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Your new Ultra
"
400
Sprayer functions and operates
differently than other airless paint sprayers. This section
will
help
you
become familiar with the sprayer before
operating
it.
Pressure Control
The pressure control includes an
ONlOFF
switch for the
sprayer, the pressure adjusting control knob, and
a
pressure sensing device.
Its
function is to control the
motor speed
so
that the sprayer maintains constant
fluid pressure
at
the pump outlet.
The DC motor has sealed bearings and replaceable
Motor
motor brushes.
Its
function
is
to drive the displacement
volume
at
the selected pressure.
pump
at
the rate needed to supply sufficient .paint
Working together, the pressure control and motor
cause
the pump to cycle whenever there is fluid or
pressure demand. When the pump is cycling, the motor
sounds like an automobile starter cranking. When the
pump is not cycling, the motor
may hum intermittently
shut itself off. However, there will
still
be power to the
until the fluid pressure stabilizes, then the motor will
sprayer and
it
will stay pressurized and ready to use
unless you manually shut
it
off
and relieve pressure.
Because the motor
is
DC,
it
is less sensitive to low
voltage or voltage fluctuations than an AC motor, and
an extension cord of up to
45
m
(150
feet) can be used.
The sealed drive assembly transfers power from the
DC
Drive Assembly
motor to the displacement pump.
4
307-671
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 packings and 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
drain valve for relieving fluid
pressure when shutting
off
the sprayer.
Two grounded, nylon spray hoses with spring guards
Hoses
are included with the sprayer. The
15.2
m (50foot) hose
hose allows flexible gun movement. The nylon hose
has
a
114
in. ID. The
0.9
m
(3
foot),
3/16
in. ID whip
material acts
as a
pulsation dampener to absorb
pressure fluctuations.
Spray Gun
&
Reverse-A-CleanTM IV DripLessTM Tip
The spray gun includes
a
trigger safety latch which
Guard
prevents accidental triggering when
it
is engaged (see
the WARNING on page
2)
and
a
trigger guard which
prevents accidental triggering if the gun is dropped. The
Reverse
-
A
-
Clean
IV
SwitchTipTM uses high pressure
fluid to remove clogs from the spray tip without remov
-
ing
it
from the gun.
It
includes
a
safety tip guard which
helps reduce the risk of fluid injection injury.