Graco 3M Operation manual

II 2 G
Instructions - Parts List
3
Paint Preparation System
Spray Guns
Table of Contents
Symbols 2
Warnings 2
Selection Charts 2
Typical Installation 3
Setup 3
Operation 6
Daily Gun Care, Flushing and Cleaning 7
Troubleshooting 8
Service 10
Parts 14
Accessories 15
Dimensions 15
Technical Data 15
Warranty 16
Contact information 16
Read warnings and instructions
3M-Graco spray gun systems are intended for use only by trained and
professional tradesmen, and used solely for the purpose of spray
application of liquid coating materials. They must be used only in
areas which are compatible with the material being sprayed, in strict
compliance with applicable local and national regulations.
HVLP, Compliant, and Airspray
0.7 MPa, 7 bar (100 psi) Maximum Working Air Pressure
200 kPa, 2.0 bar (29 psi) Maximum Compliant Inbound Air Pressure
(HVLP and Compliant)
U.S Patent Pending
Manufactured by
®
GB

Spray Gun Assemblies Selection Charts
Symbols
Gun and PPS Cup Orifice Size Pattern Length†Air Cap Housing
Assembly. Part No. mm (in.) mm (in.) Marking Colour
HVLP Guns - 50261 1.3 (.051) 330 (13) H Purple
for high efficiency 50262 1.4 (.055) 330 (13) H Purple
with low pressure 50263 1.5 (.059) 330 (13) H Purple
Air Spray Guns 50255 1.5 (.059) 228 (9) A Black
50256 1.8 (.070) 228 (9) A Black
Compliant Guns 50257 1.3 (.051) 279 (11) C Gold
50258 1.4 (.055) 279 (11) C Gold
50259 1.5 (.059) 279 (11) C Gold
† Measured with gun nozzle 203mm (8in.)
from target surface
Selecting the Proper Nozzle Size
Follow your material suppliers recommendations for proper nozzle size. In general, use the smaller nozzle sizes for low flow rates or
light viscosity materials and larger nozzle sizes for higher flows and higher viscosity materials.
This symbol alerts you to the possibility of damage to or
destruction of equipment if you do not follow the instructions.
This symbol alerts you to the possibility of serious injury or
death if you do not follow the instructions.
Warning Symbol Caution Symbol
CAUTION
WARNING
WARNING
2
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• 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 manufacturers’ warnings. • Check equipment daily. Repair or replace worn or
damaged parts immediately. • Do not alter or modify equipment. • Route hoses and cables away from traffic areas, sharp edges,
moving parts, and hot surfaces. • Do not use hoses to pull equipment. • Comply with all applicable safety regulations.
• This equipment is to be used only by professional tradesmen who are familiar with its possible hazards. • Read all instruction
manuals, tags, and labels before operating the equipment. • Use the equipment only for its intended purpose. See intended use
statement on front cover.
PRESSURIZED EQUIPMENT HAZARD
To reduce the risk of a serious injury, follow the Pressure Relief Procedure on page 6 whenever you are instructed to
relieve pressure.
• Do not stop or deflect fluid leaks with your hand, body, glove or rag.
• Do not point the spray gun at anyone or at any part of the body.
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work areas 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 lights on or off when flammable fumes are present. • Ground equipment and
conductive objects in work area. See Grounding instructions on page 6. • If there is static sparking or you feel a shock,
stop operation immediately. Do not use equipment until you identify and correct the problem.
TOXIC FLUID OR FUMES HAZARD
Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on the 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. • Gloves must be worn for spraying or cleaning the equipment.
INSTRUCTIONS
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A
C
D
EFGH
B
Typical Installation
D
F
G
H
E
D
C
The spray guns were designed to produce the highest
quality finish with today’s automotive paint systems.
The HVLP and Compliant guns typically utilize
200 kPa, 2.0 bar (29 psi) inbound air pressure to
produce high quality paint finishes and comply with
environmental regulations.
The air regulator must have a minimum air flow
capacity of 849 l/min or 30 scfm at 0.7 MPa, 7 bar
(100 psi) air pressure.
Flushing the Spray Gun
Note: Flush the spray gun before putting any paint through the gun.
To flush the gun, squeeze water or solvent into the gun adapter while
triggering the gun.
Make sure to use a solvent that is compatible with paint to be sprayed.
1. Connect the air hose (D) to the 1/4 npsm air inlet (C).
2. Connect the other end of the air hose (D) to a regulated air
supply line (H).
NOTE: Fig. 3 shows the filter (G) air regulator (F), and air shut-off
valve (E) on the air supply line.
Connecting the Air Line
•You must install an air pressure regulator (F) on the gun air line to
control air pressure to the gun. See Fig. 3.
•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. 3.
• Use a 7.9 mm (5/16") I.D. air hose to minimize excessive pressure
drop in the hose.
Ventilate the Spray Booth
WARNING
To prevent hazardous concentrations of
toxic and/or flammable vapours, 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
and Local codes regarding air exhaust
velocity requirements.
Check and follow all local safety and fire codes.
Setup
3
KEY
AGun
See page 14 for
gun part numbers.
B 3M PPS Cup System
C Needle Valve Inlet;
1/4 npsm
D Air Hose
Recommend 7.9mm (5/16") ID hose
Optional 9.5mm (3/8") ID hose
E Air Shut-off Valve
F Air Regulator
G Air Filter
H Air Supply Line
Fig. 1
Fig. 2
Fig. 3
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Setup
Installing 3M™Paint Preparation System (PPS)
1. Weigh paint in the cup with liner according to paint manufacturer’s
instructions before mixing product.
2. Mix product as needed.
3. Take the lid (with built in strainer) and snap onto the top of
PPS cup.
4. Position locking collar onto the PPS cup and turn until tight.
5. With spray gun inverted, lower onto PPS cup and lock gun
adapter, turning clockwise, to lid.
6. Make sure that the lid fingers are fully engaged above
adapter edge.
7. With air line connected, invert gun and pull trigger (fully open
NOT partially) to bleed air from the liner. NOTE: Air only needs
to be bled if spraying in the inverted position.
8. With the air removed from the liner, the gun may be sprayed
upside down or in any direction to reach difficult areas.
Vertical Pattern
Horizontal Pattern
Positioning 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 (25) fully clockwise. Refer to Fig. 11.
PRESSURIZED EQUIPMENT HAZARD
To reduce the risk of a serious injury whenever you are instructed to
relieve pressure, follow the Pressure Relief Procedure on page 6.
WARNING
4
Fig. 4
Fig. 6 Fig. 9
Fig. 5
Paint
cup
Locking
Collar
Paint
cup liner
Sealing
Cap
Paint
cup lid
200
Micron
Strainer
Fig. 7
Fig. 8
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25
21
open
F
Setup
Adjusting the Spray Pattern
Follow these steps to establish the correct fluid flow and air flow:
1. Turn the fluid adjustment knob (21) counter clockwise 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.
2. Turn the pattern adjustment valve (25) fully counter clockwise to
achieve the widest fan pattern.
3. Adjust the air supply regulator (F) to about 100 psi.
4. Trigger the gun and adjust the gun inlet pressure, turning the
needle valve at the gun air inlet:
HVLP, Compliant 200 kPa, 2.0 bar (29 psi)
Air Spray 345 kPa, 3.4 bar (50 psi)
5. Spray a test pattern to evaluate fluid flow and atomization.
6. To reach the desired pattern width, fluid flow rate, and finish,
make the following adjustments:
• For a narrower pattern (25), turn the pattern adjustment
valve clockwise.
• To reduce the fluid flow, turn the fluid adjustment valve (21)
clockwise to limit the trigger travel or replace the nozzle with a
smaller orifice.
• To improve atomization, reduce the fluid flow rate. Increasing the
air pressure can improve atomization but may result in poor
Transfer Efficiency (TE) or non-compliant operation.
7. For HVLP only, to measure the aircap atomizing pressures, use
the accessory aircap verification kit.
NOTES:
• If the fluid adjustment knob is turned clockwise all the way the gun
will emit only air.
• For maximum transfer efficiency, always use the lowest air setting
needed to achieve the desired finish.
• If available, use the fluid manufacturer’s recommendations for this
gun model to set the air line pressure.
•For Compliant guns, to maintain compliant operation
(TE equal to HVLP) the gun inlet pressure must not exceed
200 kPa, 2.0 bar (29 psi).
•For HVLP guns, at 200 kPa, 2.0 bar (29 psi) gun inlet air pressure,
the pressure at the aircap will be 70 kpa, 0.7 bar (10 psi).
•For HVLP guns, local laws may limit the maximum automatic air
pressure to 70 kPa, 0.7 bar (10 psi) at the air cap for HVLP
compliance. The accessory Air Cap Verification Kit 50280 is
available to measure the atomizing pressure at the air cap.
PRESSURIZED EQUIPMENT HAZARD
To avoid injury, never open the fluid adjustment knob (21) beyond the
one half turn indicated in Adjusting the Spray Pattern. If the red
band or undercut on the knob stem (21) is visible, the knob is not
adjusted correctly and could result in serious injury. Repeat steps in
Adjusting the Spray Pattern.
WARNING
5
Fig. 10
Fig. 12
Fig. 11
Close
(narrower
pattern)
Open
(wider
pattern)
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Operation
PRESSURIZED EQUIPMENT HAZARD
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 Procedure whenever you:
• are instructed to relieve the pressure,
• stop spraying,
• check or service any of the system equipment,
• install or clean the spray nozzle.
WARNING
Pressure Relief Procedure
RIGHT
1. Turn off the air supply to the gun.
2. Disconnect air line from the gun.
3. Invert gun and pull trigger (fully open, not partially) to return
mix to gun cap.
Grounding
Ground all equipment and conductive objects and use only grounded
hoses and pails.
Fig. 13
Fig. 14
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 150 to 200 mm (6 to 8 inches) from the object
being sprayed. See Fig. 14.
2. To obtain an even finish, use smooth, even strokes across the
surface to be sprayed with 50% overlap. The PPS gun cup is a
sealed system and can be sprayed in any direction without spills
on vertical or horizontal surfaces.
3. Paint using parallel strokes. This spray gun applies all coatings
evenly without cross coating.
6
WRONG
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Daily Gun Care, Flushing and Cleaning
General System Maintenance Check
✔Relieve the pressure.
✔Clean the fluid and air line filters daily.
✔Check for any fluid leakage from the gun and fluid hoses.
✔Flush the gun before changing colours and whenever you are done
operating the gun.
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 expose needle valve and gauge (30) to solvents or gauge may be damaged.
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 excessive solvent; ring out the excess.
Do not use metal tools to clean the air cap
holes as this may scratch them; scratches
can distort the spray pattern.
CAUTION
PRESSURIZED EQUIPMENT HAZARD
To reduce the risk of a serious injury, follow the Pressure Relief
Procedure on page 6 whenever you are instructed to relieve pressure.
WARNING
Daily Gun Care and Cleaning
PRESSURIZED EQUIPMENT HAZARD
To reduce the risk of a serious injury, follow the Pressure Relief
Procedure on page 6 whenever you are instructed to relieve pressure.
WARNING
Removing the paint supply
Cleaning the gun
1. Relieve the pressure, page 6.
2. Remove PPS cup by inverting the gun. Turn the gun
counterclockwise unlocking the gun adapter from the paint cup.
3. Flush the spray gun, page 3.
4. To retain unused paint, seal the lid with the PPS sealing cap,
label, and temporarily store mixed material in PPS cup.
5. When the PPS cup is empty the collapsed liner and lid may be
disposed. Consult all local and national regulations or authorities
for proper disposal.
1. Remove the air cap retaining ring (15) and air cap (14).
2. Trigger the gun while you remove the fluid nozzle (12) from the
gun with the gun tool (28).
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.
CAUTION
3. Clean the air cap retaining ring, air cap, and fluid nozzle
with solvent.
4. 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. 15
Fig. 16
7
12
2814, 15
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5. With the gun pointed down, clean the front of the gun, using the
soft-bristle brush and solvent.
6. Scrub the air cap retaining ring, air cap, and fluid nozzle with the
soft-bristle brush. To clean out air cap holes, use the small brush
provided. 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.
7. To avoid galling of the fluid nozzle in the spray housing (2a) apply
a thin film of lubricant to the back surface of the nozzle taper
where it seats and also to the nozzle threads. Trigger the gun while
you install the fluid nozzle (12) with the gun tool (28). Tighten the
nozzle securely to 4.5 N•m (40 in-lb) to obtain a good seal.
Do not over torque.
8. Install the air cap retaining ring (15) and air cap (14).
9. Dampen a soft cloth with solvent and wring-out the excess.
Point the gun down and wipe off the outside of the gun.
Daily Gun Care and Cleaning
Fig. 19
Fig. 17 Fig. 18
Fig. 20
Troubleshooting
PRESSURIZED EQUIPMENT HAZARD
To reduce the risk of a serious injury, follow the Pressure Relief
Procedure on page 6 whenever you are instructed to relieve pressure.
WARNING
Correct fan pattern Follow all Setup procedures, starting on page 3. Hang some 3M masking paper. Hold spray gun with
Air Cap perpendicular and 200mm (8") from masking paper. Spray for two seconds and check what
you get for fan pattern outline on the paper. See troubleshooting chart for how to adjust / service
spray gun to correct Fan Pattern defects.
Fluttering or spitting spray
PROBLEM CAUSE AND SOLUTION
Loose or damaged fluid tip/seat (Tighten or replace).
Material level too low in cup (Refill cup).
Gun cup tilted too far over or upside down while spraying (Purge Air out of PPS cup).
Partial obstruction in fluid passage (Flush with solvent).
Dry or loose fluid needle packing nut (Lubricate or tighten).
Pattern is curved Air Cap or Fluid Tip Defective. Determine if defect is in the Air Cap or Fluid Tip. Rotate Air Cap
one-half turn and spray another test pattern. If defect is inverted/reverse of previous fan pattern,
then defect is in the Air Cap. Clean Air Cap.
If defect is not inverted/reverse of previous Fan Pattern, defect is in the Fluid Tip. Check Fluid Tip for
damage or partial blockage with dried material. Check Fluid Needle Tip for damage. Replace as necessary.
Torque to 4.5 N•m (40 in-lb)
8
712
2814, 15
7
GB

Starving Fan Pattern.
Fan pattern begins to narrow down.
PROBLEM SOLUTION
PPS liner bottomed out on top of strainer or collapsed around strainer, blocking flow (Disconnect air,
with PPS cup below gun, pull trigger to re-open liner, re-connect air and spray mix without purging air
from liner).
Air supply pressure drops due to air supply defects such as other air tools being used draws down
system pressure & CFM flow.
Pattern is off-set or heavy on one end One or more Air Horn holes plugged (Clean Air Cap).
Fluid Needle Tip damaged (Replace Fluid Needle Tip).
Fluid Nozzle damaged or partially blocked (Clean and/or replace Fluid Nozzle).
Pattern is heavy in the centre Air Pressure is too low (Increase Air Pressure).
Fan Pattern set too narrow (Open Fan Pattern).
Material is too thick (Reduce / Thin the mix).
Pattern is split Air Pressure is too high (Reduce Air Pressure).
Fan Pattern set too wide (Close down Fan Pattern).
Will not spray. Not enough flow/air pressure at gun (Check air supply source and hose).
Fluid needle not open enough (Open fluid needle more).
Mix is too thick for fluid tip size (Change to larger size).
Fluid leaking/dripping from PPS cup. PPS cup lid loose (Tighten PPS Locking Collar).
Crack in PPS Lid or Liner (Replace).
PPS lid spout not fully engaged with PPS Adapter.
Fluid leaking/dripping from gun. Check for missing or damaged O-ring (34) at base of Fluid Nozzle on the Fluid/Adapter Housing.
Fluid needle packing nut too tight or binding (Loosen nut or lubricate needle shaft).
Needle tip damaged (Replace).
Fluid Nozzle nicked or damaged (Replace).
Mix residue dried in gun (Clean & Lube gun).
Excessive overspray. Too much air pressure (Reduce air pressure).
Gun too far from work surface (Move in and keep the fan pattern perpendicular to the surface to
be sprayed).
PROBLEM CAUSE AND SOLUTION
Troubleshooting
9
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1
2
3
4
5
6
7
1
4
2a2b*
5*
89
10
11
17
1213
1413a
15
26*
16*
22*
20*
23*
19
24
25c
21
25a
25b*
25d
18
30
30a
34*
15b*
1
1
1
1
2
2
3
3
3
3
5
4
6
6
7
A
35*
HVLP and
Compliant
(groove)
Airspray(no
groove)
HVLP
(smaller ID)
Airspray
andCompliant
2928
Service
Fig. 21
Lightly lubricate
Lightly lubricate threads
Torque to 14-15 N•m (125-135 in-lb)
Torque to 2.3-3.4 N•m (20-30 in-lb)
U-cup lips face air valve assembly (26)
U-cup lips face away from nut (19/25a)
Torque to 4.5 N•m (40 in-lb)
* Parts included in Rebuild Kit 50275
10
Item 2 includes 2a-2b
Item 13 includes 13a
Item 25 includes 25a-25d
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