Graco 307237L AUTOMATIC AIR SPRAY GUN Owner's Manual

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INSTRUCTIONS-PARTS LIST
This manual contains IMPORTANT
WARNINGS and INSTRUCTIONS
READ AND RETAIN FOR REFERENCE
ORACO
307-237
Rev. L
Supersedes K
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AUTOMATIC
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AIR SPRAY GUN
STAINLESS STEEL FLUID PASSAGES
1LW psi (7bar) MAXIMUM WORKING PRESSURE
Model 210-744 Series C
Basic gun without needle, nozzle or air,cap
With basic gun Model210-744, order the needle-nozzle
kit and air cap you want separately. See Page 8 for
available kits andair caps.
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COMPLETE GUNS*
Model 208-603
With 0.042" nozzle; 0.033' needle;
for light viscosity fluids
Model 208-604
With 0.055'nozzle; 0.046" needle;
for medium viscosity fluids
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Model 208-605
With 0.070" nozzle; 0.061" needle:
for heavy viscosity fluids
(When ordering complete guns, order model number
and specify the air cap you want. See page 8 for
available air caps.
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CONTENTS
Typical Installation..............................................
2
Installation ......................................................
..2
Operation .........................................................
3
Troubleshooting ............................................. 4, 5
Service ............................................................ 5
Parts List. ..........................
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How toOrder Replacement Parts
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Parts Drawing ....................................................
7
Ordering Charts.................................................. 8
Accessories.......................................................
9
Dimensional Drawing.............................
Back Cover
Warranty .............................................
Back Cover
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GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440-1444
@ COPYRIGHT 1976 GRACO INC.
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TYPICAL INSTALLATION
KFV
Automatic Air Spray Gun
B Fluid Line
A-
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INSTALLATION
The Typical System shown above is a guide to the
equipment needed for an automatic spraying system.
For design assistance, contact your Graco representative. See available accessories on page 9.
Use separate air regulators (G)to control atomizingair
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and cylinder air.
Connect a fluid hoseIB) to the gun's 3/8 npsm fluid inlet.
Mount the gun (AI on
a in. (12 mml diameter rod
0.50
mounting fixture which allows you to adjust the spray RECOMMENDED HOSE SIZES (General Purpose)
pattern direction and the gun's distance from the work.
Blow out the fluid lines(6)with air then flush with solvent to remove dirt and contaminants before connecting to the system.
Be sure the compressed air supply is very clean and dry.
Install an air filter (C) to remove harmful dirt and
moisture, which can affect the appearance of your
finished workpiece.
Install a normally closed, 3-way air solenoid valve (Dl
in the cylinder air supply line (El. Connect an air hose
from the solenoid valve to the gun's 1/4 npsm(m)
cylinder air inlet.
Connect an atomizing air supply line IF) t o the gun's
1/4 npsm atomizing air inlet.
2
307-237
Fluid
Length of Run
Hose Size
0-35ft (0-11rnl
35-100ft111-30mI
100-200ft130-W ml
3/8" ID
1/2ID
3/4" ID
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Air
Length of Run
Hose Size
0-100 h IO-3C.ml 5/16" ID
100-2Wft130-WmI 3/8"lD
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Adjust the system's sensing device
(H) so the aun starts
-spraying just before meetiig the workpiece and stops
just after the piece has passed.
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NOTE:
The gun requiresa minimum of40 psi (3 bar)
air pressure to the cylinder. The atomizing
air pressure is generally43-57 Dsi 13-4 barl.
The fluid pressure supply is normally 10 to
15 psi (0.7 to 1.0 bar).
NOTE:
The external inlet threads of this gun are
combination American NPSM and British
Whitworth pipe thread to allow coupling
either type of female swivel unions.
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Strain or filter the paint to remove
coarse particles and
sediment, then check the viscosity
of your paint. Refer
t o chart on page 8 for proper viscosity.
Install the air cap.
Normal Spray Pattern
Proper adjustment will give spray
a
pattern
shaped like this.
See Troubleshooting Chart on page
4 for thecause and
The direction of the spray pattern is controlled by the solution of improper spray patterns.
position of theair cap. The horns of the
air cap should
be the opposite direction (horizontal
or vertical) of the
Cleaning
desired direction of the spray pattern. To change,
CAUTION
loosen and turn the
air cap t o the desired position and
hand tighten theair cap securely.
with the fluid being sprayed and the wetted parts
of the gun to ensure thorough flushing and to
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Adjusting The Spray Pattern
To clean the gun, flush with a compatible solvent until
all traces of paint are removed from the gun passages.
To minimize overspray, adjust the pattern for each part Wipe the outside of the gun clean with a solvent
being coated.
dampened cloth.
For maximum flow,leave the fluid adjustingknob in the
full open position.
The air adjusting screw (271controls the patternshape,
the fluid adjusting screw(181 controls the volume of
fluid output, and the atomizing
air regulator controls the
degree of atomization.
To adjust the panern. turn theair adjusting screw (271
out Icounterclockwise)t o make the spray pattern wider
and flat, or in (clockwise1 to
decrease to a round pattern.
To adjust the volume of fluid output for pressure feed,
turn the fluid adjusting screw(18) out all of the way
(counterclockwise). Then adjustthe air pressure at the
fluid supply until thedesired fluid flow is obtained. For
the final adjustment, turn the fluid adjustingvalve in
of fluid output and ob(clockwise) to reduce the volume
tain the desired results.
.NOTE:
If the fluid adjusting
valve is turned inall the
way, the gun will emit only
air.
Test spray a pattern. Adjust the
air pressure to the gun
until proper atomization is achieved.
NOTE:
Always use the lowest possible atomizing
air
pressure to obtain the desired results.
CAUTION
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Never immerse the gun in solvent. Prolonged exposure to solvent damages the packings. Never
use metal instruments to clean holes inairthe
cap
or fluid nozzle to avoid scratches.which can distort
the sprav pattern.
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If the air cap needs cleaning, removeit from the gun,
soak in solvent and scrub with fine bristled brush.To
clean out holes in the
air cap, use a toothpick or other
soft implement to avoid damaging critical
surfaces.
WARNING
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Pressure Relief Procedure
To reduce the risk of serious bodily injury. including splashing in the eyes
or on theskin, or injury from moving parts, always follow this procedure before checking or servicing any part of
the spray system, before installing, cleaning or
changing fluid nozzles, and whenever you stop
spraying.
1. Turn off theair and fluid supply to the gun.
2. Trigger the gun into a grounded metal waste
container to relieve air and fluid pressure.
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Maintenance
Lubricate the exposed portion ofthe fluid needle 137)
daily; petroleum jelly works well.
For short term operations, patternsize may be reduced
by turning the air and fluid adjusting screws in
Iclockwise).
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307-237
3
TROUBLESHOOTING
Pressure Relief Procedure
To reduce the risk of serious bodily injury, including splashing in the eyes or on the skin, or injury from moving pans, always follow this procedure before checkingor servicing any part of
the spray system, before installing, cleaning or
WARNING
changing fluid nozzles, and whenever you stop
spraying.
1. Turn off the air and fluid supply t o the gun.
2. Trigger the gun into a grounded metal waste
container to relieve air and fluid pressure.
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GUN OPERATION TROUBLESHOOTING CHART
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PROBLEM
CAUSE
SOLUTION
Fluid packingnut leaking
Loose needle packingnut (12, 13).
Worn packing (8. 23).
Tighten.
Replace packing.
Air leakage from front of gun
Air piston 125) and packings(2, 4,
5, 6, 7 )not seating properly.
Clean, service.
Needle 137) worn or damaged.
Worn needle and seatin fluid nozzle (361.
Needle packing nuts(12. 13) too
tight.
Replace needle and nozzle asa set.
Replace fluid nozzle and needle.
Fluid leakagefrom front of gun
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Lubricate and adjust.
SPRAY PATrERN TROUBLESHOOTING CHART
PROBLEM
CAUSE
SOLUTION
Fluttering or
Spitting spray
Insufficient fluid in supply container
Fill supply container.
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Dry or worn fluid needle packing or loose packing Lubricate or replace packings
(8. 23);
nut permitsair to get into fluid passage
tighten packing nuts(12, 13).
Loose fluid nozzle or damaged fluid nozzle taper
seat
Tighten, or replace needle and nozzle.
Dirt betweenfluid nozzle, taper seat and body
Clean.
Loose or crackedfluid inlet fining
Tighten, or replace housing124).
Loose fluid tube in pump or tank
Tighten.
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Fluid buildup onair cap; partially clogged horn
Clean with soft implement or dip in
holes. Full air pressurefrom clean horn hole forces suitable solvent and wipe clean,
fan pattern toward clogged end
Damaged nozzle or air cap holes
Replace damaged part.
Fluid buildup on the perimeter of fluid nozzle
orifice, or partially clogged nozzleorifice
Remove obstruction. Never use a wire or
hard instrument.
Too high atomizationair pressure
Reduce air pressure or adjust air adjusting
screw 1271.
Fluid too thin
Regulate fluid viscosity.
Not enough fluid pressure
Increase fluid pressure.
Low atomization air pressure
Increase air pressure or adjust screw
(27).
Fluid too thick
Regulate fluid viscosity.
Too much fluid
Reduce fluid pressure.
Adjust needle adjusting screw118) until
proper pattern is obtained.
Troubleshooting Chart continuedon page 5.
4
307-237
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aLr&pypb?*4.*-.,.$,
SPRAY PAlTERN TROUBLESHOOTING CHART (Cont.)
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Streaks'
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SOLUTION
CAUSE
PROBLEM
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Last coat of paint appliedtoo wet
Apply drier finish with multiple strokes.
Too much air pressure
Use lowest air pressure necessary.
Insufficient air pressure
Increase air pressure.
Non-uniform spray pattern
Clean or replace air cap.
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\3/8npsm
FLUID INLET
NOTE: Repair Kit 208-609is available (see page 61.
Use all the parts in the kit for the
best results.
Parts included in the kit
are designated with a
double asterisk, for example(8").
oil or Graco
Lubricate new packings with lightweight
TSL and insert packings in cavities.
Install needle (37)
and piston 125""l in gun body.Slide packing nuts onto
needle before inserting needleinto fluid packing cavity.
NOTE: Always replace fluid nozzle gasket (351 when
Push both the needle and piston fully forward and turn
adjusting nut (17)all the way into piston. Turn adjusting
nut two turns counterclockwise, then tighten locknut
(161 to hold adjustment.
replacing fluidnozzle (36).
Air Valve Service
.If there is air leakage at the packing nut (12). tighten
nut. If leakage continues, replace packings (8"").
Fluid Packing Replacement
If fluidleakage occurs at packing nut (13). tighten nut. If
leakage continues, replace packing (23"").
Loosen both packing nuts (12Et 131, then disassemble
air piston and cylinder and remove
needle (371.
With needle in place, screw fluid packing (131
nut in un-
til packing (23")'is fully compressed, then back
off until
free needle movement is attained. Reassemble remainder of gun inreverse order of disassembly.
For best packing life, lubricate exposed portion of
needle 137) daily; petroleum jelly works well.
Remove packing nuts and packings from
cavities, then
clean and inspectall parts forwear or damage. Replace
parts as necessary.
307-237
5
PARTS LIST
Model 208-603 Complete Gun
M o d e l 208-604 Complete Gun
Model 208-605 C o m p l e t e G u n
Include items1-37
REF PART
NO. NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
17
18
19
20
21
22
DESCRIPTION
QTY
AUTOMATIC AIR SPRAY GUN; bare
Series C Includes items 2-34
**103-338 .PACKING, O-ring; Vion"
103-522 .SCREW, sq hd set; 3/8"-16 x 5/8"
*'103-523 .GASKET. copper asbestos
.GASKET, copper asbestos
"103-524
**103-610 .PACKING, O-ring; Viton"
**103-649 .PACKING. O-ring; Vitonm
"160-240
." - .- .PACKING, v-block: leather
162-782 .LOCKNUT
106914 .RING, air cap
*106-916 STUD, coupler: 3/8" npsm
'171-333 .NUT, packing: fluid needle
171-332 .NUT. packing; fluid needle
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'106917 .ADAPTER, air inlet: 1/4-18-6
170-242 .NUT, lock
170-243 .NUT, needle adjusting
1 7 0 . 2 ~ .SCREW, needle adjusting
170-249 .CYLINDER, air piston
724-391 .SPRING, compression; 2.0"
151 mm) long
170-253 .SPRING, compression: 1.375"
(35 mml long
171-722 .HOUSING. valve
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1
1
1
1
1
1
1
2
1
1
1
1
1
2
1
1
1
1
1
1
1
208-609 Repair Kit
iMust be purchasedseparately)
Consists of:
Ref No.
5
6
7
a
23
25
28
23
DESCRIPTION
**106-901
210-743
'"208-718
106-913
106-121
.PACKING, needle
24
.HOUSING, valve
.PISTON, air
25
.BAFFLE, air
26
.AIR ADJUSTING SCREW ASSY
27
Includes items28-33
28 *'168-110 ..PACKING, O-ring: Viton"
29
105456 ..RING, retaining
..HOUSING, spring
31 176-773
32
1&9-8E3 ..WASHER. flat: steel
..scRNJ.
usting
33
34
.GASKET,PTFE
GASKET, fluid nozzle: copper with
35
mineral board insert
NOZZLE: see chart on page 8
36
37
NEEDLE; see chart on page 8
38
AIR CAP; see chart on page8
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OTY
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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'Recommended "tool box" spare parts. Keep on hand to
reduce down time.
"*Included in repair kit 208-m.
Viton" andPTFE are registered trademarksof the
Company.
SERVICE INFORMATION
Changed material on gasket 108-784 (item 35) from
polyethylene to copper with mineral boardinsert.
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Qty.
2
4
REF PART
NO. NO.
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1
1
1
1
1
2
1
1
1
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HOW TO ORDER REPLACEMENT PARTS
1. To be sure you receive the correct replacement
parts,
kit or accessories, always give allof the information
requested in the chart below.
2. Check the parts list to identify the correct part number;
do not use the ref. no. when ordering.
3. Order all parts from your nearest Graco distributor.
.
6
6 digit
PART
NUMBER
307-237
QTY
PART DESCRIPTION
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PARTS DRAWING
Complete gun includes:
Model 208-603
Model 208-604
Model 208-605
I Needle (Ref.
No. 371
1.
Nozzle (Ref. No.3 6 1
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170-245 lO.033”I
170-246 (0.0461
170-247 10.061”)
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176-800 (0.042‘1
176-801 10.055”)
176-802 lO.070)
Ref No. 1
Bare Gun
Includes items2-34
Ref No. 27
Air Adjusting Screw Assy
Includes items28-33
10
307-237
7
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Over 28 Seconds (No. 4 Ford Cup),30 Seconds (No. 2 Zahn Cup). 70 cps: acrylic, epoxies,
vinyk, house paint, block sealers, mill whites, red lead, wood filler and similar fluid.
HEAVY FLUIDS:
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"Includes ring.
***"P"= Pressure
For complete gun:
NOTE: When selecting air capsfor use with complete gun
models, select from air caps recommended for use
with needle-nozzle kits having thesame size needle
and nozzleas the complete gun.
Model 208-603
Model 208-604
Model 208-605
NEEDLE-NOZZLE CONVERSION KITS ( M u s t be ordered separately)
Includes matched needle and nozzle and nozzle gasket 103-464.
TYPE OF FLUID KIT NO.
Light Viscosity
Medium Viscosity
Heavy Viscosity
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307-237
208.606
208-607
208-608
NOZZLE
NEEDLE
Orifice Size Part No. Probe Dia. Part No.
1176-800)
0.055" 1176-801)
0.070'
1176-802)
0.042'
0.033" 1170-245)
0.046' 1170-246)
0.061': (170-247)
I
Chooie from caps
recommended for
Kit No. 208.606
Kit No. 208.607
Kif NO.208-608
ACCESSORIES (must be purchased separately)
GROUNDED BUNA-NAIR SUPPLY HOSE
175 psi (12 barl MAXIMUM WORKING PRESSURE
208-610
205-548
208-611
208-612
3/4"
3/4"
3/4"
3/4"
179 rnrnt
I19 r n r n )
I19 rnrn)
119,rnrn)
6 ft 11.8 rnt 3/4 n p K
15 f t 14.5 r n ) 3/4 nptlrn)
25 ft 17.6 r n ) 3/4 nptlrnt
50 ft 115 rn) 3/4 nptlrn)
FLUID REGULATORS
250 psi (18 barl MAXIMUM WORKING PRESSURE
To reduce and regulate fluid pressure
to one air spray
AIR FILTERS 40 micron filtration
106-146
250 psi (17.5 b a r l MAXIMUM WORKING
PRESSURE
5-125 psi (0.35-9 bar) regulated pressure range
with
gauge. 4 02. bowl with sightglass. 1/2 npt (f)
106-148
250psi (17.5b a r l MAXIMUM WORKING
PRESSURE
Without gauge.
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3/8 nptlf)
gun. 3/8 npsrn(m) and3/8 npt(f) fluidoutlets.
208-831 0-60psi (0-4 bar) regulated pressure range
204-5000-15 psi (0-1 bar) regulated pressure range
205-425 0-60 psi (0-4 barl regulated pressure range
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PAINT STRAINER 202-271
sa0 psi I 6 3 bar) MAXIMUM WORKING PRESSURE
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AIR PRESSURE REGULATOR 207-755
10-125psi (1-9 barl MAXIMUM WORKING
PRESSURE
AIR PRESSURE GAUGE101-180
@2mpsi (0-14 bar) range
U4 npt Inlet b Outlet
307-237
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DIMENSIONAL DRAWING
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3.69
THE GRACO WARRANTY AND DISCLAIMERS
WARRANTY
Graco warrants all equipment manufactured byit and bearingits 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. As purchaser’s sole remedyfor breach of this warranty, Graco will. for a
period of twelve months frum the date of sale, repair M repiace anypan of the equipment prover defective. This warranty applies only when the
equipment is installed, operated and maintained
in accordance with Graco’s written recommendations.
This warranty does not cover, and ,Graco shall not be liable for. any malfunction, damage or wear caused by faulty installation. misapplication,
abrasion, corroslon. Inadequate or Improper maintenance, negligence, accident, tampering.or substitution of non-Graco compment parts, Nor
shall Graco be liable for malfunction, damage or wear caused by the incompatibility with Graco equipment of 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 for examinatii bv Graco t o verifv the claimed
defect, If the claimed defect is verified, Gracowill repair or replace free of charge any defective parts. The equipmentwill be returned to the
original purchaser transportation prepaid. If inspection of the equipment does not disclose anydefect in material or workmanship. repairswill be
made at a reasonable charge.
which charges may includethe the costs of pans. laborand transportation.
.
.
DISCLAIMERS AND LIMITATIONS
THE TERMS OF THIS WARRANTY CONSTITUTE PURCHASER’S SOLE AND EXCLUSIVE REMEDY AND ARE IN LIEU OF ANY OTHER
WARRANTIES (EXPRESS OR IMPLIEDI. INCLUDING WARRANTY OF MERCHANTABiLlTY OR WARRANTY OF FITNESS FOR A PAR.
TICULAR PURPOSE, AND OF ANY NON-CONTRACTUAL LIABILITIES, INCLUDING PRODUCT LIABILITIES,
BASE0 ON NEGLIGENCE OR
STRICT LIABILITY. EVERY FORM OF LIABILITY FOR DIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES OR LOSS IS EXPRESSLY EXCLUDED AND DENIED. IN NO CASE SHALL GRACO’S LIABILITY EXCEED THE AMOUNT OF THE PURCHASE PRICE. ANY ACTION FOR
BREACH OF WARRANTY MUST BE BROUGHT WITHIN TWO IZI YEARS OF THE DATEOF SALE.
EQUIPMENT NOT COVERED BY GRACO WARRANTY
GRACO MAKES NO WARRANTY, AND DISCLAIMS ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO ACCESSORIES, EQUIPMENT. MATERIALS, OR COMPONENTS SOLD BUT NOT MANUFACTURED BY GRACO. These items sold. but notmanufactured bv Graco (such as electric motor. switches. hose. etc.i. are subiect lo the warran.
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ty, if any, Of their manufacturer. Graco will provide purchaser with reasonable assistancein making any claimfor br&
of these warranties.
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Sales Offlces:Atlanta, Chicago, Dallas, Detroit,Los Angeles. Mt. Arlington (N.J.)
Forelgn Offices: Canada; England; Korea; Switzerland; France; Germany; Hong Kong; Japan
GRACO INC.
RO. BOX 1441 MINNEAPOLIS, MN 55440-1441
PRINTED IN U.SA. 307-237 Ion5 Revised 6/94
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