Graco 288048 Parts list manual

311053E
Instructions - Parts
Automatic Airless
Spray Guns
Part No. 288048
For airless spraying of paints and coatings.
Part No. 288554
For sealant streaming applications.
4000 psi (28 MPa, 280 bar) Maximum Working Fluid Pressure
Mounting manifolds must be ordered separately. Refer to Parts section.
Important Safety Instructions
Read all warnings and instructions in this manual.
Save these instructions.
TI8089a
Model 288048 Shown
II2GcT6

Related Manuals
2311053E
Contents
RelatedManuals ...........................2
Warnings .................................3
Installation ................................5
Ventilate Spray Booth .....................5
Configure Gun and Manifold ................5
Install Air Fittings .........................6
Ground System ..........................6
Mount Gun .............................7
Setup.....................................8
Air Line and Accessory Recommendations ....8
Fluid Line and Accessory Recommendations . . . 8
FlushSprayGun ........................10
InstallSprayTip ........................10
AdjustSprayPattern .....................10
Adjust a Streaming Tip ...................10
Operation ................................11
Pressure Relief Procedure ................11
Apply the Fluid .........................11
DailyGunCare............................12
General System Maintenance ..............13
Daily Cleaning Procedure .................13
Daily Flushing Procedure .................13
Troubleshooting ...........................14
General Troubleshooting ..................14
Spray Pattern Troubleshooting .............16
Service ..................................17
Disassembly ...........................17
Reassembly ............................19
Parts ....................................20
GG0SeriesTipSelectionCharts .............24
Sealer Application Tip and Air Cap
Selection Charts ...........................25
ShowerTip ............................25
Streaming Tips .........................25
Single Orifice Fan Pattern Spray Tips ........25
Accessories ..............................26
Dimensions ...............................27
Mounting Hole Layout ......................28
TechnicalData ............................29
Graco Standard Warranty ...................30
GracoInformation .........................30
Related Manuals
The Automatic Airless Spray Guns manual is available in the following languages. See the following chart for specific
language and part number.
Manual Language
311053 English
311665 Chinese
311666 Danish
311667 Dutch
311668 Finnish
311669 French
311670 German
311671 Italian
311672 Japanese
311673 Korean
311674 Norwegian
311675 Polish
311676 Russian
311677 Spanish
311678 Swedish
Manual Language

Warnings
311053E 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 symbol refers to procedure-specific risk. Refer back
to these warnings. Additional, product-specific warnings may be found throughout the body of this manual where
applicable.
WARNING
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. See Technical 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 forms from distributor or retailer.
• 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.
• 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.
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 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 Pressure Relief Procedure in this manual, when you stop spraying and before cleaning,
checking, or servicing equipment.
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.
• If there is static sparking or you feel a shock, stop operation immediately. Do not use equipment
until you identify and correct the problem.
• Keep a working fire extinguisher in the work area.

Warnings
4311053E
PRESSURIZED EQUIPMENT HAZARD
Fluid from the gun/dispense valve, leaks, or ruptured components can splash in the eyes or on skin and
cause serious injury.
• Follow Pressure Relief Procedure in this manual, when you stop spraying and before cleaning,
checking, or servicing equipment.
• Tighten all fluid connections before operating the equipment.
• Check hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.
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 MSDS’s 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
You must wear appropriate protective equipment when operating, servicing, or when in the operating
area of the equipment to help protect you from serious injury, including eye injury, inhalation of toxic
fumes, burns, and hearing loss. This equipment includes but is not limited to:
• Protective eyewear
• Clothing and respirator as recommended by the fluid and solvent manufacturer
• Gloves
• Hearing protection
WARNING

Installation
311053E 5
Installation
Ventilate Spray Booth
Configure Gun and Manifold
(Order manifold separately. See Accessories, page
26.)
Manifolds 241161 and 241162
The gun is supplied with an internal fluid plug (4). See
FIG. 1. To use the gun in a circulating system, remove
the internal plug. In a non-circulating system, leave the
plug in place to minimize flush time.
Circulating System
1. Apply anti-seize lubricant 222955 to the threads and
mating faces of the manifold (102) and the elbows
(107), supplied unassembled.
2. Install the elbows (107) in both fluid ports of the
manifold (102).
3. Connect the fluid supply line to one elbow and the
fluid return line to the other. The manifold fluid ports
are reversible.
Non-circulating System:
1. Apply anti-seize lubricant 222955 to the threads and
mating faces of manifold (102), plug (109), and
elbow (107), supplied unassembled.
2. Install an elbow (107) in one fluid port of the mani-
fold (102), and a plug (109) in the other port.
3. Install the internal plug (4) in the gun fluid port on
the same side as the manifold plug.
4. Connect the fluid supply line to the manifold elbow
(107). See FIG.1.
5. Install the gun on the manifold, using the four
screws (14). Start the threads of all four screws, and
tighten the front two screws first, and then tighten
the back two screws to 65 in-lb (7.3 N•m).
Check and follow all National, State, and Local
codes regarding air exhaust velocity requirements.
Check and follow all local safety and fire codes.
FIG. 1: Non-Circulating Setup (Cutaway View)
TI8587b
1
Remove when used in circulating systems.
1
Replace with an elbow (107) when used in circulating
systems.
2
2
102
107
109
4
6
5

Installation
6311053E
Install Air Fittings
1. Install 1/4 in. tube fitting into the cylinder (CYL) air
port.
2. Install plugs into the atomization (ATOM) air port
and the fan (FAN) air port.
Ground System
The following grounding instructions are minimum
requirements for a system. Your system may include
other equipment or objects that must be grounded.
Check your local electrical code for detailed grounding
instructions for your area and type of equipment. Your
system must be connected to a true earth ground.
Ground Pump
Ground the pump by connecting a ground wire and
clamp between the fluid supply and a true earth ground
as instructed in your separate pump instruction manual.
Ground Air Compressors and Hydraulic
Power Supplies
Ground them according to the manufacturer recommen-
dations.
Ground Air, Fluid, and Hydraulic Hoses
Connected to Pump
Use only electrically conductive hoses with a maximum
of 100 ft (30.5 m) combined hose length to ensure
grounding continuity. Check the electrical resistance of
your air and fluid hoses at least once a week. If the total
resistance to ground exceeds 25 megohms, replace the
hose immediately.
Ground Spray Gun
Ground the spray gun by connecting it to a properly
grounded fluid hose and pump.
Ground Fluid Supply Container
Ground the fluid supply container according to local
code.
Ground Object Being Sprayed
Ground the object being sprayed according to local
code.
Ground Solvent Pails
Ground all solvent pails that are used with 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 cardboard, which interrupts
the grounding continuity.
FIG. 2: Air Fittings
CYL
ATOM
FAN TI8225a
Use a meter that is capable of measuring resis-
tance at this level.

Installation
311053E 7
Mount Gun
Reciprocating Arm Rod Mount
Manifolds 241161 and 241162
To mount the gun on a reciprocating arm rod [0.5 in. (13
mm) diameter maximum]:
1. Insert the mounting bar (A) through the hole in the
manifold as shown in FIG.3.
2. Secure the gun to the bar by tightening the mount-
ing screw (B).
3. Ensure the tip of the gun is 8 to 10 in. (150 to 200
mm) from the surface of the object being sprayed.
Stationary Support Mount
All Manifolds
To mount the gun on a stationary support (refer to FIG.
4. and Mounting Hole Layout, page 28):
1. Attach the gun to the support with two M5 x 0.8 cap-
screws (C). The screws must be long enough to
engage the threaded holes in the gun manifold to a
depth of 1/4 in. (6 mm).
2. Ensure the tip of the gun is 8 to 10 in. (150 to 200
mm) from the surface of the object being sprayed.
Use the 1/8 in. alignment pin (P) to assist in
orienting the gun.
FIG. 3: Reciprocating Arm Mount
TI8111a
A
B
P
FIG. 4: Stationary Support Mount
CTI8112a

Setup
8311053E
Setup
Air Line and Accessory
Recommendations
1. Install an air pressure regulator on the gun cylinder
air supply line.
A minimum of 70 psi (0.49 MPa, 4.9 bar) air pres-
sure must be supplied to the cylinder for proper
operation. Air pressure opens the valve, a spring
closes the valve. A three-way air valve, which
exhausts cylinder air, is required.
2. Install a bleed-type air shutoff valve on the main air
line. Install an additional bleed-type valve on each
pump air supply line, downstream of the pump air
regulator, to relieve air trapped between this valve
and the pump after the air regulator is shut off.
3. Install a bleed-type air shutoff valve on the gun air
cylinder supply line, downstream of the air regulator,
to shut off air to the gun cylinder. Connect the air
supply line to the gun cylinder air inlet (C). See Fig.
4.
Fluid Line and Accessory
Recommendations
1. Install a fluid filter and drain valve(s) close to the
pump's fluid outlet.
2. Install a fluid pressure regulator to control fluid pres-
sure to the gun.
3. Install a fluid shutoff valve to shut off the fluid supply
to the gun.
4. For paint spray applications, install an in-line fluid fil-
ter, part no. 210500, on the gun fluid inlet (F) to
avoid clogging the spray tip with particles from the
fluid. See Fig. 4.
5. Connect the electrically conductive fluid hose to the
gun fluid inlet (F) or optional in-line filter.
The bleed-type air shutoff valve is required in your sys-
tem to relieve air trapped between this valve and the
pump after the air regulator is closed. Trapped air can
cause the pump to cycle unexpectedly, which could
result in serious injury.
The cylinder air inlet accepts 1/4 in. (6.3 mm) O.D.
tubing.
• A fluid drain valve(s) is required in your system to
assist in relieving fluid pressure in the displacement
pump, hose and gun; triggering the gun to relieve
pressure may not be sufficient.
• A fluid pressure regulator must be installed in the
system if the pump's maximum working pressure
exceeds the gun's maximum fluid working pressure
(see the front cover).
Some applications require fine-tuned control of fluid
pressure. You can control fluid pressure more accu-
rately with a fluid pressure regulator than by regu-
lating the air pressure to the pump.

Setup
311053E 9
Manifolds 288219 and 288220
6. In a circulating system, connect an electrically con-
ductive fluid hose to the gun fluid outlet (G).
In a non-circulating system, remove the gun fluid
outlet fitting (G) and plug the outlet port with the
pipe plug (109) supplied.
Manifold 244930
7. This manifold is equipped with passages for circulat-
ing water to maintain the temperature of the gun.
Ports provided are:
• Side water inlet, 1/4 npt(f)
• Top water outlets, 1/8 npt(f)
• Side RTD sensor, 1/8 npt(f)
See Accessories, page 26, for available fittings and
sensors.
FIG.5
KEY
C Cylinder Air Inlet: accepts 1/4 in. (6.3 mm) O.D. tubing
F Fluid Inlet: 1/4-18 nptf or #5 JIC (1/2-20 unf)
G Fluid Outlet (circulating gun only): 1/4-18 nptf or #5 JIC (1/2-20 unf)
FAN ATOM
CYL
G (or F)
C
F (or G)
TI8113a
FIG.6
KEY
L Water Outlet: 1/8 npt(f)
M Air Inlet (to open valve): 1/8 npt(f)
N Fluid Inlet: 3/8(f)
P Water Inlet: 1/4 npt(f)
L
N
L
M
P
TI8115a
TI8116a

Setup
10 311053E
Flush Spray Gun
Before running any paint through the spray gun:
1. Flush the gun with a solvent that is compatible with
the fluid to be sprayed, using the lowest possible
fluid pressure and grounded metal container.
2. Perform Pressure Relief Procedure; see page 11.
Install Spray Tip
1. Perform Pressure Relief Procedure; see page 11.
2. Install the spray tip (H) and the gasket (J) in the tip
retainer nut (K). Screw the assembly firmly onto the
gun. Tighten the assembly with a wrench. See FIG.
7.
Adjust Spray Pattern
1. To adjust the spray pattern direction with fan tips,
orient the slot in the tip horizontally for a horizontal
pattern and vertically for a vertical pattern. See Fig.
7.
2. Start the pump. Adjust the fluid pressure until the
spray is completely atomized. Use the lowest pres-
sure necessary to get the desired results. Higher
pressure may not improve the spray pattern and will
cause premature tip wear and pump wear.
3. The spray tip orifice and spray pattern angle deter-
mines the coverage and size of pattern. When more
coverage is needed, follow the Pressure Relief
Procedure, page 11, and install a larger spray tip
rather than increasing fluid pressure.
Adjust a Streaming Tip
Select a tip that will supply a stream at the required flow
rate at the lowest pressure.
FIG. 7: Install Spray Tip
Gaskets are included with Streaming Tips 270XXX
or Fan Tips 182XXX.
TI8577a
K
H
J
FIG. 8: Spray Pattern
Vertical Pattern
Horizontal Pattern
TI8170a
TI8196a

Operation
311053E 11
Operation
Pressure Relief Procedure
1. Shut off the power to the pump.
2. Turn off the air and fluid supply to the gun.
3. Close the bleed-type master air valve (required in
the system).
4. Trigger the gun into a grounded metal waste con-
tainer to relieve the fluid pressure.
5. Open the pump drain valve (required in the system)
to help relieve fluid pressure in the displacement
pump. In addition, open the drain valve connected to
the fluid pressure gauge (in a system with fluid regu-
lation) to help relieve fluid pressure in the hose and
gun. Triggering the gun to relieve pressure may not
be sufficient. Have a container ready to catch the
drainage.
6. Leave the drain valve(s) open until you are ready to
spray again.
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 steps above, very slowly
loosen the hose end coupling and relieve pressure
gradually, then loosen the coupling completely. Now
clear the tip or hose obstruction.
Apply the Fluid
Adjust the system control device, if it is automatic, so the
gun starts spraying just before meeting the workpiece
and stops as soon as the workpiece has passed. Keep
the gun a consistent distance, 8 to 10 in. (200 to 250
mm), from the surface of the object being sprayed.
To achieve best results when applying fluid:
• Keep gun perpendicular and 8 to 10 inches (200 to
250 mm) from object being sprayed.
• Use smooth, parallel strokes across surface to be
sprayed with 50% overlap. See FIG.10.
FIG. 9: Pressure Relief
TI8174a
FIG. 10: Correct Spray Method
Incorrect
Correct
TI8098a
TI8099a

Daily Gun Care
12 311053E
Daily Gun Care
CAUTION
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 compo-
nents.
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 immerse the gun in solvent.
Do not wipe the gun with a cloth soaked in solvent;
ring out the excess.
TI8100a
TI8101a
TI4827a

Daily Gun Care
311053E 13
General System Maintenance
• Perform Pressure Relief Procedure, page 11.
• Clean the fluid and air line filters daily.
• Check for any fluid leakage from the gun and fluid
hoses. Tighten fittings or replace equipment as
needed.
• Flush the gun before changing colors and whenever
you are done operating the gun.
Daily Cleaning Procedure
1. Follow Pressure Relief Procedure, page 11.
2. Clean the outside of the gun with a soft cloth damp-
ened with compatible solvent.
3. To avoid damaging the spray tip, clean it with a com-
patible solvent and soft brush.
4. If using an in-line filter, remove and clean it thor-
oughly in a compatible solvent.
5. Clean the system's fluid filter and air line filter.
Daily Flushing Procedure
1. Follow Pressure Relief Procedure, page 11.
2. Remove the spray tip. Clean the parts.
3. Supply a compatible solvent to the gun fluid inlet.
4. Start the pump and operate it at its lowest pressure.
5. Trigger the gun into a grounded metal waste con-
tainer until all the material is removed from the gun
passages.
6. Follow Pressure Relief Procedure, page 11.
7. Disconnect the solvent supply.
CAUTION
This gun is not adjustable. To ensure proper shutoff,
screw the piston cap (18) onto the housing (1) until it
bottoms out.
Clean the front of the tip frequently during the day
to help reduce buildup.
To reduce the risk of serious injury, including splash-
ing fluid in the eyes or on the skin, or static electric
discharge when flushing:
• Ensure that the entire system, including flushing
pails, are properly grounded.
• Remove the spray tip.
• Maintain metal to metal contact between the gun
and the flushing pail.
• Use the lowest possible pressure.
Flush the pump and gun before the fluid can dry in
it.
If it is available, the flushing procedure provided in
the pump or sprayer manual should be used
instead of this procedure.
FIG.11
TI8174a

Troubleshooting
14 311053E
Troubleshooting
General Troubleshooting
Check all possible remedies in the troubleshooting
charts before disassembling the gun.
Some improper patterns are caused by the
improper balance between air and fluid. Refer to
Spray Pattern Troubleshooting, page 16.
Problem Cause Solution
Fluid leakage through venting holes. Worn o-rings or packings on needle
assembly (12).
Replace o-rings or needle assembly.
Air leakage through venting hole. Worn o-ring (23). Check and replace as needed.
Air leakage from back of gun. Worn o-rings (22, 23). Replace o-rings.
Fluid leakage from front of gun. Fluid needle (12) is dirty, worn, or
damaged
Dirty or worn seat (10, 41).
Spray tip seal is leaking.
Seat (10, 41) is insufficiently tight-
ened or gasket (11) is missing or
worn from multiple uses.
Clean or replace fluid needle.
Clean or replace the seat (10, 41)
and gasket (11). The gasket must be
replaced whenever you remove the
seat from the gun.
Tighten nut (7) or replace spray tip
gasket (8).
Tighten seat (10, 41) and replace
gasket (11). The gasket must be
replaced whenever you remove the
seat from the gun.

Troubleshooting
311053E 15
Fluid needle will not trigger Loose or missing fluid needle stop
(17) or setscrew (16).
Broken fluid needle (12).
Air leaking around piston (21).
Swollen piston o-ring (22).
Insufficient air pressure on the trig-
ger.
Spray tip (9) is plugged.
Plug (4) is in the incorrect fluid port.
Replace stop (17) or tighten setscrew
(16).
Replace fluid needle (12).
Replace o-ring (22) or piston assem-
bly (21).
Replace o-ring (22). Do not immerse
piston in solvent.
Increase the air pressure or clean the
air line.
Clean the spray tip (9).
Move the plug to the fluid port consis-
tent with manifold plumbing, unless
you are using the gun in a circulating
system. If you are, all fluid ports
should be open, both inside the gun
and on the manifold.
Fluid does not shut off. Piston cap (18) not fully tightened.
Spring (19) not in place.
Swollen piston o-ring (22).
Tighten piston cap until it bottoms
out.
Check spring position.
Replace o-ring. Do not immerse pis-
ton in solvent
Problem Cause Solution

Troubleshooting
16 311053E
Spray Pattern Troubleshooting
Problem Cause Solution
Fluttering spray. Insufficient fluid supply.
Air in paint supply line.
Adjust fluid regulator or fill fluid sup-
ply tank.
Check, tighten siphon hose connec-
tions, bleed air from paint line.
Spitting spray. Worn seat (10, 41) or needle (12)
ball.
Dirty spray tip (9).
Swollen piston o-ring (22).
Inspect seat and needle for wear.
Replace if necessary. The gasket
(11) must be replaced whenever you
remove the seat from the gun.
Clean.
Replace o-ring. Do not immerse pis-
ton in solvent.
Irregular pattern. Fluid build-up or spray tip partially
plugged.
Clean spray tip; see Daily Gun Care,
page 12.
Air cap loosening. (Sealant gun only) Air cap (18) not properly tightened.
Gasket (38) worn.
Tighten. See Reassembly, page 19,
step 13.
Replace gasket.

Service
311053E 17
Service
Disassembly
1. Follow Pressure Relief Procedure, page 11.
2. Unscrew the four screws (14) and remove the gun
from the manifold.
3. Unscrew the tip retainer nut (7). Remove the spray
tip (9) and gasket (8). See Figs. 8 and 9.
4. Remove the cap (18) from the piston housing (1).
Remove the springs (20 and 19).
5. Using the supplied wrench (34), loosen the fluid
needle setscrew (16). Remove the needle stop (17).
6. Remove the seat (10, 41).
7. Pull the needle assembly (12) straight out the front
of the gun. Remove the o-rings (31) from the fluid
needle (12).
8. Remove the gasket (11).
9. Remove the piston. Using a pliers, pull the piston
(21) out of the piston housing (1).
10. If necessary, unscrew the two screws (15) holding
the fluid housing (2) to the piston housing (1). If
worn, remove the gasket (13) from the bottom of the
piston housing.
11. Remove the large o-ring (22) from the piston and
the smaller o-ring (23) from the piston shaft.
Remove the two o-rings (25, 26) from each of the
piston stems. Check that the stems are solidly in
place. If they are loose, replace the entire piston
assembly (21).
12. Perform the following applicable step:
•Non-circulating Paint Guns: Remove the fluid
outlet port plug (4) and gasket (3) from the fluid
housing (2). Remove the o-ring (5) and backup
(6) from the plug.
•Circulating Paint Guns: Remove the gasket (3)
from the fluid housing (2).
•Sealant Gun: Remove the gasket (3).
13. Clean all parts and replace any worn parts. When
assembling, lubricate the threads with anti-seize
lubricant.
Follow the Service Notes in Figs. 8 and 9 when
reassembling the gun.
Gun repair kits are available. See page 18. Refer-
ence numbers marked with an asterisk (*) in the
service procedures are included with the 288171
Air Seal Repair Kit. Reference numbers marked
with a symbol (†) in the service procedures are
included with the 288137 Fluid Repair Kit.
CAUTION
Be sure to keep the needle straight when removing it
from the gun. If the needle is bent it must be replaced.
CAUTION
Install a new gasket (11) whenever you remove the
seat (10, 41) from the gun. Failure to install a new
gasket may result in fluid leaking into the air chamber.
FIG.12
1
15
2
15
TI8197a
38
(model 288554 only)

Service
18 311053E
FIG.13
SERVICE NOTES:
Seat gasket (11) must be replaced if seat (10) is
removed or replaced to avoid fluid leakage
Lubricate threads with anti-seize lubricant
Lubricate with light-weight oil
Do not lubricate
Torque to 20-25 ft-lb (27-34 N•m)
Apply semi-permanent anaerobic sealant
Torque to 4-5 in-lb (0.45-0.56 N•m)
Tighten cap (18) until it bottoms out
Model 288554 only
1
4
3
2
8
7
6
5
TI8117a
9
710
25*
2
2
2
3
3
1
8
18
22* 20
26*
1
5
2
3
11†
23* 3
3
6
7
21
16
17
13*
12
8
3†
19
4
38 9
9

Service
311053E 19
Reassembly
1. Perform the following applicable step:
•Non-circulating Paint Guns: Lubricate the
backup (6) and o-ring (5) and install them on the
fluid outlet port plug (4). Install the plug in the
fluid outlet port of the fluid housing (2). See FIG.
13. Reinstall the gasket (3).
•Circulating Paint Guns: Reinstall the gasket (3)
in the fluid housing (2).
•Sealant Gun: Reinstall gasket (3).
2. Install the o-rings (22*, 23*) on the piston (21).
Install two o-rings (25*, 26*) on each of the piston
stems. Lubricate all the o-rings, the piston, and the
piston stems.
3. Install the fluid housing (2) on the piston housing (1)
with the gasket in place.
4. Reinstall the two screws (15) to secure the piston
housing to the fluid housing (2). Torque to 30 in-lb
(3.4 N•m).
5. Insert the piston (21) into the piston housing (1).
6. Remove the protective paper from the sticky side of
the gasket (13*) and adhere the gasket to the bot-
tom of the piston housing (1), making sure the three
holes in the gasket are properly aligned with the
matching holes in the housing.
7. Install the o-rings (31) on the fluid needle assembly
(12). Lubricate with light weight oil.
8. Insert the needle assembly (12) into the front of the
fluid housing (2). Push it straight back through the
piston.
9. Install a new gasket (11) in the fluid housing (2).
10. Lubricate the threads of the seat (10, 41). Screw it
into the fluid housing (2) and torque to 20-25 ft-lb
(27-34 N•m).
11. Install the needle stop (17) on the needle. Coat the
setscrew (16) with semi-permanent anaerobic seal-
ant and install the screw into the needle stop.
Torque to 4-5 in-lb (0.45-0.56 N•m). Pull on the nee-
dle to make sure it seats fully.
12. Install the springs (19, 20).
13. Lubricate the threads of the piston housing (1).
Screw the cap (18) onto the housing until it bottoms
out.
14. Model 288554 only: Hand tighten cap (18) until it
engages gasket (38). Then tighten cap a half turn
more to ensure cap will not loosen during operation.
15. Do not lubricate the gasket (8). Install the spray tip
(9) and gasket (8) in the tip retainer nut (7). Screw
the assembly firmly onto the gun. Tighten the
assembly with a wrench, but do not exceed 5 ft-lb
(6.8 N•m) for model 233670 gun.
16. Reinstall the gun on the manifold with the four
screws (14). Torque to 65 in-lb (7.3 N•m).
CAUTION
Install a new gasket (11) whenever you remove the
seat (10, 41) from the gun. Failure to install a new
gasket may result in fluid leaking into the air chamber.
CAUTION
Be sure to keep the needle straight when installing it
in the piston housing. If the needle is bent it must be
replaced.

Parts
20 311053E
Parts
Model 288048
FIG.14
SERVICE NOTES:
Seat gasket (11) must be replaced if seat (10) is
removed or replaced to avoid fluid leakage
Lubricate threads with anti-seize lubricant
Lubricate with light-weight oil
Do not lubricate
Torque to 20-25 ft-lb (27-34 N•m)
Apply semi-permanent anaerobic sealant
Torque to 4-5 in-lb (0.45-0.56 N•m)
Tighten cap (18) until it bottoms out
Used on non-circulating guns only
1
4
3
2
8
7
6
5
9
13*
19
18
20
17
16
12 (ref)
22*
14
21
25*
26*
23*
8
6
7
2
3
3
3
15
3
1
7
9
10
12
14
2
2
5
84
1
11†
3†
4
9
9
9
6†
5† 3
3
TI8090a
2
37