Filter
Top Products
2
307–758
TABLE OF CONTENTS
INTRODUCTION 2.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WARNINGS
English 4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
French 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spanish 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SETUP 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OPERATION 12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Startup 12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning
a Clogged T
ip 13.
. . . . . . . . . . . . . . . . . . . .
SHUTDOWN
AND CARE
14.
. . . . . . . . . . . . . . . . . . . . .
FLUSHING
GUIDELINES
15.
. . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING
GUIDE
Motor W
on’t Operate
16.
. . . . . . . . . . . . . . . . . . . . . .
Low
Output
19.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No
Output
20.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Excessive
Pressure Fluctuations
20.
. . . . . . . . . . .
Motor
Is Hot And Runs Intermittently
21.
. . . . . . . .
Electrical
Short
21.
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Spin Test 22.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bridge Test 23.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REPAIR
General
Repair Information
24.
. . . . . . . . . . . . . . . .
Motor
Brush
25.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power
Supply Cord
26.
. . . . . . . . . . . . . . . . . . . . . . .
On/Off
Switch
26.
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bridge
Rectifier
27.
. . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit
Breaker
27.
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit
Board
28.
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure
Control
29.
. . . . . . . . . . . . . . . . . . . . . . . . .
Pressure
Control Adjustment
30.
. . . . . . . . . . . . . . .
Drive
Housing, Conn Rod, Crankshaft
32.
. . . . . . .
Motor 34
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displacement
Pump
36.
. . . . . . . . . . . . . . . . . . . . . .
PARTS
DRA
WINGS & LISTS
Displacement Pump
39.
. . . . . . . . . . . . . . . . . . . . . .
Upright
Sprayer
40.
. . . . . . . . . . . . . . . . . . . . . . . . . .
Lo-Boy
Sprayer
42.
. . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure
Control
44.
. . . . . . . . . . . . . . . . . . . . . . . . .
Wiring
Diagram
45.
. . . . . . . . . . . . . . . . . . . . . . . . . . .
ACCESSORIES 46
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TECHNICAL
DA
TA 47.
. . . . . . . . . . . . . . . . . . . . . . . . . . .
DIMENSIONS 47
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GRACO
PHONE NUMBERS
47.
. . . . . . . . . . . . . . . . . .
THE
GRACO W
ARRANTY AND DISCLAIMERS
48.
.
INTRODUCTION
ULTRAr
500 BASIC COMPONENTS
Your
new sprayer functions and operates dif
ferently than
other
airless paint sprayers. This section will help you be
-
come
familiar with the sprayer before operating it.
Pressure Control
The
pressure control includes
an ON/OFF switch for the
sprayer
, the pressure adjusting control knob,
a
pressure
sensing device and a current overload circuit breaker
with
a manual reset button. The function of the pressure
control is to control the motor speed so that the sprayer
maintains constant fluid pressure at the pump outlet.
Motor
The
DC motor has sealed bearings and replaceable
mo
-
tor brushes. It drives the displacement pump at the rate
needed
to supply suf
ficient paint volume
at the selected
pressure. 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 un
-
til
the fluid pressure stabilizes, then the motor will shut
it
-
self off. However, there will still be power to the sprayer
and it will stay pressurized and ready to use until you
manually
shut it of
f and relieve pressure.
Because the motor is DC, it is less sensitive to low volt-
age or voltage fluctuations than an AC motor, and a
heavy gauge extension cord of up to 150 ft. (45 m) can
be
used.
Drive Assembly
The
sealed drive assembly
transfers power from the DC
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
packings and piston rod.
Fluid Filter
The
fluid filter strains the paint to help avoid clogs in
the
hose
and spray tip. The filter includes a reusable element
and
has a pressure drain valve for manually relieving fluid
pressure.
Hoses
The
grounded, nylon spray hoses have spring guards on
both
ends. The 50 ft. (15.2 m) hose has a 1/4 in. ID. The
3 ft.
(0.9 m), 3/16
in. ID hose provides more flexible gun
movement. The nylon hose material acts
as a pulsation
dampener to absorb pressure fluctuations.
Spray Gun & RAC IV DripLess Tip Guard
Graco high pressure spray guns have a safety latch
which
prevents accidental
triggering when it is engaged.
See the Detail in Fig 3–1. The gun provided with the
sprayer also has a filter for final paint straining. The
Reverse-A-Clean IV SwitchTip uses high pressure fluid
to remove clogs from the spray tip without removing it
from the gun. The Reverse-A-Clean IV DripLess tip
guard is a safety feature which helps reduce the risk of
fluid
injection injury
.