Graco GM3500 SPRAYER 231-078 Instructions And Parts List
INSTRUCTIONS-PARTS LIST
This
manual contalns IMPORTANT
WARNINGS AND INSTRUCTIONS
READ AND RETAIN
FOR
REFERENCE
GM3500
SPRAYER
3000
psi
(2
10
bar)
MAXIMUM WORKING
PRESSURE
Model
231-078
Complete Sprayer,
with Stainless Steel Displacement
Pump
307-893
ORACO
Rev.
A
1
GRACO INC.
P.O.
BOX
1441 MINNEAPOLIS. MN 55440-1444
COPYRIGHT
1988,
GRACO INC.
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 beforeoperating 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 disengages 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 provides 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
Fig
3-1
307-893
3
SAFETY
WARNINGS
HIGH PRESSURE SPRAY CAN CAUSE SERIOUS INJURY.
FOR
PROFESSIONAL USE ONLY. OBSERVE ALL WARNINGS
Read and understand
all
instruction manuals before operating equipment.
FLUID.lNJECTlON HAZARD
General Safety
This equipment generates very high fluid pressure. Spray 6om
the gun, leaks or ruptured components can inject fluid through
yourskin and into your body and causeextremely serious bodily
injury, including the need for amputation. Also, fluid injected or
age.
splashed into the eyes or on the skin can cause serious dam-
NEVER put hand or fingers over the spray tip. NEVER try to
NEVER point the spray gun at anyone or at any part of the body.
"blow back paint; this is NOT an air spray system.
ALWAYS have the tip guard in place on the spray gun when
ALWAYS follow the
Pressure Relief Procedure.
below.before
spraying.
cleaning or removing the spray tip or servicing any system
equipment.
NEVER
try
to
stop or deflect leaks with your hand or body.
Be
sure equipment safety devices are operating properly before
each use.
Medical Alert-Airless Sarav
Wounds
~~ ~~~
MEDICAL
CARE AT 8NCE. DO NOT TREAT AS A SIMPLE
If
any fluid appears to enetrate
your skin,
getEMERGENCY
-r~-,
~~
CUT.
Tell the doctor exactly what fluid was injected.
Note
to
Physician: Injection in the skin is atraumaticinjury.
It
isimportanttotreattheinjurysurgicallyassoonaspossible.
Do
not delay treatment
to
research toxicity. Toxicity is a con-
cern with some exotic coatings injected directly into the
constructive hand surgeon may be
advisable.
blood stream. Consultation with a plastic surgeon or re-
Spray Gun Safety Devices
Be
sure all gun safety devices are operating properly before
cause a malfunction and result in serious bodily injury.
each use.
Do
not
remove or modify any part
of
the gun; this can
Safety Latch
Wheneveryoustopspraying,evenforamoment,alwayssetthe
gun safety latch in the closed or "safe" position. making the gun
tal triggering of the
gun.
inoperative. Failure
to set the safety latch can result in acciden-
Diffuser
The gun diffuser breaks up spray and reduces the risk of fluid
injection when the tip
is
not installed. Check diffuser operation
regularly. Follow the
Pressure Relief Procedure.
below, then
gunfirmlytothe pail. Using the lowest
possiblepressure,trigger
remove the spray tip. Aim the gun into a metal pail, holding the
the gun.
If
the fluid emitted
is
not diffused into an irregular
stream, replace the diffuser immediately.
Tip Guard
ALWAYS have the tip guard in place
on
the spray gun while
spraying. The tip guard alerts you
to
the fluid injection hazard
and helps reduce, but does
not
prevent,
the
risk of accidentally
placing your fingers
or
any part of your body close
to
the spray
tip.
Trigger Guard
Always have the trigger guard in place
on
the gun when spray.
ing
to
reduce the risk of accidentally triggering the gun
if
it is
dropped or bumped.
Spray Tip Safety
the spray tip clogs while spraying, engage thegun safety fkch
Use extreme caution when cleaning or changing spray
ti
s
If
and then remove the spray tip to clean
it.
immediately. ALWAYS follow the
Pressure Relief Procedure
fully relieved and the gun safety latch is engaged.
NEVER wipe
off
build-up around the spray tip until pressure is
To reduce the risk of serious bodily injury, including fluidinjec-
Pressure Relief Procedure
tion, splashing fluid or solvent in the
e
es
oron the skin, or injury from moving parts or electric shod, always follow this procedure whenever you shut
ofl
the sprayer,
when
checking or
servicing any part
of
the spray system, when installing. clean-
ing or changing spray tips, and whenever you stop spraying.
2.
Turn the engine ON/OFF switch to OFF.
1.
Engage the gun safety latch.
3.
Flip the pressure control switch to OFF.
4.
Disengage the gun safety latch. Hold a metal part of the
the gun to relieve pressure.
gunfirmlytothesideofagroundedmetalpai1,andtrigger
5.
Engage the gun safety latch.
6.
Open the pressure drain valve, having a container ready
to catch the drainage. Leave the valve open until you are
ready to spray again.
7.
Disconnect the spark plug cable
lfyoo suspect that the spray tip orhose is corn lefel clogged,
or thatpressure has not been
fully
relieveda~er fo~o~i"~ the
steps above. VERY SLOWLY loosen the tip guard
retaining
nut or hose end coupling and relieve pressure gradually, then
loosen
completely. Now clear the tip or hose.
1
2
4
307-893
MOVING PARTS HAZARD
Moving parts can pinch or amputate your fingers or other body
the sprayer. Follow the Pressure Relief Procedure on page
4
parts. KEEP CLEAR of moving parts when starting or operating
beforechecking orservicing any partofthesprayer. toprevent it
from starting accidentally.
EQUIPMENT MISUSE HAZARD
General
Safety
Any misuse of the spray equipment or accessories, such as
overpressurizing. modifying parts, using incompatible chemi-
cals and fluids, or using worn or damaged parts, can cause
them to ruoture and result in fluid iniection. solashino in the eves
or on the skin, or other serious bodily inju&,'orfire. Explosioi or
property damage.
NEVER alter or modify any part of this equipment: doing
so
could cause
it
to malfunction.
CHECK all spray equipment regularly and repair or replace
worn or damaged parts immediately.
Always wear protective eyewear, gloves, clothing and respira-
tor as recommended by the fluid and solvent manufacturer.
System
Pressure
This sprayer can develop 3000 psi
(210
bar) MAXIMUM
WORKING PRESSURE. Be sure that all spray equipment and
accessories used are rated to withstand this pressure.
DO
NOT
exceed the maximum working pressure of any component or
accessory used in the system.
Fluid
and
Solvent Compatibility
BE SURE that all fluids and solvents used are chemically compatible with the wetted parts shown in iheTECHNlCAL DATA
on
page 35. Always read the fluid and solvent manufacturer's
literature before using them in this sprayer.
HOSE SAFETY
High pressure fluid in the hoses can be very dangerous.
If
the
damage or misuse, the high pressure spray emitted from
it
can
hose develops
a
leak, split or rupture due to any kind
of
wear,
cause a fluid injection injury or other serious bodily injury or
property damage..
ALL FLUID HOSES MUST HAVE SPRING GUARDS ON
BOTH ENDS! The spring guards help protect the hose from
kinks or bends at or close
to
the coupling which can result in
hose rupture.
TIGHTEN all fluid connections securely before each use. High
pressure fluid can dislodge a loose coupling or allow high pressure spray
to
be emitted from the coupling.
tire hose forcuts, leaks, abrasion, bulging cover, or damageor
NEVER use a damaged hose. Before each use, check the en-
movement of the hose couplings.
If
any of these conditions
ex-
ist, replace the hose immediately. DO NOT try
to
recouple high
pressure hose or mend
it
with tape or any other device. A re-
paired hose cannot contain the high pressure fluid.
HANDLE AND ROUTE HOSES CAREFULLY.
Do
not pull on
hoses
to
move equipment. Keep hoses clear of moving parts
and hot surfaces of the pump and gas engine. Do not use fluids
or solvents which are not compatible with the inner tube and
coverofthe hose. DO NOTexpose Graco hose to temperatures
above
180'
F
(82''
C)
or below
-40°
F
(40'
C).
Hose Grounding Continuity
grounded spray system. Check the electrical resistance
of
your
Proper hose grounding continuity is essential to maintaining a
fluid hoses at least once a week.
If
your hose does not have a
tag on it which specifies the maximum electrical resistance,
contact the hose supplier or,manufacturer for the maximum resistance limits. Use a resistance meter in the appropriate range
for your hose to check the resistance. lfthe resistance exceeds
the recommended limits, replace
it
immediately. An un-
grounded or poorly grounded hose can make your system hazardous. Also read FIRE
OR
EXPLOSION HAZARD.
FIRE'OR
EXPLOSION
HAZARD
Static electricity is created by the flow of fluid through the pump
2.
Fluid
hoses: use only grounded hoses with a maximum of
and hose.
If
every part of the spray equipment is not properly
500feet(l50m)combinedhoselen
thtoensuregrounding
grounded, sparking may occur, and the system may become
continuity. See Hose Grounding
8
ontlnuity.
hazardous. Sparking may also occur when plugging in or un-
3. Spraygun:obtain grounding through connection to a prop-
plugging a power supply cord or using a gasoline engine.
Sparks can ignite fumes from solvents and the fluid being
erly grounded fluid hose and sprayer.
sprayed, dust particles and other flammable substances,
4.
Object being sprayed: according to local code.
fire orexplosion and serious bodily injury and property damage.
whether you are spraying indoors oroutdoors, and can cause a
5,
Fluid
supp~y
conta;ner:
to
local
code.
6.
All solvent pails used when flushing, according to local
If
you experience any static sparking or even a slight shock
while using this equipment,
STOP
SPRAYING IMMEDI-
code. Use only metal pails, which are conductive. Do not
ATELY. Check the entire system for proper grounding. Do not
place the pail on a non-conductive surface, such as paper
use the system again until the problem has been identified and
7,
To
conti.;iru
when
orrelieving
or cardboard, which interrupts the grounding continuity.
corrected.
pressure, always hold a metal part of the gun firmly to the
Grounding
side of a grounded metal pail, then trigger the gun.
To reduce the risk of static sparking, ground the sprayer and all
Flushing
safety
other spray equipment used or located in the spray area.
tions
for
your
area
and
type
of
equipment,
BE
SURE
to
ground
splashing by following theflushlng procedure given
on
Page
10
CHEcKyour
localelectricalcodefordetailedgrounding
inStluC-
Reduce the risk of fluid injection Wry, static sparking, or
all of this spray equipment:
of this manual. FollowthePressure Relief Procedureon page
4,
and remove the spray tip before flushing. Hold ametal part of
1.
Sprayer: connect a ground wire and clamp (supplied) to a the gun firmly
to
the side of a grounded metal pail and use the
true earth ground. lowest possible fluid pressure during flushing.
GASOLINE ENGINE HAZARD
NEVER
fill
the fuel tank while the engine is running
or
hot. fuel NEVER operate the engine in a closed building unless the en-
spilled
on
a hot surface can ionite and cause a fire. cline exhaust is DiDed outside. The exhaust contalns carbon
307-893
5
SETUP
1.
Connect Hose
and
Gun.
Refer
to
Fig
6-1.
a. Remove the plastic cap plug from the filter outlet
nipple and screw the
50
ft.
(15.2
m) main fluid
hose onto the nipple.
b. Connect the whip end hose between the fluid
hose and the gun inlet connection.
c. Don't use thread sealant; and don't install the
spray tip yet!
WARNING
be sure the hoses are electrically conductive. That
If
you are supplying your own hoses and spray gun,
the gun has a tip guard and that each part is rated for
at least
3000psi(210
bar) Working Pressure. This is
to
reduce the risk of serious bodily injury caused by
static sparking, fluid injection or over-pressurization
and rupture of the hose or gun.
~~ ~ ~~ ~ ~
2.
Two
Gun Hookup.
Refer to Fig
6-1.
Remove the
cap from the secondary hose outlet and attach an accessory hose and gun to the
114
npsm(m) nipple.
CAUTION
To
avoid damaging the pressure control, which may
result in poor equipment performance and component Clamage, follow these precautions:
1.
Always use nylon spray hose at least
50
ft.
2.
Never use awire braid hose as it is
too
rigid
to
act
3.
Never install any shutoff device between the fil-
4.
Always use the main filter outlet for one gun
op-
(15.2
m) long.
as a pulsation dampener.
ter and the main hose. See Fig
6-1.
eration. Never plug this outlet.
3.
Fill Packing Nuwet-Cup.
Refer to Fig
6-1.
Fill the
packing nuffwet-cup
1/3
full with Graco Throat Seal
Liquid (TSL), supplied.
4.
Check the engine
oil
level.
Refer
to
the Honda engine manual, supplied. This is a summary of the information: Remove one of the oil fill plugs; the oil
should be almost overflowing. See Fig
7-1.
Add oil
as necessary.
tergent oil, SAE
1
OW-40,
classified "FOR SERVICE
Recommended lubricatiqn oil. Use a high quality de-
SE
or
SF",
for regular use and for the breaking-in
of
a new engine.
"
PRESSURE CONTROL
ONlOFF
SWITCH
SECONDARY
H
OUTLET
1/4
NP
WHIP END HOSE
Fig
6-1
6
307-893
SETUP
5.
Be sure your system is properly grounded
be-
fore operating it.
Read and follow the warning sec-
tion,
FIRE
OR
EXPLOSION HAZARD,
on
page
5.
6.
Fill the gas tank.
See the
FUELING
section, below.
7.
Flush the pump
to
remove the lightweight oil which
was left in
to
protect pump parts after factory testing.
a. Before using water-base paint, flush with
mineral spirits followed by soapy water, and
then a clean water flush.
b. Before using oil-base paint, flush with mineral
c. See
FLUSHING GUIDELINES
on page 11 for
8. Prepare the paint
according
to
the manufacturer's
spirits only.
the flushing procedure.
recommendations.
a. Remove any skin that may have formed.
b. Stir the paint to mix pigments.
c.
Strain the paint through a fine nylon mesh
bag (available at most paint dealers) to
spray tip. This is probably the most important
remove particles that could clog the filter or
step toward trouble-free spray painting.
9.
Keep the sprayer uprlght and level
during opera-
tion and whenever it
is
being moved.
\
/
MUFFLER
//
Fig
7-1
FUELING
-
WARNING
Gasoline
is
extremely flammable and explosive un-
der certain conditions.
Always shut
off
the engine before refueling.
Refuel in a well-ventilated area.
Do
not smoke or allow flames or sparks in the area
where the engine is refueled or where the gasoline
is
stored.
securely closed after refueling.
Do
not overfill the tank. Make sure the filler cap is
por or spilled fuel can ignite.
If
any fuel is spilled,
Be careful
not
to spill fuel when refueling. Fuel va-
engine.
make sure the area is dry before starting the
1.
Fuel specifications.
Use automotive gasoline with
a
pump octane number
(
or
86
or higher
or a research octane number of 91 or higher. Un-
deposits.
leaded fuel minimizes combustion chamber
2.
Gasolines containing alcohol (gasohol).
Do not
use gasohol containing methanol
if
it contains
no
cosolvents and corrosion inhibitors for methanol. If it
does contain such additives, still do not use it
if
it con-
tains more than
5%
methanol.
Do not use gasohol containing more than
10%
ethanol.
high as stated in
Fuel specifications.
Be sure the gasohol has octane ratings at least as
NOTE:
The' Honda engine warranty does not cover
damage resulting from the use of gasolines containing alcohol. See the
HONOA
engine manual
for more information.
3.
General.
Do
not
use oil and gasoline mixtures or
contaminated gasoline. Avoid getting dirt, dust or
water in the fuel tank.
4.
Tank capacity. 0.66
gallons
(2.5
liter). Always leave
5.
Shut
off
the engine before refueling.
6. After refueling, tighten the fuel tank cap flrmly.
at least
1/2
in. at the top of the tank for expansion.
307-893 7
~~
NOTE:
Refer to Fig
9-1
as you start the sprayer.
Use this procedure each time you start the sprayer to
help ensure the sprayer is ready to operate and that you
start it safely.
NOTE:
When starting a sprayer that
IS
NOT primed, re-
move the spray tip.
1.
Check the gas tank.
Open the fuel shutoff valve.
2.
Check the engine oil level.
NOTE:
The engine stops automatically if it is low on oil. If
you try to start it again without adding more oil, a
red light on the rear of the engine'lights as you
pull the starter rope.
3.
If
a
secondary hose and gun is not installed,
be
4.
Place the suction tube into the paint container.
5.
Flip the pressure control switch to OFF.
6.
Open the fuel shutoff lever
by pushing it in the di-
7.
Be sure the spark plug cable is firmly pushed
sure the cap is securely plugging the nipple.
!
rection
of
the arrow.
onto the'plug.
Never attempt to start the engine unless fluid pres-
sure is relieved and the pressure control ON/OFF
switch
is
OFF. Trying to stat? the engine under load
will damage the recoil system.
IcAuT1oNl
8.
Set the pressure adjusting knob
all the way coun-
terclockwise to the lowest pressure setting.
9.
Pull the throttle lever away from the fuel tank
to
maximum position (fully left).
10.
If
the engine is cold,
completely close the gray en-
gine choke lever, located beneath the air cleaner.
If
the engine is warm,
you may need to close the
choke only half way or not at all.
11.
Turn the engine switch to ON.
12.
Grasp the starter rope.
Holding the frame with one
hand, pull the rope rapidly and firmly. Continue holding the rope as you let it return.
Pull
and return the
rope until the engine starts.
WARNING
Letting the rope return too fast may cause serious
bodily injury
if
the rope hits someone. It could
also
jam the rope in the recoil assembly.
~
13.
Open the choke.
In cold weather you may have to
opening it to keep the engine running. Otherwise,
leave the choke closed for
10
to
30
seconds before
open the choke as soon as the engine starts.
14.
Disengage the gun safety latch.
15.
To start the pump,
open the filter's pressure drain
valve. Turn the pressure control switch to
ON
and
slowly increase the pressure setting until the pump
starts to cycle slowly. Cycle the pump slowly until
fluid is flowing smoothly from the pressure drain
valve, indicating that the pump is fully primed. Close
the pressure drain valve. Holding a metal part of the
gun firmly against and aimed into a grounded metal
container, squeeze the trigger until fluid is flowing
smoothly from the gun. Release the trigger and engage the gun safety latch.
16.
Install the spray tip in the gun.
See the separate tip
manual,
307-848.
I'wARN'NGl
To
reduce the risk of serious bodily injury from from
the tip guard removed.
fluid injection,
NEVER
operate the spray gun with
17.
Adjust the engine speed and pump pressure.
First set the throttle lever to the maximum
RPM
setting (fully left). Trigger the gun onto a test paper to
check the spray pattern and atomization. Adjust the
pressure adjusting knob until you get a good pattern.
Then slowly lower the throttle setting as far as you
can without changing the spray pattern.
CAUTION
Always use the lowest possible pressure and throttle
setting to increase the life of the sprayer. Higher settings cause excessive clutch cycling as well as tip
and pump wear.
Close
the fuel valve whenever you are transporting
CAUTION
the sprayer to prevent fuel from flooding the
engine.
Keep the sprayer upright and level when operating
case oil from leaking into the combustion chamber
it and when transporting it. This prevents crank-
which makes startuD verv difficult.
8
307-893
Fig
9-1-
307-893
9
MAINTENANCE
-WARNING
I
To
reduce the risk
of
serious bodily injury, including
fluid injection or splashing in the eyes or on the skin,
or injury from moving parts, always follow the
Pres-
sure Relief Procedure Warning
on page
11
before
checking, adjusting, cleaning and shutting down the
sDraver. Disconnect the SDark DIua.
CAUTION
tions, refer to the separate engine manual, supplied.
For detailed engine maintenance and specifica-
DAILY:
Checkthe engine
oil
level and
fill
as necessary.
WEEKLY:
Check the level of the
TSL
in the displace-
DAILY:
Check and
fill
the gas tank.
ment pump packing nut. Fill it
if
necessary. Keeping
TSL
in the nut helps lubricate the packings.
AFTER THE
FIRST
20
HOURS
OF
OPERA-
TION:
Drain the oil and refill with clean oil.
the element. Replace the element
if
necessary.
If
operat-
WEEKLY:
Remove the cover of the air filter and clean the
Oil.
ing in an unusually dusty environment, check the filter
daily and replace
if
necessary.
SPARK PLUG:
Use only a (NGK)
BPGES
or
BPR6ES
plug. Gap the plug to
0.025-0.030
in.
(0.7-0.8
mm). Be
Replacement elements can be purchased from your
lo-
sure to use a spark plug wrench when installing and re-
tal
Honda dealer. moving the plug.
AFTER EACH
100
HOURS
OF
OPERATION:
Change
10
307-893
FLUSHING GUIDELINES
I
WARNING
Pressure Relief Procedure
Toreduce the riskof serious bodily injury, including Ruid
the
gun
firmly
to
the
side
of
a
grounded
metal
pail,
4.
Disengage the gun safety latch. Hold a metal part of
skin, or injury from moving parts or electric shock, al-
injection, splashing fluid or solvent in the eyes or on the
and
trigger
the
gun
to
relieve
pressure,
ways follow this procedure whenever you shut
off
the
5.
Engage
the
gun
latch.
sprayer, when checking or servicing any pari of the
6.
Open the pressure drain valve, having a container
spray system, when installing, cleaning or changing
ready to catch the drainage. Leave the valve open
spray tips, and whenever you stop spraying.
.
until you are ready to spray again.
1.
Engage the gun safety latch.
7.
Disconnect the spark plug cable
2.
Turn the engine ON/OFF switch to OFF.
If
you suspect that the spray tip or hose
is
completely
3. Flip the pressure control switch to OFF.
clogged, or that pressure has not been
fully
relieved
af-
ter fobwing the steps above,
VERY
SLOWLY loosen
the tip guard retaining nut or hose end coupling and re-
clear the tip or
hose.
lieve pressure
gradually, then loosen completely. Now
1
2
When to Flush
1.
New Sprayer.
Your new GM3500'Sprayer was fac-
tory
tested in lightweight oil which was left in to pro-
tect pump parts.
Before
using
water-base paint, flush with mineral
water flush.
spirits followed by soapy water, and then a clean
only.
Before using oil-basepaint, flush with mineral spirits
2.
Changing Colors.
Flush with a compatible solvent
such
as
mineral spirits or water.
3.
Changing from water-base to oil-base paint.
Flush with warm, soapy water, then mineral spirits.
4.
Changing from oil-base to water-base paint.
Flush with mineral spirits, followed by warm, soapy
water, then a clean water flush.
Water-base paint: flush with water, then mineral
spirits and leave the pump, hose and gun filled with
mineral spirits.
Shut
off
the sprayer, remove the
spark plug cable, and open the pressure drain valve
to relieve pressure and leave it open.
Oil4asepaint:flush with mineral spirits. Shut
off
the
sprayer, remove the spark plug cable, and open the
pressure drain valve to relieve pressure and leave it.
open.
5.
Storage.
-
CAUTION
NEVER leave water in the sprayer
if
there is the
slightest chance it could freeze. Push the water out
with mineral spirits. Water left to freeze in the pressure control tube prevents the sprayer from being
started and causes serious damage to the pressure
control.
6.
Startup after storage.
spirits with soapy water and
then a
clean water flush.
Before using water-base
paint,
flush
out mineral
*
When using oil-base paint, flush out the mineralspir-
its with the paint to be sprayed and the sprayer is
ready
to
use.
Continued on page
12.
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