Troubleshooting - Graco Delta Spray 308741N Instructions Manual

WARNING
PRESSURIZED EQUIPMENT HAZARD
To reduce the risk of a serious injury, follow the Pres-
sure Relief Procedure on page 12 before checking
or repairing any part of the gun or system.
PROBLEM
Fluid flow is fluttering while spraying
Fluid flow fades while spraying high
viscosity fluids
Pattern becomes off-set or heavy on
ends
Gun fluid pressure is too high with
gun triggered
Using a low fluid pressure setting,
the fluid flow is too high, making it
necessary to restrict needle travel to
reduce fluid flow
Fluid system will not operate at low
enough fluid pressure [below 10 psi
(70 kPa, 0.7 bar)]

Troubleshooting

CAUSE
1. Fluid nozzle not tight enough
2. Fluid filter clogged
4. Fluid adjustment knob not prop-
erly set
1. Air hose size is too restricted for
higher air flow being used
2. Fluid pressure too low, causing
fluid flow to reduce when gun is
elevated
Air cap horn holes plugged or dam-
aged
Using needle/nozzle kit with too
small orifice
Using needle/nozzle kit with too
large orifice
There is no fluid regulator, or air
regulator on pressure pot is not sen-
sitive enough at low pressures
SOLUTION
1. Tighten fluid nozzle to 125–135
in-lb (14–15 NSm).
3. Check fluid filter.
5. Turn the fluid adjustment knob
out for less feathering or use a
larger size nozzle.
1. Use 5/16 in. (7.9 mm) I.D. air
hose if the hose is 25 ft.
(7.625 m) long. If longer hose is
needed, use a 3/8 in. (9.5 mm)
I.D. hose.
3. Raise fluid pressure at source or
use a smaller fluid nozzle.
Clean air cap horn holes with non-
metallic item such as a toothpick, or
replace air cap.
Use needle/nozzle kit with larger
orifice
Use needle/nozzle kit with smaller
orifice
Add low pressure fluid regulator, or
add more sensitive low pressure air
regulator on pressure pot.
308741 17