HP GRACO OR PRO TI1681A - Manual (Page 38)

Troubleshooting
38 309293J
Gun Operation Troubleshooting
Problem Cause Solution
Excessive spray fog. Atomizing air pressure too high. Close restrictor valve some, or
decrease air pressure as low as pos-
sible; minimum 40 psi (0.28 MPa, 2.8
bar) needed at gun for full voltage.
Fluid too thin. Increase viscosity.
“Orange Peel” finish. Atomizing air pressure too low. Open atomizing air valve more or
increase gun air inlet pressure; use
lowest air pressure necessary.
Poorly mixed or filtered fluid. Remix or refilter fluid.
Fluid too thick. Reduce viscosity.
Fluid leaks from the fluid packing
area Worn packings or rod. Replace packings or rod; see page
45.
Air leaks from the front of the gun Air valve (21) is not seating properly. Clean and service air valve; see
page 50.
Fluid leakage from the front of the
gun Worn or damaged packing rod (26). Replace; see page 45
Worn fluid seat. Replace fluid nozzle and/or electrode
needle; see pages 42 to 43.
Loose fluid nozzle (7). Tighten; see page 42.
Damaged nozzle o-ring (7b). Replace; see page 42.
Gun does not spray Low fluid supply. Add fluid if necessary.
Damaged air cap (9). Replace; see page 42.
Dirty or clogged fluid nozzle (7). Clean; see page 42.
Damaged fluid nozzle (7). Replace; see page 42.
Damaged fluid adjustment valve (25). Replace; see page 50.
Dirty air cap Misaligned air cap (9) and fluid noz-
zle (7). Clean fluid buildup off air cap and
fluid nozzle seat; see page 29.