Graco 238338 Operation manual

308612

Rev. D

INSTRUCTIONS-PARTS LIST

INSTRUCTIONS

This manual contains important

warnings and information.

READ AND KEEP FOR REFERENCE.

Stainless Steel, Air-Operated

Bead Spray Gun

200 psi (13.8 bar) Maximum Working Pressure

Model 238338, Series A

GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441

Graco Inc. is registered to I.S. EN ISO 9001

05949

2 308612

Table of Contents

Warnings 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operation 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Technical Data 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Graco Phone Number 12. . . . . . . . . . . . . . . . . . . . . . . . . .

Warranty 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Symbols

Warning Symbol

WARNING

This symbol alerts you to the possibility of serious

injury or death if you do not follow the instructions.

Caution Symbol

CAUTION

This symbol alerts you to the possibility of damage to

or destruction of equipment 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.

DDo not point the gun at anyone or at any part of the body.

DDo not put your hand or fingers over the spray tip.

DDo not stop or deflect leaks with your hand, body, glove or rag.

DFollow the Pressure Relief Procedure on page 5 if the spray tip clogs and before cleaning,

checking or servicing the equipment.

DTighten all fluid connections before operating the equipment.

DCheck the hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.

308612

WARNING

INSTRUCTIONS

EQUIPMENT MISUSE HAZARD

Equipment misuse can cause the equipment to rupture or malfunction and result in serious injury.

DThis equipment is for professional use only.

DRead all instruction manuals, tags, and labels before operating the equipment.

DUse the equipment only for its intended purpose. If you are not sure, call your distributor.

DDo not alter or modify this equipment.

DCheck equipment daily. Repair or replace worn or damaged parts immediately.

DDo 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.

DDo not use hoses to pull equipment.

DRoute 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).

DDo not lift pressurized equipment.

DComply with all applicable local, state, and national fire, electrical, and safety regulations.

4 308612

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 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 (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 ground-

ing 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 ac-

cording to local code. Use only metal pails, which

are conductive. Do not place the pail on a non-

conductive surface, such as paper or cardboard,

which interrupts the grounding continuity.

308612

Operation

Pressure Relief Procedure

FLUID INJECTION HAZARD

To reduce the risk of serious bodily inju-

ry, including fluid injection,splashing in

the eyes or on the skin, or injury from

moving parts, always follow this procedure when-

ever you shut off the pump, when checking or serv-

icing any part of the dispensing system, when

installing, cleaning, or changing part of the valve,

and whenever you stop dispensing.

WARNING

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.

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 pres-

sure 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.

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.

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.

6 308612

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)

Nozzle Size Selection

0 5 10 15 20 25 30 35 40 45

1 2 3

ORIFICE DIAMETER

0.203

0.234

0.280

0.344

Glass Bead Tank psi

(bar)

Bead Delivery lb/min (kg/min)

(2.27) (4.54) (6.80) (9.07) (11.3) (13.6) (15.9)

(0.68)

(1.36)

(2.04)

(2.72)

(3.40)

(4.08)

(4.76)

5 0.420

(20.4)(18.2)

308612

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.

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.

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

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.

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).

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. Re-

move 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.

8 308612

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.

308612

Notes

10 308612

Parts

11*

12*

18*

2**

13*

19**

15*

Model 238338

21*

05950A

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