Graco 308742A Delta Spray Air Spray Gun Owner's Manual

INSTRUCTIONS-PARTS LIST

This manual contains important warnings and information.

READ AND KEEP FOR REFERENCE.

First choice when quality counts.

INSTRUCTIONS

308–742

Rev. A

Delta Spray Air Spray Gun

100 psi (0.7 MPa, 7 bar) Maximum Working Fluid Pressure

100 psi (0.7 MPa, 7 bar) Maximum Working Air Pressure

U.S. Patent Pending

7597A 7013A

Table of Contents

Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

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

Selection Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Air Flow Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Typical Installation

Setup

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7

8

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Daily Gun Care, Flushing, and Cleaning . . . . . . . . . . 13

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Service

Parts

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Graco Warranty and Limitation of Liability . . . . . . . . 32

Graco Phone Number . . . . . . . . . . . . . . . . . . . . . . . . . . 32

GRACO INC.

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

http://www.graco.com

COPYRIGHT 1997, GRACO INC.

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

Warning Symbol

WARNING

Symbols

Caution Symbol

This symbol alerts you to the possibility of serious injury or death if you do not follow the instructions.

CAUTION

This symbol alerts you to the possibility of damage to or destruction of equipment if you do not follow the instructions.

WARNING

EQUIPMENT MISUSE HAZARD

INSTRUCTIONS

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 uncertain about usage, call your Graco distributor.

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 Use this equipment only in low pressure, air spray systems.

D

Do not exceed the maximum working pressure of the lowest rated system component. This equipment has a 100 psi (0.7 MPa, 7 bar) maximum working fluid and air pressure.

D Route the hoses away from the traffic areas, sharp edges, moving parts, and hot surfaces. Do not expose Graco hoses to temperatures above 180 _ F (82 _ C) or below –40 _ F (–40 _ C).

D Wear hearing protection when operating this equipment.

D

Use fluids or solvents that are compatible with equipment wetted parts. See the Technical Data section of all equipment manuals. Read the fluid and solvent manufacturer’s warnings.

D

Methylene Chloride with formic or propionic acid is not recommended as a flushing or cleaning solvent with this gun or any other device with nylon or aluminum components as it can damage these parts.

D Comply with all applicable local, state and national fire, electrical and other safety regulations.

2 308–742

WARNING

PRESSURIZED EQUIPMENT HAZARD

Spray from the gun, hose leaks or ruptured components can splash fluid in the eyes or on the skin and cause serious injury.

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

Follow the Pressure Relief Procedure on page 12 when: you are instructed to relieve pressure; stop spraying; clean, check or service the equipment; and install or clean fluid nozzles.

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

Tighten all fluid connections before operating the equipment.

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

Permanently coupled hoses cannot be repaired; replace the entire hose.

FIRE AND EXPLOSION HAZARD

Poor air ventilation, open flames, or sparks can cause a hazardous condition and result in fire or explosion and serious injury.

Provide fresh air ventilation to avoid the buildup of flammable fumes from solvent or the fluid being sprayed.

Extinguish all open flames or pilot lights in the spray area.

Electrically disconnect all equipment in the spray area.

Keep the spray area free of debris, including solvent, rags and gasoline.

Do not turn on or off any light switch in the spray area while operating or if fumes are present.

Do not smoke in the spray area.

Do not operate a gasoline engine in the spray area.

TOXIC FLUID HAZARD

Hazardous fluids or toxic fumes can cause serious injury or death if splashed in the eyes or on the skin, inhaled, or swallowed.

Know the specific hazards of the fluid you are using. Read the fluid manufacturer’s warnings.

Store hazardous fluid in an approved container. Dispose of hazardous fluid according to all local, state and national guidelines.

Dress appropriately for your application. Wear the appropriate protective clothing, gloves, eyewear, and respirator.

308–742 3

Selection Charts

TERMS:

Light Fluid:

Medium Fluid:

Up to 18 seconds with No. 2 Zahn cup (20 centipoise)

19 to 28 seconds with No. 2 Zahn cup (20–64 centipoise)

Heavy Fluid: Greater than 28 seconds with No. 2 Zahn cup (greater than 64 centipoise) --

2.8 Volatile Organic Compounds, High-solid Polyurethanes, Heavy Waterborne Enamels

NOTE: See pages 24–27 for further part number information.

Air Spray Gun Assemblies

Pressure Feed Guns

Gun Assy.

Includes:

Needle/

Nozzle Kit

Part No.

Part No.

Air Cap**

Part No.

Type

Orifice

Size

Pattern

Length

Material Usage:

Viscosity

239–590 192–315 pressure in. (mm)

0.030 (0.762) in. (mm)

15 (381) light

Flow

oz./min. (l/min.)

4–12 (0.12–0.36) 239–540

239–541

239–542

239–543

239–591

239–592

239–593

239–544

239–545

239–594

239–595

239–548* 239–596*

239–549* 239–597*

192–315

192–315

192–315

192–318

192–319

192–315

192–315 pressure pressure pressure pressure pressure pressure pressure

0.042 (1.067)

0.055 (1.397)

0.070 (1.778)

0.086 (2.184)

0.110 (2.790)

0.042 (1.067)

0.055 (1.397)

17 (432)

17 (432)

18 (457)

13 (330)

11 (279)

17 (432)

17 (432) light-medium medium

8–20 (0.24–60)

16–30 (0.48–0.90) mediumheavy heavy

16–35 (0.48–1.05) heavy light-medium

16–40 (0.48–1.20)

16–45 (0.48–1.35)

8–20 (0.24–60) medium 16–30 (0.48–0.90)

Siphon Feed Guns

Gun Assy.

Includes:

Needle/

Nozzle Kit

Part No.

Part No.

Air Cap**

Orifice

Size

Pattern

Length

Material Usage:

Part No.

Type in. (mm)

0.055 (1.397) in. (mm)

10 (254)

Viscosity Flow

oz./min. (l/min.)

4–10 (0.12–0.30) 239–546 239–592 192–317 siphon light

239–547 239–593 192–317 siphon 0.070 (1.778) 10 (254) light-medium 8–12 (0.24–0.36)

* Stainless steel needle/tip

** Large pattern air caps can be replaced with optional air caps for alternate spray patterns. See page 5 for part numbers.

Measured with gun nozzle 10 in. (254 mm) from target surface

4 308–742

Selection Charts

Gravity Feed Guns

Gun Assy.

Includes:

Needle/

Nozzle Kit

Part No.

Part No.

Air Cap**

Orifice

Size

Pattern

Length

{

Material Usage:

Part No.

Type in. (mm)

0.055 (1.397) in. (mm)

9 (229)

Viscosity Flow

oz./min. (l/min.) light-medium 4–10 (0.12–0.30) 239–710 239–592 192–317 gravity

239–711 239–593 192–317 gravity 0.070 (1.778) 9 (229) light-medium 8–12 (0.24–0.36)

* Stainless steel needle/tip

** Large pattern air caps can be replaced with optional air caps for alternate spray patterns. See page 5 for part numbers.

{ Measured with gun nozzle 10 in. (254 mm) from target surface

Air Spray Gun and Siphon Cup Assemblies Selecting the Proper Needle/Nozzle Kit

Includes:

The spray gun’s needle/nozzle kits range in size to provide different fluid flow rates.

Assy. Part No.

Gun Part No.

Cup Part No.

1 qt. (0.95 liter)

239–582 239–551 239–546

239–552 239–547 239–582

Air Spray Gun and Gravity Cup Assemblies

As a general guideline, use the fluid nozzle that will give the required flow with the needle fully triggered at the lowest fluid pressure.

For low flow rates or light viscosity fluid, select the smaller nozzle sizes.

Includes:

Assy. Part No.

Gun Part No.

239–555 239–710

239–556 239–711

Optional Air Spray Air Caps

Cup Part No.

16 oz. (474 cc)

239–714

239–714

Air Cap

Part No.

Pattern Type Pattern

Length { in. (mm)

192–313 small pattern 12 (305)

192–314 medium pattern 14 (356)

192–316 low pressure 14 (356)

{ Measured with gun nozzle 10 in. (254 mm) from surface

For high flow rates or high viscosity fluid, select the larger nozzle sizes.

NOTE:

D To help select the proper needle/nozzle size, a fluid pressure gauge may be connected temporarily to the gun fluid inlet to determine the fluid pressure.

See Accessories, page 28.

D

See page 17 for troubleshooting information.

308–742 5

Air Flow Charts

NOTE: All tests were completed with the 0.055 in. (1.397 mm) nozzle and the pattern adjustment valve fully open.

Standard Large Pattern Air Cap

Part No. 192–315

30

Optional Low Pressure Air Cap

30

Part No. 192–314

25 25

20

15

10

5

0

10 20 30 40 50 60 70 80 90

GUN INLET PRESSURE (psi)

Optional Small Pattern Air Cap

Part No. 192–313

30

25

20

15

10

5

0

10 20 30 40 50 60 70 80 90


Optional Medium Pattern Air Cap

Part No. 192–316

30

25

20

15

10

5

0

10 20 30 40 50 60 70 80 90


20

15

10

5

0

10 20 30 40 50 60 70 80 90


Optional Gravity/Siphon Air Cap

Part No. 192–317

30

25

20

15

10

5

0

10 20 30 40 50 60 70 80 90


6 308–742

Typical Installation

E F G H

A

B

C

KEY

A Delta Spray Gun

See page 4 for gun part numbers.

B Fluid Inlet; 3/8 npsm (R3/8–19)

C Air Swivel Inlet; 1/4 npsm (R1/4–19)

D Air Hose

Recommend 5/16” (7.9 mm) I.D. hose

E Air Shut-off Valve

F Air Regulator

G Air Filter

H Air Supply Line

The Delta Spray air spray gun was designed to produce the highest quality finish with today’s fluids as well as the Low V.O.C. (volatile organic compound) fluids of tomorrow.

This spray gun can spray all coatings or finishes currently being used for automotive, industrial, aerospace, marine, wood, plastic and architectural applications, while easily operating from any paint delivery system, including cups, pressure pots, or remote pumps for production line operation.

The air regulator must have a minimum air flow capacity of 20 scfm at 100 psi (0.7 MPa, 7 bar) air pressure. Refer to the Pressure Drop Charts, page

11.

D

Ventilate the Spray Booth

WARNING

To prevent hazardous concentrations of toxic and/or flammable vapors, spray only in a properly ventilated spray booth.

Do not operate the spray gun unless ventilation fans are operating.

Check and follow all of the National,

State and Local codes regarding air exhaust velocity requirements.

Check and follow all local safety and fire codes.

308–742 7

Setup

1. Connect the Air Line

NOTE:

You must install an air pressure regulator (F) on the gun air line to control air pressure to the gun. See

Fig. 2.

2. Connect the Fluid Hose

NOTE:

Before connecting the fluid line, blow it out with air and flush it with solvent. Use solvent which is compatible with the fluid to be sprayed.

If your regulated air source does not have a filter , install an air filter (G) on the air line to ensure a dry, clean air supply to the gun. Dirt and moisture can ruin the appearance of your finished workpiece.

See Fig. 2.

Install a fluid regulator (L) on the fluid line to control fluid pressure to the gun. See Fig. 4.

Filter the fluid line of coarse particles and sediment to avoid clogging the fluid nozzle and causing finishing defects.

Use a 5/16 inch (7.9 mm) I.D. air hose to minimize excessive pressure drop in the hose. See the

Pressure Drop Chart on page 11.

A. Connect the fluid hose (J) to the gun fluid inlet (B)

3/8–18 npsm [R 3/8–19] compound thread.

If a 1/4 inch (6.35 mm) I.D. air hose is preferred for flexibility, see the Pressure Drop Chart on page 11 to help set the necessary gun air pressure.

A. Connect the air hose (D) to the 1/4 npsm gun air inlet (C).

B

J

C

D

Fig. 1 7014A

B. Connect the other end of the air hose (D) to a regulated air supply line (H).

NOTE: Fig. 2 shows the filter (G) air regulator (F), and air shut-off valve (E) on the air supply line.

H

G F

7015A

Fig. 3

B. Connect the other end of the fluid hose (J) to a regulated fluid supply line (K).

NOTE: Fig. 4 shows the fluid regulator (L) and fluid shut-off valve (M) on the fluid supply line (K).

L

K

M

J

Fig. 2

8 308–742

E D

01990

Fig. 4

7016A

3. Flush the Spray Gun.

Before putting any paint through the spray gun, flush the gun out with a solvent that is compatible with the fluid to be sprayed, using the lowest possible fluid pressure and a grounded metal container.

Setup

6. Adjust the Spray Pattern

WARNING

COMPONENT RUPTURE HAZARD

Do not exceed the 100 psi (0.7 MPa,

7 bar) maximum fluid and air pres-

sure of this gun. Higher pressures can cause parts to rupture and result in serious injury.

Follow these steps to establish the correct fluid flow and air flow:

A. Turn the fluid adjustment knob (8) counterclockwise until no restriction of the trigger movement is felt, then turn out another half turn. When the knob is turned far enough, the trigger should be able to touch the gun handle when the gun is triggered.

7017A Fig. 5

WARNING


To reduce the risk of a serious injury whenever you are instructed to relieve pressure, follow the Pres-

sure Relief Procedure on page 12.

4. Relieve the Pressure.

5. Position the Air Cap

Rotate the air cap as needed to achieve the desired spray pattern direction. To create a round pattern, turn the pattern air off by turning the pattern adjustment knob (13a) fully clockwise. Refer to Fig. 12, page 11.

Fig. 7

8 open

7018A

Vertical Pattern

Horizontal Pattern

Fig. 6

308–742 9

Setup

6. Adjust the Spray Pattern (continued)

B. Adjust the fluid flow using the fluid pressure regulator (L) installed in the gun fluid line. Typical industrial flow rates will vary with regulator pressures from 5 to 30 psi (34 to 210 kPa, 0.3 to

2.1 bar).

NOTE: A larger fluid nozzle at a reduced fluid pressure will maintain the same flow rate, but slow down the fluid stream (velocity). When air is applied, this allows the air to act on the fluid longer and improve the atomization.

D. If further fluid flow restriction is needed at the gun, turn the fluid adjustment knob (8) clockwise to reduce the volume of fluid output by limiting the needle travel.

8

L close

7019A

Fig. 8

C. Hold the gun parallel to the floor and adjust the fluid pressure to yield a 1 to 6 inch (25.4 to 152.4 mm) straight fluid stream before the stream falls off.

1–6 in.

(25.4–152.4 mm) straight fluid stream

Fig. 9

Fluid Velocity of Fluid Nozzles at the Same Flow Rate

0.042

(1.067)

0.055

(1.397)

0.070

(1.778)

0.086

(2.184)

Orifice Size in inches (mm)

Fig. 10

0.110

(2.794)

7020A

7021A

7022A

Fig. 11

CAUTION

Restricting the trigger and fluid needle travel by continuously spraying with the fluid adjustment knob closed (turned clockwise), will cause accelerated abrasive wear on the fluid needle and wear on the trigger/air valve shaft interface.

For the best results, use the gun fluid regulator to adjust the fluid flow or use a different size needle/ nozzle/air cap combination.

NOTE:

If the fluid adjustment knob is turned in all the way the gun will emit only air.

For continuous spraying, turn the fluid adjustment knob (8) counterclockwise until no restriction of the trigger movement is felt. When the knob is turned out far enough, the trigger should be able to touch the gun handle when the gun is triggered. For the typical fluid adjustment knob setting, turn the knob out 1/2 turn more. This setting provides maximum fluid flow and prevents premature wear on the fluid nozzle.

10 308–742

6. Adjust the Spray Pattern (continued)

E. Open the pattern adjustment valve (13a) by turning it fully counterclockwise to achieve a full fan pattern.

13a

Setup

I.

Check the atomization quality again. Increase the gun air supply pressure with the air pressure regulator in 5 psi (34 kPa, 0.3 bar) increments until you obtain the desired atomization.

J.

If after increasing the gun air supply pressure the atomization is still unacceptable, try installing a larger fluid nozzle size to reduce the fluid velocity.

Refer to Fig. 10. Repeat steps 6-E to 6-I until you obtain the desired atomization.

Close

(narrower pattern)

Open

(wider pattern)

Pressure Drop Charts

Expected pressure drops measured using 25 ft.

(7.625 m) long hose with gun triggered.

5/16 inch (7.9 mm) I.D. hose

Recommended hose size to minimize excessive pressure drop.

Fig. 12

7023A

F. Using the air pressure regulator (F), adjust the gun air supply pressure until you have the desired atomization. Use the lowest possible air pressure that will give you this atomization. See the Pres-

sure Drop Charts for regulator setting versus gun inlet pressure comparison.

Air Regulator Pressure

Setting psi (kPa, bar)

19 (132, 1.3)

30 (210, 2.1)

43 (301, 3.0)

55 (379, 3.8)

66 (451, 4.5)

77 (528, 5.2)

89 (612, 6.1)

Gun Inlet Pressure psi (kPa, bar)

10 (70, 0.7)

20 (140, 1.4)

30 (210, 2.1)

40 (280, 2.8)

50 (345, 3.4)

60 (410, 4.1)

70 (480, 4.8)

F

01997

Fig. 13

G. Test the spray pattern and atomization while holding the gun about 8 to 10 inches (200 to 254 mm) from the test piece.

H. If the spray pattern is too wide with the pattern adjustment knob (13a) turned fully counterclockwise, turn the pattern adjustment knob clockwise until you have the desired pattern size.

NOTE: T urning the pattern adjustment knob fully clockwise will produce a round pattern.

1/4 inch (6.3 mm) I.D. hose

This size not recommended due to excessive pressure drop.

Air Regulator Pressure

Setting psi (kPa, bar)

31 (217, 2.2)

49 (342, 3.4)

65 (444, 4.4)

81 (557, 5.6)

95 (654, 6.5)

Gun Inlet Pressure psi (kPa, bar)

10 (70, 0.7)

20 (140, 1.4)

30 (210, 2.1)

40 (280, 2.8)

50 (345, 3.4)

308–742 11

Operation

Pressure Relief Procedure

WARNING


The system pressure must be manually relieved to prevent the system from starting or spraying accidentally. To reduce the risk of an injury from accidental spray from the gun, splashing fluid, or moving parts, follow the Pressure Relief Proce-

dure whenever you: are instructed to relieve the pressure, stop spraying, check or service any of the system equipment, or install or clean the spray nozzle.

1.

Turn off the air and fluid supply to the gun.

2.

Trigger the gun into a grounded metal waste container to relieve air and fluid pressure.

Applying the Fluid

1.

To achieve the best results when applying fluid, keep the gun perpendicular to the surface and maintain a consistent distance of approximately 8 to 10 inches (203 to 254 mm) from the object being sprayed. See Fig. 14.

2.

To obtain an even finish, use smooth, even strokes across the object being sprayed with 50% overlap.

3.

Paint using parallel strokes. This spray gun applies all coatings evenly without cross coating.

Fig. 14

WRONG RIGHT

0793

12 308–742

Daily Gun Care, Flushing, and Cleaning

WARNING




CAUTION

Clean all parts with a non-conductive solvent, compatible with the fluid being sprayed. Conductive solvents can cause the gun to malfunction.

Methylene chloride with formic or propionic acid is not recommended as a flushing or cleaning solvent with this gun as it will damage aluminum and nylon components.

CAUTION

Solvent left in gun air passages could result in a poor quality paint finish. Do not use any cleaning method which may allow solvent into the gun air passages.

Do not point the gun up while cleaning it.

Do not wipe the gun with a cloth soaked in solvent; ring out the excess.

07025A

Do not immerse the gun in solvent.

02027

Do not use metal tools to clean the air cap holes as this may scratch them; scratches can distort the spray pattern.

07024A

General System Maintenance

1.

Relieve the pressure.

2.

Clean the fluid and air line filters daily.

3.

Check for any fluid leakage from the gun and fluid hoses. Tighten fittings or replace equipment as needed.

02055

4.

Flush the gun before changing colors and whenever you are done operating the gun.

308–742 13


WARNING




4.

Point the gun down into a grounded metal container, and flush the gun with solvent until all traces of paint are removed from the gun passages.

1.


2.

Disconnect the fluid supply hose (J) and air supply hose (D) from the gun.

J

D

7026A

Fig. 15

3.

Connect the solvent supply hose (N) to the gun.

Fig. 17

5.

Turn off the solvent supply.

6.

Relieve the pressure. Disconnect the solvent supply.

7.

Disconnect the solvent (N) supply hose from the gun.

7017A

N

Fig. 16

N

7110A Fig. 18

7027A

14 308–742


8.

Remove the air cap retaining ring (15) and air cap

(14).

9.

Trigger the gun while you remove the fluid nozzle

(12) from the gun with the gun tool (28).

12. With the gun pointed down, clean the front of the gun, using the soft-bristle brush and solvent.

12

28

14, 15

7028A

Fig. 19

CAUTION

Trigger the gun whenever you tighten or remove the nozzle. This keeps the needle seat away from the nozzle seating surface and prevents the seat from being damaged.

10. Clean the air cap retaining ring, air cap, and fluid nozzle with solvent.

11. Dip the end of a soft-bristle brush into a compatible solvent. Do not continuously soak the brush’s bristles with solvent and do not use a wire brush.

Fig. 21 7029A

13. Scrub the air cap retaining ring, air cap, and fluid nozzle with the soft-bristle brush. To clean out air cap holes, use a soft implement, such as a toothpick, to avoid damaging critical surfaces. Clean the air cap and fluid nozzle daily, minimum. Some applications require more frequent cleaning. Do not soak the air cap retaining ring in solvent for prolonged periods of time.

Fig. 20 02007

Fig. 22 02011

308–742 15


14. Trigger the gun while you install the fluid nozzle

(12) with the gun tool (28). Tighten the nozzle securely to 125–135 in-lb (14–15 N

S m) to obtain a good seal.

15. Install the air cap retaining ring (15) and air cap (14).

17. After cleaning the gun, lubricate the following parts with lubricant 111–265 daily:

D

Fluid adjustment knob threads

12 1

28

D Trigger pivot pin

14, 15

D

Fluid needle shaft

Lubricate

1

Fig. 23

Torque to 125–135 in-lb (14–15 N S m)

7028A

16. Dampen a soft cloth with solvent and wring-out the excess. Point the gun down and wipe off the outside of the gun.

7030A

Fig. 25

Lubricate

07013A

Fig. 24

16 308–742

Troubleshooting

WARNING


To reduce the risk of a serious injury, follow the Pres-

sure Relief Procedure on page 12 before checking or repairing any part of the gun or system.

PROBLEM

Fluid flow is fluttering while spraying

CAUSE

1.

2.

Fluid nozzle not tight enough

Fluid filter clogged

4.

Fluid adjustment knob not properly set

SOLUTION

1.

Tighten fluid nozzle to 125–135 in-lb (14–15).

3.

Check fluid filter.

5.

Turn the fluid adjustment knob out for less feathering or use a larger size nozzle.

Fluid flow fades while spraying high viscosity fluids

1.

Air hose size is too restricted for higher air flows

1.

Use 5/16 in. (7.9 mm) I.D. air hose.

2.

Fluid pressure too low, causing fluid flow to reduce when gun is elevated

3.

Raise fluid pressure at source or use a smaller fluid nozzle.

Pattern becomes off-set or heavy on ends

Gun fluid pressure is too high with gun triggered

Using a low fluid pressure setting, the fluid flow is too high, making it necessary to restrict needle travel to reduce fluid flow

Fluid system will not operate at low enough fluid pressure [below 10 psi

(70 kPa, 0.7 bar)]

Air cap horn holes plugged or damaged

Using needle/nozzle kit with too small orifice

Using needle/nozzle kit with too large orifice

There is no fluid regulator, or air regulator on pressure pot is not sensitive enough at low pressures

Clean air cap horn holes with nonmetallic item such as a toothpick, or replace air cap.

Use needle/nozzle kit with larger orifice

Use needle/nozzle kit with smaller orifice

Add low pressure fluid regulator, or add more sensitive low pressure air regulator on pressure pot.

308–742 17

Service

Items Needed for Service

Gun Tool – provided

Packing Installation Tool – provided

Adjustable Wrench

Screw Driver

Lubricant part no. 111–265; see Accessories, page

28, to order

Compatible Solvent

Fluid Packings Replacement

WARNING


To reduce the risk of a serious injury, follow the

Pressure Relief Procedure on page 12 before checking or repairing any part of the gun or system.

NOTE:

Order Fluid Packing Kit 239–640. The kit includes the spreader, u-cup, and spacer.

Clean parts with a solvent that is compatible with the parts and the fluid being sprayed.

Lightly lubricate the parts indicated in Fig. 28 with lubricant 111–265.

1.


2.


(14). See Fig. 26.

3.


(12) with the gun tool (28).

CAUTION

Trigger the gun whenever you tighten or remove the nozzle. This keeps the needle seat away from the nozzle seating surface and prevents the seat from being scratched.

Fig. 26

12

28

14, 15

4.

Remove the fluid adjustment knob (21) and fluid spring (23). See Fig. 28.

5.

Pull the fluid needle (13) out the back of the gun.

6.

Remove the screw (11), pin (17), and trigger (10).

7.

Remove the hex nut (9) with the gun tool (28).

8.

Remove the spray housing (2a) and insert (4).

7028A

9.

Unscrew the packing screw (8) from the insert (4).

10. Use the back end of the fluid needle (13) to push the three fluid packings (5) out of the insert (4). Be careful not to damage the needle or insert. Discard the old fluid packings.

11. Check the fluid needle (13) for damage or excessive wear. Replace needle tip or entire needle if necessary.

18 308–742

Service

12. Place the new fluid packings (5) and packing scew

(8) onto the needle (13). See Fig. 27 for the orientation of the parts.

13. Insert the fluid needle (13) into the back of the insert (4) to install the fluid packings (5).

14. Tighten the packing screw (8) until you feel slight resistance, then remove the needle (13).

15. Slide the insert (4) into the spray housing (2a). See

Fig. 28. Align the housing with the slot and lip (A) on the gun and slide the insert into the gun body (1).

16. Secure the insert (4) and spray housing to the gun body (1) with the hex nut (9). Tighten the nut securely to 125–135 in-lb (14–15 N m).

17. Lubricate and install the fluid needle (13).

18. Lubricate the fluid adjustment knob threads (21), and install the fluid spring (23) and adjustment knob.

19. Install the trigger (10). Torque the screw (11) to

10–15 in-lb (1.1–1.7 N m).

2 25c


(12) with the gun tool (28). Torque the nozzle securely to 125–135 in-lb (14–15 N m).

13

Fig. 27

4

5

1

2

3

8

1 Spreader; tapered end down

2 U-cup; lips face up

3

Spacer

15

14

12 3

11 4

3

6

25d

*25b

25a

1

1

16*

26*

13a

13 1

Item 2 includes 2a–2b

Item 13 includes item 13a

Item 25 includes 25a–25d

*2b 2a

Fig. 28

4

A

*5

8

9 3

5

23

24 3

22

20* 6

19 3

21 2

17

10

1

1

2

3

4

5

6

Lightly lubricate

Lightly lubricate threads

Torque to 125–135 in-lb (14–15 N m)

Torque to 10–15 in-lb (1.1–1.7 N m)

U-cup lips face air valve assembly (26)

U-cup lips face away from nut (19/25a)

*Parts included in Repair Kit 239–639

7584A

308–742 19

Service

1.


21. To seat the fluid packings (5), tighten the packing screw (8) until the fluid needle (13) will not move, back the packing screw off 1/4 turn, then tighten the screw until you feel slight resistance of the needle movement.

22. Trigger the gun to test the needle movement. If the needle does not return after the trigger is released or is slow in returning, loosen the packing screw

(8) slightly until the needle returns freely.

23. Install the air cap (14) and air cap retaining ring

(15). Hand-tighten the ring.

24. Make sure the gun fluid packings are sealing properly by spraying solvent at low pressure before fully pressurizing the gun with the fluid to be sprayed.

If the fluid packings leak, tighten the packing screw

(8) slightly and retest until the packings and needle seal completely.

Complete Gun Packing Replacement

2.


(14). See Fig. 26, page 18.

3.


(12) with the gun tool (28).

CAUTION

Trigger the gun whenever you tighten or remove the nozzle. This keeps the needle seat away from the nozzle seating surface and prevents the seat from being scratched.

4.

Remove the fluid adjustment knob (21) and fluid spring (23). See Fig. 28, page 19.

5.

Pull the fluid needle (13) out the back of the gun.

6.

Remove the screw (11), pin (17), and trigger (10).

7.

Remove the hex nut (9) with the gun tool (28).

WARNING


To reduce the risk of a serious injury, follow the

Pressure Relief Procedure on page 12 before checking or repairing any part of the gun or system.

8.

Remove the spray housing (2a) and insert (4).

Remove the o-ring (2b) with a pick and install the new o-ring.

To ease o-ring installation, place the insert (4) into the spray housing (2a) to plug the end. Install one end of the o-ring into the groove in the housing, then press the rest of the o-ring into place.

NOTE:

Gun Repair Kit 239–639 is available. The kit includes an o-ring (2b), fluid packing kit (5), u-cups

(16, 20, 25b), and air valve assembly (26).

Clean parts with a solvent that is compatible with the parts and the fluid being sprayed.

Lightly lubricate the parts indicated in Fig. 28 with lubricant 111–265.

9.

Unscrew the packing screw (8) from the insert (4).

10. Use the back end of the fluid needle (13) to push the three fluid packings (5) out of the insert (4). Be careful not to damage the needle or insert. Discard the old fluid packings.

20 308–742

Service

11. Place the new fluid packings (5) and packing screw (8) onto the needle (13). See Fig. 27, page

19, for the orientation of the parts.

12. Insert the fluid needle (13) into the back of the insert (4) to install the fluid packings (5).

13. Tighten the packing screw (8) until you feel slight resistance, then remove the needle (13).

14. Remove the fluid valve nut (19), air valve spring

(22), and air valve assembly (26). Discard the air valve assembly. See Fig. 28, page 19.

15. Remove the u-cup (16) from the gun body. The threaded end of the needle (13) can be used to push out the u-cup. Be careful not to damage needle or sealing surface. See Fig. 29.

16. Place the new u-cup (16) on the seal installation tool (29), with the u-cup lips facing the tool as shown in Fig. 30.

17. Push the packing (16) into the back of the gun until a definite snap is felt.

18. Remove the u-cup seal (20) from the fluid valve nut

(19). Be careful not to damage the seal surface or the nut’s internal threads.

19. Install the new u-cup seal (20) with the seal installation tool (29); the u-cup lips must face toward the tool as shown in Fig. 31. This will help apply even pressure to the u-cup lips and avoid damaging them.

20. Push the u-cup seal (20) into the fluid valve nut

(19) until a definite snap is felt.

21. Unscrew the fan air valve assembly (25).

Fig. 29

13

1

Fig. 30

U-cup lips face the tool

16 1

22. Remove the retaining ring (25d) and unscrew the fan air valve (25c).

23. Remove the u-cup seals (25b) from the fan air nut

(25a). Be careful not to damage the seal surface or the nut’s internal threads.

24. One at a time, install the new u-cup seals (25b) with the seal installation tool (25a); the u-cup lips must face toward the tool as shown in Fig. 31.

25. Push each u-cup seal (20) into the fan air nut (19) until a definite snap is felt.

1

U-cup lips face the tool

Fig. 31

29

29

20 or 25b 1

19 or 25a

308–742 21

Service

26. Lubricate the fan air valve (25c) threads and install the valve into the nut (25a). Install the retaining ring (25d), then back out the fan air valve as far as the retaining ring allows it to go.

27. Slide the insert (4) into the spray housing (2a), and install them onto the gun body (1). Align the housing with the slot and lip (A) on the gun and tighten it securely. See Fig. 28, page 19.

28. Install the hex nut (9) and tighten it to 125–135 in-lb (14–15 N m).

29. Check the fluid needle (13) for damage or excessive wear. Replace needle tip or entire needle if necessary.

30. Lubricate the outside of the new air valve assembly (26) and place it on the fluid needle (13), against the nut (B). See Fig. 32. This helps align the entrance of the air valve stem into the inside diameter of the u-cup (16) without damaging the u-cup lip.

31. Install the fluid needle (13) and the air valve assembly (26) into the back of the gun.

32. Install the air valve spring (22). Point the gun down to center the spring (22) and tighten the fluid nut

(19) to 125–135 in-lb (14–15 N m).

33. Install the needle spring (23) and fluid control knob

(21).

34. Install the trigger (10). Torque the screw (11) to

10–15 in-lb (1.1–1.7 N m).


(12) with the gun tool (28). Torque the nozzle to

125–135 in-lb (14–15 N m).

36. Install the fan air valve assembly (25). Torque the nut (25a) to 125–135 in-lb (14–15 N m).

37. To seat the fluid packings (5), tighten the packing screw (8) until the fluid needle (13) will not move, back the packing screw off 1/4 turn, then tighten the screw until you feel resistance.

38. Trigger the gun to test the needle movement. If the needle does not return after the trigger is released or is slow in returning, loosen the packing screw

(8) until the needle returns freely.

39. Install the air cap (14) and air cap retaining ring

(15). Hand-tighten the ring.

40. Make sure the gun fluid packings are sealing properly by spraying solvent at low pressure before fully pressurizing the gun with the fluid to be sprayed.

If the fluid packings leak, tighten the packing screw

(8) slightly and retest until the packings and fluid needle seal completely.

Fig. 32

13

26

B

22 308–742

Notes

308–742 23




15

14

12

Parts

25c

11

25a

1

25d

25b

16

26

13a

13

2b 2a

4

5

8

9

23

24

22

20

19

21

17

10

7584A

24 308–742

Parts

Part No. 239–540 to 239–549

Pressure and Siphon Feed Air Spray Gun Assembly

8

9

Ref.

No.

1

Part No.

Description

239–721 BODY, gun

2 239–652 SPRAY HOUSING ASSY.;

Includes items 2a–2b

2a 192–347

S

HOUSING, spray

2b* 114–067 S O-RING, CV75

4 191–849 INSERT, fluid

5* 239–640 KIT, fluid packing; Includes spreader, u-cup, and spacer

192–352 SCREW, packing

192–348 NUT, hex; 1/2–20 UNF

10

11

12 l

13 l

192–271 TRIGGER

203–953 SCREW, trigger lock

NOZZLE, fluid

13a l

14 l

15

S

NEEDLE ASSY.; Includes replaceable item 13a

TIP, needle

AIR CAP

192–276 RING, air cap retaining

16* 188–493 U-CUP

Qty.

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Ref.

No.

17

19

22

23 l

24

Part No.

Description

192–272 PIN, pivot

192–355 NUT, fluid valve

20* 110–453 U-CUP

21 192–266 KNOB, fluid control

114–069 SPRING, air valve

239–655

SPRING, needle

SWIVEL, air

25 239–654 FAN AIR VALVE ASSY.;

Includes items 25a–25d

25a 192–356

S

NUT, fan air

25b* 110–453

S

U-CUP

25c 192–354 S VALVE, fan air

25d 114–068 S RING, retaining

26* 239–656 AIR VALVE ASSY.

28 192–281 TOOL, gun

Qty.

29 192–282 TOOL, packing installation l

See chart for part number .

* These parts are included in Repair Kit 239–639, which may be purchased separately.

1

1

1

1

2

1

1

1

1

1

1

1

1

1

1

Gun

Part No.

Needle/

Nozzle Kit

Includes items 12–13

239–540

239–541

239–542

239–543

239–544

239–545

239–590

239–591

239–592

239–593

239–594

239–595

239–546 239–592

239–547 239–593

239–548** 239–596

239–549** 239–597

Item 12

Nozzle

192–285

192–286

192–287

192–288

192–289

192–290

192–287

192–288

192–286

192–287

Item 13

Needle

Assy.

Includes item 13a

239–643

239–644

239–645

239–646

239–647

239–648

239–645

239–646

239–649

239–650

Item 13a

Needle

Tip

192–304

192–305

192–306

192–307

192–308

192–309

192–306

192–307

192–310

192–311

Item 14

Air Cap

192–315

192–315

192–315

192–315

192–318

192–319

192–317

192–317

192–315

192–315

Item 23

Spring

Orifice

Size in. (mm)

Fluid

Supply

114–072 .030 (.762) Pressure

114–072 .042 (1.067) Pressure

114–072 .055 (1.397) Pressure

114–072 .070 (1.778) Pressure

114–072 .086 (2.184) Pressure

114–072 .110 (2.794) Pressure

114–072 .055 (1.397)

114–072 .070 (1.778)

Siphon

Siphon

110–402 .042 (1.067) Pressure

110–402 .055 (1.397) Pressure

** These guns have a stainless steel needle tip, which is not recommended except for applications where it is necessary.

308–742 25




15

14

12

Parts

25c

11

25a

1

25d

25b

16

26

13a

13

2b 2a

4

5

8

9

23

24

22

20

19

21

17

10

7583A

26 308–742

Parts

Part No. 239–710 and 239–711

Gravity Feed Air Spray Gun Assembly

8

9

Ref.

No.

1

Part No.

Description

239–721 BODY, gun

2 239–798 SPRAY HOUSING ASSY.;

Includes items 2a–2b

2a 192–345

S

HOUSING, spray, gravity

2b* 114–067 S O-RING, CV75

4 191–850 INSERT, fluid, gravity

5* 239–640 KIT, fluid seal; Includes spreader, u-cup, and spacer

192–352 SCREW, packing

192–348 NUT, hex; 1/2–20 UNF

10

11

12

13 l l

13a l

14

192–271

203–953

192–317

TRIGGER

SCREW, trigger lock

NOZZLE, fluid

S

NEEDLE ASSY.; Includes replaceable item 13a

TIP, needle

AIR CAP

15 192–276 RING, air cap retaining

16* 188–493 U-CUP

Qty.

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Ref.

No.

17

19

Part No.

Description

192–272 PIN, pivot

192–355 NUT, fluid valve

20* 110–453 U-CUP

21 192–266 KNOB, fluid control

22

23

114–069 SPRING, air valve

114–072 SPRING, needle

Qty.

24 239–655 SWIVEL, air

25 239–654 FAN AIR VALVE ASSY.;

Includes items 25a–25d

25a 192–356

S

NUT, fan air

25b* 110–453

S

U-CUP

25c 192–354

S

VALVE, fan air

25d 114–068 S RING, retaining

26* 239–656 AIR VALVE ASSY.

28 192–281 TOOL, gun

29 192–282 TOOL, seal installation l

See chart for part number .

* These parts are included in Repair Kit 239–639, which may be purchased separately.

1

1

1

1

1

1

1

1

1

1

1

2

1

1

1

Gun

Part No.

239–710

239–711

Needle/

Nozzle Kit

Includes items

12–13

239–592

239–593

Item 12

Nozzle

192–287

192–288

Item 13

Needle Assy.

Includes item 13a

239–645

239–646

Item 13a

Needle Tip

192–306

192–307

Orifice Size in. (mm)

Fluid Supply

.055 (1.397)

.070 (1.778)

Gravity

Gravity

308–742 27

Accessories

Cleaning Brush 105–749

For use in cleaning gun

Lubricant 111–265

One 4 oz. (113 gram) tube sanitary (non-silicone) lubricant for fluid seals and wear areas.

Air Caps

See page 5.

Air Whip Hose Assembly 239–631

100 psi (0.7 MPa, 7 bar) Maximum Working Pressure

Eases gun movement with increased hose flexibility.

4 ft. (1.22 m) long, 5/16 in. (7.94 mm) I.D., 1/4 npsm(f) swivel, nitrile

Air Hose Assembly


5/16 in. (7.94 mm) I.D., 1/4 npsm(f) swivel, nitrile

Part No.

239–636

239–637

Length

15 ft. (4.58 m)

25 ft. (7.63 m)

Fluid Whip Hose Assembly 239–622


Eases gun movement with increased hose flexibility.

4 ft. (1.22 m) long, 3/16 in. (4.76 mm) I.D.,

3/8 npsm(fbe), nylon with polyurethane cover

Fluid Hose Assembly


3/16 in. (4.76 mm) I.D., 3/8 npsm(fbe), nylon with polyurethane cover

Gravity Cup Kit

For use with gravity feed gun.

Nylon cup, 304 stainless steel 3/8 npsm(f) fluid inlet fitting, fluid filter cartridge included.

Part No.

239–714

239–715

Siphon Cup

304 stainless steel cup.

Part No.

239–582

239–584

Size

16 oz. (474 cc)

8 oz. (237 cc)

Size

1 qt. (0.95 liter)

1 pt. (0.48 liter)

Disposable Polyethylene Cup Liners

Paint and solvent resistant. 40 liners per box.

112–490 1 Quart Cup Size

112–491 2 Quart Cup Size

Part No.

239–633

239–634

Length

15 ft. (4.58 m)

25 ft. (7.63 m)

Air Control Valve 111–543

Install on the gun air inlet to control the air flow to the gun. 1/4 npsm x 1/4–19 BSPT.

7636A

7619A

Gun Air Regulator Assy. 235–119

0–100 psi (0–0.7 MPa, 0–7 bar) air regulator to control air pressure to gun

NOTE: Installing the gun air regulator adds a pressure drop that could limit the air cap pressure.

7614A

Air Spray to HVLP Conversion Kit 239–587

For converting an air spray gun to a HVLP spray gun.

Includes the HVLP fan valve and spray housing. The appropriate needle, HVLP nozzle, and HVLP air cap must be ordered separately.

28 308–742

7.6 in.

(193 mm)

Dimensions

6.7 in.

(170 mm)

7031A

Technical Data

Category

Maximum Working Fluid

Pressure

Maximum Working Air

Pressure

Data

100 psi (0.7 MPa, 7 bar)

100 psi (0.7 MPa, 7 bar)

Fluid and Air Operating

Temperature Range

Weight

Air Inlet

Fluid Inlet

Wetted Parts

32 _ F to 140 _ F (0 _ C to

60 _ C)

17.1 oz. (485 g)

1/4–18 npsm (R1/4–19) compound thread

3/8–18 npsm (R3/8–19) compound thread

304 and 17–4 PH Stainless

Steel, PEEK, Acetal, Ultra High

Molecular Weight Polyethylene

Noise Data*

Sound Pressure

Sound Power

80.8 Db(A)

89.9 Db(A)

* All readings were taken with the gun controls fully open and with 50 psi (345 kPa, 3.4 bar). Sound pressure was tested to CAGI–PNUEROP–1969. Sound power was tested to ISO 3744–1981.

308–742 29

30 308–742

Notes

Notes

308–742 31

Graco Warranty and Limitation of Liability

WARRANTY

Graco warrants all equipment listed in this manual which is 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. 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 PUR-

POSE.

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.

For Sales to Canadian Customers:

Except as expressly stated herein, Graco makes no representations, warranties or conditions, express, implied or collateral, concerning any goods or services sold, and GRACO SHALL NOT BE LIABLE IN ANY MANNER FOR any other representation, warranty or condition of any kind, whether arising by operation of law or otherwise, including but not limited to, WARRANTIES OF

MERCHANTABLE QUALITY OR FITNESS FOR A PARTICULAR PURPOSE.

LIMITATION OF LIABILITY

In no event will Graco be liable for indirect, incidental, special or consequential damages resulting from Graco supplying equipment hereunder, or for 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.

Graco Phone Number

TO PLACE AN ORDER, contact your Graco distributor, or call this number to identify the distributor closest to you:

1–800–367–4023 Toll Free

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.

Sales Offices: Minneapolis, Detroit, Los Angeles

Foreign Offices: Belgium, Canada, England, Korea, France, Germany, Hong Kong, Japan

32 308–742

GRACO INC.

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

http://www.graco.com

PRINTED IN U.S.A. 308–742 August 1997

No results