Graco 238338 User manual

Operation

Single Acting and Double Acting Bead Spray Guns for

RoadLazer™RoadPak™Line Striping System

308612K

- 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

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

(2.27)

(4.54)

(6.80)

(9.07)

(11.3)

(13.6)

(15.9)

(18.2)

(20.4)

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)

* 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)

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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