Graco GM3500 SPRAYER 231-078 Instructions And Parts List page 2

TABLE OF CONTENTS
Introduction
...............................
2
Warnings
Fueling
...................................
7
Startup
...................................
8
Maintenance
. . . . . . . . . . . . . . . . . . . . . . . I . . . . .
10
Flushing Guidelines
.......................
11
Troubleshooting Guide
....................
13
Repair
Pressure Control
.......................
15
Pressure Control Calibration
. . . . . . . . . . . . . .
17
Bearing Housing and Connecting Rod
. . . . . . .
18
Drive Housing
..........................
20
Pinion, Clutch, Field, Clamp, Engine
Pinion Housing Removal
. . . . . . . . . . . . . .
21
Setup
....................................
6
Repairing the Pinion
. . . . . . . . . . . . . . . . . . 22
Clutch
.............................
24
Engine
.............................
25
Field and Wiring Harness
. . . . . . . . . . . . . .
26
Clamp
.............................
27
Clutch Housing
......................
27
Reassembly
........................
28
Complete Sprayer, 231-078
. . . . . . . . . . . . . . .
30
Pinion Assembly
........................
33
Pressure Control Assembly
. . . . . . . . . . . . . . . .
34
Accessories
..............................
35
Dlmensions
...............................
35
TechnicalData
............................
35
Warranty
.........................
Back Cover
Parts Lists and Drawings
. .
INTRODUCTION
GM3500
BASIC
COMPONENTS
(Refer to Fig 3-1)
The GM3500 Sprayer functions and operates differently
than other airless paint sprayers. Read this section to
help you become familiar with the sprayer beforeoperat-
ing it.
Pressure Control
The pressure control includes an ONlOFF switch for the
sprayer, the pressure adjusting knob, and a pressure
sensing device. The pressure control engages and dis-
engages the clutch to control pressure.
Engine
The engine is a 3.5 horsepower, four stroke gasoline en-
supply paint. An adjustable throttle allows you to adjust
gine. Its function is to drive the displacement pump to
engine speed for large or small orifice spray tips. When
the oil level is too low, the engine shuts off automatically.
illuminates to alert you to the problem and protect the en-
If you try to start the engine without refilling the oil, a light
gine from damage.
Clutch
The clutch is engaged by the electric power generated by
the gasoline engine.The power is controlled by the pres-
sure switch.
Drive Assembly
The permanently-greased drive assembly transfers
power from the gas engine 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 a pressure drain valve for relieving fluid pressure.
Hoses
The grounded, nylon spray hoses have spring guards on
bothends.The50foot(15.2m)hosehasa1/4,in.ID.The
3 foot (0.9 m), 3/16 in. ID whip hose allows 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 trigger safety
which prevents accidental triggering when the safety is
engaged. See Fig
2-1.
The Contractor gun provided
with this sprayer also has a filter for final paint straining.
The Graco SwitchTipTU uses high pressure fluid to re-
gun. The Revers+A-Clean@ IV DripLessTM tip guard
is a
move clogs from the spray tip without removing it from the
safety feature which reduces the risk of fluid injection.
Trigger safety
shown engaged
Fig
2-1
2 307-893