Graco 12004 Operation manual

Instructions-Parts List
Pistol Grip Flow Gun
For dispensing ambient temperature sealants and adhesives.
Important Safety Instructions
Read all warnings and instructions in this manual.
Save these instructions.
See page 2 for part numbers and maxumum work-
ing pressure.
Model 12004X Models 12004 and 12005
Model 12006
309739D

Models
2309739
Models
Pistol Grip, Base Seal Pistol Grip, Tip Seal
Contents
Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Grounding and Electrical Requirements . . . . . . . . 4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pressure Relief Procedure . . . . . . . . . . . . . . . . . 5
Trigger Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Models 12004, 12004X . . . . . . . . . . . . . . . . . . . . 8
Model 12005 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Model 12006 . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Models 12004 & 12004X . . . . . . . . . . . . . . . . . . 12
Model 12005 . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Model 12006 . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 16
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . 16
Part Number Model Description
2500 psi (17.2 MPa, 172 bar) maximum working pressure
C27020 12004 Standard base seal
C27031 12004X Two stage, easy pull
C27067 12005 Balanced piston
Part Number Model Description
2000 psi (13.79 MPa, 137.9 bar) maximum working pressure
C27078 12006 Pistol Grip, Tip Seal

Warnings
309739 3
Warnings
Warning
ELECTRIC SHOCK HAZARD
Improper grounding, setup, or usage of the system can cause electric shock.
•Turn off and disconnect power at main switch before disconnecting any cables and before servicing
equipment.
•All electrical wiring must be done by a qualified electrician and comply with all local codes and regu-
lations.
•Connect only to grounded power source.
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.
•Engage trigger lock when not spraying.
•Follow Pressure Relief Procedure on page 5 if the nozzle clogs and before cleaning, checking or
servicing equipment.
TOXIC FLUID 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.
EQUIPMENT MISUSE HAZARD
Equipment misuse can cause death or serious injury.
•Do not exceed maximum working pressure or temperature rating of 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.
•For professional use only.
•Use equipment only for its intended purpose. Call your Graco distributor for information.
•Route hoses away from traffic areas, sharp edges, moving parts and hot surfaces.
•Do not use hoses to pull equipment.

Grounding and Electrical Requirements
4309739
Grounding and Electrical Requirements
The following are minimum requirements for a basic dis-
pensing system. Your system may include other equip-
ment or objects that must be grounded. Check your local
electrical code for detailed grounding instructions for
your area and type of equipment.
To maintain grounding continuity when flushing or reliev-
ing pressure, always hold a metal part of spray gun
firmly to side of a grounded metal pail. Then trigger
spray gun.
1. Pump: connect a ground wire and clamp to a true
earth ground as shown in pump manual.
2. Applicator: ground through motor cable assembly.
3. Fluid and air hoses: only use electrically conduc-
tive material and air hoses.
4. Dispense gun: ground through connection of hose
or cable.
5. Air compressor: follow manufacturer’s recommen-
dations.
6. Object being sprayed: refer to local code.
7. Fluid supply container: refer to local code.
8. Solvent pails used for flushing: refer to local
code.
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Installation
309739 5
Installation
Inspect flow gun for shipping damage. If damage is
found notify the carrier immediately.
1. Connect flow gun to any standard Graco hose
assembly.
2. Connect the opposite end of the heated hose
assembly to any fluid supply system. See Model
table, page 2 for maximum fluid working pressure
for your gun model.
3. Tighten fluid connections.
4. Before operating gun, squeeze and release trigger a
few cycles. Observe action of cartridge assembly.
Pressure Relief Procedure
1. Shut off air to pump.
2. Close bleed-type master air valve (required in your
system).
3. Hold metal part of spray gun firmly to side of
grounded metal pail. Trigger gun to relieve pressure.
4. Open drain valve and/or pump bleeder valve having
a container ready to catch the drainage.
5. Leave drain valve open until you are ready to
spray/dispense again.
If you suspect the tip/nozzle or hose is completely
clogged or that pressure has not been fully relieved after
following the above steps, VERY SLOWLY loosen the
retaining nut or hose end coupling to relieve pressure
gradually. Then loosen it completely. Clear tip/nozzle or
hose.
Trigger Lock
Always engage trigger lock when you stop dispensing to
prevent gun from being triggered accidentally by hand or
if dropped or bumped.
To engage trigger lock, release trigger and rotate lock
downward. See Fig. 1.
To disengage trigger lock, rotate it upward. See Fig. 2.
If material hose will be suspended by a hanger or
tool balancer, route hose through the suspension
device before securing each end of material hose.
To help prevent injuries, follow this procedure
when you shut off the flow gun and before check-
ing or adjusting any part of gun.
ti3795a
Do not try to force trigger valve open with trigger
lock engaged. This could result in component fail-
ure.
FIG. 1: Trigger Lock Engaged
FIG. 2: Trigger Lock Disengaged
Trigger Lock
Engaged
Trigger Lock
Disengaged

Troubleshooting
6309739
Troubleshooting
Problem Cause Solution
Gun fails to dispense when trigger is
actuated
Material lodged in nozzle Follow Pressure Relief Procedure,
page 5. Clear nozzle of blockage.
Material supply, hose, passages,
clogged
Check material supply settings,
hoses, etc. for proper material supply.
Verify integrity of trigger pin through
yoke. Repair or replace cartridge
assembly as necessary.
Gun fails to dispense when trigger is
engaged
Tension of trigger needs adjustment Check spring tension adjustment at
rear of gun. Spring tension should be
adjusted to allow approximately 1/32
in. of free play on trigger.
Verify integrity of trigger pin through
yoke. Repair or replace cartridge
assembly as necessary.
Needle and seat adapter loose or
worn
Check that seat adapter is tightened
firmly and flush to gun body.
Needle and seat adapter worn.
Replace components as necessary.
Seal leakage Packing adjustment nut not snug Follow Pressure Relief Procedure,
page 5. Tighten packing adjustment
nut.
Worn seals and packings Rebuild gun as necessary.
Material leaks from gun inlet swivel Worn seals Replace seals.

Troubleshooting
309739 7

Service
8309739
Service
Models 12004, 12004X
Disassembly
1. Actuate gun to purge material and relieve pressure
in gun. Pressure Relief Procedure, page 5.
2. Disconnect material supply line from gun handle.
3. Hold adapter (9) stationary and unscrew nozzle and
collar (16).
4. With trigger depressed, unscrew adapter (9) from
gun body (17).
5. Remove o-ring (10) from adapter (9).
6. Loosen lock nut (14).
7. Carefully unscrew and remove spring retainer (15)
and spring (13) from the gun body (17).
8. Remove screw (11) and lock washer (23) from side
of trigger (18).
9. Pull trigger pins (12) from gun body (17) and remove
trigger (18).
10. Unscrew packing nut (5) from gun body (17).
11. Remove cartridge assembly through side of gun
handle.
Cartridge Disassembly Procedure
1. Remove o-ring (4) from groove on packing nut (5).
2. Loosen lock nut (14) on cartridge while holding yoke
(1) in a soft
3. Separate needle/ball (8) from yoke (1) using the slot
in needle/ball to unscrew the yoke.
4. Remove adjusting screw (3) from packing nut (5).
Then, separate needle/ball (8) from packing support
(7).
5. Push seals (6) out of packing nut (5).
Reassembly
Clean all parts thoroughly before reassembling. Check
them carefully for damage or wear, replacing parts as
needed. For best results replace the original parts with
new parts in repair kits.
Prior to assembly, lubricate all seals and o-rings with
PARKER-O-LUBE or an equivalent lubricant.
1. Push seals (6) in the packing nut (5).
2. Screw adjusting screw (3) into packing nut (5).
Insert needle/ball (8) into packing support (7).
3. Attach needle/ball (8) to yoke (1) using slot in the
yoke to screw needle/ball.
4. Secure yoke in soft jawed vice. Tighten lock nut to
cartridge.
5. Install o-ring (4) onto groove in packing nut (5).
6. Insert cartridge assembly through front of gun han-
dle.
7. Screw packing nut (5) in gun body (17).
8. Install trigger (18) and insert trigger pins (12) in gun
body (17). Secure using screws (11) and lock wash-
ers (23).
9. Install snap rings (11) from top to bottom to secure
trigger pins (12).
10. Install spring (13) and spring retainer (15) into the
gun body (17). Adjust spring retainer to allow
approximately 1/32 in. of free play on trigger.
11. Tighten lock nut (14).
12. Install o-ring (10) to adapter (9).
13. With trigger retracted, screw adapter (9) into gun
body (17).
Needle/ball
O-Ring
Yoke
Packing Nut
Adjusting Screw
Nut
Packing Support
Seal
ti3810a
Needle/ball
O-Ring
Yoke
Packing Nut
Adjusting Screw
Nut
Packing Support
Seal
ti3810a

Service
309739 9
14. Hold adapter (9) stationary and screw nozzle and
collar (16) into adapter. Do not over tighten collar.
15. Reconnect flow gun to material supply line.
16. Turn on material supply line.
17. Return flow gun to normal operating condition.
Model 12005
Disassembly
1. Actuate gun to purge material and relieve pressure
in gun. Pressure Relief Procedure, page 5.
2. Disconnect material supply line from gun handle.
3. Hold adapter (9) stationary and unscrew nozzle and
collar (16).
4. With trigger depressed, unscrew adapter (9) from
gun body (17).
5. Remove o-ring (10) from adapter (9).
6. Loosen lock nut (14).
7. Carefully unscrew and remove spring retainer (15)
8. Remove screws (11) and lock washers (28) from
trigger pins (12).
9. Pull trigger pins (12) from gun body (17) and remove
trigger (18).
10. Remove piston valve (20) from front of gun.
11. Unscrew packing nut (5) from gun body (17).
12. Remove cartridge assembly from gun.
Cartridge Disassembly Procedure
1. Remove guide (22) from needle (8).
2. Remove two o-rings (23) from guide (22).
3. Unwind spiral PTFE o-ring backup (21) from
guide(22).
4. Loosen adjustment screw (3) while holding packing
nut (5).
5. Extract needle (8) from packing nut (5).
6. Remove o-ring (4) from groove in packing nut (5).
7. Remove adjustment screw (3).
8. Push three seal-needles (6) out of packing nut (5)
with soft rod or dowel.
9. Hold yoke (1) in soft-jawed vice. Unlock stop nut (2).
10. Separate needle (8) from yoke (1).
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ti4036a
ti4039a
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Service
10 309739
Reassembly
Clean all parts thoroughly before reassembling. Check
them carefully for damage or wear, replacing parts as
needed. For best results replace the original parts with
new parts in repair kits.
Prior to assembly, lubricate all seals and o-rings with
PARKER-O-LUBE or an equivalent lubricant.
1. Connect needle (8) and stop nut (2) to yoke (1).
2. Secure yoke (1) in soft jawed vise. Lock stop nut (2)
against yoke.
3. Insert needle (8) into packing nut (5).
4. Push three seal needles (6) in packing nut (5) using
soft rod or dowel. Orient as shown below
5. Install o-ring (4) on groove of packing nut (5).
6. Install guide (22) on needle (8).
7. Rewind spiral o-ring backup (21) on guide (22).
8. Install two o-rings (23) on guide (22).
9. Insert cartridge assembly in gun body (17) from rear
of gun.
10. Screw packing nut (5) into gun body (17).
11. Insert valve (20) through front of gun on needle (8).
12. Tighten nut (19) on needle (8).
13. Adjust screw (3) to tighten packings.
14. Install trigger (18). Align yoke (1) in gun body (17).
15. Press trigger pin (12) into gun body.
16. Secure trigger pins (12) using screws (11) and lock
washers (28).
17. Install spring (13) and spring retainer (15) into gun
body (17).
18. Adjust spring retainer to allow approximately 1/32 in.
of free play on trigger.
19. Tighten stop nut (14).
20. Install o-ring (10) on adapter (9).
21. With trigger retracted screw adapter (9) on gun body
(17).
22. While holding adapter (9) stationary, screw collar
(16) and nozzle into adapter. Do not over tighten
collar.
23. Reconnect flow gun to material supply line.
24. Turn on material supply line to gun.
25. Return flow gun to normal operating condition.
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