HP AUTOMATIC XT SPAY GUNS 311051D - Manual (Page 22)

Troubleshooting
22 311051D
Spray Pattern Troubleshooting
Problem Cause Solution
Fluid flow is fluttering while spraying. Fluid nozzle is not tight enough.
O-ring (36) is missing or damaged.
Fluid filter is clogged.
Tighten fluid nozzle to 60 in-lb (6.8
N•m).
Replace o-ring.
Check fluid filter.
Fluid flow fades while spraying high
viscosity fluids. Fluid pressure is too low, causing
fluid flow to reduce when gun is ele-
vated. Raise fluid pressure at source or use
a smaller fluid nozzle.
Pattern becomes off-set of heavy on
ends. Air cap horn holes plugged or dam-
aged. Clean air cap horn holes with
non-metallic item such as a toothpick,
or replace air cap.
Gun fluid pressure is too high with
gun triggered. Using needle/nozzle kit with too small
orifice. Use needle/nozzle kit with larger ori-
fice.
Fluid system will not operate at low
enough fluid pressure [below 10 psi
(70 kPa, 0.7 bar)]. There is no fluid regulator, or air reg-
ulator on pressure pot is not sensitive
enough at low pressures. Add low pressure fluid regulator, or
add more sensitive low pressure air
regulator on pressure pot.