INSTRUCTIONS-PARTS LIST
308612
This manual contains important
warnings and information.
READ AND KEEP FOR REFERENCE.
INSTRUCTIONS
Stainless Steel, Air-Operated
Bead Spray Gun
200 psi (13.8 bar) Maximum Working Pressure
Model 238338, Series A
Rev. D
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
ECOPYRIGHT 1996, GRACO INC.
Graco Inc. is registered to I.S. EN ISO 9001
05949
Table of Contents
Warnings 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols
Warning Symbol
WARNING
This symbol alerts you to the possibility of serious
injury or death if you do not follow the instructions.
WARNING
PRESSURIZED EQUIPMENT HAZARD
Beads sprayed from the gun, leaks or ruptured components can splash in the eyes and cause serious
injury.
Troubleshooting 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Phone Number 12. . . . . . . . . . . . . . . . . . . . . . . . . .
Warranty 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Caution Symbol
CAUTION
This symbol alerts you to the possibility of damage to
or destruction of equipment if you do not follow the
instructions.
D Do not point the gun at anyone or at any part of the body.
D Do not put your hand or fingers over the spray tip.
D Do not stop or deflect leaks with your hand, body, glove or rag.
D Follow the Pressure Relief Procedure on page 5 if the spray tip clogs and before cleaning,
checking or servicing the equipment.
D Tighten all fluid connections before operating the equipment.
D Check the hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.
2 308612
INSTRUCTIONS
WARNING
EQUIPMENT MISUSE HAZARD
Equipment misuse can cause the equipment to rupture or malfunction 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 not sure, call your distributor.
D Do not alter or modify this equipment.
D Check equipment daily. Repair or replace worn or damaged parts immediately.
D Do not exceed the maximum working pressure of the lowest rated system component. Refer to the
Technical Data on page 12 for the maximum working pressure of this equipment.
D Do not use hoses to pull equipment.
D Route hoses away from traffic areas, sharp edges, moving parts, and hot surfaces. Do not expose
Graco hoses to temperatures above 82_C (180_F) or below –40_C (–40_F).
D Do not lift pressurized equipment.
D Comply with all applicable local, state, and national fire, electrical, and safety regulations.
308612
3
Installation
NOTE: Reference numbers in parentheses in the text
refer to the numbers in the Parts.
Accessories are available from Graco. Be sure all
accessories are properly sized to withstand the pressures in the system.
Mount Valve
Mount the valve on a 0.50 in. (12.7 mm) diameter rod
on a mounting fixture or a dispensing machine. The
bead gun has a clamping set screw (6) for mounting.
Connect the Air Lines
Clean all lines and connections of dirt, burrs, etc. and
blow them out with clean air before connecting them to
the system. Install an air filter in the air supply line to
remove harmful dirt and moisture from the compressed
air.
Grounding
Proper grounding is essential to maintaining a safe
system.
To reduce the risk of static sparking, ground the pump,
bead spray gun, paint spray gun and all other system
equipment.
1. Pump: use a ground wire and clamp.
2. Air compressors and hydraulic power supplies:
follow manufacturer’s recommendations.
3. Air and fluid hoses connected to the pump: use
only grounded hoses with a maximum of 500 feet
(150 m) combined hose length to ensure grounding continuity.
4. Dispensing valve: obtain grounding through connection to a properly grounded fluid hose, frame
and pump.
5. Fluid supply container: according to local code.
6. All solvent pails used when flushing: ground according to local code. Use only metal pails, which
are conductive. Do not place the pail on a nonconductive surface, such as paper or cardboard,
which interrupts the grounding continuity.
4 308612
Operation
Pressure Relief Procedure
WARNING
FLUID INJECTION HAZARD
To reduce the risk of serious bodily injury, including fluid injection,splashing in
the eyes or on the skin, or injury from
moving parts, always follow this procedure whenever you shut off the pump, when checking or servicing any part of the dispensing system, when
installing, cleaning, or changing part of the valve,
and whenever you stop dispensing.
1. Shut off the air supply to the bead tank. Bleed the
bead tank.
2. Close the bleed-type master air valve (required
with air-powered pumps).
3. Actuate the dispensing valve to relieve pressure.
4. Leave the drain valve(s) open until you are ready
to dispense again.
Application Data
See Road Lazer System Manual 308611.
Nozzle Size Selection
Use the Nozzle Size Selection and Bead Delivery
Tables to select the size of nozzle for the travel speed
and bead coverage to be used. These tables are
based on a 15 mil paint application.
1. Go to Bead Delivery (Lb/Min) Table and select:
a. Speed in MPH or KPH row.
b. Bead coverage in Pounds Per Gallon
column.
c. Value at intersection of MPH row and Pounds
Per column is bead delivery in lb/min.
If you suspect that the dispensing valve or hose is
completely clogged, or that pressure has not been fully
relieved after following the steps above, very slowly
loosen the hose end coupling and relieve pressure
gradually, then loosen completely. Now clear the valve
or hose.
Adjustments
Set the actuating air to at least 50 psi (3.5 bar) and
start the pump. Set the glass bead supply tank pressure between 30 psi and 75 psi for desired flow rate.
Note: Bead delivery will vary with each application.
Always test the system for actual delivery and adjust
air pressure or nozzle size as needed.
2. Go to Nozzle Size Selection Table and select:
a. Bead Delivery (lb/min) column determined by
Bead delivery (lb/min) value.
b. Psi value Glass Bead Tank psi row.
c. Curve (1, 2, 3 or 4) at intersection of Glass
Bead Tank psi row and Bead Delivery (lb/min)
column is nozzle size value.
d. Select nozzle size that allows range of adjust-
ment for more or less flow.
308612
5
Operation
Bead Delivery Lb/Min (kg/Min)
Speed Bead Coverage in Pounds Per Gallon (kg/L)
MPH KPH 4 (.48) 5 (.60) 6 (.72) 7 (.84) 8 (.96) 9 (1.08)
2 3.2 2.4 (1.09) 3.0 (1.36) 3.6 (1.63) 4.1 (1.86) 4.7 (2.13) 5.3 (2.40)
3 4.8 3.6 (1.63) 4.4 (2.0) 5.3 (2.40) 6.2 (2.81) 7.1 (3.22) 8.0 (3.62)
4 6.4 4.7 (2.13) 5.9 (2.68) 7.1 (3.22) 8.3 (3.76) 9.5 (4.31) 10.7 (4.85)
5 8 5.9 (2.68) 7.4 (3.36) 8.9 (4.04) 10.4 (4.72) 11.9 (5.40) 13.3 (6.03)
6 9.6 7.1 (3.22) 8.9 (4.04) 10.7 (4.85) 12.4 (5.62) 14.2 (6.44) 16.0 (7.26)
7 11.2 8.3 (3.76) 10.4 (4.72) 12.4 (5.62) 14.5 (6.58) 16.6 (7.53) 18.7 (8.48)
8 12.8 9.5 (4.31) 11.9 (5.40) 14.2 (6.44) 16.6 (7.53) 19.0 (8.62) 21.3 (9.66)
9 14.4 10.7 (4.85) 13.3 (6.03) 16.0 (7.26) 18.7 (8.48) 21.3 (9.66) 24.0 (10.9)
10 16 11.9 (5.40) 14.8 (6.71) 17.8 (8.07) 20.7 (9.39) 23.7 (10.8) 26.7 (12.1)
11 17.6 13.0 (5.90) 16.3 (7.39) 19.6 (8.89) 22.8 (10.3) 26.1 (11.8) 29.3 (13.3)
12 19.2 14.2 (6.44) 17.8 (8.07) 21.3 (9.66) 24.9 (11.3) 28.4 (12.9) 32.0 (14.5)
Glass Bead Tank psi
(4.76)
(4.08)
(3.40)
(bar)
(2.72)
(2.04)
(1.36)
(0.68)
Nozzle Size Selection
70
60
50
40
30
20
10
0
0 5 10 15 20 25 30 35 40 45
(2.27) (4.54) (6.80) (9.07) (11.3) (13.6) (15.9)
ORIFICE DIAMETER
1
0.203
3
0.280
1 2 3
Bead Delivery lb/min (kg/min)
45
(20.4)(18.2)
6 308612
2
0.234
4
0.344
5 0.420
Maintenance
Clean Dispensing Valve and System Daily
CAUTION
Be sure that the solvent you use is compatible with
the fluid being dispensed, to avoid clogging the
valve’s fluid passages.
An important part of the care and maintenance of your
automatic dispensing valve is proper flushing. Flush
the valve daily with a compatible solvent until all traces
of fluid are removed from the valve passages. Follow
the Pressure Relief Procedure on page 5 before
flushing.
Service
Needle, Seat and Packings
To clean or replace the needle (18), its seat (17) or
packings (19 or 15), proceed as follows:
1. Follow Pressure Relief Procedure on page 5
Clean the outside surfaces of the valve by wiping with
a soft cloth dampened with a compatible solvent.
CAUTION
Never immerse the entire dispensing valve in
solvent. Immersing in solvent removes lubricants
and tends to damage packings.
To remove a hardened particle from the orifice, blow
air through the orifice from the front.
10. Install seal nut (21).
11. Install gun needle (18).
12. Install o-ring (19) on valve seat (2) and insert into
valve housing (4).
2. Remove retaining nut (3).
3. Remove valve housing (4).
4. Remove valve seat (2) and o-ring (19) from valve
housing (4). Remove o-ring.
5. Remove gun needle (18).
6. Remove seal nut (21).
7. Remove o-ring (15).
8. Clean all parts.
9. Lubricate o-ring (15) with one drop of oil. Install
o-ring.
13. Install retaining nut (3).
Air Piston, Spring and Seals
Follow the Pressure Relief Procedure on page 5,
then remove the valve as explained, preceding. Remove the air cylinder cap (7), take out the spring (8)
and pull the piston (10) out. Clean and inspect all
parts. Check the piston o-rings (11, 12) carefully.
Lubricate all parts with a light waterproof grease and
reassemble the valve using new parts as necessary.
Repair Kit
Repair Kit 238340 includes the parts listed with an * in
Parts on page 11.
308612
7
Troubleshooting
NOTE: Check all possible solutions before disassembling the pump.
Problem
Uneven spray pattern Bead pressure too low Increase pressure to bead tank, or
Spray gun will not stop spraying Gun needle binding Clean, repair
Obstructed or worn needle seat Clean or replace
Spray gun will not spray Bead line clogged Clear
Bead valve closed Open
Clogged orifice or needle seat Clean
No trigger or actuator air pressure Check, clean air lines
Wet beads Drain beads from tank and replace
Cause Solution
adjust bead pressure regulator
with dry beads.
8 308612
Notes
308612
9
Parts
Model 238338
7
8
9
11*
10
12*
13*
6
14
5
4
15*
16
17
18*
19**
2**
20
3
21*
10 308612
1
05950A
Model 238338
Parts
Ref.
No. Part No. Description Qty.
1 238330 DEFLECTOR 1
2 191201** SEAT, valve 1
3 191196 NUT, retaining 1
4 191206 HOUSING, valve 1
5 166847 HOUSING, valve 1
6 101554 SET SCREW, 3/8–16 x 3/4 in. 1
7 191197 CAP, air cylinder 1
8 164739 SPRING, helical compression 1
9 164740 GUIDE, spring 1
10 164741 PISTON, air 1
11 156593* O-RING; nitrile rubber 1
12 155685* PACKING, O-ring 1
13 191195* TUBE, protection 1
14 102300 NUT, jam, 7/8 in. hex; 9/16–18 nf 1
15 158486* PACKING,O-ring 1
16 NUT, packing 1
17 SEAT, needle 1
18 191192* NEEDLE, gun 1
19 166702** O-RING 1
20 113463 RING, retaining, external 1
21 238341* NUT, seal (Includes 16 and 17) 1
* Included in Repair Kit 238340. Order separately.
** The Road Lazer ships with the three Valve Seat &
O-ring Kits listed in the following table:
Ref.
No. Part No. Description Qty.
Valve Seat & O-ring Kits
Valve Seat
Nozzle Size
0.203 238663
0.234 238666
0.281 238664
0.334 238665
0.420† 243668
† Nozzle size 0.420 is optional; order separately
(Includes O-ring)
Kit
Accessories
Wide Bead Deflector Kit 239695
Allows application of 12 in. wide beaded lines.
308612
11
Technical Data
Graco Phone
Maximum working pressure 200 psi (12 bar). . . . . . . . .
Operating pressure of air actuated trigger
Minimum 50 psi (3 bar). . . . . . . . . . . . . . . . . . . . . . . .
Maximum 200 psi (12 bar). . . . . . . . . . . . . . . . . . . . . .
Air connection 1/4 npt(f) air inlet. . . . . . . . . . . . . . . . . . .
Bead connection 3/4 npt(f) bead inlet. . . . . . . . . . . . . . .
Glass bead output 2 to 40 lb/min (.9 to 18 kg/min). . . .
Air consumption 2 to 7 cfm. . . . . . . . . . . . . . . . . . . . . . . .
Spray width 2 to 12 in (50 to 304 mm). . . . . . . . . . . . . . .
TO PLACE AN ORDER, contact your Graco distributor, or call this number to identify the distributor
closest to you: 1–800–690–2894 Toll Free
Number
Graco Warranty
Graco warrants all equipment manufactured by Graco and bearing its name to be free from defects in material and workmanship on the
date of sale by an authorized Graco distributor to the original purchaser for use. With the exception of any special, extended, or limited
warranty published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment
determined by Graco to be 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 general wear and tear, or any malfunction, damage or wear caused by
faulty installation, misapplication, 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 of
Graco equipment with structures, accessories, equipment or materials not supplied by Graco, or the improper design, manufacture,
installation, operation or maintenance of structures, accessories, equipment or materials 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 claimed defect. 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 material or workmanship, repairs will be made at a reasonable charge, which charges may include the costs of parts, labor, and
transportation.
THIS WARRANTY IS EXCLUSIVE, AND IS IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO WARRANTY OF MERCHANTABILITY OR WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.
Graco’s sole obligation and buyer’s sole remedy for any breach of warranty shall be as set forth above. The buyer agrees that no other
remedy (including, but not limited to, incidental or consequential damages for lost profits, lost sales, injury to person or property, or any
other incidental or consequential loss) shall be available. Any action for breach of warranty must be brought within two (2) years of the
date of sale.
Graco makes no warranty, and disclaims all implied warranties of merchantability and fitness for a particular purpose in connection
with accessories, equipment, materials or components sold but not manufactured by Graco. These items sold, but not manufactured
by Graco (such as electric motors, 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.
In no event will Graco be liable for indirect, incidental, special or consequential damages resulting from Graco supplying equipment
hereunder, or the furnishing, performance, or use of any products or other goods sold hereto, whether due to a breach of contract,
breach of warranty, the negligence of Graco, or otherwise.
FOR GRACO CANADA CUSTOMERS
The parties acknowledge that they have required that the present document, as well as all documents, notices and legal proceedings
entered into, given or instituted pursuant hereto or relating directly or indirectly hereto, be drawn up in English. Les parties reconnaissent avoir convenu que la rédaction du présente document sera en Anglais, ainsi que tous documents, avis et procédures judiciaires
exécutés, donnés ou intentés à la suite de ou en rapport, directement ou indirectement, avec les procedures concernées.
ADDITIONAL WARRANTY COVERAGE
Graco does provide extended warranty and wear warranty for products described in the “Graco Contractor Equipment Warranty
Program”.
All written and visual data contained in this document reflects the latest product information available at the time of publication.
Graco reserves the right to make changes at any time without notice.
12 308612
Sales Offices: Atlanta, Chicago, Detroit
Foreign Offices: Belgium, Korea, Hong Kong, Japan
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
http://www.graco.com
PRINTED IN U.S.A. 308612 March 1996, Revised 02/2000
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