Graco 237-425 Operation manual

INSTRUCTIONS–P ARTS LIST 308–464
Rev. B
Supersedes A
30:1 PRESIDENT CARBON STEEL, WALL MOUNTED
PRO AA4500 Electrostatic Package
See the Data Sheet, 305–668, for application information.
3000 psi (210 bar) Maximum System Working Pressure
100 psi (6.9 bar) Maximum Air Inlet Pressure
Model 237–425, Series A
This complete package includes a pump,
electrostatic air-assisted airless gun with a size 411 tip
,wall bracket, 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 package. For your safety ,
also read the component manuals supplied with this
package 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



Table of Contents
Symbols 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setup 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ground the system 7. . . . . . . . . . . . . . . . . . . . . . . . . . .
System Component Information 9. . . . . . . . . . . . . . . . . .
Operation 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure relief procedure 10. . . . . . . . . . . . . . . . . . . . .
Flushing 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranty 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Phone Numbers 16. . . . . . . . . . . . . . . . . . . . . . . . .
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
Fluid injected into the skin is a serious injury . The injury might look like just a cut, but it is a seri -
ous injury . Get immediate medical attention.
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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WARNINGWARNING
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 the 3000 psi (210 bar) maximum working pressure at 100 psi (6.9 bar) maxi -
mum incoming air pressure of 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.
D Do not touch the heater during operation; it is very hot.
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 .

5
308-464
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
(14) is supplied with the package. When the
bleed–type master air valve is closed and the
pump air regulator (8a) is opened, the valve
relieves all air pressure to the system.
4. Have a grounded, metal 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
Fig. 1
5
D
30
1
3,4
04103
E
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
3 Electrostatic Air-assisted airless
spray gun
4 Spray tip
5 Fluid filter
6 Gun fluid hose
7 Gun air hose
8a Pump air regulator
8b Gun air regulator
14 Bleed–type air valve
30 Pump ground wire
8b
8a
14
6
7
AB
C


Setup
III. Unpack the system.
1. In addition to the assembled components, the air
and fluid hoses, gun and instruction manuals are
packaged separately in the main shipping con -
tainer
. These are the manuals you should receive:
306–981 30:1 ratio President pump
308–294 Electrostatic air spray gun
307–273 Fluid filter
308–167 Air regulator
308–861 Ball valve
2. Mount the gun mounting bracket on the wall. See
the gun manual 308–294. Use this bracket to hold
the gun nozzle downward when not in use. See
Fig. 8, page 8.
IV. Setup the system.
1. Be sure the wall where you plan to mount the wall
bracket can support the weight of the system and
the stress caused during pump operation.
2. Remove the paper backing from the mounting
template, supplied. Apply the template to the wall,
4 to 5 feet (1.2 to 1.6 m) above the floor . Drill the
holes. The bolt holes are 0.48 inches (12 mm) in
diameter . Remove the template. Mount the pump
securely.
3.
Thread the swivel elbow (20) onto the pump intake
valve. T ighten securely . See Fig. 2.
Fig. 2
20
V. Connect the hoses and gun to the
system. See Fig. 1 .
1.
Connect the blue fluid hose (6) between the fluid
filter and the fluid inlet of the spray gun (3). These
are 1/4–18 npsm(f) swivel fittings.
2. Connect the special electrostatic air hose (7) be -
tween the gun air regulator (8b) and the air inlet of
the spray gun (3). The gun and air hose have left
hand threads.
3. 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
4. V
erify that all fittings throughout the system are
tightened securely .

7
308-464
Setup
VI. 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 (30) is already
connected to the air motor grounding lug. Connect
the clamp end of the ground wire to a true earth
ground.
2.
Air and fluid hoses : use only electrically conductive
hoses with a maximum of 500 feet (150 m) com -
bined hose length to ensure grounding continuity .
3.
Air compressor : according to manufacturer ’ s
recommendations.
4.
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
5. 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.
6. All electrically conductive objects or devices in the
spray area, including paint containers, wash cans.
7. 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
1
1
8. 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 .
9.
Flammable liquids in the spray area must be kept
in approved, grounded containers. Do not store
more than the quantity needed for one shift.
10. Fluid supply container: according to local code.
11. 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
VII. How to use the air–assisted airless
electrostatic spray gun. See Fig. 6.
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 the gun holder bracket (F),
supplied, with the nozzle pointing down. See Fig. 8.
This prevents solvent from running into the gun air
passages. 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
C

9
308-464
System Component Information
VIII. How to adjust the air regulators.
See Fig. 9.
As you look at the system, the air regulator (8a) on the
left regulates air to the gun and the air regulator (8b)
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.

Fig. 9
8a 8b
CW
CCW

10 308-464
Operation
I. Pressure relief procedure
The system remains pressurized until pressure is
manually relieved. To reduce the risk of serious
injury , including skin injection from pressurized fluid
or accidental spray from the gun, or injury due to
splashing fluid in the eyes or on the skin, follow this
procedure whenever you:
D are told to relieve pressure;
D stop spraying;
D check or service any system equipment;
D install, clean or change spray tips.
WARNING
1. Lock the gun trigger safety .
2. T
urn the ES On/Of f valve lever to OFF .
3.
Close the bleed-type master air valves (A,14).
4. Close the air regulators (8a,8b).
5. Unlock the gun trigger safety .
6.
Hold the gun firmly against a grounded metal
waste pail. T rigger the gun to relieve pressure.
7. Lock the gun trigger safety .
8.
Open the filter drain valve (26), having a container
ready to catch the drainage. Close the drain valve.
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 retaining nut or hose end cou -
pling 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 13.
III. Prime the system.
See Fig. 10.
1. Remove the air cap and spray tip from the gun.
2. Close the filter drain valve (26).
3. Put the suction tube into the fluid supply container.
Screw
the bung adapter (35) into the drum. Position
the suction tube 1/2” (13 mm) off the bottom of the
drum. T
ighten the thumbscrew (31).
4. Make sure the air regulators (8a,8b) are closed.
5. Open the master air valves (A,14).
NOTE: In the next steps, the pump will cycle quickly
until air is purged.
6. Slowly turn on the pump air regulator (8a) until the
pump cycles slowly .
7.
Hold the gun firmly against and aimed into the
grounded metal waste pail. T rigger the gun while
increasing pressure at the pump air regulator (8a)
just enough to purge the air and storage solvent
from the system. When new fluid comes from the
gun, release the trigger . Lock the gun trigger
safety.
Fig. 10 04103
KEY
A Bleed-type master air valve
3 Electrostatic Air-assisted airless spray gun
8a Pump air regulator
8b Gun air regulator
14 Bleed–type air valve
26 Filter drain valve
26
38b
8a
14
A

11
308-464
Operation
IV. 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 the
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. Retest the spray pattern. T rigger the gun and
adjust the gun’ s air control valve (C) to add air to
the aircap and to eliminate stripes or spots. If there
are no stripes or spots, you are ready to start
spraying.
6.
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 (6.9 bar) and try
again. Continue to raise the fluid pressure in
100 psi (6.9 bar) increments until the pattern is full
and clean. Do not exceed 100 psi (6.9 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 30 psi (2.1 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 (6.9 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 .
Fig. 11
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
7. Turn
the ES On/Of f lever (B) to ON. See Fig. 1 1.
NOTE: When spraying, the ES indicator light (A) will
glow , indicating the electrostatic charge. See Fig. 1 1.

12 308-464
Operation
8. Hold the gun tip (electrode) (D) 10 to 12 in. (250 to
300 mm) from the grounded part and trigger the
gun. Operate the gun like a conventional spray
gun, but use a slower stroke to allow the electros -
tatics to work properly .
9.
When the ES On/Of f lever is turned on and you
trigger the gun, be sure there is a grounded work
piece 10 to 12 in. (250 to 300 mm) in front of the
gun.
WARNING
Never trigger the gun without a grounded work
piece in front of the gun. If your 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.
10. Use the gun air control valve to adjust the degree
of atomization. Always use the lowest air pressure
possible for the most ef ficiency.
Using the air control valve may af fect the pattern
size slightly . Use it primarily to improve atomization
and pattern.
11. 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 will lose some electrostatic
wrap ef ficiency.
V. You are now ready for production
spraying.
CAUTION
When using catalyzed fluids, observe the pot life
as recommended by the fluid manufacturer . Always
flush the system before the pot life has expired to
prevent dried fluid which may be dif ficult to clean
out and may damage the system.
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.

13
308-464
Flushing
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.
See Fig. 12.
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 the gun ES On/Of f valve lever to OFF .
2.
Relieve pressure. See page 10.
3. Remove the spray tip and air cap.
4. Unscrew the fluid filter (5) bowl. Remove the
screen. See manual 307–273. Reinstall the bowl
without the screen.
5. Put the suction tube into a grounded metal pail with
about 1/2 gallon (2 liters) of a compatible solvent.
6. Make sure the air regulators (8a,8b) are closed.
NOTE: The gun air regulator (8b) always stays closed
during flushing.
7. Open the master air valves (A,14).
8. Slowly turn on the pump air regulator (8a) until the
pump cycles slowly .
9.
Hold the gun firmly against the grounded metal
waste pail. T rigger the gun. Slowly increase the
pump air regulator setting until the fluid flows
freely . (Some air will spit from the gun until the fluid
arrives.)
10.
Keeping the gun triggered, decrease the pump air
regulator (8a) pressure as much as possible
without stalling the pump, and pump out the
solvent until air comes through the gun.
11. Repeat the procedure with clean solvent, if needed.
12. Release the trigger and lock the gun trigger safety .
13.
Close the master air valves (A,14). Fully close the
pump air regulator (8a).
14. Open the drain valve (26), having a container
ready to catch the drainage.
15. Remove the suction hose from the solvent and
place it in an empty container
.
16.
Clean the filter screen, air cap and spray tip sepa -
rately
. Reinstall the filter screen.
17. Thoroughly clean the inside and outside of the
suction tube .
Fig. 12 04103
26
38b
8a
14
A
KEY
A Bleed-type
master air valve
3 Electrostatic Air-assisted airless
spray gun
5 Fluid filter
8a Pump air regulator
8b Gun air regulator
14 Bleed–type air valve
26 Filter drain valve
5

14 308-464
Parts
Model 237–425, Series A
Includes items 1 to 44
Ref
No.
Part No. Description Qty Ref No. Part No. Description Qty
1 223–586
PRESIDENT PUMP
See 306–981 for parts 1
2 186–727 WALL
MOUNTING BRACKET 1
3 236–030 ELECTROSTATIC
AIR–ASSISTED
AIRLESS SPRA Y GUN
See manual 307–912 for parts 1
4 GG3–411 FLUID
TIP 1
5 218–029
FLUID FIL TER
See 307–273 for parts 1
6 214–698 FLUID
HOSE, cpld 1/4 npsm (fbe)
3/16” ID x 25’ (4.8 mm ID x 7.6 m) 1
7 237–570 AIR
HOSE , electrically conductive
cpld 1/4–18 npsm,
5/16” ID x 25 ft. (7.9 mm ID x 7.6 m) 1
8 104–267 AIR
REGULA TOR
0–125 psi (0–9 bar) range
See 308–167 for part s2
9 101–180 AIR
PRESSURE GAUGE
0–200 psi (0–14 bar) 2
10 155–470 90_
SWIVEL ADAPTER UNION,
1/2 npt(m) x 1/2 npsm(f) swivel 1
11 218–093 AIR
H OSE , buna-S, cpl d 1 / 2 n pt(mbe ),
1/2” ID x 22” (13 mm ID x 559 mm) 1
12 222–297 45_
SWIVEL ADAPTER UNION,
1/2 npt(m) x 1/2 npsm(f) swivel 1
13 158–491 NIPPLE,
1/2 npt, 1.625” (41 mm) long 1
14 107–142 BLEED–TYPE
AIR V ALVE,
1/2 npt (f) 1
15 102–814 FLUID
PRESSURE GAUGE 1
16 166–999 ELBOW
, reducing street,
1/2 npt(m) x 1/4 npt(f) 1
17 162–453 NIPPLE,
1/4 npt x 1/4 npsm 2
18 214–961 SUCTION
HOSE, 3/4 npt(mbe),
3/4” ID x 6’ (19 mm ID x 1.82 m) 1
19 156–591 ELBOW,
3/4 npt (f) 1
20 156–589 90_ SWIVEL
A DAPTER , fluid i ntake,
3/4 npt(f) x 3/4 npt(f) swivel 1
21 100–016 LOCKWASHER,
1/4” spring 2
22 100–270 CAPSCREW
, hex hd,
1/4–20 x 5/8” (16 mm) long 2
23 235–208 SWIVEL
UNION,
3/8 npt(m) x 3/8 npsm(f) 1
24 206–994 THROAT
SEAL LIQUID, 8 oz.1
25 156–849 NIPPLE,
3/8 npt x 3/8–18.6 sf 1
26 210–658 BALL
V AL VE, 3/8 npt (mbe),
see 306–861 for parts 1
27 156–877 NIPPLE,
1/2 npt, 2.5” (63.5 mm) 3
28 188–595 PUMP
MOUNTING PLA TE 1
29 102–254 SCREW,
hex hd, 1/4–20 x
7/8” (22 mm) long 2
30 237–569 GROUND
WIRE and CLAMP
12 gauge (1.5 mm
2
), 25’ (7.6 m) 1
31 100–220 THUMBSCREW,
5/16–18 unc,
1” (25 mm) long 1
33 100–509 PLUG,
1/4 npt sq hd pipe 3
34 179–749 AIR
MANIFOLD , 1/2 npt inlet,
two 1/2 npt outlets 1
35 156–684 BUNG
ADAPTER 1
36 156–592
SUCTION TUBE 1
38 159–100
BALL ST OP 1
39 159–101 INT
AKE V AL VE HOUSING 1
40 161–377 FIL
TER SCREEN 1
41 156–593
O–RING P ACKING 1
42 290–037
MOUNTING TEMPLA TE
(not shown) 1
43 157–416 90_
SWIVEL UNION 1
44 150–286 ADAPTER 1
Manual Change
Summary
This manual was updated to correct the parts drawing
on page 15. The following parts lists changes were
also made.
Assembly
Changed Part Status Ref No. Part No. Name
237–425
Package Old New 6 6236–074 214–698 Hose Hose
Delete (1)
Add (1)
Add (1)
10
27
33
155–470
156–877
100–509
Union
Nipple
Plug



Parts
1
11
27
221
18
19
20
5
15
23 25
44
34
8
9
810
14
27
27
33
29
12
13
3
6
7
28
31
16
17
9
33
22
30
04104
33
17
Ä
Ä
41
35
36
38
40
39
Model 237–425, Series A
Includes items 1 to 44
43
26
4

16 308-464
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.
. . . . . . . . . . . . . . . . . . . . . . .
Wetted Parts
Pump carbon steel, 304/316/420/17–4 pH stainless steel, . . . . . . . . . . . .
chrome, chrome and zinc plating,
tungsten carbide, PTFE, leather 
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid hose nylon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTE: all 304, 316 and 17–4 pH SST are electropolished and/or passivated.
Delrin   is a registered trademark of 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. 308–464 September, 1994, Revised November , 1994