Problem
|
Cause
|
Solution
|
|
Sprayer will not run |
Power
switch not on |
Turn
switch on. |
| No power
at wall outlet |
Check
outlet by plugging in another
appliance. If appliance
does not work, try another
outlet. |
| Breaker
tripped |
Reset
breaker |
|
Pump won’t pump material
|
Mix too
thick |
Add
water to thin material.
Use Material
Thickness Gauge. |
| Selector
switch in wrong position |
Move
selector switch to correct
position
for application. |
| Loose
fittings |
Check
and retighten all fittings. |
| Pump hose
worn out |
Replace
hose. Recommended hose
replacement - once every
year. |
| Plugged
gun |
Relieve
Pressure, |
| Pump cold |
Move
pump to warm room and allow
it to warm up or run hot
water through sprayer |
| Air lock |
Open
air valve on gun. |
|
Material runs out of bottom
of sprayer |
Pump hose
worn out |
Replace
hose. |
| Loose
fittings |
Check
and retighten all fittings. |
|
No air from compressor |
Gun air
valve closed |
Open
gun air valve. |
| Low voltage |
Check
extension cord length and
gauge. Replace if different
than recommended. Refer
to Grounding and Electrical
Requirements |
| Gun needle
plugged |
Clean
needle and retry |
| Worn compressor |
Replace
compressor. Contact a qualified
Graco Service Center. |
| Damaged
hose |
Replace
hose. |
| Lines
not connected |
Check
all quick disconnect connections
to gun and hoses. |
|
Speed of application slow
or slower |
Material
too thick |
Thin
material. |
| Thin material.
Nozzle too small |
Change
nozzles to a larger size. |
| Pump hose
worn |
Replace
hose. |
| Plugged
or dirty gun |
Relieve
Pressure, Clean gun. |
| Gun adjustment
set too low |
Increase
flow adjustment with flow
adjustment nut. |
| Extension
cord too long or wrong gauge |
Use
a different extension cord.
Refer to Grounding and Electric
Requirements |
| Too much
air being used. |
Partially
close gun air valve to reduce
air flow. |
|
Intermittent flow/sputtering
|
Hopper
connection not tight |
Check
gasket. Tighten connection |
| Debris
in system |
Clean
system. |
|
Quick disconnect does not
stay connected. |
Dirty
or corroded fitting |
Clean
thoroughly. Soak in oil.
Apply a few drops of light
oil. |
| Tip is
partially clogged. |
Clear
Tip |
| Fluid
supply is low or empty. |
Refill
fluid supply. Prime pump.
Check fluid supply often
to prevent running pump
dry. |
|
Gun will not shut off |
Worn nozzle
or needle. |
Relieve
Pressure. Replace worn parts |
| Debris
in needle passage |
Relieve
Pressure, clean |
|
Pump output is low |
Intake
valve ball and piston ball
are not seating properly |
Remove
intake valve and clean.
Check balls and seats for
nicks; replace if necessary.
Strain paint before using
to remove particles that
could clog pump |
| Fluid
filter, tip filter, or tip
is clogged or dirty. |
Clean
filter |
| Prime
valve leaking |
Relieve
pressure. Repair prime valve. |
| Verify
pump does not continue to
stroke when gun trigger
is released. |
Service
pump |
| Leaking
around throat packing nut
which may indicate worn
or damaged packings. |
Replace
packings; see pump manual.
Also check piston valve
seat for hardened paint
or nicks and replace if
necessary. Tighten packing
nut/wet-cup. |
| Low stall
pressure |
Turn
pressure knob fully clockwise.
Make sure pressure control
knob is properly installed
to allow full clockwise
position. If problem persists,
replace pressure transducer. |
| Large
pressure drop in hose with
heavy materials |
Use
larger diameter hose and/or
reduce overall length of
hose. |
| Small
irregularities of new clutch
surfaces grind together
and cause noise |
Clutch
surfaces need to wear into
each other. Noise will dissipate
after a day of run time. |
| Pump stops
pumping |
Stalled
pump |
Shut
down system. Relieve pressure, |
| Pulsing
or surging material |
Triggering
too fast |
Slowly
squeeze trigger to fully
open position while moving
gun quickly in a circular
motion. |
|
Pattern too fine or too
much overspray |
Material
too thin |
Thicken
material. Material must
be mixed thoroughly to a
consistency that immediately
folds back in as you draw
your finger through the
surface of the material. |
| Air pressure
at gun too high |
Decrease
air to gun at gun fitting
and/or regulator. |
| Fluid
delivery too low |
Increase
nozzle size. Increase air
pressure to pump, or decrease
air to gun at gun fitting
and/or regulator Turn fluid
knob out on gun. |
|
Pattern too coarse |
Material
too thick |
Thin
material. Material must
be mixed thoroughly to a
consistency that immediately
folds back in as you draw
your finger through the
surface of the material. |
| Air pressure
at gun too low |
Increase
air to gun at gun fitting
and/or regulator. |
| Fluid
delivery too high |
Decrease
nozzle size. Decrease air
pressure to pump, or increase
air to gun at gun fitting
and/or regulator. Turn fluid
knob in on gun. |
|
Soft start won’t work/pump,
always loaded |
Sensor
is bad |
Change
sensor |
| Air leak
due to bad seal keeps valve
open |
Replace
seal |
| Normal
soft start system delay |
Release
trigger for 10-15 seconds.
Retry. |
| Switch
is not operating properly |
Replace
switch |
| Damaged
solenoid valve on cylinder |
Check
gun supply, hose and sprayer
for leaks |
| Air leak |
Check
gun supply, hose and sprayer
for leaks |
|
Needle adjustment won’t
adjust |
Dirty
threads |
Clean
threads |
| Nozzle
not on gun |
Put
nozzle on gun |
| Flow nut
set to maximum adjustment |
Turn
flow nut adjustment the
other
way |
