Graco Bulldog Hydra-Cat Series Datasheet

Instructions – Parts List
BULLDOG HYDRA–CATRFIXED RATIO
Proportioning Pumps
3000 psi (21 MPa, 207 bar) Maximum Working Pressure
Two or Three Displacement Pump Models
in Various Mix Ratios, Pressure Ratios
and Flow Volume
Available as Bare Pumps,
Wall-Mounted* or Free-Standing* Models
*Includes Mixing Manifolds, Automatic Pressure Relief Valves,
Check Valves, Pressure Gauges and Regulators
Table of Contents
Warnings 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Charts 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Installations 7, 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation – Optional Fluid Heaters 13. . . . . . . . . . . . . . . . . . . . . . .
Installation – Optional Solvent Pump 15. . . . . . . . . . . . . . . . . . . . . .
Flushing 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shutdown and Care of the System 23. . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service – Displacement Pump 26. . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Standard Warranty 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
308225K
EN
Read warnings and instructions.
For a list of models, see page 6.
02910A

3082252
Symbols
Warning Symbol
WARNING
This symbol alerts you to the possibility of serious
injury or death if you do not follow the instructions.
Caution Symbol
CAUTION
This symbol alerts you to the possibility of damage to
or destruction of equipment if you do not follow the
instructions.
WARNING
INJECTION HAZARD
Spray from the gun, hose leaks, or ruptured components can inject fluid into your body and cause
extremely serious injury, including the need for amputation. Splashing fluid in the eyes or on the skin
can also cause serious injury.
DFluid injected into the skin might look like just a cut, but it is a serious injury. Get immediate medi-
cal attention.
DDo not point the spray gun at anyone or at any part of the body.
DDo not put your hand or fingers over the spray tip/nozzle.
DDo not stop or deflect leaks with your hand, body, glove or rag.
DDo not “blow back” fluid; this is not an air spray system.
DCheck the gun diffuser operation weekly. Refer to the gun manual.
DAlways have the trigger guard on the spray gun when spraying.
DCheck the gun diffuser operation weekly. Refer to the gun manual.
DBe sure the gun trigger safety operates before spraying.
DLock the gun trigger safety when you stop spraying.
DFollow the Pressure Relief Procedure on page 19 if the spray tip/nozzle clogs and whenever you:
are instructed to relieve pressure; stop spraying; clean, check, or service the equipment; and install
or clean the spray tip/nozzle.
DTighten all fluid connections before operating the equipment.
DCheck the hoses, tubes, and couplings daily. Do not mend or repair any part of the hose assembly.
If the hose is damaged, replace it immediately.
MOVING PARTS HAZARD
Moving parts, such as the air motor piston can pinch or amputate fingers.
DDo not operate the equipment with the air motor plates removed.
DKeep your body and tools clear of any moving parts when starting or operating the equipment.

308225 3
WARNING
FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD
Improper grounding, poor ventilation, open flames, or sparks can cause a hazardous condition and
result in fire, explosion, electric shock or other serious injury.
DGround the equipment and the object being sprayed. See Grounding on page 10.
DDo not use the heater with flammable liquids, such as those having flash points below 200_F
(93_C).
DAll electrical wiring must be done by trained and qualified personnel and comply with all local codes
and regulations.
DIf there is any static sparking while using the equipment, stop spraying immediately. Identify and
correct the problem.
DProvide fresh air ventilation to avoid the buildup of flammable fumes from solvents or the fluid
being sprayed.
DDo not smoke within the spray area.
DExtinguish all the open flames or pilot lights within the spray area.
DKeep the spray area free of debris, including solvent, rags, and gasoline.
DElectrically disconnect all the equipment within the spray area.
DDo not turn on or off any light switch within the spray area while operating or if fumes are present.
DDo not operate a gasoline engine within the spray area.
TOXIC FLUID HAZARD
Hazardous fluid or toxic fumes can cause serious injury or death if splashed in the eyes or on the skin,
inhaled, or swallowed.
DKnow the specific hazards of the fluid you are using.
DStore hazardous fluid in an approved container. Dispose of hazardous fluid according to all local,
state and national guidelines.
DAlways wear protective eyewear, gloves, clothing and respirator as recommended by the fluid and
solvent manufacturer.
DGraco does not manufacture or supply any of the reactive chemical components that may be used
in this equipment and is not responsible for their effects. Graco assumes no responsibility for loss,
damage, expense or claims for personal injury or property damage, direct or consequential, arising
from the use of such chemical components.

3082254
WARNING
INSTRUCTIONS
EQUIPMENT MISUSE HAZARD
Equipment misuse can cause the equipment to rupture or malfunction and result in serious injury.
DThis equipment is for professional use only.
DRead all instruction manuals, tags, and labels before operating the equipment.
DUse the equipment only for its intended purpose. If you are uncertain about usage, call your Graco
distributor.
DDo not alter or modify this equipment. Use only genuine Graco parts and accessories.
DCheck equipment daily. Repair or replace worn or damaged parts immediately.
DSee the chart on page 6 for important pressure rating information. The maximum working pres-
sure of each model is also shown on the pump identification plate. Be sure that all dispensing
equipment and accessories are rated to withstand the maximum working pressure of your pump.
Do not exceed the maximum working pressure of the lowest rated system component.
DNever operate the pump without the automatic pressure relief valves and drainage kits installed.
These valves relieve fluid pressure through a drain port at the bottom of the valve if the displace-
ment pump pressure exceeds the working pressure.
DDo not lift pressurized equipment.
DUse only Graco approved hoses. Do not remove hose spring guards, which help protect the hose
from rupture caused by kinks or bends near the couplings.
DRoute the hoses away from the traffic areas, sharp edges, moving parts, and hot surfaces. Do not
expose Graco hoses to temperatures above 180_F (82_C) or below –40_F (–40_C).
DDo not use the hoses to pull the equipment.
DUse fluids and solvents that are compatible with the equipment wetted parts. See the Technical
Data section of all the equipment manuals. Read the fluid and solvent manufacturer’s warnings.
DComply with all applicable local, state and national fire, electrical and other safety regulations.

308225 5
Notes
head.notes

3082256
Model Charts
Pressure and Ratio Ratings for Bulldog Pumps
WARNING
COMPONENT RUPTURE HAZARD
To reduce the risk of over-pressurizing a component, which can result in an explosion and serious injury, never
operate the system at a working pressure higher than the lowest rated component in the system. All fluid side
components, such as dispensing valves; regulators; and hoses, must have a working pressure equal to or
greater than the pressure given in Column B for each pump model.
Column A gives the maximum pump fluid output pressure.
Column B gives the minimum working pressure required for all system components, based on the automatic relief
valve settings. Components included by Graco with the models listed meet or exceed this requirement.
Models with Two Displacement Pumps
AB
Mix
Model No.
Maximum Pump
Fluid Output
Pressure*
At Maximum
Air Pressure
Of:
Minimum
Component
Working Pressure
Normal
Pressure
Ratio
(Fl id t Ai )
Nominal
Flow
Volume
@ 40 cpm
Mix
Ratio Bare Wall Stand psi MPa, bar psi MPa, bar psi MPA, bar (Fluid to Air) gpm lpm
1:1 231897 231836 231865 3000 21, 207 86 0.6, 6 3000 21, 207 34.7 1.8 6.8
Models with Three Displacement Pumps
AB
Mix
Model No.
Maximum Pump
Fluid Output
Pressure*
At Maximum
Air Pressure
Of
Minimum
Component
Working Pressure
Normal
Pressure
Ratio
(Fl id t Ai )
Nominal
Flow
Volume
@ 40 cpm
Mi
x
Ratio Bare Wall Stand psi MPA, bar psi MPa, bar psi MPA, bar (Fluid to Air) gpm lpm
2:1 231908 231847 231876 2320 16, 160 100 0.7, 7 2900 20, 200 23.2 2.7 10.1
2:1 231910 231849 231878 3000 21, 207 86 0.6, 6 3600 25, 248 34.7 1.8 6.7
3:1 231912 231851 231880 2610 18, 180 100 0.7, 7 2900 20, 200 26.1 2.4 8.9
4:1 231915 231854 231883 2780 19, 192 100 0.7, 7 2900 20, 200 27.8 2.2 8.4

308225 7
Typical Installation
About the Typical Installations
These pumps are designed to be part of a Hydra-Cat
dispensing system that will proportion, mix, and
dispense two-component fluids. The typical installa-
tions shown below and on page 8 are only guidelines
to setting up a complete proportioning system. For
clarity, various components are shown in the correct
order but may not be shown in the exact position of the
installed system. For assistance in designing your
system, contact your nearest Graco representative.
NOTE: When pressure feeding the proportioning
pump, mount fluid pressure gauges (J) at the propor-
tioning pump inlets to monitor proper adjustment of the
feed pump pressures. Never exceed 25% of the
Hydra-Cat pump outbound fluid pressure on the feed
supply.
Light Viscosity System
Two Displacement Pumps,
5:1 Ratio Feed Pumps
1See note above
Connect to drain bottle.
See Fig. 5, page 11
2
KEY
A Bleed-type master
air valve
B Air filter
C Air lubricator
D Pump runaway valve
E Pump air regulator
F Feed pump
G Ground wire
H Proportioning pump
J Fluid pressure gauge
K Check valve
L Automatic pressure relief
valve
M Fluid filter
N Mixer manifold
P Fluid drain valve
Q Fluid shutoff valve
R Static mixer
S Dispense valve
T Fluid regulator
U Solvent pump
V Fluid strainer
* Included with wall or stand models
Fig. 1
BA
FG
A
E
HK* L*
M
N*
P*
Q
R
Q*
K
S
M
J*
T
Q*
A*E*
V*
U
1
02911
2
HARDENER RESIN
RES
HARD
RES
HARD
C
D

3082258
Typical Installation
About the Typical Installations
These pumps are designed to be part of a Hydra-Cat
dispensing system that will proportion, mix, and
dispense two-component fluids. The typical installation
iss shown below and on page 7 are only a guidelines
to setting up a complete proportioning system. For
clarity, various components are shown in the correct
order but may not be shown in the exact position of the
installed system. For assistance in designing your
system, contact your nearest Graco representative.
NOTE: When pressure feeding the proportioning
pump, mount fluid pressure gauges (J) at the propor-
tioning pump inlets to monitor proper adjustment of the
feed pump pressures. Never exceed 25% of the
Hydra-Cat pump outbound fluid pressure on the feed
supply.
Heavy Viscosity Heated System
Three Displacement Pumps,
10:1 Ratio Feed Pumps
1
2
See note above
Connect to drain bottle.
See Fig. 5, page 11
KEY
A Bleed-type master air valve
B Air filter
C Air lubricator
D Pump runaway valve
E Pump air regulator
F Feed pump
G Ground wire
H Proportioning pump
J Fluid pressure gauge
K Check valve
L Automatic pressure
relief valve
M Fluid filter
N Mixer manifold
P Fluid drain valve
Q Fluid shutoff valve
R Static mixer
S Dispense valve
T Fluid regulator
U Solvent pump
V Fluid strainer
W Fluid heater
X Supply manifold
* Included with wall or stand models
02912
Fig. 2
D
B
A
C
FG
A
E
2
HJ* K* L* M
N**
P**
Q
R
Q**
K
S
M
J*
T
Q*
A*E*
V*
U
1
W
X*
2

308225 9
Installation
Bare Pumps
Bare pumps are available for those installations which
require a highly customized system. For a safe and
efficient system, Graco recommends that the air and
fluid components supplied with the Wall Mount and
Cart Mount models also be used in customized
systems. Refer to the Parts Drawings starting on page
28 for part numbers. In addition, the accessories
shown in the Typical Installation drawings and
discussed in the following pages of this manual should
be used.
Be sure all accessories are sized properly for the air
and fluid requirements of your system.
Read all instructions in the Installation section for
further details.
NOTES:
1. Models with three displacement pumps always use
the two outer displacement pumps to supply the
resin and the middle displacement pump to supply
the hardener.
2. Label all pumps, hoses, fluid regulators, etc. to
indicate whether they are for the resin side or
hardener side of the system.
Mounting the Pump
Mount the pump to suit your installation. The bare
pump can be mounted on a wall bracket or on a cart.
See Dimensions on page 43. The Bulldog pump and
accessories weigh approximately 115 lb (52 kg). The
pump stand and accessories weigh 55 lb (25 kg).
For a wall mount, be sure the bracket and wall are
strong enough to support the pump, accessories,
plumbing and stress caused by pump operation.
Locate the bracket about 5 ft (1.5 m) above the floor.

30822510
Installation
Grounding
WARNING
FIRE AND EXPLOSION HAZARD
Improper grounding could cause static
sparking, which could cause a fire or
explosion. To reduce the risk of property
damage or serious injury, follow the
grounding instructions below.
The following grounding instructions are minimum
requirements for a system. Your system may include
other equipment or objects which 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.
1. Pump:
a. Loosen the grounding lug locknut (BB) and
washer (AA).
b. Insert one end of a 14 ga. (1.5 mm@) minimum
ground wire (G) into the slot in lug (CC) and
tighten the locknut securely. See Fig. 3.
c. Connect the other end of the ground wire to a
true earth ground. Order part number 237569
grounding clamp wire.
Fig. 3
G
BB AA
CC
2. Air hoses: use only grounded hoses with a maxi-
mum of 500 feet (150 m) combined hose length to
ensure grounding continuity.
3. Fluid hoses: use only grounded fluid hoses.
4. Air compressor: follow manufacturer’s recom-
mendations.
5. Spray gun or dispensing valve: grounding is
obtained through connection to a properly
grounded fluid hose and pump.
6. Fluid supply container: according to local code.
7. Object being sprayed: according to your local
code.
8. All solvent pails used when flushing,according
to local code. Use only metal pails, which are con-
ductive, placed on a grounded surface. Do not place
the pail on a nonconductive surface, such as paper
or cardboard, which interrupts the grounding continu-
ity.
9. To maintain grounding continuity when flush-
ing or relieving pressure,always hold a metal
part of the dispensing unit firmly to the side of a
grounded metal pail, then trigger the dispensing
unit.

308225 11
Installation
Air Control Accessories
Install the accessories in the order shown in Fig. 4.
Mount only the air regulator (E) and a master air valve
(A) at the pump. Mount all other accessories on sepa-
rate wall brackets to reduce stress on the pump inlet.
Note that one air filter (B) can serve multiple pumps by
using an air manifold downstream from the air filter.
WARNING
INJECTION HAZARD
Bleed-type master air valves (A) are required in the
system in the positions shown in the Typical Instal-
lation drawings. These valves are used during
system pressure relief to relieve air trapped in the
air line. Trapped air can cause the pump to cycle
unexpectedly and result in serious injury from
moving parts, fluid injection, or fluid splashing.
02887
Fig. 4
D
BA
C
G
A
E
1. Install a bleed-type master air valve (A) in the
pump air inlet.
2. Install an air regulator and gauge (E) to control
pump outlet pressure.
3. Install a pump runaway valve (D) for each feed
pump to automatically shut off the air to the pump
if the pump accelerates beyond the pre-adjusted
setting. A pump which runs too fast can be seri-
ously damaged.
4. Install an air line lubricator (C) for automatic air
motor lubrication.
5. Install an air filter (B) to remove harmful dirt and
moisture from the compressed air supply.
Automatic Pressure Relief Valves
WARNING
COMPONENT RUPTURE HAZARD
To reduce the risk of component rupture,
which could cause serious injury and
property damage, the appropriate auto-
matic pressure relief valve (18) is required for
each fluid on a plural component pump.
These valves automatically relieve fluid pressure if
the pump output pressure exceeds the valve’s
preset pressure. Over-pressurization may occur if
there is a fluid line clog upstream from the valve or
if any other condition exists that causes one of the
pumps to cavitate and direct all fluid pressure to
the other pump(s).
See the Model Chart on page 6 to determine the
preset pressure in your system.
Fig. 5
38h
38g
38f
38a
38b
38c
02888A
18
NOTE: Item 38, Drainage Bottle
Kit, includes items 38a–38h

30822512
Installation
Automatic Pressure Relief Valves
(continued)
Two drainage bottle kits (38) are included with wall
models (unassembled) and stand mount models
(assembled) to catch the drainage if the automatic
pressure relief valves (18) open.
For the wall mount models, assemble the kit as shown
in Fig. 5, page 11, and mount it securely to a wall or
bracket. Use the tie wrap, supplied, to hold the hoses
out of the way if necessary.
WARNING
INJECTION HAZARD
Fluid emitted from the automatic pressure drain
valves may be at pressures over 3000 psi (21
MPa, 207 bar). To reduce the risk of serious injury
from fluid injection or fluid splashing, make sure the
drain bottles are securely fastened to the frame or
wall so that they can handle a sudden spurt of
pressurized fluid.
Connect Fluid Supply Hoses
NOTE: If you mount the pump on a wall, turn the
displacement pump inlet assemblies (CC) to face
forward, rather than backwards as shown in Fig. 76.
For Two Displacement Pump Models
1. Connect the resin supply hose (EE) to the 3/4 npt
swivel inlet (37B) for the resin displacement pump.
See Fig. 6.
2. Connect the hardener supply hose (DD) to the
3/4 npt swivel inlet (37A) for the hardener displace-
ment pump. See Fig. 6.
For Three Displacement Pump Models
1. Connect the resin supply hose (EE) to the 3/4 npt
swivel inlet (37B) for the resin displacement
pumps. See Fig. 7.
2. Connect the hardener supply hose (DD) to the 3/4
npt swivel inlet (37) for the center (hardener)
displacement pump. See Fig. 7.
Additional System Components
Install and connect the feed pumps, solvent pump,
heaters, etc. Refer to the Typical Installations page 7
and Accessories on pages 40 and 41 for parts informa-
tion.
Use a dry air kit or a nitrogen regulator kit to protect
the fluid in the supply containers from moisture that
can crystallize the fluid and cause the ball checks to
malfunction. See Accessories on page 41.
Fig. 6
DD
EE
CC
RES
HARD
02889
37B
37A
Fig. 7
DD
EE
HARD
37B
37A
02890
RES
RES

308225 13
Installation – Optional Fluid Heaters
Fig. 8
201
202
203
204
10
201a
201b
IN
OUT
02913A
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
follow the Pressure Relief Procedure
on page 19 before installing the heaters.
All Models
NOTE: For systems requiring one heater for each
fluid, see page 40 to order the heaters and required
plumbing (items 201 to 205).
1. Mount a heater to each side of the mounting
bracket using the three screws (201a) and lock-
washers (201b) supplied with each heater. See
Fig. 8.
2. Connect a swivel union (202) to the outlet of each
heater. See Fig. 8.
3. Connect a swivel union (203) to the inlet of each
heater. See Fig. 8.
For Two Displacement Pump Models
1. Disconnect the existing hardener hose (10B) from
the inlet of the mixer manifold (23). See Fig. 8.
Connect the free end of the hose to the swivel
(203) at the hardener heater inlet. See Fig. 9.
2. Install a new fluid hose (204B) between the hard-
ener heater outlet (202B) and the hardener mixer
manifold. See Fig. 8 and 9.
3. Repeat Steps 1 and 2 for the resin pump (the
“A” side).
See Three Displacement Pump Models on next page.
RES HARD
RES
RES HARD
HARD
RES
HARD
Fig. 9
202A 202B
203B203A
23
02893
204B
204A
10B10A
IN IN
OUT
OUT

30822514
Installation – Optional Fluid Heaters
IN
OUT
RES
HEATER
IN
OUT
HARD
HEATER
RES
HARD
RES
RES HARD
RES HARD
Fig. 10
17A 17B
202A 202B
203B203A
23
204B
205A
FA FB
02894
For Three Displacement Pump Models
NOTE: You must provide two hoses (FA, FB in Fig.10)
and fittings to run from the heater outlets to the mixer
manifold inlets.
NOTE: To accommodate two resin fluid hoses, the
mixer manifold (23) must be disconnected from the
bracket and mounted remotely.
1. Loosen the swivel of the unions (17A, 17B) to
remove the elbow (16A, 16B) on each side of the
mixer manifold (23). Turn the unions (17A, 17B) so
the outlet faces up. See Fig. 10 and 11.
2. Connect a new hardener fluid hose (204B)
between the union (17B) and the swivel (203B) at
the heater inlet. See Fig. 10.
3. Install another hardener fluid hose (FB) between
the heater outlet elbow (202B) and the hardener
side of the mixer manifold (23). See Fig. 10.
4. Repeat Steps 1 to 3 for the resin side of the
system (the “A” side).
02892A
Fig. 11
16B
16A
17B
17A
23
RES
HARD

308225 15
Installation – Optional Solvent Pump
NOTE: The optional solvent pump is not offered as a
kit; order parts as needed. The optional parts shown
here are listed on page 41. These instructions assume
that the pump is being mounted to the back of the
stand offered in this manual. The Typical Installations
on pages 7 and 8 shows an alternate installation.
Adjust your installation according to your specific
needs.
1. Mount the solvent pump bracket (310) on the back
of the stand.
2. Mount the pump (306) to the bracket using the
hardware supplied with the pump.
3. Use the existing proportioning pump air regulator
(5) to supply air to the solvent pump. Remove the
plug from the back of the swivel union (3) and
install the adapter (301). Rotate the regulator
gauge elbow (4) so the gauge is facing the opera-
tor.
4. Couple the hose (303) and couplings (302).
Connect the hose (303) to the adapter (301).
5. Install the other adapter (301), needle valve (304)
and adapter (305) to the pump inlet.
6. Connect the adapter (307), elbow (308) and fluid
hose (309) to the pump outlet.
7. Install a fluid shutoff valve (311) at the mixer
manifold swivel union (15). This valve is used to
prevent resin or hardener from backing up into the
solvent system, and to isolate the solvent system
for service. Connect the solvent inlet hose (309).
8. Connect the suction hose assembly (312) to the
pump intake.
309
310
312
308
307
305
303
301
304
314
313
301
309
311
15
306
316
315
Fig. 12
302,
303
302
5
4
3
A
B
02902B
B
A

30822516
Flushing
When to Flush the System
DFlush the system before its first use to remove the
light oil which was left in after factory testing.
DFlush the manifold mixer (N), using the solvent
pump, as frequently during the day as necessary to
avoid exceeding the pot life limit of the material
being pumped.
DFlush frequently enough during regular operation to
prevent clogged passages due to material being
overheated or dried out in any part of the system.
Clogged passages in the heater can be very difficult
to clean and can reduce heating efficiency, flow rate
and pressure.
DFlush the entire system when the system is shut
down for a long period of time. Keep in mind that
some moisture may get into the lines, which could
contaminate the hardener, so flush again before
restarting the system.
How to Operate the Mixer Manifold
To open or close the mixer manifold fluid valves (LL)
push the handle (KK) down to open and up to close.
See Fig. 13.
Fig. 13
1
2
UP – closed
DOWN – open
1
2
KK
LL
LL
N2
N1
N
P2
P1
02895
RES
HARD
02914
Fig. 14
A3
E3
A2
E2
H
J1 J2
KEY
A Bleed-type master air valve
A1 Hardener feed pump
A2 Resin feed pump
A3 Proportioning pump
A4 Solvent pump
A5 Feed and Proportioning pump master
air valve
A6 Solvent pump master air valve
E Pump air regulator
E1 Hardener feed pump
E2 Resin feed pump
E3 Proportioning pump
E4 Solvent pump
J Fluid pressure gauge
J1 Proportioning pump intake
J2 Proportioning pump outlet
H Proportioning pump
N Mixer manifold
Q Fluid shutoff valve
Q1 Proportioning pump intake
Q2 Mixer manifold solvent inlet
A1
E1
A5 A6
A4
E4
N
Q2
Q1

308225 17
Flushing
How to Flush the System
WARNING
HOT SURFACE HAZARD
If your system is equipped with heaters,
always shut off the main power to the
heaters before flushing. Circulate the
fluid through the system for at least 10 minutes to
cool the fluid and the heater. This reduces the risk
of serious injury from burns.
NOTE: For the first time flushing, we recommend
using mineral spirits solvent (also called white spirit) to
flush out the oil. Then flush again using a solvent that
is compatible with the fluid you will be dispensing.
However, be sure the mineral spirits solvent is compat-
ible with the material you will be pumping. If it is not,
check with your fluid supplier to determine an
appropriate solvent for flushing out the light oil.
For flushing only . . .
NOTE: The proportioning pump is not operated during
flushing. The solvent from the feed pumps will flush the
proportioning pump displacement pumps.
1. Place each feed pump intake into a separate 5
gallon grounded pail, containing about 3 gallons
(12 liters) of solvent.
To flush or prime . . .
2. Be sure both of the fluid shutoff valves (Q1) are
open. See Fig. 14.
3. Place a container under the drain valves (P1,P2)
of the mixer manifold (N). See Fig. 13.
4. Be sure the feed pump air regulators (E1,E2) are
at minimum pressure. See Fig. 14.
5. Open the main master air valve (A5). See Fig.14.
6. Open the hardener pump master air valve (A1).
See Fig. 14.
7. Slowly increase the air regulator (E1) setting until
the pump is running slowly.
8. Open the hardener side drain valve (P1). Open the
mixer manifold handle (KK). See Fig. 13.
9. When the hardener lines are flushed, close the
mixer manifold handle and close the drain valve
(P1). Close the air valve (A1). See Fig.14.
10. Repeat Steps 6 to 9 for the resin feed pump. The
resin sides uses these parts: regulator (E2), air
valve (A2), drain valve (P2).
To flush the solvent valves . . .
11. Open the hardener solvent flush valve (N1) on the
mixer manifold (N). See Fig. 13.
a. Be sure the solvent pump air regulator (E4) is
at minimum pressure. See Fig.14.
b. Open the solvent pump main master air valve
(A6) and then open the pump air valve (A4).
See Fig. 14.
c. Release the dispensing valve safety latch.
Hold the dispensing valve firmly against a
grounded pail and trigger it while slowly
opening the solvent pump air regulator (E4).
Operate the pump slowly until the dispense
line is flushed. Release the dispensing valve
trigger and engage its safety latch. Close the
hardener solvent flush valve (N1).
d. Open the resin solvent flush valve (N2) and
repeat Step c, above. See Fig. 13.
e. Close the solvent line shutoff valve (Q2). See
Fig.14.
CAUTION
Always close the solvent line fluid shutoff valve (Q2)
after the flushing procedure has been completed.
This will prevent the other fluids from leaking into the
flushing line.

30822518
Flushing
If this is a first time flush . . .
12. Repeat the flushing procedure using a solvent
compatible with the fluid you are going to
dispense.
When you are done flushing . . .
13. Remove the solvent supply from the feed pumps.
Operate the pumps slowly to push all the solvent
out of the lines, then stop the pumps.
If you are not going to use the system . . .
14. Close all air regulators, master air valves and fluid
shutoff valves. Follow the Pressure Relief Proce-
dure on page 19.
WARNING
INJECTION HAZARD
To reduce the risk of serious injury from fluid injec-
tion or fluid splashing, always close the air valve
(A4) to the solvent pump before opening the fluid
drain valves (P2) to relieve system pressure. This
will reduce the risk of excessive pressure buildup in
the opposite component hose and fittings.

308225 19
Operation
Pressure Relief Procedure
WARNING
INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure if the
spray tip/nozzle clogs and whenever you:
Dare instructed to relieve the pressure,
Dstop spraying,
Dcheck or service any of the system equipment,
Dor install or clean the spray tip.
1. Engage the dispensing valve safety latch.
2. Shut off the feed pump and proportioning pump air
regulators and bleed-type master air valves.
3. If the system has heaters, circulate the fluid for at
least 10 minutes to cool the heated fluid and
heater.
4. Disengage the dispensing valve safety latch.
5. Hold a metal part of the dispensing valve firmly to
the side of a grounded metal pail, and trigger the
dispensing valve to relieve pressure.
6. Engage the safety latch.
7. Open the mixer manifold drain valves (required in
your system), having a container ready to catch
the drainage. Close the valves immediately.
8. Use the solvent pump to flush the mixer manifold
solvent valves.
9. If you suspect that the nozzle or hose is com-
pletely clogged, or that pressure has not been fully
relieved after following the steps above, very
slowly loosen the nozzle or hose end coupling and
relieve pressure gradually, then loosen completely.
Now clear the nozzle or hose.
Handling Plural Component Fluid
WARNING
PLURAL COMPONENT FLUID
HAZARD
Be extremely cautious when handling
plural component materials and solvents
used with them. Some are extremely
toxic. See the Toxic Fluid Hazard warnings on
page 3. Read and follow the coating and solvent
manufacturer’s safety precautions and warnings.
Wear the proper protective clothing, eye protection,
gloves, and clean air breathing apparatus as
prescribed by the fluid manufacturers recommen-
dations, O.S.H.A. regulations and as approved by
N.O.I.S.H. for the chemicals being used.
Observe the Pot Life Limit
Flush the mixed fluid out of the mixer, dispensing lines
and equipment before it hardens. Flush the complete
system when necessary to prevent the fluids from
hardening in the equipment and hoses. Check the fluid
manufacturer’s instructions for fluid shelf life, and flush
the entire system before this time is reached. Flush the
system with a compatible solvent as explained on page
17.
Fill the Throat Packing Nuts
Keep each displacement pump throat packing nut (JJ)
filled with Graco ISO Pump Oil to help prevent fluid
from drying on the displacement rod and damaging the
pump packings. See Fig. 15.
Verify compatibility of the pump oil with the fluids being
used in the pumps. During operation very small
amounts of this fluid are dragged past the seals and
into the pump.
Fig. 15
JJ
02897

30822520
Operation
Check the Drainage Bottles and Hoses
WARNING
INJECTION HAZARD
To reduce the risk of serious injury and property
damage, regularly check and clean the drain hose
and bottle for the automatic pressure relief valve.
If material is allowed to dry in and clog the drain
hose, the automatic pressure relief valve may not
fully release the fluid pressure if it opens or may
cause the drain hose to burst.
Check the drain hose and bottle (38) at the start of
each shift, and whenever there is an imbalance of
material, to see if the automatic pressure drain valve
has released material into the bottles. Clean the hose
and bottle as needed. Regularly check the drain hose
for cuts, leaks, or bulges and replace damaged
components before using the system. See Fig. 16.
Fig. 16
38
02948A
Monitor the Material Supply
CAUTION
Establish a rigid system for monitoring the material
supply to prevent the pumps from running dry. A
sudden lack of material in one pump may cause
many system problems, including air entrapment,
spitting of the fluids, fluid “crossovers”, pump
damage, downtime, and added system stresses.
Never allow the feed pump or solvent pump containers
to run dry. A dry container allows air to be pumped into
the system and causes incorrect proportioning. A dry
pump will quickly accelerate to a high speed, and may
damage itself and the other displacement pump be-
cause it causes a pressure rise in the other pump. If a
supply container becomes dry, stop the pump immedi-
ately, refill the container, and prime the system. Be
sure to eliminate all the air from the system.
NOTE: The pump runaway valve mentioned on page
11 of the Installation section shuts off the pump if the
pump speed accelerates quickly.