Graco 237-426 Operation manual

INSTRUCTIONS–P ARTS LIST 308–465
Rev. B
Supersedes A
30:1 PRESIDENT, CARBON STEEL, CART MOUNTED
Heated Air-Assisted Airless
Electrostatic Package
See the Data Sheet, 305–669, for application information
3000 psi (210 bar) Maximum System Working Pressure
100 psi (6.9 bar) Maximum Air Inlet Pressure
Model 237–426, Series A
This complete package includes a pump,
an electrostatic air-assisted airless–spray gun with size a 41 1 spray tip,
a portable cart, 25 ft. (7.6 m) air and fluid hoses,
air and fluid controls, and a fluid feed.
IMPORTANT
This manual provides the basic safety , installation and
operation information for the spray system. For your
safety , also read the component manuals supplied with
this system before operating it.
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
COPYRIGHT 1994, GRACO INC.
This manual contains important
warnings and information.
READ AND RETAIN FOR REFERENCE
04133

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Table of Contents
Symbols 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setup 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Component Information 8. . . . . . . . . . . . . . . . . .
Operation 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranty 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Phone Numbers 20. . . . . . . . . . . . . . . . . . . . . . . . .
Symbols
Warning Symbol
WARNING
This symbol alerts you to the possibility of serious
injury or death if you do not follow the instructions.
Caution SymbolCAUTION
This symbol alerts you to the possibility of damage to
or destruction of equipment if you do not follow the
corresponding instructions.
WARNINGWARNING
FIRE, EXPLOSION AND ELECTROSTATIC SHOCK HAZARD
Improper grounding, poor air ventilation, open flames or sparks can cause a hazardous condition
and result in a fire, explosion or electrostatic shock and other serious injury .
D
Electrostatic equipment must be used only by trained, qualified personnel who shall be under -
stand with the requirements stated in this instruction manual and the electrostatic gun manual.
D Ground the equipment, the object being sprayed and all other electrically conductive objects in
the spray area. Proper grounding dissipates static electricity generated in the equipment. See
Ground the system on 7.
D If there is any static sparking while using the equipment, stop spraying immediately . Identify
and correct the problem.
D When flushing or purging electrostatic equipment, use solvents with a flash point equal to or
greater than that of the fluid being sprayed.
DT o clean the exterior of the electrostatic equipment , use solvents with a flash point higher than
100_F (38_C).
DRemove
all solvent from the system before reactivating the electrostatic spray gun.
D Use only non-sparking tools to clean residue from the booth and hangers.
D Spray only in a ventilated spray booth. Electrically interlock the gun air supply with the ventilators
to prevent operation of the electrostatic power supply unless ventilating fans are running.
D Do not smoke in the spray area.
D Extinguish all open flames or pilot lights in the spray area.
D Do not turn on or of f any light switch in the spray area.
D Electrically disconnect all equipment in the spray area.
D Keep the spray area free of debris, including solvent, rags and gasoline.
D Do not operate a gasoline engine in the spray area.



WARNINGWARNING
FLUID INJECTION HAZARD
Spray from the gun, hose leaks or ruptured components can inject fluid into your body and cause
extremely serious injury
, including the need for amputation. Splashing fluid in the eyes or on the skin
can also cause can also cause serious injury .
D
If a fluid injection occurs, get emergency medical care at once. Do not treat as a simple cut. T ell
the doctor exactly what fluid was injected.
D Give the doctor this information: Injection into the skin is a traumatic injury . T reat the injury surgi -
cally as soon as possible. Do not delay treatment to research toxicity . T oxicity is a concern with
some exotic coatings injected directly into the blood stream. Consultation with a plastic surgeon
or reconstructive hand surgeon may be advisable.
D Do not point the spray gun at anyone or any part of the body .
D
Do not put hand or fingers over the spray tip.
D Do not stop or deflect fluid leaks with your hand, body , glove or rag.
D Do not “blow back” fluid, this is not an air spray system.
D Always have the tip guard and the trigger guard on the spray gun when spraying.
D Check the gun dif fuser operation weekly . Refer to the gun manual.
D Be sure the gun trigger safety operates before spraying the gun.
D Lock the gun trigger safety when you stop spraying.
D Follow the Pressure relief procedure on page 10 if the spray tip clogs and before cleaning,
checking or servicing the equipment.
DT ighten all fluid connections before each use.
D Check the hoses, tubes and couplings daily . Replace worn or damaged parts immediately . Per -
manently coupled hoses cannot be repaired.
D Handle and route hoses and tubes carefully. Keep hoses and tubes away from moving parts and
hot surfaces. Do not use the hoses to pull equipment. Do not expose Graco hoses to tempera -
tures above 180 _F (82_ C) or below –40 _F (–40_C).
MOVING P ARTS HAZARD
Moving parts, such as the air motor piston, which can pinch or amputate fingers.
D Never operate the equipment with the air motor plates removed.
D Keep clear of any moving parts when starting or operating the equipment.

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EQUIPMENT MISUSE HAZARD
Equipment misuse can cause the equipment to rupture, malfunction or start unexpectedly and result
in serious injury .
D
This equipment is for professional use only .
D
Read all instruction manuals, tags, and labels before operating the equipment.
D Use the equipment only for its intended purpose. If you are in doubt about this, call Graco T echni-
cal Assistance at 1–800–543–0339.
D Do not alter or modify this equipment. Use only genuine Graco parts and accessories.
D Check equipment daily . Repair or replace worn or damaged parts immediately .
D
Do not exceed 3000 psi (210 bar) maximum working pressure at 100 psi (6.9 bar) maximum
incoming air pressure at the pump, or the maximum working pressure of any accessory used
with it.
D Do not move or lift pressurized equipment.
DUse fluids or solvents which are compatible with equipment wetted parts. Refer to the T echnical Data
section of all equipment manuals. Read the fluid and solvent manufacturer ’ s warnings.
D Fluid hoses must have spring guards on both ends to protect it from rupture caused by kinks or
bends at or close to the couplings.
D Comply with all applicable local, state and national fire, electrical and other safety regulations.
TOXIC FLUID HAZARD
Improper handling of hazardous fluids or inhaling toxic fumes can cause extremely serious injury ,
even death, due to splashing in the eyes, ingestion, or bodily contamination.
D Know the specific hazards of the fluid you are using.
D Store hazardous fluid in an approved container . Dispose hazardous fluid according to all local,
state and national guidelines.
DW ear appropriate clothing, gloves, eyewear and respirator .
FLUID HEATER HAZARD
Follow these precautions to reduce the risk of a serious injury from burns or a fire.
D The heater is equipped with an ordinary power cord and should not be operated in hazardous
locations as defined in NFP A 33 or your local fire code.
D Do not touch the heater during operation; it is very hot.
WARNINGWARNING

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Setup
I. Prepare the operator.
All persons who operate the system should be trained
in the safe, efficient operation of all system compo -
nents as well as the proper handling of the chemical
coating. At a minimum, all operators should
thoroughly read the safety , installation and operation
sections of this manual and the component manuals.
II. Prepare the site.
1. Use a minimum recommended 7 HP (5.8 kW) air
compressor for ef ficient operation.
2. Clear obstacles and debris that could hinder the
operator’ s movement.
3. Bring an air line from your compressed air supply
to the pump location. Be sure the air is dry and
filtered. Install a bleed–type master air valve (A)
upstream from the pump. Another master air valve
(32) is supplied with the package. When the
bleed–type master air valve is closed and the
pump air regulator (31a) is opened, the valve
relieves all air pressure to the system.
4. Have a grounded waste pail available to use when
draining the fluid filter .
5. V
entilate the spray booth.
To prevent hazardous concentrations of
toxic and/or flammable vapors, spray
only
in a properly ventilated spray booth.
Never operate the spray gun unless
ventilation
fans are operating. The air supply to the
gun must be electrically interlocked with the ventila-
tors
to prevent operation of the power supply unless
ventilating fans are running.
Check and follow all of the national, state and local
codes
regarding air exhaust velocity requirements.
WARNING
KEY
Components you must supply:
A Bleed-type master air valve
Required for pump, order
part no. 107–142, 1/4” npt(f)
B Air filter . Order part no.
106–149, 1/2 npt(f)
C Air supply line
D Grounded 5 gallon metal pail
E Air line moisture trap
Components supplied with package:
1 30:1 President pump
2 Fluid heater
3 Back pressure regulator
28 Fluid filter (not visible)
29 Filter drain valve
(not visible)
31a Pump air regulator
31b Gun air regulator
32 Bleed–type air valve
54 Gun air hose
55 Electrostatic
Air-assisted
airless spray gun
64 Gun fluid hose
66 Pump ground wire
71 Whip hose
A
Fig. 1
B
E

C
D
3
71
54
64
1
66
31b
31a
32
2
8
28
29
55


Setup
III. Unpack the system.
1. In addition to the assembled unit, these compo -
nents are packed separately: suction assembly ,
hose set, gun. In Fig. 1 items identified with a
number are supplied with the system. Items identi -
fied with a letter are supplied by you.
2. These are the manuals you should receive:
306–981 30:1 President pump
308–294 Electrostatic air-assisted
airless spray gun
307–273 Fluid filter
307–805 Fluid heater
306–860 Back pressure regulator
308–167 Air regulator
306–861 Ball valve
308–136 Cart
IV. Connect the hose set and gun to the
system. See
Fig. 1 and 2 .
Fig. 2


To
gun air regulator (31b) outlet
T o fluid filter (28) outlet
T o back pressure regulator (3) outlet


Ref
54
19
64
64
54
55
1. Connect the special electrostatic air hose (54) be -
tween the gun air regulator (31b) and the air inlet
of the spray gun (55). The gun inlet and air hose
have left hand threads.
2. Connect one blue fluid hose (64) to the fluid filter
(28) outlet. Connect the other blue fluid hose to the
back pressure regulator (3) outlet. These are
1/4–18 swivel fittings.
3. Connect the whip hose (19) to the fluid inlet of
the spray gun (55). These are 1/4–18 swivel fit -
tings.
4.
Press the exhaust tube (F) onto the barbed
adapter on the bottom of the gun handle. Secure
the tube with the clamp provided. See Fig. 3.
Fig. 3 01992A
F
5. V
erify that all fittings throughout the system are
tightened securely .
6.
Use a tie strap to secure the insulated hose to the
leg of the cart. This provides strain relief so that
tugs on the heavy hoses don’t damage the hose
connections.

7
308-465
Setup
V. Ground the system.
WARNING
To reduce the risk of static sparking, ground the
pump and all other equipment used or located in
the spray area. Check your local electrical code for
detailed grounding instructions for your area and
type of equipment. Ground all of this equipment.
Also read FIRE, EXPLOSION OR ELECTROS -
TA
TIC SHOCK HAZARD on page 2 .
1.
Pump : one end of the ground wire (66) is already
connected to the air motor grounding lug. Connect
the clamp end of the ground wire to a true earth
ground. Connect the clamp end of the ground wire
to a true earth ground.
2. Air and fluid hoses : use only grounded hoses with
a maximum of 500 ft. (150 m) combined hose
length to ensure grounding continuity .
3. Heater: by plugging into a properly grounded elec -
trical outlet. If you use an extension cord, be sure
it is a 3-wire grounded cord which is properly sized
for the heater .
4. Air compressor : according to manufacturer ’ s
recommendations.
5.
Electrostatic spray gun: grounding is obtained
through connection to a properly grounded air
supply hose. Use only Graco electrically conduc -
tive air supply hose (34) as supplied with this
system. Loosen the grounding lug locknut (W) and
washer (X). Insert the bare end of the air hose
ground wire into the slot in the lug and tighten the
locknut securely . Connect the air hose ground wire
to the air motor grounding lug. See Fig. 4.
Fig. 4
2Connect
air hose ground wire to
pump grounding lug
1
W
X
30
0864
1
Pump ground wire.
Connect to a true earth ground
2
6. Spray gun: grounding is obtained through connec -
tion to properly grounded air and fluid hoses and
pump.
7. Object being sprayed: keep the work piece
hangers clean and grounded at all times. Contact
points must be sharp points or knife edges. Use a
megohmeter or a circuit tester buzzer or light to
verify that the parts are properly grounded.
8. All electrically conductive objects or devices in the
spray area, including paint containers, wash cans.
9. All persons entering the spray area: shoes must
have conductive soles, such as leather , or
personal grounding straps must be worn. Rubber
of plastic soles are not conductive. The operator
must not wear gloves which insulate the hand from
the spray gun. The gloves must be conductive or
modified as shown in Fig. 5. Use the gun cover ,
supplied, to help protect your hand and the gun
from overspray .
Fig. 5
3 in. (76 mm) square
cut out and finger
of glove cut of f
10. The floor of the spray area must be electrically
conductive and grounded. Do not cover the floor
with cardboard or any non–conductive material
which would interrupt grounding continuity .
11.
Flammable liquids in the spray area must be kept
in approved, grounded containers. Do not store
more than the quantity needed for one shift.
12. Fluid supply container: according to local code.
13. All solvent pails used when flushing , according to
local code. Use only metal pails, which are con -
ductive. Do not place the pail on a non-conductive
surface, such as paper or cardboard, which inter -
rupts the grounding continuity .


System Component Information
I. How to use the air-assisted airless
electrostatic spray gun.
The air hose supplies air to the spray gun. Part of the
air operates the turbine and the rest of the air assists
in the atomization of the fluid being sprayed. The
turbine generates power which is converted by the
power cartridge to supply high voltage current to the
gun’ s ionizing electrode.
The pump supplies fluid to the hose and gun, where
the fluid is electrostatically charged as it passes the
electrode. The charged fluid is attracted to the
grounded work piece, wrapping around and evenly
coating all surfaces.
The air control valve (C) controls all of the air to the
gun air cap.
See Fig. 7 for how to operate the trigger safety latch.
See the gun instruction manual, 308–294, for detailed
information, including troubleshooting, cleaning and
repair.
Always hang the gun in its bracket (F) with its
nozzle pointing down to prevent solvent from
running into the gun air passages. See Fig. 8.
Solvent in the gun air passages can cause poor
atomization and excessive current demands and
damage the gun.
CAUTION
Fig. 6
KEY
AES
indicator light
B ES On–Of f lever
I is ON and 0 is OFF
C Air control valve
D Electrode
E
Air cap
BC
DE
01947
A
Fig. 7


UNLOCKED trigger
safety latch
LOCKED trigger
safety latch


Fig. 8
02010A
F
II. Fluid heater.
See Fig. 9.
The heater (3) used in this system is a high mass
heater . Always circulate the fluid when the heater is
operating to prevent overheating and damaging the
fluid. Do not use catalyzed material in this heater .

9
308-465
System Component Information
III. How to use the 3–way valve.
See Fig. 9.
Heated systems require that the fluid circulate
constantly when the heater is turned on. The 3-way
valve (7) supplied with this system allows you to drain
or circulate the fluid. The words Drain and Circulate
are marked on the valve.
1. In the Drain position and with the gun untriggered,
the fluid returns from the gun, to the back pressure
regulator (3), to the hose (19) and to the 3–way
valve (7) which directs the fluid out the drain hose
(8). This position is used when flushing the system
and when relieving system pressure.
2. In the Circulate position, with the gun untriggered,
fluid returns from the gun, to the back pressure
regulator (3), to the hose (19) and to the 3–way
valve (7) which directs the fluid back into the pump
intake. This position is used during normal opera -
tion and it helps keeps the fluid at a constant
temperature.
Fig. 9
32
19
7
8
IV. How to adjust the air and
back pressure regulators. See Fig. 10.
This system has two air regulators. As you look at the
system, the regulator (31a) on the left of the pump
regulates air to the gun and the regulator (31b) on the
right regulates air to the pump.
1. Always open air regulators slowly to prevent surg -
ing during startup.
2. T o open the regulator , which allows air to flow , turn
the T–handle IN (clockwise). T urn the T–handle
OUT (counterclockwise) to close off the air flow .
Be sure the jam nut under the T–handle does not
interfere with your adjustments. T ighten the jam
nut to lock in the setting, if desired.
3. The back pressure regulator (3), located on the
fluid return side of the circulating system, acts as a
flow control. Use it to balance the pressure of the
circulating fluid so that the pump sucks in a suf fi-
cient volume of fluid without running too fast or too
slow. T urn the regulator IN (clockwise) to restrict
fluid and slow down the pump. T urn the regulator
OUT (counterclockwise) to allow more flow which
speeds up the pump. See Fig. 10.
4. T o open the back pressure regulator , which allows
fluid to flow , turn the knob IN (clockwise).
5. Adjust the back pressure regulator only when the
gun is triggered and fluid is flowing through the
regulator for an accurate setting.
Fig. 10
CW
CCW
31b
31a
3


10 308-465
Operation
I. Pressure relief procedure
WARNING
To reduce the risk of serious injury , including
splashing fluid or solvent in the eyes or on the skin,
always follow the procedure below when you stop
spraying or shut of f the pump, check or service any
part of the system, or install, clean or change spray
tips.
1.
Engage the gun trigger safety .
2. T
urn the ES On/Of f valve lever to OFF .
3. T
urn off the heater (turn to 0).
4. T
urn the 3-way valve (7) to Drain.
5.
Close the bleed-type master air valve (A,14).
6. Close the air regulators (31a,31b).
7. Disengage the gun trigger safety .
8.
Hold the gun firmly to a grounded metal pail.
T rigger the gun to relieve pressure.
9. Engage the gun trigger safety .
10. Open the drain valve (29), having a container
ready to catch the drainage.
If you suspect that the spray tip or hose is completely
clogged or that pressure has not been fully relieved,
very slow loosen the tip guard retaining nut or hose
end coupling and relieve pressure gradually . Clean the
tip or hose obstruction.
II. Flush the pump before the first use.
Flush with a solvent compatible to your fluid. Consult
the fluid manufacturer ’ s literature for recommenda -
tions. See Flushing on page 14.
III. Prime the system.
See Fig. 1 1.
1. Remove the air cap and spray tip from the gun.
2. Close the filter drain valve (29).
3. Put the suction tube into the fluid supply container .
4.
Hook the drain hose (8) on the waste pail.
5. T urn the 3-way valve (7) to the Drain position.
6. T urn the back pressure regulator (3) all the way
out (counterclockwise)
7. Make sure the air regulators (31a,31b) are closed.
8. Open the master air valves (A,32).
KEY
Components you must supply:
A Bleed-type master air valve
C Air supply line
2 Fluid heater
3 Back pressure regulator
28 Fluid filter (not visible)
29 Filter drain valve
(not visible)
31a Pump air regulator
31b Gun air regulator
32 Bleed–type air valve
A
Fig. 1 1
C
331b
31a
32
2
8
28
29

11
308-465
Operation
NOTE: In the next steps, the pump will cycle quickly
until air is purged.
9. Slowly turn on the pump air regulator (31b) until
the pump cycles slowly . When fluid flows from the
drain hose, turn the 3-way valve to Circulate.
10.
Hold the gun firmly to the grounded metal waste
pail. T rigger the gun while adjusting pressure at
the pump air regulator (31b) just enough to purge
the air and storage solvent out of the system.
When new fluid comes from the gun, release the
trigger . Engage the gun trigger safety .
11. T
urn IN the back pressure regulator (3) to raise the
system pressure until the pump stops.
12. Raise the air pressure to the pump to 35 psi (2.4
bar). Adjust the back pressure valve to set the
pump cycle rate at 1 stroke every 10 seconds.
13. T urn the heater dial to 3 . When adjusting the
heater , always allow the fluid to circulate and stabi -
lize (about 10 minutes) before checking the tem -
perature.
CAUTION
Be sure the fluid is circulating whenever the heater
is on to reduce the risk of damage to the fluid or
the heater .
14.
Use the fluid manufacturer ’ s recommendations for
temperature and adjust the heater accordingly . If
unknown, set the temperature to 1 10_F (43_ C) at
the outlet thermometer . Do not proceed until the
temperature has stabilized. Do not allow the fluid
to exceed 140 _F (60_ C) unless your fluid
manufacturer recommends higher temperatures.
15. Spray fluid into a waste pail for about 10 seconds
to bring heated material to the gun.
16. Hook the drain hose (8) on the fluid supply pail.

12 308-465
Operation
IV. How to set the fluid and air pressure.
1. Install the spray tip and air cap on the gun.
2. Adjust the pump air pressure regulator until the
pressure shown on the fluid filter gauge is about
900 psi (63 bar). This should require approximately
30 psi (2.1 bar) air pressure to the pump.
3. T est spray a pass or stationary horizontal pattern.
Hold the gun 10 to 12 in. (250 to 300 mm) from a
piece of paper . Stripes in the outer edges of the
pass or spots at the ends of the stationary pattern
are likely at this point.
NOTE: If there are no stripes or spots, lower the
fluid pressure until they appear before turning on
the air to the gun.
4. Partially trigger the gun so only air is emitted. Set
the gun air regulator to 50 psi (3.5 bar).
5. Use the gun’ s air control valve (C) to adjust the air
to the air cap until a good pattern is obtained.
6. Retest the spray pattern. If there are no stripes or
spots, you are ready to start spraying.
7. If there are stripes or spots in the spray pattern,
raise the pump air pressure until you raise the fluid
outlet pressure by about 100 psi (7 bar) and try
again. Continue to raise the fluid pressure in
100 psi (7 bar) increments until the pattern is full
and clean. Do not exceed 100 psi (7 bar) incoming
air pressure or 3000 psi (210 bar) fluid working
pressure.
NOTE: Always use the lowest fluid and air pres -
sure required for good atomization and spray pat -
tern for maximum fluid ef ficiency . Air pressure over
approximately 50 psi (3.3 bar) will cause turbu -
lence in the fan pattern, dirty air caps and slower
production capability .
WARNING
This system has a maximum air working pressure
of 100 psi (7 bar) which produces a maximum fluid
working pressure of 3000 psi (210 bar). Higher
pressure can cause the system to rupture or mal
-
function and result in serious injury .
8.
With the fluid pressure set, check the pump cycle
rate with the gun triggered and with the gun untrig -
gered. With the gun untriggered, the pump should
cycle at 10 cycles per minute. Adjust the back
pressure regulator (3) to obtain the desired circula -
tion rate. With the gun triggered, the cycle rate will
depend on tip size, but some circulation is always
desired.
KEY
Components you must supply:
A Bleed-type master air valve
C Air supply line
2 Fluid heater
3 Back pressure regulator
28 Fluid filter (not visible)
29 Filter drain valve
(not visible)
31a Pump air regulator
31b Gun air regulator
32 Bleed–type air valve
A
Fig. 12

C
331b
31a
32
2
8
28
29

13
308-465
Operation
Fig. 13
KEY
AES
indicator light
B ES On–Of f lever
I is ON and 0 is OFF
C Air control valve
D Electrode
E
Air cap
B
C
DE01947
A
9. Turn
the ES On/Of f lever (B) to ON. See Fig. 13.
NOTE: When spraying, the ES indicator light (A) will
glow , indicating the electrostatic charge. See Fig. 13.
10. Hold the gun tip (electrode) (D) 10–12 in. (250–300
mm) from the grounded part and trigger the gun.
Operate the gun like a conventional gun, but use a
slower stroke to allow the electrostatics to work
properly.
11.
When the ES On/Of f lever is turned on and you
trigger the gun, be sure there is a grounded work
piece 10–12 in. (250–300 mm) in front of the gun.
Never trigger the gun without a grounded work
piece in front of the gun. If you body is the best
ground or if you are holding the gun too far from
the work piece, the material will be attracted to and
cover you instead of the work piece.
WARNING
12. Use the gun air control valve (E) to adjust the
degree of atomization. Always use the lowest air
pressure possible for the most ef ficiency.
13.
A minimum of 40 psi (2.8 bar) air supply is
required to ensure full voltage from the power
supply . The gun may be operated at a lower inlet
air pressure, but you may lose some electrostatic
wrap.
V. You are now ready for production
spraying.
NOTE: If you stop spraying for more than 30 minutes,
T urn of f the heater to prevent overheating the fluid.
VI. When to shut down the system.
Shut down the system at the end of the work shift and
before checking, adjusting, cleaning or repairing the
system. Always follow the Pressure relief procedure ,
on page 10.

14 308-465
Operation
I. When to flush.
DBefore the first time use
D When changing colors
D Before fluid can dry or settle out in a dormant sys -
tem (observe the recommended fluid pot life on cat -
alyzed fluids)
D Before storing the system
II. How to flush.
WARNING
Before you flush, be sure the heater is turned of f
and the fluid has cooled. This is to reduce the risk
of a fire or explosion and serious injury .
WARNING
T urn the E/S valve OFF before flushing to reduce
the risk of static sparking, fire or explosion and
serious injury .
1. T
urn of f the heater and allow the system to cool.
2. T urn the gun ES On/Of f valve lever to OFF .
3.
Remove the air cap and spray tip from the gun and
clean separately. Do not reinstall at this time.
4. Open the filter drain valve (29). Unscrew the fluid
filter (28) bowl. Remove the screen. See manual
307–273. Reinstall the bowl without the screen.
5. Hook the drain hose (8) on the waste pail.
6. T urn the 3-way valve (7) to Drain.
7. T urn the back pressure regulator (3) all the out
(counterclockwise).
KEY
Components you must supply:
A Bleed-type master air valve
C Air supply line
2 Fluid heater
3 Back pressure regulator
28 Fluid filter (not visible)
29 Filter drain valve
(not visible)
31a Pump air regulator
31b Gun air regulator
32 Bleed–type air valve
A
Fig. 14

C
331b
31a
32
2
8
28
29

15
308-465
Operation
8. Put the suction tube into a grounded metal pail
with about 1 gal. (4 liters) of a compatible solvent.
9. Make sure the air regulators (31a,31b) are closed.
NOTE: The gun air regulator (31a) always stays
closed during flushing.
10. Open the master air valves (A,14).
11. Slowly turn on the pump air regulator (31b) until
the pump cycles slowly . When fluid flows from the
drain hose, turn the 3-way valve to Circulate. Set
the air pressure to 40 psi (2.8 bar).
12. Hold the gun firmly against and aimed into the
grounded metal waste pail. T rigger the gun. Slowly
adjust the pump air regulator setting until the fluid
flows freely . (Some air will spit from the gun until
the fluid arrives.)
13. T rigger the gun and decrease the pump air regu -
lator pressure as much as possible without stalling
the pump, and pump out all the solvent (air comes
through the gun).
14. For a first–time flush : trigger the gun and circulate
the solvent for 30 seconds.
For flushing after spraying fluid : trigger the gun
and circulate the solvent until the system is thor -
oughly cleaned. Repeat with clean solvent,
if necessary .
15.
Release the trigger and engage the gun trigger
safety.
16.
Remove the suction hose from the solvent and
place it in an empty container
.
17. T
urn the 3–way valve to Drain to purge solvent
from the system.
18. T urn the pump air regulator all the way out. Close
the master air valves (A,14).
19. Clean the filter screen, air cap and spray tip sepa -
rately.
20.
Open the filter drain valve (29). Remove the filter
bowl and reinstall the filter screen.
21. Thoroughly clean the inside and outside of the
suction tube.

16 308-465
Parts
Model 237–426, Series A
Includes items 1 to 72
Ref
No. Part No. Description Qty Ref No. Part No. Description Qty
1 223–586 PRESIDENT PUMP
See 308–106 for parts 1
2 220–522 VISCON2FLUID HEA
TER, 120V
See manual 307–805 for parts 1
3 206–819 BACK PRESSURE VALVE
See manual 307–860 for parts 1
4 100–840
90 _ELBOW , street, 1/4 npt(mxf) 4
5 162–453
NIPPLE, 1/4 npt x 1/4 npsm 4
6 166–998 FLUID INLET MANIFOLD, 1/4 npt(f) x
3/4 npt(f) x 3/4 npsm(f) swivel 1
7 214–711 3–WA
Y BALL V AL VE, 1/4 npt(m),
See 306–861 for parts 1
8 206–965 DRAIN HOSE, 1/4” ID,
cpld 1/4 npsm(f) 1
9 206–962 CHECK VAL
VE, 3/8 npt (mbe) 1
10 159–801 90_ADAPTER UNION,
3/8 npt(f) x 1/2 npsm(f) swivel 1
11 158–683 ELBOW 1
12 235–022
HOSE, pump to heater 1
13 156–849
NIPPLE, 3/8 npt x 3/8–18.6 sf 1
14 107–219
BUSHING, 3/4 npt(m) x 1/2 npt(f) 1
15 112–408
90 _CORD GRIP ELBOW ,
1/2 npt(m), includes nut,
washer , and grommet 1
16 110–160 CORD ASSY
, heater , 12 A WG,
600V
, 20 AMP , 105 _ C (221 _F),
6.5’ (2 m) long 1
17 224–044 CART
, portable
See 308–136 for parts 1
19 206–966 HOSE
1/4” ID x 18” (6 mm x 457 mm) 1
20 214–960 SUCTION HOSE, 3/4 npt(mbe),
3/4” ID x 3.5’ (19 mm ID x 1.06 m) 1
21 165–767 SUCTION TUBE, 3/4 npt(f) 1
22 100–016 LOCKW
ASHER, spring, 1/4” 2
23 100–270 CAPSCREW
, hex hd,
1/4–20 x 5/8” (16 mm) long 2
26 179–749
AIR MANIFOLD, 1/2 npt inlet,
two 1/2 npt outlets 1
27 150–286
ADAPTER, 3/8 npt (m x f) 1
28 218–029
FLUID FIL TER
See 307–273 for parts 1
29 210–658
BALL V AL VE, 3/8 npt x 1/4 npt (mbe),
See 306–861 for parts 1
30 156–877
NIPPLE, 1/2 npt, 2.5” (63.5 mm) 3
31 104–267 AIR REGULATOR
0–125 psi (0–9 bar) range
See 308–167 for parts 2
32 107–142 BLEED TYPE AIR VAL
VE,
1/2 npt (m x f) 1
44 206–994 THROAT SEAL LIQUID, 8 oz.
not shown 1
46 155–470
90 _ADAPTER UNION,
1/2 npt(m) x 1/2 npsm(f) swivel 1
48 101–180 AIR PRESSURE GAUGE,
0–200 psi (0–14 bar) 2
49 218–093
AIR HOSE, cpld 1/2 npt(mbe),
1/2” ID X 22” (13 mm ID X 559 mm) 1
50 222–297 45_ADAPTER UNION,
1/2 npt(m) x 1/2 npsm(f) swivel 1
51 158–491
NIPPLE, 1/2 npt, 1 5/8” (41 mm) long 1
52 166–999 ELBOW
, reducing street,
1/2 npt(m) x 1/4 npt(f) 1
53 102–254 SCREW
, hex hd, 1/4–20 x
7/8” (22 mm) long 4
54 237–570 AIR HOSE , electrically conductive
cpld 1/4–18 npsm
5/16” ID x 25’ (7.9 mm ID x 15.2 m) 1
55 236–030 ELECTROSTATIC
AIR–ASSISTED
AIRLESS SPRA Y GUN
See manual 308–294 for parts 1
56 GG3–411 SPRAY
TIP 1
59 167–002 INSULATOR, heat 4
60 100–527 W
ASHER, wrought, 1/4” 2
61 155–494 90_ADAPTER UNION
3/8 npt(m) x 3/8 npt(f) swivel 1
62 100–509
PLUG, pipe, sq hd, 1/4 npt 3
63 188–595 PUMP MOUNTING PLATE 1
64 237–494 FLUID HOSE SET
, includes:
two fluid hoses, cpld 1/4 npsm(fbe)
swivel, spring guards both ends,
1/4” ID x 25’ (6 mm ID x 7.6 m)
and hose insulator 1
65 102–814 FLUID GAUGE 1
66 237–569 GROUND WIRE 1
67 169–797
NIPPLE, 1/4 npsm x 1/8 npt 3
68 169–795
MANIFOLD, 1/8 npt(f) 1
69 100–139 PLUG, hex socket, 1/8 npt 1
71 214–699
WHIP HOSE, cpld 1/4 npsm (fbe),
3/16” ID x 6 feet
(4.8 mm x 1.8 m) 1
72 157–416 SWIVEL ADAPTER 1
Manual Change
Summary
Assembly
Changed Part Status Ref No. Part No. Name
237–426
Package Old New
Old
New
Old
New
Delete(1)
Add (1)
Delete
Old
New
15
15
19
19
64
64
64b
67
70
71
71
102–363
112–408
214–701
206–966
222–407
237–494
––
169–797
159–840
214–701
214–699
Elbow
Elbow
Hose
Hose
Hose set
Hose set
Hose
Nipple
Adapter
Hose
Hose



Parts
66
17
49
20
21
6
22
23
63
30
14
16
15
74
2
11
10
12
4
A
A
B
B
Ref
12
C
28
27
29
8
5
62
65
61
13
26
31 48
48
31 46
52
5
30
62
53
32
30
50
51 62
59
543
19
60 53
C
1
Model 237–426, Series A
Includes items 1 to 72
9
72
04132
55,56
54
71
67
69
68
70
64
67
54

18 308-465
Notes



Notes

 
Technical Data
Maximum Fluid W orking Pressure 3000 psi (210 bar) . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Air Operating Pressure 100 psi (6.9 bar) . . . . . . . . . . . . . . . . . . . . . . . . . .
Pump Air Consumption free flow: 20 scfm at 100 psi (0.56 m
3
/min at 6.9 bar) . . .
Gun Air Consumption 8 scfm at 60 psi (0.22 m
3/min).
. . . . . . . . . . . . . . . . . . . . . . .
Heater Electrical Requirement 2000 W atts, 1 10 V , 16.7 Amp . . . . . . . . . . . . . . . . . .
Wetted Parts
Pump Carbon steel, chrome and zinc plating, PTFE,
R
. . . . . . . . . . . . . . .
304/316/420/17–4 pH stainless steel,
tungsten carbide, leather
Fluid heater 304 stainless steel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gun 304 stainless steel, nylon, PEEK, UHMWPE, . . . . . . . . . . . . . . . . . . .
tungsten carbide, glass-filled nylon
Fluid filter Carbon steel, PTFE , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
304/316 stainless steel, polyethylene
Fluid fittings Carbon steel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Back pressure fluid regulator T ungsten carbide, . . . . . . . . . . . . . . . . . . . .
cadmium and zinc–plated carbon steel,
303/416 stainless steel, Delrin
R
, chrome plated stainless steel
Fluid hose and tubing Nylon. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTE: all 304, 316 and 17–4 pH SST are electropolished and/or passivated.
Delrin
R R
is a registered trademarkof the Du Pont Company .
The Graco Warranty and Disclaimers
WARRANTY
Graco
warrants all equipment manufactured by it and bearing its name to be free from defects in fluid and workmanship on the date of
sale by an authorized Graco distributor to the original purchaser for use. As purchaser ’ s sole remedy for breach of this warranty , Graco
will, for a period of twelve months from the date of sale, repair or replace any part of the equipment proven defective. This warranty
applies only when the equipment is installed, operated and maintained in accordance with Graco’ s written recommendations.
This warranty does not cover , and Graco shall not be liable for , any malfunction, damage or wear caused by faulty installation, misap -
plication,
abrasion, corrosion, inadequate or improper maintenance, negligence, accident, tampering, or substitution of non–Graco
component parts. Nor shall Graco be liable for malfunction, damage or wear caused by the incompatibility with Graco equipment of
structures, accessories, equipment or fluids not supplied by Graco, or the improper design, manufacture, installation, operation or
maintenance of structures, accessories, equipment or fluids not supplied by Graco.
This warranty is conditioned upon the prepaid return of the equipment claimed to be defective to an authorized Graco distributor for
verification of the claim. If the claimed defect is verified, Graco will repair or replace free of charge any defective parts. The equipment
will be returned to the original purchaser transportation prepaid. If inspection of the equipment does not disclose any defect in fluid or
workmanship, repairs will be made at a reasonable charge, which charges may include the costs of parts, labor and transportation.
DISCLAIMERS AND LIMITATIONS
The terms of this warranty constitute purchaser’s sole and exclusive remedy and are in lieu of any other warranties (express or
implied),
including warranty of merchantability or warranty of fitness for a particular purpose , and of any non–contractual liabili -
ties, including product liabilities, based on negligence or strict liability. Every form of liability for direct, special or consequential
damages
or loss is expressly excluded and denied. In no case shall Graco’ s liability exceed the amount of the purchase price. Any
action for breach of warranty must be brought within two (2) years of the date of sale.
EQUIPMENT NOT COVERED BY GRACO WARRANTY
Graco makes no warranty, and disclaims all implied warranties of merchantability and fitness for a particular purpose, with
respect
to accessories, equipment, fluids, or components sold but not manufactured by Graco. These items sold, but not manufac -
tured
by Graco (such as electric motor , switches, hose, etc.) are subject to the warranty , if any , of their manufacturer . Graco will provide
purchaser with reasonable assistance in making any claim for breach of these warranties.
Graco Phone Numbers
TO PLACE AN ORDER , contact your Graco distrib -
utor
, or call this number to identify the distributor
closest to you: 1–800–367–4023 T oll Free
FOR TECHNICAL ASSIST ANCE, service repair
information or assistance regarding the application of
Graco equipment: 1–800–543–0339 T oll Free
Sales Offices: Atlanta, Chicago, Dallas, Detroit, Los Angeles, Mt. Arlington (N.J.)
Foreign Offices: Canada, England, Korea, Switzerland, France, Germany , Hong Kong, Japan
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
PRINTED IN U.S.A. 308–465 September, 1994, Revised November , 1994