material is sprayed when trigger
is pulled
26
Cause
Sprayer is not primed.
Prime/spray valve is in UP position.
Flexible suction tube is missing or
improperly installed.
Flexible suction tube strainer or air
vent valve or vent holes are
clogged.
Flexible suction tube o-rings are
damaged or missing.
Flexible suction tube is damaged.
Spray tip is not in SPRAY position.
Spray tip is clogged.
Spray tip filter is clogged.
Pressure control knob is too low.
Sprayer has been tilted too far and
flexible suction tube has lost contact
with material.
No or low material in material cup.
Inlet valve fitting is stuck from
material residue left in sprayer.
Pump is clogged, frozen, or has
debris inside.
Material is leaking from hole in front
of sprayer.
Solution
Prime the pump. See Starting a New
Job (or Refilling the Material Cup),
page 11.
Use pump access armor stor
age/startup tool to clear pump of debris.
See Storage, page 17.
Clean air vent holes or the air vent
valve as your model is equipped. See
Shutdown and Cleaning, page 15.
Put prime/spray valve DOWN to spray
position.
Make sure Flexible Suction Tube is
properly installed, page 9.
See Shutdown and Cleaning, page
15.
Replace flexible suction tube o-rings.
Replace flexible suction tube.
Turn spray tip to SPRAY position.
See Unclogging Spray Tip/Guard
Assembly, page 14.
Remove and clean Spray tip filter. See
Unclogging Spray Tip/Guard Assem
bly, page 14.
Turn pressure control knob up.
Make sure material cup is filled with
material. Rotate flexible suction tube,
page 9. Do not tilt the material cup too
far. Prime the pump. See Starting a
new Job (or Refilling the Material
Cup), page 11.
Refill material cup with material and
prime the pump.
Use pump access armor stor
age/startup tool to clear pump of debris.
See Storage, page 17. If unsuccessful,
see Inlet Valve Fitting Removal/Ser
vice, page 22.
See Outlet Valve Fitting Repair, page
23 and Inlet Valve Fitting
Removal/Service, page 22.
Replace needle assembly.
Troubleshooting
3A2853C