Graco 25A536 User manual

3A4094A

Instructions - Parts

XHT Spray Gun

For spraying viscous materials at elevated temperatures. For professional use only.

Not approved for use in European explosive atmosphere locations.

Part No. 25A536, Series A

Includes an XHD™RAC®Guard and XHT647 SwitchTip™

6500 psi (45 MPa, 450 bar) Maximum Working Pressure

Important Safety Instructions

Read all warnings and instructions in this

manual. Save all instructions.

WLE

2 3A4094A

Contents

Warnings .................................3

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

System Requirements .....................5

Ground the System .......................5

Gun Trigger Lock .........................5

Pressure Relief Procedure .................5

Operation ..............................6

Adjust the Spray Pattern ...................6

Gun Care ..............................7

Flush the Gun ..........................8

Service ...................................9

Disassembly for Repair or Cleaning ..........9

Reassembly ...........................10

Test the Gun After Service ................12

Parts ....................................13

Technical Data ............................15

Graco StandardWarranty ...................16

Graco Information .........................16

Warnings

3A4094A 3

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 or on warning labels, refer back to theseWarnings. Product-specific

hazard symbols and warnings not covered in this section may appear throughout the body of this manual where

applicable.

WARNING

BURN HAZARD

Equipment surfaces and fluid that is heated can become very hot during operation. To avoid severe

burns:

• Do not touch hot fluid or equipment.

SKIN INJECTION HAZARD

High-pressure fluid from gun, hose leaks, or ruptured components will pierce skin.This may look like just

a cut, but it is a serious injury that can result in amputation. Get immediate surgical treatment.

• Do not spray without tip guard and trigger guard installed.

• Engage trigger lock when not spraying.

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

• Do not put your hand over the spray tip.

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

• Follow the Pressure Relief Procedure when you stop spraying and before cleaning, checking, or

servicing equipment.

• Tighten all fluid connections before operating the equipment.

• Check hoses and couplings daily. Replace worn or damaged parts immediately.

FIRE AND EXPLOSION HAZARD

Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent

fire and explosion:

• Use equipment only in well ventilated area.

• Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop

cloths (potential static arc).

• Keep work area free of debris, including solvent, rags and gasoline.

• Do not plug or unplug power cords, or turn power or light switches on or off when flammable fumes

are present.

• Ground all equipment in the work area. See Grounding instructions.

• Use only grounded hoses.

• Hold gun firmly to side of grounded pail when triggering into pail. Do not use pail liners unless they

are antistatic or conductive.

•Stop operation immediately if static sparking occurs or you feel a shock.Do not use equipment

until you identify and correct the problem.

• Keep a working fire extinguisher in the work area.

Warnings

4 3A4094A

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. SeeTechnical 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 manu-

facturer’s replacement parts only.

• Do not alter or modify equipment. Alterations or modifications may void agency approvals and create

safety hazards.

• Make sure all equipment is rated and approved for the environment in which you are using it.

• 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.

RECOIL HAZARD

Gun may recoil when triggered. If you are not standing securely, you could fall and be seriously injured.

TOXIC FLUID OR FUMES HAZARD

Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled, or

swallowed.

• Read MSDSs to know the specific hazards of the fluids you are using.

• Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.

PERSONAL PROTECTIVE EQUIPMENT

Wear appropriate protective equipment when in the work area to help prevent serious injury, including

eye injury, hearing loss, inhalation of toxic fumes, and burns.This protective 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

WARNING

Operation

3A4094A 5

Operation

Keep the wallet-sized warning card provided with this

gun with the operator at all times. The card contains

important treatment information should an injection

injury occur. Additional cards (part no. 222385) are

available at no charge from Graco.

System Requirements

Pressure drain valves are recommended in the system;

they assist in relieving fluid pressure in the displacement

pump, hose and gun in the event that the gun is clogged

and triggering the gun does not relieve all pressure.

Ground the System

Ground the pump and all other equipment used or

located in the spray area. Check your local electrical

code for detailed grounding instructions for your area

and type of equipment. Follow the grounding instruc-

tions provided in your pump or sprayer manual. Ground

the gun through connection to a properly grounded fluid

hose and pump or sprayer.

GunTrigger Lock

1. To engage the gun trigger lock, rotate the lock so it

is perpendicular to the gun body. See FIG.1.

2. To disengage the gun trigger lock, push the lock out

and rotate it so it is parallel with the gun body. See

FIG.1.

Pressure Relief Procedure

Follow the Pressure Relief Procedure whenever

you see this symbol.

1. Engage the gun trigger lock.

2. Shut off power to the pump.

3. Disengage the gun trigger lock.

4. Hold a metal part of the gun firmly to a grounded

metal pail. Trigger the gun to relieve pressure.

5. Engage the gun trigger lock.

6. Open the system drain valve, having a container

ready to catch the drainage. Close the system drain

valve when fully drained.

7. If you suspect that the spray tip or hose is com-

pletely clogged or that pressure has not been fully

relieved after following the previous steps, very

slowly loosen the tip guard retaining nut or hose end

coupling to relieve pressure gradually. Clear the tip

or hose obstruction.

The equipment must be grounded to reduce the risk

of static sparking. Static sparking can cause fumes to

ignite or explode. Grounding provides an escape wire

for the electric current.

This equipment stays pressurized until pressure is

manually relieved.To help prevent serious injury from

pressurized fluid, such as skin injection, splashing

fluid and moving parts, follow the Pressure Relief

Procedure when you stop spraying and before

cleaning, checking, or servicing the equipment.

The material and equipment will be hot! To avoid

burns, wear protective clothing when materials are at

elevated temperatures.

FIG. 1:Trigger Lock Positions

Locked Unlocked ti19265a

Operation

6 3A4094A

Operation

1. Connect a fluid hose (A) to swivel (28). Reinstall

insulating cuff (29). See Fig. 2.

2. With SwitchTip (8) and tip guard (9) removed, start

the pump. Flush the pump according to the instruc-

tions supplied with it. Use the lowest pressure possi-

ble.

3. Prime the system with the material.

4. Relieve pressure.

5. Install the SwitchTip (8) and tip guard (9). See FIG.

6. Start the pump.Trigger the gun onto test paper.

Adjust the fluid pressure until the spray is com-

pletely atomized. Use the lowest pressure neces-

sary to get the desired results. Higher pressure may

not improve the spray pattern and will cause prema-

ture tip and pump wear.

7. If adjusting the pressure does not give a good spray

pattern, relieve pressure and try another tip size.

8. Use a full-open, full-close trigger action. Hold the

gun about 14 in. (350 mm) from and at right angles

to the work surface. Don’t swing the gun in an arc.

Practice to find the best length and speed of stroke.

Adjust the Spray Pattern

1. To adjust the spray pattern direction, relieve pres-

sure. Loosen the tip guard retaining nut (B). Rotate

the tip guard as necessary to achieve a vertical (C)

or horizontal (A) spray pattern. See FIG. 3. Tighten

the nut.

2. The spray tip orifice and spray angle determines the

coverage and size of pattern. When more coverage

is needed, use a larger spray tip rather than increas-

ing fluid pressure.

Heated fluid expands, causing a pressure rise in a

closed system. Relieve pressure before heating up

equipment.

The material and equipment will be hot! To avoid

burns, do not touch hot fluid or equipment. Wear

protective clothing to turn handles/knobs.

To reduce the risk of component rupture, and serious

injury, including fluid injection, do not exceed the

gun’s 6500 psi (45 MPa, 450 bar) maximum working

pressure or the maximum working pressure of lowest

rated component in the system.

FIG.2

WLE

NOTICE

Openings in the tip guard reduce material buildup on

the guard while spraying. Damage to the sharp edges

of the openings causes material to collect in the dam-

aged area. To prevent this, never hang the gun by

the tip guard.

FIG.3

ABC

ti19267a

Operation

3A4094A 7

Gun Care

Cleaning during the day

1. Relieve pressure, page 5.

2. Wait for the equipment/fluid to cool completely.

3. Use a solvent-soaked brush to clean the spray tip.

Clean the front of the tip frequently during the day to

help reduce buildup.

4. Clean the tip and tip guard at the end of each work

day.

If the spray tip clogs while spraying

1. Stop spraying immediately.

2. Lock the gun trigger lock. Rotate the RAC SwitchTip

handle 180°. See Fig. 4.

3. Unlock the gun trigger lock. Trigger the gun into a

pail or onto the ground to remove the clog.

4. Lock the gun trigger lock. Rotate the tip handle back

to the spraying position.

5. If the tip is still clogged:

a. Engage the gun trigger lock.

b. Shut off the sprayer and disconnect the power

source.

c. Open the pressure drain valve to relieve pres-

sure.

d. Clean the spray tip as shown in manual 308644,

supplied with the RAC SwitchTip.

To reduce the risk of fluid injection or splashing in the

eyes or on the skin:

• Do not point gun at anyone or at any part of the

body when cleaning or checking a clogged tip.

Point the gun toward the ground or into a waste

container when checking to see if the spray tip is

cleared.

• Do not try to “blow back” material; this is not an air

spray gun.

• Do not wipe fluid buildup off the gun or spray tip

until pressure is relieved.

The material and equipment will be hot! To avoid

burns, wear protective clothing when materials are at

elevated temperatures.

NOTICE

Never soak the entire gun in solvent. Prolonged

exposure to solvent can ruin the packings.

FIG.4

WLE

Spraying position shown. Rotate tip handle 180° and

trigger gun to clear clog.

Operation

8 3A4094A

Flush the Gun

NOTE: This procedure requires a grounded pail of com-

patible flushing fluid.

1. Relieve pressure, page 5.

2. Wait for the equipment/fluid to cool completely.

3. Remove the tip guard and spray tip. Soak and clean

the parts.

4. Remove the pump intake from the original pail. Put

the pump intake in a grounded pail of compatible

solvent.

5. Start the pump at its lowest pressure.

6. Trigger the gun into the original pail. When flushing

fluid appears, release the trigger.

7. Now trigger the gun into the flushing fluid supply

pail. Circulate the fluid until the system is thoroughly

flushed.

8. After gun is thoroughly flushed, relieve pressure.

To reduce the risk of serious injury, including splashing

fluid in the eyes or on the skin, burns, or static electric

discharge when flushing:

• Be sure the entire system, including flushing pails,

is properly grounded.

• Remove the tip guard and spray tip.

• Maintain metal to metal contact between the gun

and the flushing pail.

• Use the lowest possible pressure.

NOTICE

Always flush the pump and gun before the sprayed

fluid cures.

ti19269a

Service

3A4094A 9

Service

Disassembly for Repair or

Cleaning

NOTE: If replacing only the needle and seat, step 4 and

5 are not required. However, removing them allows you

to clean the gun more thoroughly.

1. Relieve pressure.

2. Wait for the equipment/fluid to cool completely.

3. Remove insulating cuff (29). Disconnect the fluid

hose (A) and swivel (28). Remove the tip guard (9).

Unscrew the spring screw (21) about 1/4 in. (7 mm)

to release spring tension. See FIG.5.

4. Unscrew the valve seat (2a). Remove the

gasket (2b). See FIG.6.

5. Remove one e-clip (26) then push the pin (18) out of

the gun. Remove the screw (13), pivot pin (23), and

trigger (24). See FIG.7.

To reduce the risk of serious injury from burns, fluid

injection or splashing, before servicing the gun:

• Always follow the Pressure Relief Procedure on

page 5.

• Wait for the equipment to cool completely.

FIG.5

WLE

FIG.6

FIG.7

ti19270a

24 26

ti19271a

Service

10 3A4094A

6. Loosen the setscrew (15) then remove the fluid

housing (22) from the gun body (1). See FIG.8.

7. While supporting the spring guide (16) to prevent

bending the needle (2c), loosen the setscrews (17)

then remove the spring guide (16). See FIG.9.

8. Remove the needle (2c). Unscrew the seal

retainer (2d) then remove the seal (2e). See FIG. 10.

9. Clean all parts and cavities thoroughly with a com-

patible flushing fluid. Dry with a rag or compressed

air. Replace any parts that are worn or damaged.

Reassembly

1. Lightly grease the inner cavities of the fluid

housing (22). Install the small seal (2e) so the lips

face into the fluid housing cavity. Install the seal

retainer (2d) and torque to 30-40 in-lb (3.4-4.5 N•m).

See FIG. 11.

2. Lightly grease the small end of the needle (2c) then

guide it into the large end of the fluid housing (22).

See FIG. 12.

FIG.8

FIG.9

FIG.10

15 ti19272a

ti19274a

ti19275a

FIG.11

FIG.12

ti19276a

ti19271a

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