Graco Series A Operation manual

Instructions–Parts List
308206E
ENG
Important Safety Instructions
Read all warnings and instructions in this manual.
Save these instructions.
Pistol–Grip Mastic Flo–Gun
For spraying highly filled texture materials.
4050psi (27.6 MPa, 276 bar) Maximum Working Pressure
Model 224990, Series A; Model 289670
With Diffuser,
Includes RAC X Tip: 224990–LTX535, 289670–HDA535
Model 224991, Series A; Model 289671
Without Diffuser
Includes RAC X Tip: 224991–LTX535, 289671–HDA535
DBoth guns include RAC X tip guard
DBoth guns have 7/8–14 UNF nozzle threads.
DBoth guns include two inlet adapters:
a 1/2 npt to 1/2 npsm(f) straight swivel and
1/2 npt(f) to 3/8 npt(f). Use the appropriate
one for your hose fittings.

2 308206
SAFETY WARNINGS
HIGH PRESSURE SPRAY CAN CAUSE SERIOUS INJURY.
FOR PROFESSIONAL USE ONLY. OBSERVE ALL WARNINGS.
Read and understand all instruction manuals before operating the equipment.
FLUID INJECTION HAZARD
General Safety
This is a high pressure dispensing gun. Fluid dispensed under
high pressure could be injected through your skin and into your
body, and cause extremely serious bodily injury, including the
need for amputation. Also, fluid injected or splashed into the
eyes or on the skin can cause serious damage.
NEVER point the spray gun at any one or at any part of the body.
NEVER put your hand or fingers over the spray tip.
NEVER try to “blow back” paint; this is NOT an air spray system.
ALWAYS have the tip guard in place on the gun when spraying.
NEVER try to stop or deflect leaks with your hand or body.
ALWAYS follow the PRESSURE RELIEF PROCEDURE, be-
low, before cleaning or removing the spray tip or servicing any
system equipment.
Medical Alert––Airless Spray Wounds
If any fluid appears to penetrate your skin, get EMERGENCY
MEDICAL CARE AT ONCE. DO NOT TREAT AS A SIMPLE
CUT. Tell the doctor exactly what fluid was injected.
Note to Physician: Injection in the skin is a traumatic injury.
It is important to treat the injury surgically as soon as possible.
Do not delay treatment to research toxicity. Toxicity is a
concern with some exotic coatings injected directly into the
blood stream. Consultation with a plastic surgeon or re-
constructive hand surgeon may be advisable.
Spray Gun Safety Devices
Be sure all gun safety devices are operating properly before
each use. Do not remove or modify any part of the gun; this can
cause a malfunction and result in serious bodily injury.
Safety Latch
Whenever you stop spraying, even for a moment, always fully
release the trigger. This engages the gun’s safety latch and
makes the gun inoperative. Failure to set the safety latch can re-
sult in accidental triggering of the gun.
Tip Guard
ALWAYS have the tip guard in place on the spray gun while
spraying. The tip guard alerts you to the fluid injection hazard
and helps reduce, but does not prevent, the risk of accidentally
placing your fingers or any part of your body close to the spray
tip.
Trigger Guard
Always have the trigger guard in place on the gun when spray-
ing to reduce the risk of accidentally triggering the gun if it is
dropped or bumped.
Spray Tip Safety
Use extreme caution when cleaning or changing spray tips. If
the spray tip clogs while spraying, engage the gun safety latch
immediately. ALWAYS follow the PRESSURE RELIEF PRO-
CEDURE, below, and then remove the spray tip to clean it.
NEVER wipe off build–up around the spray tip until the pressure
is fully relieved and the gun safety is engaged.
Pressure Relief Procedure
To reduce the risk of serious bodily injury, including fluid
injection, splashing fluid or solvent in the eyes or on the
skin, or injury from moving parts, always follow this proce-
dure whenever you shut off the sprayer, when checking
or servicing any part of the spray system, when installing,
cleaning or changing spray tips, and whenever you stop
spraying.
1. Fully release the gun trigger to set the safety latch.
2. Disconnect the power source.
3. Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the gun to relieve
pressure. Disengage the safety latch by pushing the
latch in as you trigger the gun to relieve fluid pressure.
4. Fully release the gun trigger to set the safety latch.
5. Open the pump’s pressure drain valve to help relieve
fluid pressure in the pump, hose and gun. Triggering
the gun to relieve pressure may not be sufficient. Have
a container ready to catch the drainage.
6. Leave the valve open until you are ready to spray
again.
If you suspect that the spray tip or hose is completely
clogged, or that pressure has not been fully relieved after
following the steps above, VERY SLOWLY loosen the tip
guard retaining nut or hose end coupling to relieve pres-
sure gradually, then loosen completely. Now clear the tip
or hose obstruction.
SAFETY LATCH
MOVING PARTS HAZARD
Moving parts can pinch or amputate your fingers or other body
parts. KEEP CLEAR of moving parts when starting or operating
the sprayer. Follow the Pressure Relief Procedure on page 2
before checking or servicing any part of the sprayer, to prevent
it from starting accidentally.

3308206
EQUIPMENT MISUSE HAZARD
General Safety
Any misuse of the spray equipment or accessories, such as
overpressurizing, modifying parts, using incompatible chemi-
cals and fluids, or using worn or damaged parts, can cause
them to rupture and result in fluid injection, splashing in the eyes
or on the skin, or other serious bodily injury, or fire, explosion or
property damage.
NEVER alter or modify any part of this equipment; doing so
could cause it to malfunction.
CHECK all spray equipment regularly and repair or replace
worn or damaged parts immediately.
Always wear protective eyewear, gloves, clothing and respira-
tor as recommended by the fluid and solvent manufacturer.
System Pressure
DO NOT exceed 4050 psi (276 bar) MAXIMUM WORKING
PRESSURE to the spray gun. Be sure all spray equipment and
accessories used are rated to withstand the this pressure. DO
NOT exceed the maximum working pressure of any component
or accessory used in the system.
Fluid and Solvent Compatibility
All chemicals used in the gun must be chemically compatible
with the wetted parts shown in the TECHNICAL DATA on the
back cover. Consult your chemical supplier to ensure compatibil-
ity.
HOSE SAFETY
High pressure fluid in the hoses can be very dangerous. If the
hose develops a leak, split or rupture due to any kind of wear,
damage or misuse, the high pressure spray emitted from it can
cause a fluid injection injury or other serious bodily injury or
property damage.
TIGHTEN all fluid connections securely before each use. High
pressure fluid can dislodge a loose coupling or allow high pres-
sure spray to be emitted from the coupling.
NEVER use a damaged hose. Before each use, check the en-
tire hose for cuts, leaks, abrasion, bulging cover, or damage or
movement of the hose couplings. If any of these conditions ex-
ist, replace the hose immediately. DO NOT try to recouple high
pressure hose or mend it with tape or any other device. A re-
paired hose cannot contain the high pressure fluid.
HANDLE AND ROUTE HOSES CAREFULLY. Do not pull on
hoses to move equipment. Do not use fluids or solvents which
are not compatible with the inner tube and cover of the hose. DO
NOT expose hose to extreme temperatures; check with your
hose supplier to determine temperature tolerances.
Fluid Hose Grounding Continuity
Proper hose grounding continuity is essential to maintaining a
grounded spray system. Check the electrical resistance of your
fluid hoses at least once a week. If your hose does not have a
tag on it which specifies the maximum electrical resistance,
contact the hose supplier or manufacturer for the maximum re-
sistance limits. Use a resistance meter in the appropriate range
for your hose to check the resistance. If the resistance exceeds
the recommended limits, replace it immediately. An un-
grounded or poorly grounded fluid hose can make your system
hazardous. Also read FIRE OR EXPLOSION HAZARD, below.
FIRE OR EXPLOSION HAZARD
Static electricity is created by the flow of fluid through the pump
and hose. If every part of the spray equipment is not properly
grounded, sparking may occur, and the system may become
hazardous. Sparking may also occur when plugging in or un-
plugging a power supply cord or using a gasoline engine. Sparks
can ignite fumes from solvents and the fluid being sprayed, dust
particles and other flammable substances, whether you are
spraying indoors or outdoors, and can cause a fire or explosion
and serious bodily injury and property damage. Do not plug in
or unplug any power supply cords in the spray area when there
is any chance of igniting fumes still in the air.
If you experience any static sparking or any slight shock while
using this equipment, STOP SPRAYING IMMEDIATELY. Check
the entire system for proper grounding. Do not use the system
again until the problem is identified and corrected.
Grounding
To reduce the risk of static sparking, ground the sprayer and all
other spray equipment used or located in the spray area.
CHECK your local electrical code for detailed grounding instruc-
tions for your area and type of equipment. BE SURE to ground
all of this spray equipment:
1..Pump: connect a ground wire and clamp (supplied) to a true
earth ground, or plug an electric-powered unit into a properly
grounded outlet.
2. Air compressor or hydraulic power supply: ground according
to local code and manufacturer’s recommendations.
3. Fluid hoses: use only grounded hoses with a maximum of
500 ft (150 m) combined hose length to ensure grounding
continuity. See Hose Grounding Continuity above.
4. Spray gun: obtain grounding through connection to a prop-
erly grounded fluid hose and sprayer.
5. Object being sprayed: according to local code.
6. Fluid supply container: according to local code.
7. All solvent pails used when flushing, according to local code.
Use only metal pails, which are conductive. Do not place the
pail on a non–conductive surface, such as paper or card-
board, which interrupts the grounding continuity.
8. To maintain grounding continuity when flushing or relieving
pressure, always hold a metal part of the gun firmly to the side
of a grounded metal pail, then trigger the gun.
Flushing Safety
Reduce the risk of fluid injection injury, static sparking, or
splashing by following the flushing procedure given in your
pump or sprayer manual. Follow the PRESSURE RELIEF
PROCEDURE on page 2, and remove the spray tip before
flushing. Hold a metal part of the gun firmly to the side of a
grounded metal pail and use the lowest possible fluid pressure
during flushing.
Ventilate the Spray Area
To prevent hazardous concentrations of toxic and/or flammable
vapors, spray only in a properly ventilated spray area.
IMPORTANT
United States Government safety standards have been adopted under the Occupational Safety and Health Act. These standards –
particularly the General Standards, Part 1910, and the Construction Standards, Part 1926 – should be consulted.

4 308206
OPERATION
WARNING
To reduce the risk of serious bodily injury, including
fluid injection, splashing in the eyes or on the skin,
or injury from moving parts, always follow the Pres-
sure Relief Procedure on page 2 when checking,
adjusting, servicing or shutting off any part of the
system.
3/16”
(4.76 mm)
Free Play
VENT
SAFETY
LATCH
Solid lines
show latch
engaged
Fig. 1
NOTE: Do not install the spray tip until the system has
been primed. Then, relieve pressure and
engage the safety latch before installing the tip.
Check the trigger “free play” before
operating the gun.
A properly adjusted trigger ensures that the flow of fluid
is stopped completely when the trigger is released.
1. Hold the gun horizontally as shown. With the safety
latch off (see dotted lines), squeeze the trigger just
until you feel resistance. See Fig 1.
2. Allow the trigger to fall forward, which engages the
safety latch (see solid lines). The distance the trigger
moves is the free play, which should be 3/16”. See
Fig 1.
3. If the free play is not 3/16”, see Adjust the trigger
free travel on page 6.
Check for proper spring tension:
See Adjusting the spring tension on page 5.
To engage the gun’s safety latch:
Tip the gun forward and fully release the trigger. See Fig
1.
To disengage the gun’s safety latch:
Push the latch in as you squeeze the trigger. See Fig 1.
To dispense fluid:
Start the supply pump and squeeze the trigger. Fluid flow
begins with the slightest pressure and stops when the
trigger is released.
To adjust the flow rate:
Adjust the pump speed to obtain the desired flow rate; al-
ways use the lowest pressure necessary. The pressure
adjustment will depend on the hose length, the viscosity
of the fluid, and the nozzle size.
Periodically inspect the vent:
Check the vent in the gun handle for build-up of fluid,
which could indicate an internal leak. See Fig 1. Service
the valve stem and packing as needed.
Install the tip guard after priming the pump:
A Heavy Duty Reverse–A–Clean tip guard and tip, and
the instructions for installing them, are included with the
gun. However, a standard tip guard and flat tip may be
used, if needed. Refer to Fig 2 to install these parts.
FLAT TIP
WASHER
TIP
GUARD
Purchase separately
Fig. 2

5308206
SERVICE
NOTE: The numbers in parentheses in the text refer to
reference numbers in the parts drawings and list.
Adjusting the spring tension. See Fig 3.
WARNING
Proper spring tension ensures that the fluid flow
stops when the trigger is released, to reduce the
risk of injury from fluid injection. The spring tension
is factory–set to 4050 psi (276 bar).
Proper spring tension also minimizes operator fa-
tigue by reducing trigger pull.
1. Connect the hose to the gun. Prime the pump with
the material you are spraying. Set the pump at your
normal operating pressure.
2. To set the spring tension at 4050 psi (276 bar): Trig-
ger and release the gun; the gun should shut off. If
the gun does not shut off, turn the adjustment
screw (16) in just until it does, then turn the screw one
more 1/2 turn.
3. Trigger the gun several times to be sure it shuts off
consistently.
Valve needle stem and packing replacement.
See Fig 4.
1. If fluid leaks past the v-block packing (4), the seal
housing (20{) may be loose, or the v-block packing
(4) or valve stem (28) may be worn. Tighten the seal
housing (20).
16
Fig. 3
2. If the gun still leaks, follow the Pressure Relief
Procedure on page 2.
3. Disconnect the hose from the gun. Disassemble the
gun and replace the v-block packing (4) and the cop-
per gasket (9).
CAUTION
When tightening the bushing (19), BE SURE to grip
the gun body (11), NOT the handle (12). This re-
duces the chance of loosening the connections and
damaging the gun.
{20
4
9
{11
27{
28
12
{TORQUE NOTE:
When assembling the valve seat
(27{), seal housing (20{), tube
(17{) to the gun body (11), or inlet
fitting (19) to the tube (17{), torque
the parts to 100 in–lb (11 N.m)
19{
Fig. 4

6 308206
SERVICE
Valve seat and stem replacement
If fluid continues to flow after the trigger is released, the
gun valve may be obstructed or need adjustment. The
valve stem (28) or valve seat (27) may be worn or dam-
aged. See Fig 5. Refer to the following instructions for
adjustment or repair.
Adjusting the trigger free play. See Fig 5.
1. Relieve pressure. See page 2.
2. Disconnect the gun from the hose.
CAUTION
Squeeze the trigger when removing the valve seat
(27). Handle the valve seat and valve stem (28)
carefully to avoid damaging the hard carbide por-
tion of these parts.
3. Squeeze the gun trigger. Remove the valve seat
(27). Let the spring (5) push the valve stem (28) for-
ward and then loosen the nut (1).
4. Remove the actuating pin (21). Turn the adjusting nut
(18) out a couple of turns.
5. Reassemble the gun and check the free play of the
trigger. It should be approximately 3/16 in. (4.76
mm). See Fig 1.
6. Repeat the procedure, turning the adjusting nut (18)
as needed, to obtain the correct free travel.
Inspecting the valve for obstruction or damage.
See Fig 5.
1. Relieve pressure. See page 2.
2. Disconnect the hose from the gun.
CAUTION
Squeeze the trigger when removing the valve seat
(27). Handle the valve seat and valve stem (28)
carefully to avoid damaging the hard carbide por-
tion of these parts.
3. Disassemble the gun.
4. Clean and inspect the parts. Replace any worn or
damaged parts and reassemble the gun.
5. Adjust the trigger free play as instructed to the left.
CAUTION
When tightening the bushing (19), BE SURE to grip
the gun body (11), NOT the handle (12). This re-
duces the chance of loosening the connections and
damaging the gun.
24
22
614
21
2
26
917{719{31
16
12
5
23
18
1
{20
4
9
{11
25
27{
828
3
{TORQUE NOTE:
When assembling the valve seat
(27{), seal housing (20{), tube
(17{) to the gun body (11), or inlet
fitting (19) to the tube (17{), torque
the parts to 100 in–lb (11 N.m)
Fig. 5

7308206
PARTS DRAWING
24
22
613
14
21
2
26
917{719{
32
16
12
5
23
18
1
{20
4
9
{11
30
29
25
27{
828
15
10
3
1/2 npt(m)
1/2(f) x 1/2(f) SWVL
1/2(f) x 3/8(f)
31
PARTS
LIST
Model 224990, Series A, with Diffuser;
Model 224991, Series A, without Diffuser
Model 289670 (HDA535)
Model 289671 (HDA535)
REF
NO. PART NO. DESCRIPTION QTY
REF
NO. PART NO. DESCRIPTION QTY
1 100975 NUT, hex, No. 5–40 1
2 101421† PIN, cotter, 0.062” (1.59 mm) x
0.375” (9.52 mm) 2
3 102232 PIN, spring, 0.094” (2.38 mm) x
0.25” (6.4 mm) 2
4 SEAL 1
102921* V-BLOCK, polyurethane 1
110959† V-BLOCK, fluorocarbon 1
5 102924* SPRING, compression 1
6 102925* PIN, spring 1
7 154771*† O-RING, nitrile rubber 1
8 156766*† GASKET, copper, valve seat 1
9 160079*† GASKET, copper, gun body2
10 111578 RIVET 2
11 168674 BODY, gun 1
12 187336 HANDLE 1
13 187209 GUARD, trigger 1
14 168682 TRIGGER 1
15 187145** PLATE, Warning 1
16 168685* SCREW, spring adjusting 1
17 168686 TUBE, insert 1
18 168687* NUT, adjusting 1
19 187255 NIPPLE, adapter, 1/2 npt(m) 1
20 168689 HOUSING, seal 1
21 187340* PIN 1
22 168691* SPRING, safety 1
23 168692* PIN, pivot 1
24 168693 LATCH, safety 1
25 187774 NUT, jam, 7/8–14 unf 1
26 203953 SCREW, lock 1
27 235005* SEAT, valve (with diffuser),
7/8–14 unf For Model 224990 1
235006* SEAT, valve (without diffuser)
7/8–14 unf For Model 224991 1
28 215224 STEM, valve 1
29 LTX535 SPRAY TIP, 535 size (224990,
224991) 1
HDA535 SPRAY TIP, 535 size (289670,
289671) 1
30 246215 HEAVY–DUTY RAC TIP GUARD 1
31 155865 UNION, adapter, 1/2 npt (f)
x 1/2 npt(f) swivel 1
32 161077 UNION, adapter, 1/2 npt(f) x
3/8 npt(f) 1
*Recommended “tool box” spare parts. Keep on hand to
reduce down time.
**Replacement Warning plates available at no charge.
† Included in PTFE Conversion Packing Kit 223932.

8 308206
ACCESSORIES
Must be purchased separately.
PTFE PACKING CONVERSION KIT 223932
For Gun Model 224990 & 224991. Refer to the Parts
Drawing and List on page 7.
ZEE SWIVEL 207948
6000 psi (415 bar) MAXIMUM WORKING PRESSURE
1/2 npsm(f) x 1/2 npt(m)
STRAIGHT SWIVEL 207947
6000 psi (415 bar) MAXIMUM WORKING PRESSURE
1/2 npsm(f) x 1/2 npt(m)
TECHNICAL DATA
Maximum working pressure 4050 psi (276 bar). . . . . . .
Inlet port size 12/ npt(m). . . . . . . . . . . . . . . . . . . . . . . . . .
Outlet port size 7/8–14 unf. . . . . . . . . . . . . . . . . . . . . . . . .
Wetted parts Steel, Tungsten Carbide,. . . . . . . . . . . . . .
Copper, buna–n, Polyurethane, Stainless Steel
Dimensions
Height 6” (152 mm). . . . . . . . . . . . . . . . . . . . . . . . . . . .
Length 9” (229 mm). . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weight 1.7 lb (.8 kg). . . . . . . . . . . . . . . . . . . . . . . . . . . .

9308206

10 308206
Graco Standard Warranty
Graco warrants all equipment 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. With the exception of any special, extended, or limited
warranty published by Graco, 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 accor-
dance 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 sub-
stitution 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 PURPOSE.
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.
In no event will Graco be liable for indirect, incidental, special or consequential damages resulting from Graco supplying equipment
hereunder, or 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.
FOR GRACO CANADA CUSTOMERS
The parties acknowledge that they have required that the present document, as well as all documents, notices and legal proceedings
entered into, given or instituted pursuant hereto or relating directly or indirectly hereto, be drawn up in English. Les parties reconnais-
sent avoir convenu que la rédaction du présente document sera en Anglais, ainsi que tous documents, avis et procédures judiciaires
exécutés, donnés ou intentés à la suite de ou en rapport, directement ou indirectement, avec les procedures concernées.
Graco Information
For the latest information about Graco products, visit www.graco.com.
TO PLACE AN ORDER, contact your Graco distributor or call 1–800–690–2894 to identify the nearest distributor.
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.
Original instructions. This manual contains English. MM 308206
Graco Headquarters: Minneapolis
International Offices: Belgium, China, Japan, Korea
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
Copyright 1992, Graco Inc. is registered to ISO 9001
www.graco.com
Revised 06/2011