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Relieve pressure when not using the unit, to avoid the
pump stalling out a t the top of the stroke when starting
up. If the pump stalls: relieve pressure, according to
Pressure Relief Procedure, below, remove plug from the
top of the hydraulic motor (see illustration below) and
push the spool all the way down. Replace the cap and
start up again.
A
h
APLUG
Periodically, or if electric motor is overheating, unplug
unit, relieve pressure, remove shield and clean
all
paint,
dirt, dust, etc., off the shield, fan blades, motor and
cooling fins.
Normal seepage of hydraulic fluid past hydraulic motor
piston rod wiper will gradually fill wet-cup. Check wet-
cup after every eight hours of operation to prevent
overflow.
Always wrap the hose around the hose brackets when
from damage.
storing unit, even if only overnight, to help protect hose
SERVICE
TROUBLESHOOTING CHART
WHAT'SWRONG
to do before disassembling any part of your unit.
Check everything in the troubleshooting chart for what
WARNING
Always relieve system pressure whenever you are
Pressure
Relief Procedure
done spraying for
a
while and before installing,
removing or cleaning any parts to avoid possible
injury from high pressure fluid in thesystem.
Electricmatorstopswhilespraying
Electric motor won't run
Always follow this procedure: shut off the pump,
Electric motor runs but paint
trigger the spray gun, engage the trigger safety,
pumpwon'twork
and slowly open the drain valve. Leave the drain
Paintpumprunsbutoutputlowon
valve open until you are ready t o use the
unit
upstroke
down Stroke
both strokes
motor piston rod wiper
Paintleaksintowet-cup
Excessivesurge atspray gun
Not enough paint breakup
Excessive leakagearound hydraulic
WHY
WHATTO DO
HydraUlicmotorstalled
seeabove paragraph
Unitunpluggedor building
Paint coating
too
thick
circuit fuse blown
Tailsorfingersinspraypattern Defectiveswitch
or
electric
motor
check. replace
replace
Static sparking from spray gun Pressuresetting
too low
unplug unit.
increase
Outlet filter dirty
or
plugged
Tip plugged
clean
Hydraulic fluid low
reverse
to
clear or clean
Hydraulic
pump
wornordamaged
check, add fluid"
Hydraulic motor warn or damaged
check
Displacementrodseized
servicelsee306-980)
Worn or damaged piston
by dried paint
service
rad or Seal
Piston
ball
check not seating
replace lsee306-9801
Piston packingsworn
or
damaged
service
Intake valve ball check
not
seating
replace
Throatpackingswornordamaged
service
Spray tip
too
big orworn
replace
Paint
supply
low or pail empty
changetiplsee307-3211
fill
Unit
or
work not grounded
Large pressure drop in hose
check,ground
Drainvalveopen
use larger hose
close
'The electric motor has overheating protector switch which will
automatically reset
on
cooling. If itopens, unplug unitand
let
it
mol
for2to20minutes.Alsotlytocorr~tthecauseofoverheating.
Spitting from spray gun
Overheatingswitch hasopened
Gunwillnotspray
"When
adding hydraulic fluid to sump,
use
only G!aco approved
fluid.SeeACCESSORlESonpage11forapprovedfluld.
307-337
5
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