TABLE
OF
CONTENTS
...............................
Warnings 4
Introduction 2
Setup
....................................
6
Operation
.................................
8
Shutdown
&
Care
.........................
10
Troubleshooting Guide
.................................
Flushing Guidelines
.......................
11
Motor Won't Operate
....................
13
Low Output
............................
16
No
Output
.............................
17
Excessive Pressure Fluctuations
...........
17
Motor
Is
Hot and Runs Intermittently
........
18
Electrical Short
.........................
18
SpinTest
.............................
19
BridgeTest
............................
20
List of Tools
...........................
21
General Repair Notes
...................
21
Filter Replacement
......................
22
ON/OFF Switch Replacement
.............
23
Microswitch Replacement
................
23
Repair
Power Supply Cord Replacement
........
-
.
22
Bridge.Rectifier Replacement
..............
24
Choke Replacement
.....................
25
Varistor Replacement
....................
25
Circuit Board Replacement
................
26
Pressure Control Replacement
.............
27
Pressure Control Calibration
...............
28
Bearing Housing
&
Drive Housing
Replacement 32
Conn. Rod
Replacement, 30
Motor Brush Replacement
.................
33
Capacitor Replacement
...................
34
Motor Replacement
...................... 35
..............
...............
Parts Lists and Drawings
Complete Sprayer
.......................
38
Pressure Control Assembly
................
40
NOTE:
See manual 307
-
793, supplied, for the displace
-
ment pump repair instructions and parts list.
Technical Data 43
Accessories 42
.............................
Warranty Back Cover
Dimen.sions.. 43
..............................
.............................
.........................
INTRODUCTION
ULTRA@
433
BASIC COMPONENTS
Your new Ultra@ 433 Sprayer functions and operates dif
-
ferently than other airless paint sprayers. This section will
help you become familiar with the sprayer before operat
-
ing it.
Pressure Control
The pressure control includes an
ONlOFF switch for the
sprayer, the pressure adjusting control knob and a pres
-
sure sensing device. Its function is to control the motor
speed
so
that the sprayer maintains constant fluid pres
-
sure at the pump outlet.
Motor
tor brushes. Its function is to drive the displacement
The DC motor has sealed bearings and replaceable
mo-
pump at the rate needed to supply sufficient 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 cy
-
cling, the motor sounds like an automobile starter crank
-
ing. When the pump
is
not cycling, the motor may hum
intermittently until the fluid pressure stabilizes, then the
to the sprayer and it will stay pressurized and ready to
motor will shut itself
off.
However, there will stili be power
use
unless you manually shut it off and relieve pressure.
Because the motor is DC, it
is
less sensitive to low volt
-
age or voltage fluctuations than an AC motor, and an ex
-
tension cord of up to 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.
2
307-670
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 a pressure drain valve for relieving fluid pressure.
Hoses
The grounded, nylon spray hoses have spring guards on
both ends.
The152 m hose has a 1/4 in.
ID.
The
0.9
m,
3/16 in.
ID
whip hose allows flexible gun movement. The
nylon hose material acts as a pulsation dampener to ab
-
sorb pressure fluctuations.
Spray Gun
&
RAC
IV
DripLess Tip Guard
which prevents accidental triggering when it
is
engaged.
Graco high pressure spray guns have a trigger safety
See
Fig Z-I.
The gun provided with the sprayer also has
a
filter for final paint straining. The ReverseA-Clean IV
the spray tip without removing
it
from the gun. The Re
-
SwitchTip uses high pressure fluid to remove clogs from
which helps reduce the risk of fluid injection injury.
verse
-
A
-
Clean IV DripLess tip guard is a safety feature