Graco 238338 User manual
Operation
Single Acting and Double Acting Bead Spray Guns for
RoadLazer™RoadPak™Line Striping System
308612K
EN
- For the application of road marking reflective materials -
- For professional use only -
Model: 238338 - Single Acting Bead Spray Gun
Model: 24G979 - Double Acting Bead Spray Gun
200 psi (1.38 MPa, 13.8 bar) Maximum Working Pressure
Important Safety Instructions
Read all warnings and instructions in this
manual. Save these instructions.
Single Acting Bead Spray Gun Double Acting Bead Spray Gun
II 2 G
T5
Warnings
2308612K
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclama-
tion point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks. When
these symbols appear in the body of this manual, refer back to these Warnings. Product-specific hazard symbols and
warnings not covered in this section may appear throughout the body of this manual where applicable.
WARNINGWARNINGWARNING
WARNING
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not operate the unit when fatigued or under the influence of drugs or alcohol.
• Do not exceed the maximum working pressure or temperature rating of the lowest rated system
component. See Technical Data in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data in all
equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information about
your material, request MSDS from distributor or retailer.
• Do not leave the work area while equipment is energized or under pressure. Turn off all equipment
and follow the Pressure Relief Procedure when equipment is not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine
manufacturer’s replacement parts only.
• Do not alter or modify equipment.
• Use equipment only for its intended purpose. Call your distributor for information.
• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.
• Do not kink or over bend hoses or use hoses to pull equipment.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.
PERSONAL PROTECTIVE EQUIPMENT
You must wear appropriate protective equipment when operating, servicing, or when in the operating
area of the equipment to help protect you from serious injury, including eye injury, hearing loss, inhalation
of toxic fumes, and burns. This equipment includes but is not limited to:
• Protective eyewear, and hearing protection.
• Respirators, protective clothing, and gloves as recommended by the fluid and solvent manufacturer.
CALIFORNIA PROPOSITION 65
The engine exhaust from this product contains a chemical known to the State of California to cause
cancer, birth defects or other reproductive harm.
Installation
308612K 3
Installation
Accessories are available from Graco. Be sure all
accessories are properly sized to withstand the pres-
sures 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 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.
Connect Material Line
Grounding
Proper grounding is essential to maintaining a safe sys-
tem.
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 con-
nection 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 non con-
ductive surface, such as paper or cardboard, which
interrupts the grounding continuity.
ti16199b
ti16198b
ti16177b
Single-Acting Gun Double-Acting Gun
ti16200b
Operation
4308612K
Operation
Pressure Relief Procedure
1. Shut off air supply to the bead tank. Relieve pres-
sure from bead tank.
2. Close the master air valve (required with air-pow-
ered pumps).
3. Actuate the dispensing valve to relieve pressure.
4. Leave the drain valve(s) open until you are ready to
dispense again.
If you suspect that the dispensing valve or hose is com-
pletely clogged, or that pressure has not been fully
relieved after following the steps above, very slowly
loosen the hose end coupling and relieve pressure grad-
ually, then loosen completely. Then clear the valve or
hose.
Adjustments
Set the actuating air to at least 50 psi (3.5 bar) for single
acting gun and 80 psi (5.5 bar) for double acting gun,
then start the pump. Set the glass bead supply tank
pressure between 30 psi (2.1 bar) and 75 psi (5.2 bar)
for desired flow rate.
NOTE: Bead delivery will very with each application.
Always test the system for actual delivery and adjust air
pressure or nozzle size as needed.
Application Data
See RoadLazer System manual 3A1214.
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 (kg/l)
column.
c. Value at intersection of MPH (KPH) row and
Pounds Per column is bead delivery in lb/min
(kg/min).
2. Go to Nozzle Size Selection Table and select:
a. Bead Delivery lb/min (kg/min) column deter-
mined by Bead delivery lb/min (kg/min) value.
b. Psi value Glass Bead Tank psi (bar) row.
c. Curve (1, 2, 3 or 4) at intersection of Glass
Bead Tank psi row and Bead Delivery lb/min
(kg/min) column is nozzle size value.
d. Select nozzle size that allows range of adjust-
ment for more or less flow.
NOTE: If dispensing reflective elements for double drop
application, the minimum nozzle size is .280 in. If a
smaller size is used, clogging of the nozzle orifice may
occur.
Operation
308612K 5
Bead Delivery lb/min (kg/min)
Nozzle Size Selection
Speed Bead Coverage in Pounds Per Gallon (kg/l)
MPH KPH 4 (.48) 5 (.60) 6 (.72) 7 (.84) 8 (.96) 9 (1.08)
23.2 2.4 (1.09) 3.0 (1.36) 3.6 (1.63) 4.1 (1.86) 4.7 (2.13) 5.3 (2.40)
34.8 3.6 (1.63) 4.4 (2.0) 5.3 (2.40) 6.2 (2.81) 7.1 (3.22) 8.0 (3.62)
46.4 4.7 (2.13) 5.9 (2.68) 7.1 (3.22) 8.3 (3.76) 9.5 (4.31) 10.7 (4.85)
58.0 5.9 (2.68) 7.4 (3.36) 8.9 (4.04) 10.4 (4.72) 11.9 (5.40) 13.3 (6.03)
69.6 7.1 (3.22) 8.9 (4.04) 10.7 (4.85) 12.4 (5.62) 14.2 (6.44) 16.0 (7.26)
711.2 8.3 (3.76) 10.4 (4.72) 12.4 (5.62) 14.5 (6.58) 16.6 (7.53) 18.7 (8.48)
812.8 9.5 (4.31) 11.9 (5.40) 14.2 (6.44) 16.6 (7.53) 19.0 (8.62) 21.3 (9.66)
914.4 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 16.0 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)
Bead Delivery lb/min (kg/min)
Orifice Diameter:
0.203 0.280
0.234 0.344
0.420
Glass Bead Tank psi (bar)
(4.76) 70
(4.08) 60
(3.40) 50
(2.72) 40
(2.04) 30
(1.36) 20
(0.68) 10
0
5
(2.27)
10
(4.54)
15
(6.80)
20
(9.07)
25
(11.3)
30
(13.6)
35
(15.9)
40
(18.2)
45
(20.4)
0
13
4
2
5
1 3 42 5
Maintenance
6308612K
Maintenance
Clean Dispensing Valve and
System Daily
Clean the outside of the valve by wiping with a soft cloth
dampened with a compatible solvent.
To remove a hardened particle from the orifice, blow air
through the orifice from the front.
Oil Dispensing Valve Daily
Before each use, lubricate with a spray of oil inside the
protection tube (13) to prevent fluid buildup on these
parts. Any buildup could damage the valve packings
(16, 17, 18).
Service
Needle, Seat and Packings
To clean or replace the needle, seat or packings, pro-
ceed as follows:
1. Follow Pressure Relief Procedure on page 4.
2. Remove valve housing:
a. Remove cap and spring.
b. Loosen nut.
c. Pull down housing and needle assembly to
expose needle shaft.
d. Slide needle through air piston to remove.
3. Remove retaining nut.
NOTICE
Never immerse the entire dispensing valve in solvent.
Immersing in solvent removes lubricants and can
damage packings.
ti16188b
ti16182a
ti16179a
ti16180a
ti16192a
ti16184b
Service
308612K 7
4. Remove valve seat and o-ring from valve housing
and remove gun needle.
5. Remove seal nut and o-ring.
6. Clean all parts. Inspect o-rings for signs of wear,
replace as necessary.
7. Lubricate o-ring with one drop of oil. Install o-ring.
8. Install seat nut, o-ring, and gun needle.
9. Install o-ring on valve seat and insert into valve
housing.
10. Install retaining nut.
Air Piston, Spring and Seals
1. Perform Pressure Relief Procedure, page 4.
2. Remove valve housing (step 2, page 6).
3. Pull out piston and spring guide, then clean and
inspect all parts.
Check the piston o-rings carefully. Lubricate all parts
with a light waterproof grease and reassemble the valve
using new parts as necessary.
ti16185a
ti16183a
ti16195a
ti16194a
ti16197a
ti16196a
ti16189a
ti16191a
ti16190b
ti16187a ti17002a
Double Acting Single Acting
Troubleshooting
8308612K
Troubleshooting
NOTE: Check all possible solutions before disassembling the pump.
Problem Cause Solution
Uneven spray pattern Bead pressure too low Increase pressure to bead tank, or adjust
bead pressure regulator
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 with dry
beads
Replacement Parts and Kits (Single Acting Gun)
308612K 9
Replacement Parts and Kits (Single Acting Gun)
Model 238338
ti17001c
Ref. Part Description Qty.
2** 191201 SEAT, valve, .234 1
3 191196 NUT, retaining 1
4 191206 HOUSING, valve 1
5 166847 HOUSING, valve 1
6 25D347 TOOLESS, handle, gun 1
7 191197 CAP, air cylinder 1
8 164739 SPRING 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 inc. hex 1
15* 158486 PACKING, o-ring 1
16 NUT, packing 1
17 SEAL, needle 1
18* 191192 NEEDLE, gun 1
19** 155463 O-RING 1
20 127285 RING, retaining, external 1
21* 238341 NUT, seal (includes 16, 17) 1
22 24J173 BEAD DEFLECTOR,
adjustable (includes 3, 20)
1
* Included in Repair Kit 238340. Order separately.
** RoadLazer ships with 3 Valve Seat and O-Ring
kits listed in the following table.
Parts List
Replacement Parts and Kits (Double Acting Gun)
10 308612K
Replacement Parts and Kits (Double Acting Gun)
Model 24G979
ti16178c
Ref. Part Description Qty.
2** 191201 SEAT, valve 1
3 191196 NUT, retaining 1
4 191206 HOUSING, valve 1
5 166847 HOUSING, valve 1
6 25D347 TOOLESS, handle, gun 1
7 16G708 CAP, cylinder 1
8 16G763 SPRING, compression 1
9 16G169 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 inc. hex 1
15* 158486 PACKING, o-ring 1
16 NUT, packing 1
17 SEAL, needle 1
18* 191192 NEEDLE, gun 1
19** 155463 O-RING 1
20 127285 RING, retaining, external 1
21* 238341 NUT, seal (includes 16, 17) 1
22 24J173 BEAD DEFLECTOR,
adjustable (includes 3, 20)
1
23* C20179 O-RING 1
27 112698 1/8 in. npt male swivel elbow 1
28 114109 1/4 in. npt male swivel elbow 1
* Included in Repair Kit 238340. Order separately.
** RoadLazer ships with 3 Valve Seat and O-Ring
kits listed in the following table
Parts List
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