Graco 25A536 User manual

3A4094A
EN
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.
2.
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
A
98
28
A
29
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
9
21
A
28
29
FIG.6
FIG.7
2b
2a
ti19270a
18
13
24 26
23
ti19271a
26

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
1
22
15 ti19272a
17
16
ti19274a
2c
2d
2e
2c
ti19275a
FIG.11
FIG.12
2d
2e
22
ti19276a
2c
22
ti19271a