Graco A Series Instructions-Parts List Manual page 8

ULTRATM
WO
BASIC COMPONENTS
Model 231-041 shown
PRESSURE CONTROL KNOB
ELECTRIC MOTOR
R U l D FlLT
DRIVE ASSEMBLY
FLUID
ounm
CIRCUIT BREAKER
RESET BU'ITON
PAILHANOER
DISPLACEMENTPUMP
PRESSURE RELIEFVALVE
MAIN FLUID HOSE
--SPRAY OUN
Your new UltraTM 500 Sprayer functions and operates
differently than other airless paint sprayers. This section
w i l l help you become familiar with the sprayer before
operating
it.
Pressure Control
The pressure control includes en ON/OFF switch for the
sprayer, the pressure adjusting control knob, a pressure
with a manual reset button. I t s function is to control the
sensing device, and e current overload circuit breaker
motor speed so that the sprayer maintains constant
fluid pressure at the pump outlet.
Motor
. . .
The DC motor has sealed bearings and replaceable
motor brushes. Its function is to drive the displacement
pump et the rate needed to supply sufficient paint
volume et the selected pressure.
Working together, the pressure control end motor
cause the pump to cycle whenever there is fluid or
pressure demand. When the pump is cycling, the motor
sounds like an automobile atarter cranking. When the
tently, or appears to have shut itself off. However, there
pump is not cycling, the motor hums, hums intermit-
w i l l still be Dower to the sDraver end it will
stay
pressurized and ready to use unless you manually shut
k
off and relieve pressure.
voltage or voltage fluctuations than an AC motor, end a
Because the motor is DC,
it
is
less
sensitive to low
heavy gauge extension cord of up to
150
feet
(46
m)
can be used.
The sealed drive assembly transfers power from the DC
Drive Assembly
motor to the displacement pump.
Displacement Pump
The positive displacement, volume-balanced pump pro-
vides equal fluid delivery on both the up and down
pump strokes. The pump has a wet-cup which, when
filled with Graco Throat Seal Liquid, helps prevent
damage to the throat peckings end piston rod.
fluid Filter
The fluid filter provides the final paint straining'to help
avoid clogs in the hose and spray tip. The filter includes
a reusable element and a pressure relief valve for reliev-
ing fluid pressure when shutting off the sprayer.
Hoses
The grounded, nylon spray hoses have spring guards on
The
3 foot (0.9 ml, 3116 in. ID whip hose allows flexi-
both ends. The 50 foot (15.2 m) hose has e 114 in. ID.
pulsation dampener to absorb pressure fluctuations.
ble gun movement. The nylon hose material acts es e
Spray Gun
B
Reverse-A-Clean 111 Spray Tlp
Graco high pressure sprey guns have
a
trigger safety
which prevents accidental triggering when it is engaged
(see below). The Reverse-A-Clean 111 spray tip
uses
high
without removing
it
from the gun. It includes a safety tip
pressure fluid to remove clogs from the spray tip
guard which helps reduce the risk of injection injury.