Graco 255109, SG20, SGPro Instructions - Parts Manual

SG20 and SGPro Airless Spray Guns

Models: 255108 and 255109

Maximum Working Pressure: 3600 psi (248 bar, 24.8 MPa)

IMPORTANT SAFETY INSTRUCTIONS. Refer to your

sprayer instruction manual for Pressure Relief, priming and
spray instructions. Keep these instructions.

Model 255108

English

The following Warnings are for the setup, use, grounding, maintenance and repair of this equipment. The exclamation point
symbol alerts you to a general warning and hazard symbols refer to procedure-specific risks. Refer back to these Warnings.
Additional, product-specific warnings may be found throughout the body of this manual where applicable.

- For the application of architectural paints and coatings -

Model 255109

311979F

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EQUIPMENT MISUSE HAZARD

WARNINGS

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.

• Do not spray without tip guard and trigger guard
installed.

• Engage trigger lock when not spraying.

• 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 oper-
ation immediately. Do not use equipment until you iden­tify and correct the problem.

• Keep a working fire extinguisher in the work area.

ids containing such solvents in pressurized aluminum
equipment. Such use can cause serious chemical reaction
and equipment rupture, and result in death, serious injury,
and property damage.

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 manufacturer’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.

PRESSURIZED ALUMINUM PARTS HAZARD

Do not use 1,1,1-trichloroethane, methylene chlo­ride, other halogenated hydrocarbon solvents or flu-

PERSONAL PROTECTIVE EQUIPMENT

You must wear appropriate protective equipment
when operating, servicing, or in the operating area of
the equipment to help protect you from serious
injury. This equipment includes but is not limited to:

• Protective eyewear

• Clothing and respirator as recommended by the fluid and
solvent manufacturer

•Gloves

• Hearing protection

ENG

Instructions/Parts

Pressure Relief Procedure

WARNING

Follow this Pressure Relief Procedure
whenever instructed to relieve pressure,
stop spraying, check or service equipment,

or install or clean spray tip.

1. Turn OFF power and turn sprayer pressure control to low­est pressure setting.

2. Hold gun against side of grounded metal flushing pail.
Trigger gun into pail to relieve pressure.

If you suspect spray tip or hose is clogged or that pressure has
not been fully relieved after following the steps above, VERY
SLOWLY loosen tip guard retaining nut or hose end coupling
to relieve pressure gradually, then loosen completely. Clear
hose or tip obstruction.

Gun Trigger Lock

WARNING

To prevent injury when the gun is not in use, always
set the gun’s trigger lock if unit is being shut down or
left unattended.

Installing Tip (15) and Guard (2) on Gun

WARNING

1.If equipment has recently been operated,
relieve pressure. Set trigger lock (3a).

2. Using a pencil or similar object, insert seat (16) into back
of guard (2).

3. Install guard (2) over end of gun (21). Tighten retaining
nut.

4. Insert tip (15) into slot on guard (2).

Operation

Spraying

1. Unlock trigger lock .

2. Be sure the arrow shaped tip (15) faces forward (spray).

3. Hold gun perpendicular and approximately 12-inches
(304 mm) from surface. Move gun first, then pull gun
trigger (3) to spray a test pattern.

4. Slowly increase pump pressure until coverage is uniform
and even (see sprayer instruction manual for additional
information).

Aligning Spray

Trigger Locked

(no spray)

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Tri gg er U nl ock ed

(spray)

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Setup

WARNING

Make sure sprayer is turned off and unplugged from power
source. Refer to your sprayer instruction manual for priming
and spray instructions.

Connect Gun to Sprayer

1. Attach supply hose to sprayer fluid outlet.

2. Attach other end of supply hose to gun swivel (5). Use two
wrenches (one on the swivel (5) and one on the hose), to
tighten all connections securely.

3. Refer to sprayer instruction manual for priming
instructions.

WARNING

1.Relieve pressure. Set trigger lock.

2. Loosen guard
retaining nut.

3. Align guard (2)
horizontally to spray a
horizontal pattern.

4. Align guard (2)
vertically to spray a
vertical pattern.

3) Horizontal 4) Vertical

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Clearing Clogs

WARNING

1. Relieve pressure. Set trigger lock.

2. Rotate tip (15) 180°. Unlock trigger lock . Trigger gun into
pail or onto ground to remove clog.

3. Set trigger lock. Rotate tip (15) 180° back to spray
position.

Cleanup

Flush gun after each work shift and store in a dry location. Do
not leave the gun or any partsin water or cleaning solvents.

2 311979F

Parts

Series A

15

1a

1b

1a

15a

2

4

21

33

3

Ref
No. Part. No. Description Qty

1 288817 KIT,repair 1
1a SEAT,valve 1
1b NEEDLE,gun 1
1c 115483 NUT,lock 1
2✓ 237859 GUARD, RAC IV 1
3 243639 TRIGGER, kit, 4 finger, assy, includes

1

32 and 33 (model 255108)

288816 TRIGGER, kit, 2 finger, assy, includes

1

32 and 33 (model 255109)
4 195495 GUARD, trigger 1
5 238817 SWIVEL, gun 1
6✓ 288749 FILTER, gun; latex, 50 mesh 1

288750 FILTER, gun, latex, 100 mesh 1
7✓ 179733 SEAL, sleeve 1
8 195395 CAP, end 1
10 115484 PIN, actuator 2
15✓ 221515 TIP, spray, RAC IV 1
15a 243004 RAC IV, gasket and seal kit, (includes 2

1

rubber gaskets and 2 metal seals)

8

1c

*288817 repairs both Series A & B guns.

10

32

6

7

Series B

23

22

24

5

ti8904c

1a replaces the three components of
Series A.

Ref
No. Part. No. Description Qty

21 195389 HOUSING, fluid (Model 255108) 1

195390 HOUSING, fluid (Model 255109) 1
22 113409 RETAINER, guard 1
23 195788 HANDLE, grip (model 255108) 1

15J776 HANDLE, grip (model 255109) 1
24 115485 PACKING, o-ring 1
32 177538 STUD, trigger 1
33 105334 NUT, lock, hex 1

▲ Replacement Danger and Warning labels, tags, and

cards are available at no cost.

✓ Keep these spare parts on hand to reduce downtime.

311979F 3

Maintenance

WARNING

Before performing any maintenance on gun, read all warnings
on front cover of this manual and relieve pressure.

Cleaning/Replacing Filter (6)

1. Relieve pressure. Set trigger lock.

2. Disconnect fluid hose from gun at swivel (5).

3. Disconnect trigger guard (4) from guard retainer (22).

4. Unscrew handle (23) from gun (21).

5. Remove filter (6) through top of handle (23).

6. Clean filter (6). Use a soft brush to loosen and remove
excess debris.

7. Insert clean filter (6) into handle (23).

8. Reattach handle (23) to gun. Tighten securely.

9. (Model 255109 only) If finger guard is not aligned, apply
torque manually, rotating the grip until it is aligned with the
trigger.

10. Reconnect trigger guard (4) to guard retainer (22).

Replacing Needle

9

15b

15a

8

1. Relieve pressure. Set trigger lock.

2. Remove tip (15) and guard (2) from gun.

3. Disconnect fluid hose from gun at swivel (5).

4. Release trigger lock. Squeeze trigger while unscrewing
seat diffuser from front of gun.

5. Remove locknut and end cap.

6. Tap out needle assembly.

7. Use a soft brush to clean out internal passages of gun.

8. Grease o-rings new of needle using a non-silicon grease.

9. Guide new needle (15b) through front of gun.

10. Loosely install end cap and locknut.

11. For needle housing (15a), apply medium strenght (blue)
thread sealant to threads..

12. Squeeze trigger while installing needle housing. Torque to
26-32 ft-lb (35-43 N*m).

13. Hold gun with nozzle facing up.

14. Turn locknut (9) clockwise until you see and feel trigger (3)
raise slightly.

15. Turn locknut (9) 3/4 turn counter-clockwise.

NOTE: When needle is properly adjusted, trigger will move
freely.

16. Connect fluid hose. Install tip (15) and guard (2).

17. Prime sprayer. See sprayer instruction manual.

18. Trigger gun into bucket until fluid flows from gun.

19. Release trigger (3). Fluid flow should stop immediately.

20. Set trigger lock.

21. Aim gun into bucket. Trigger gun. No fluid show flow.

22. If the gun fails tests, steps 19 and/or 21, relieve pressure
and disconnect hose. Readjust needle. Repeat tests.

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Technical Data

Maximum working pressure 3600 psi (248 bar, 24.8 MPa)
Fluid orifice size 0.125 in. (3.18 mm)
Weight (with tip and guard) 22 oz. (630 g)
Inlet 1/4 npsm swivel
Maximum material temperature 120 F (49 C)
Wetted Parts Stainless steel, polyurethane, nylon, aluminum, tungsten carbide, brass
*Noise Level: Sound power 87 dBa

Sound pressure 78 dBa

*Measured at 3.1 ft (1m) while spraying water-based paint, specific gravity 1.36, through a 517 tip at 3000 psi (207 bar, 20.7 MPa) per ISO 3744

For complete warranty information contact your local Graco distributor, call Graco customer

service: 1-800-690-2894 or visit our website: www.graco.com.

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 311979

International Offices: Belgium, China, Japan, Korea

GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440-1441

Copyright 2007, Graco Inc. is registered to ISO 9001

Graco Headquarters: Minneapolis

www.graco.com

Revised 4/2011