Graco 237286, 237287 User Manual

Instructions – Parts List

STAINLESS STEEL

Dura–Flo 900t Pumps

With Severe–Duty Rod and Cylinder

U.S. Patent No. 5,456,583
Foreign Patents Pending

Important Safety Instructions

Read all warnings and instructions in this manual.
Save these instructions.

See page 2 for model numbers and maximum
working pressures.

Model 237286

308354H

Model 237287

04143B

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

Copyright 2002, Graco Inc. is registered to I.S. EN ISO 9001

04275B

List of Models

Pump Part No.
and Series Pump Model Ratio

237286,
Series B

237287,
Series A

237280,
Series A

245172,
Series A

245173,
Series B

237290,
Series A

248817,
Series A

Reduced Icing Quiet King 56:1 38.6 MPa, 386 bar

Bulldog 28:1 19.3 MPa, 193 bar

Senator 17:1 11.7 MPa, 117 bar

King 56:1 38.6 MPa, 386 bar

Quiet King 56:1 38.6 MPa, 386 bar

Viscount II
(hydraulic)

Viscount II
(hydraulic)

3.5:1 34 MPa, 345 bar

3.5:1 34 MPa, 345 bar

Table of Contents

Maximum Fluid
Working Pressure

(5600 psi)

(2800 psi)

(1700 psi)

(5600 psi)

(5600 psi)

(5000 psi)

(5000 psi)

Symbols

Maximum Air
Input Pressure

0.7 MPa, 7 bar
(100 psi)

0.7 MPa, 7 bar
(100 psi)

0.7 MPa, 7 bar
(100 psi)

0.7 MPa, 7 bar
(100 psi)

0.7 MPa, 7 bar
(100 psi)

9.9 MPa, 99 bar
(1428 psi)
hydraulic pressure

9.9 MPa, 99 bar
(1428 psi)
hydraulic pressure

Warnings 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operation/Maintenance 10. . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting Chart 15. . . . . . . . . . . . . . . . . . . . . . . . .

Service 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Required Tools 16. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Disconnecting the Displacement Pump 16. . . . . . .

Reconnecting the Displacement Pump 16. . . . . . . .

Displacement Pump Service 18. . . . . . . . . . . . . . . .

Parts Drawings and Parts Lists 22. . . . . . . . . . . . . . . . . .

Pump Assemblies 22. . . . . . . . . . . . . . . . . . . . . . . . . .

Displacement Pump 26. . . . . . . . . . . . . . . . . . . . . . . .

Technical Data 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dimensions 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mounting Hole Layout 33. . . . . . . . . . . . . . . . . . . . . . . . . .

Warranty 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Graco Information 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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.

2 308354

INSTRUCTIONS

WARNING

EQUIPMENT MISUSE HAZARD

Equipment misuse can cause the equipment to rupture or malfunction and result in serious injury.

 This equipment is for professional use only.

 Read all instruction manuals, tags, and labels before operating the equipment.

 Use the equipment only for its intended purpose. If you are not sure, contact your Graco distributor.

 Do not alter or modify this equipment.

 Check equipment daily. Repair or replace worn or damaged parts immediately.

 Do not exceed the maximum working pressure of the lowest rated system component. Refer to the

Technical Data on pages 28–30 for the maximum working pressure of this equipment.

 Use fluids and solvents which are compatible with the equipment wetted parts. Refer to the Tech-

nical Data section of all equipment manuals. Read the fluid and solvent manufacturer’s warnings.

 Do not use hoses to pull equipment.

 Route hoses away from traffic areas, sharp edges, moving parts, and hot surfaces. Do not expose

Graco hoses to temperatures above 82C (180F) or below –40C (–40F).

 Wear hearing protection when operating this equipment.

 Do not lift pressurized equipment.

 Comply with all applicable local, state, and national fire, electrical, and safety regulations.

308354 3

WARNING

SKIN INJECTION HAZARD

Spray from the gun, leaks or ruptured components can inject fluid into your body and cause extremely
serious injury, including the need for amputation. Fluid splashed in the eyes or on the skin can also
cause serious injury.

 Fluid injected into the skin might look like just a cut, but it is a serious injury. Get immediate surgi-

cal treatment.

 Do not point the gun at anyone or at any part of the body.

 Do not put your hand or fingers over the spray tip.

 Do not stop or deflect leaks with your hand, body, glove or rag.

 Do not “blow back” fluid; this is not an air spray system.

 Always have the tip guard and the trigger guard on the gun when spraying.

 Check the gun diffuser operation weekly. Refer to the gun manual.

 Be sure the gun trigger safety operates before spraying.

 Lock the gun trigger safety when you stop spraying.

 Follow the Pressure Relief Procedure on page 10 if the spray tip clogs and before cleaning,

checking or servicing the equipment.

 Tighten all fluid connections before operating the equipment.

 Check the hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.

Do not repair high pressure couplings; you must replace the entire hose.

 Fluid hoses must have spring guards on both ends, to help protect them from rupture caused by

kinks or bends near the couplings.

MOVING PARTS HAZARD

Moving parts, such as the air motor piston, can pinch or amputate your fingers.

 Keep clear of all moving parts when starting or operating the pump.

 Before servicing the equipment, follow the Pressure Relief Procedure on page 10 to prevent the

equipment from starting unexpectedly.

4 308354

WARNING

FIRE AND EXPLOSION HAZARD

Improper grounding, poor ventilation, open flames or sparks can cause a hazardous condition and
result in a fire or explosion and serious injury.

 Ground the equipment and the object being sprayed. Refer to Grounding on page 6.

 If there is any static sparking or you feel an electric shock while using this equipment, stop spray-

ing immediately. Do not use the equipment until you identify and correct the problem.

 Provide fresh air ventilation to avoid the buildup of flammable fumes from solvents or the fluid

being sprayed.

 Keep the spray area free of debris, including solvent, rags, and gasoline.

 Electrically disconnect all equipment in the spray area.

 Extinguish all open flames or pilot lights in the spray area.

 Do not smoke in the spray area.

 Do not turn on or off any light switch in the spray area while operating or if fumes are present.

 Do not operate a gasoline engine in 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.

 Know the specific hazards of the fluid you are using.

 Store hazardous fluid in an approved container. Dispose of hazardous fluid according to all local,

state and national guidelines.

 Always wear protective eyewear, gloves, clothing and respirator as recommended by the fluid and

solvent manufacturer.

308354 5

Installation

General Information

NOTE: Reference numbers and letters in parentheses

in the text refer to the callouts in the figures and the
parts drawing.

NOTE: Always use Genuine Graco Parts and Acces­sories, available from your Graco distributor. Refer to
Product Data Sheet, Form No. 305715 (Senator
Pumps), Form No. 305716 (Bulldog Pumps), and Form
No. 305717 (King Pumps). If you supply your own
accessories, be sure they are adequately sized and
pressure rated for your system.

Grounding

WARNING

FIRE AND EXPLOSION HAZARD

Before operating the pump, ground the
system as explained below. Also read
the section FIRE OR EXPLOSION HAZ-
ARD on page 5.

1. King Pumps: use a ground wire and clamp. See

Fig. 1. Remove the ground screw (Z) and insert

through eye of ring terminal at the end of ground

wire (Y). Fasten ground screw back onto pump

and tighten securely. Connect the other end of

ground wire to a true earth ground. Order Part No.

222011 Ground Wire and Clamp.

W

X

Y

Z

0864

Fig. 2

2. Air and fluid hoses: use only electrically conductive
hoses.

3. Air compressor: follow manufacturer’s recommen­dations.

4. Spray gun: ground through connection to a prop­erly grounded fluid hose and pump.

5. Fluid supply container: follow your local code.

6. Object being sprayed: follow your local code.

7. Solvent pails used when flushing: follow your local
code. Use only metal pails, which are conductive,
placed on a grounded surface. Do not place the
pail on a nonconductive surface, such as paper or
cardboard, which interrupts the grounding continu­ity.

8. To maintain grounding continuity when flushing or
relieving pressure, hold a metal part of the spray
gun firmly to the side of a grounded metal pail,
then trigger the gun.

System Accessories

All Other Pumps: use a ground wire and clamp.
See Fig. 2. Loosen the grounding lug locknut (W)
and washer (X). Insert one end of a 1.5 mm (12
ga) minimum ground wire (Y) into the slot in lug (Z)
and tighten the locknut securely. Connect the other
end of the wire to a true earth ground. Order Part
No. 237569 Ground Wire and Clamp.

Z

Fig. 1

6 308354

Y

TI1052

Fig. 3 is only a guide for selecting and installing sys­tem components and accessories. Contact your Graco
distributor for assistance in designing a system to suit
your particular needs.

Air and Fluid Hoses

Be sure all air hoses (H) and fluid hoses (N and P) are
properly sized and pressure-rated for your system.
Use only electrically conductive hoses. Fluid hoses
must have spring guards on both ends. Use a whip
hose (P) and a swivel (R) between the main fluid hose
(N) and the gun (S) to allow freer gun movement.

Mounting Accessories

Mount the pump (A) to suit the type of installation
planned. Fig. 3 illustrates a wall mount system. Pump
dimensions and the mounting hole layout are shown
on page 33.

If you are using a floor stand, refer to its separate
manual for installation and operation instructions.

Installation

System Accessories (continued)

WARNING

A bleed-type master air valve (E) and a fluid drain
valve (M) are required in your system. These
accessories help reduce the risk of serious injury,
including fluid injection and splashing of fluid in the
eyes or on the skin, and injury from moving parts if
you are adjusting or repairing the pump.

The bleed-type master air valve relieves air trapped
between this valve and the pump after the air is
shut off. Trapped air can cause the pump to cycle
unexpectedly. Locate the valve close to the pump.
Order Part No. 107141.

A fluid drain valve (M) helps reduce the risk of
serious bodily injury, including fluid injection and
splashing of fluid in the eyes or on the skin, and
injury from moving parts if you are adjusting or
repairing the pump.

The fluid drain valve assists in relieving fluid pres­sure in the displacement pump, hose, and gun.
Triggering the gun to relieve pressure may not be
sufficient. Order Part No. 210658.

Air Line Accessories

Install the following accessories in the locations shown
in Fig. 3, using adapters as necessary:

 An air line lubricator (D) provides automatic air

motor lubrication.

 A pump runaway valve (C) senses when the

pump is running too fast and automatically shuts
off the air to the motor. A pump which runs too fast
can be seriously damaged.

 An air manifold (G) has a 3/4 npsm(f) swivel air

inlet. It mounts to the pump support bracket, and
provides ports for connecting lines to air-powered
accessories.

 An air line filter (J) removes harmful dirt and

moisture from the compressed air supply. Also,
install a drain valve (W) at the bottom of each air
line drop, to drain off moisture.

 A second bleed-type air valve (K) isolates the air

line accessories for servicing. Locate upstream
from all other air line accessories.

Fluid Line Accessories

Install the following accessories in the locations shown
in Fig. 3, using adapters as necessary:

 A fluid filter (L) with a 60 mesh (250 micron)

stainless steel element, to filter particles from the
fluid as it leaves the pump.

 A fluid drain valve (M), which is required in your

system, helps relieve fluid pressure in the hose
and gun (see the WARNING at left).

 A gun (S) dispenses the fluid. The gun shown in

Fig. 3 is an airless spray gun for light to medium
viscosity fluids.

 A bleed-type master air valve (E) is required in

your system to relieve air trapped between it and
the air motor when the valve is closed (see the
WARNING above). Be sure the bleed valve is eas­ily accessible from the pump, and is located
downstream from the air regulator.

 An air regulator (F) controls pump speed and out-

let pressure by adjusting the air pressure to the
pump. Locate the regulator close to the pump, but
upstream from the bleed-type master air valve.

 A gun swivel (R) allows freer gun movement.

 A suction kit (T) allows the pump to draw fluid

from a supply container.

CAUTION

To prevent intake valve damage, always apply PTFE
tape to the female threads of the intake valve before
connecting a suction hose or fitting to the intake.

308354 7

Installation

KEY
A Pump

B Wall Bracket
C Pump Runaway Valve
D Air Line Lubricator
E Bleed-Type Master Air Valve

(required, for pump)

F Pump Air Regulator
G Air Manifold

TYPICAL INSTALLATION

H Electrically Conductive Air Supply Hose
J Air Line Filter
K Bleed-Type Master Air Valve

(for accessories)

L Fluid Filter
M Fluid Drain Valve (required)
N Electrically Conductive

Fluid Supply Hose

JK

MAIN AIR LINE

D

E

P Fluid Whip Hose
R Gun Swivel
S Airless Spray Gun
T Suction Kit
Y Ground Wire and Clamp

(required; see page 6
for installation instructions)

W Air Line Drain Valve

Y

A

S

W

F

C

G

B

H

R

P

L

N

M

T

Fig. 3

8 308354

04177B

Installation

(HYDRAULIC-POWERED PUMPS)

Fluid Line Accessories

Install the following accessories in the locations shown
in Fig. 4, using adapters as necessary:

 A fluid filter (L) with a 60 mesh (250 micron)

stainless steel element, to filter particles from the
fluid as it leaves the pump.

 A fluid drain valve (M), which is required in your

system, helps relieve fluid pressure in the hose
and gun (see the WARNING on page 7).

KEY
A Pump

B Wall Bracket
C Hydraulic Supply Line
D Hydraulic Return Line
E Drain Line (from pressure reducing valve)
F Pressure Gauge
G Flow Control Valve
H Pressure Reducing Valve
J Accumulator
K Drain Line (from motor drip pan)
L Fluid Filter
M Fluid Drain Valve (required)
N Electrically Conductive

Fluid Supply Hose

P Fluid Whip Hose
R Gun Swivel
S Airless Spray Gun
T Drum Suction Kit
U Hydraulic Supply Line Shutoff Valve
V Hydraulic Return Line Shutoff Valve
Y Ground Wire (required, see page 6 for

installation instructions)

AA Hydraulic Return Line Filter

TYPICAL HYDRAULIC-POWERED INSTALLATION

HJ

E

G

 A gun (S) dispenses the fluid. The gun shown in

Fig. 4 is an airless spray gun for light to medium
viscosity fluids.

 A gun swivel (R) allows freer gun movement.

 A suction kit (T) allows the pump to draw fluid

from a supply container.

F

V

S

A

Y

R

U

P

L

B

N

HYDRAULIC
POWER SUPPLY

Fig. 4

C

AA

DRAINAGE
CONTAINER

M

D

K

200 LITER (55 GAL.)
DRUM

T

04582B

308354 9

Operation/Maintenance

Pressure Relief Procedure

WARNING

SKIN 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
whenever you:

 are instructed to relieve the pressure,
 stop spraying,
 check or service any of the system equipment,
 or install or clean the spray tips.

1. Lock the gun/valve trigger safety.

2. Shut off the air supply to the pump.

3. Close the bleed-type master air valve (required in
your system).

Packing Nut/Wet-Cup

Before starting, fill the packing nut (2) 1/3 full with
Graco Throat Seal Liquid (TSL) or compatible solvent.
See Fig. 5.

WARNING

To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure at left.

The packing nut is torqued at the factory and is ready
for operation. If it becomes loose and there is leaking
from the throat packings, relieve the pressure, then
torque the nut to 136–149 N.m (100–110 ft-lb) using
the supplied wrench (110). Do this whenever neces­sary. Do not overtighten the packing nut.

Model
237287
Shown

4. Unlock the gun/valve trigger safety.

5. Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the gun to relieve
pressure.

6. Lock the gun/valve trigger safety.

7. Open the drain valve (required in your system),
having a container ready to catch the drainage.

8. Leave the drain valve open until you are ready to
spray again.

If you suspect that the spray tip or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above, very slowly loosen the

tip guard retaining nut or hose end coupling and relieve
pressure gradually, then loosen completely. Now clear
the tip or hose.

Fig. 5

21

1

110

Torque to 136–149
(100–110 ft-lb)

04143B

10 308354

Operation/Maintenance

Flush the Pump Before First Use

The pump is tested with lightweight oil, which is left in
to protect the pump parts. If the fluid you are using
may be contaminated by the oil, flush it out with a
compatible solvent. See Flushing on page 12.

Starting and Adjusting the Pump

1. See Fig. 3. Connect the suction kit (T) to the
pump’s fluid inlet. Place the tube into the fluid
supply.

CAUTION

To prevent intake valve damage, always apply PTFE
tape to the female threads of the intake valve before
connecting a suction hose or fitting to the intake.

2. Close the air regulator (F).

3. Open the pump’s bleed-type master air valve (E).

NOTE: When changing fluid containers with the hose
and gun already primed, open the drain valve (M) to
help prime the pump and vent air before it enters the
hose. Close the drain valve when all air is eliminated.

CAUTION

Do not allow the pump to run dry. It will quickly
accelerate to a high speed, causing damage. If your
pump is running too fast, stop it immediately and
check the fluid supply. If the container is empty and
air has been pumped into the lines, refill the con­tainer and prime the pump and the lines, or flush and
leave it filled with a compatible solvent. Eliminate all
air from the fluid system.

9. With the pump and lines primed, and with ade­quate air pressure and volume supplied, the pump
will start and stop as you open and close the gun.
In a circulating system, the pump will speed up or
slow down on demand, until the air supply is shut
off.

4. Hold a metal part of the gun (S) firmly to the side
of a grounded metal pail and hold the trigger open.

5. Slowly open the regulator until the pump starts.

6. Cycle the pump slowly until all air is pushed out
and the pump and hoses are fully primed.

7. Release the gun trigger and lock the trigger safety.
The pump should stall against pressure.

8. If the pump fails to prime properly, open the drain
valve (M). Use the drain valve as a priming valve
until the fluid flows from the valve. Close the valve.

WARNING

COMPONENT RUPTURE HAZARD

To reduce the risk of overpressurizing
your system, which could cause compo­nent rupture and serious injury, never

exceed the specified Maximum Incoming Air Pres­sure to the pump (see the Technical Data, on

pages 28–30).

10. Use the air regulator (F) to control pump speed
and fluid pressure. Always use the lowest air
pressure necessary to get the desired results.
Higher pressures cause premature tip and pump
wear.

308354 11

Operation/Maintenance

Shutdown and Care of the Pump

WARNING

To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 10.

For overnight shutdown, stop the pump at the bottom
of its stroke to prevent fluid from drying on the ex­posed displacement rod and damaging the throat
packings. Relieve the pressure.

Always flush the pump before the fluid dries on the
displacement rod. See Flushing below.

Flushing

WARNING

FIRE AND EXPLOSION HAZARD
Before flushing, read the section FIRE
OR EXPLOSION HAZARD on page 5.

Be sure the entire system and flushing
pails are properly grounded. Refer to
Grounding on page 6.

Flush with a fluid that is compatible with the fluid you
are pumping and with the wetted parts in your system.
Check with your fluid manufacturer or supplier for
recommended flushing fluids and flushing frequency.
Always flush the pump before fluid dries on the dis­placement rod.

WARNING

To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 10.

1. Relieve the pressure.

2. Remove the spray tip from the gun.

3. Hold a metal part of the gun firmly to the side of a
grounded metal pail.

4. Start the pump. Always use the lowest possible
fluid pressure when flushing.

5. Trigger the gun.

6. Flush the system until clear solvent flows from the
gun.

7. Relieve the pressure.

12 308354

Operation/Maintenance

(HYDRAULIC-POWERED PUMPS)

Flush the Pump Before First Use

The pump is tested with lightweight oil, which is left in
to protect the pump parts. If the fluid you are using
may be contaminated by the oil, flush it out with a
compatible solvent. See Flushing on page 14.

Starting and Adjusting the Pump

1. Refer to Fig. 4 on page 9. Connect the suction kit
(T) to the pump’s fluid inlet, and place the tube into
the fluid supply.

2. Check the hydraulic fluid level before each use,
and add fluid as necessary.

3. Make certain that the supply line shutoff valve (U)
and the return line shutoff valve (V) are closed.

4. Start the hydraulic power supply.

5. Hold a metal part of the gun (S) firmly to the side
of a grounded metal pail and hold the trigger open.

6. Open the return line shutoff valve (V) first, then
slowly open the supply line shutoff valve (U).

7. Cycle the pump slowly until all air is pushed out
and the pump and hoses are fully primed.

8. Release the gun trigger and lock the trigger safety.
The pump should stall against pressure.

10. With the pump and lines primed, and with ade­quate hydraulic volume supplied, the pump will
start and stop as you open and close the gun. In a
circulating system, the pump will speed up or slow
down on demand, until the hydraulic power supply
is shut off.

11. Use the fluid pressure gauge (F) and flow control
valve (G) to control the pump speed and the fluid
outlet pressure. Always use the lowest hydraulic
flow and pressure necessary to get the desired
results. Higher pressures cause premature tip/noz­zle and pump wear.

WARNING

COMPONENT RUPTURE HAZARD

To reduce the risk of overpressurizing
your system, which could cause compo­nent rupture and serious injury, never

exceed the specified Maximum Incoming Air Pres­sure to the pump (see the Technical Data on page

31).

To prevent overpressurizing the hydraulic motor or
its seals, always shut off the supply line valve (U)
first, then shut off the return line valve (V).

9. If the pump fails to prime properly, open the drain
valve (M). Use the drain valve as a priming valve
until the fluid flows from the valve. Close the valve.

NOTE: When changing fluid containers with the hose
and gun already primed, open the drain valve (M) to
help prime the pump and vent air before it enters the
hose. Close the drain valve when all air is eliminated.

CAUTION

Do not allow the hydraulic oil temperature to exceed
54C (130F). The pump seals will wear faster and
leakage may occur if the pump is operated at higher
oil temperatures.

308354 13

Operation/Maintenance

(HYDRAULIC-POWERED PUMPS)

Shutdown and Care of the Pump

CAUTION

WARNING

To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 10.

For overnight shutdown, stop the pump at the bottom
of its stroke to prevent fluid from drying on the ex­posed displacement rod and damaging the throat
packings. Relieve the pressure.

Always flush the pump before the fluid dries on the
displacement rod. See Flushing below.

Flushing

WARNING

FIRE AND EXPLOSION HAZARD
Before flushing, read the section FIRE
AND EXPLOSION HAZARD on page

5. Be sure the entire system and flush­ing pails are properly grounded. Refer to
Grounding on page 6.

Never leave water or water-base fluid in the pump
overnight. If you are pumping water-base fluid, flush
with water first, then with a rust inhibitor such as
mineral spirits. Relieve the pressure, but leave the
rust inhibitor in the pump to protect the parts from
corrosion.

WARNING

To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 10.

1. Relieve the pressure.

2. Remove the spray tip from the gun.

3. Hold a metal part of the gun firmly to the side of a
grounded metal pail.

4. Start the pump. Always use the lowest possible
fluid pressure when flushing.

Flush with a fluid that is compatible with the fluid you
are pumping and with the wetted parts in your system.
Check with your fluid manufacturer or supplier for
recommended flushing fluids and flushing frequency.
Always flush the pump before fluid dries on the dis­placement rod.

5. Trigger the gun.

6. Flush the system until clear solvent flows from the
gun.

7. Relieve the pressure.

14 308354

Troubleshooting Chart

1. Relieve the pressure.

WARNING

To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the

Pressure Relief Procedure on page 10.

PROBLEM CAUSE SOLUTION

The pump fails to oper­ate.

The pump operates,
but the output is low on
both strokes.

The pump operates,
but the output is low on
the downstroke.

The pump operates,
but the output is low on
the upstroke.

Erratic or accelerated
pump speed.

Restricted air/hydraulic line or an inade­quate air/hydraulic supply; closed or
clogged valves.

Obstructed fluid hose or gun;
the fluid hose ID is too small.

Fluid has dried on the displacement rod. Clean the rod; always stop the pump at the bottom

Dirty, worn, or damaged motor parts. Clean or repair; see the separate motor manual.
Restricted air/hydraulic line or an inade-

quate air/hydraulic supply; closed or
clogged valves.

Obstructed fluid hose or gun;
the fluid hose ID is too small.

Worn packings in the displacement
pump.

Held open or worn intake valve. Clear the valve; service.

Held open or worn piston valve or pack­ings.

Exhausted fluid supply. Refill the supply and prime the pump.

Held open or worn piston valve or pack­ings.

Held open or worn intake valve. Clear the valve; service.

2. Check all possible causes and problems before
disassembling the pump.

Clear the line; increase the air/hydraulic supply.
Check that the valves are open.

Open, clear*; use a hose with a larger ID.

of its stroke;
keep the wet-cup 1/3 filled with a compatible sol­vent.

Clear the line; increase the air/hydraulic supply.
Check that the valves are open.

Open, clear*; use a hose with a larger ID.

Replace the packings.

Clear the valve; replace the packings.

Clear the valve; replace the packings.

* To determine if the fluid hose or gun is obstructed, follow the Pressure Relief Procedure on page 10. Discon-

nect the fluid hose and place a container at the pump fluid outlet to catch any fluid. Turn on the air or hydraulic
power just enough to start the pump. If the pump starts when the air or hydraulic power is turned on, the ob­struction is in the fluid hose or gun.

NOTE: If you experience air motor icing, call your Graco distributor.

308354 15

Service

Required Tools

 Set of adjustable wrenches
 Large pipe wrench
 Torque wrench
 Rubber mallet
 O-ring pick
 Large vise
 Thread lubricant
 Thread sealant

Disconnecting the Displacement Pump

1. Flush the pump, if possible. Stop the pump at the
bottom of its stroke.

WARNING

To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 10.

2. Relieve the pressure.

5. Using an adjustable wrench (or hammer and
punch), unscrew the coupling nut (106) from the
motor shaft (W). Do not lose or drop the coupling
collars (107). See Fig. 6.

6. Hold the tie rod flats with a wrench to keep the
rods from turning. Unscrew the nuts (108) from the
tie rods (105). Carefully remove the displacement
pump (109) from the motor (101).

7. Refer to page 18 for displacement pump service.
To service the air motor, refer to the separate
motor manual, supplied.

Reconnecting the Displacement Pump

1. Make sure the coupling nut (106) and the coupling
collars (107) are in place on the displacement rod
(1). See Fig. 6.

2. Use at least two people to hold the displacement
pump while another reconnects it to the motor (see
the CAUTION at left). Orient the pump’s fluid
outlet (U) to the air inlet (V) as was noted in step 4
under Disconnecting the Displacement Pump.
Position the displacement pump (109) on the tie
rods (105).

3. Disconnect the air hose and the fluid hose.

4. Disconnect the displacement pump (109) from the
motor (101) as follows. Note the relative position of
the pump’s fluid outlet (U) to the air inlet (V) of the
motor. If the motor does not require servicing,
leave it attached to its mounting.

CAUTION

Be sure to use at least two people when lifting,
moving, or disconnecting the pump. This pump is too
heavy for one person. If you are disconnecting the
displacement pump from a motor which is still
mounted (for example, on a wall bracket), be sure to
support the displacement pump while it is being
disconnected, to prevent it from falling and causing
injury or property damage. Do this by securely brac­ing the pump, or by having at least two people hold it
while another disconnects it.

If the pump is mounted on a cart, slowly tip the cart
backward until the handle rests on the ground, then
disconnect the displacement pump.

3. Screw the nuts (108) onto the tie rods (105) and
torque to 81–89 N.m (60–66 ft-lb).

4. Screw the coupling nut onto the motor shaft (W)
loosely. Hold the motor shaft flats with a wrench to
keep it from turning. Use an adjustable wrench to
tighten the coupling nut. Torque to 196–210 N.m
(145–155 ft-lb).

5. Reconnect all hoses. Reconnect the ground wire if
it was disconnected. Fill the packing nut (2) 1/3 full
of Graco Throat Seal Liquid or compatible solvent.

6. Turn on the air supply. Run the pump slowly to
ensure proper operation.

WARNING

To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 10.

7. Before returning the pump to production, relieve
the pressure and retorque the packing nut (2) to
136–149 N.m (100–110 ft-lb).

16 308354

Service

Model 237287 Shown

101

W

107

106

V

110

2

1

Torque to 136–149 N.m (100–110 ft-lb)

2

Torque to 196–210 N.m (145–155 ft-lb)

3

Torque to 81–89 N.m (60–66 ft-lb)

Fig. 6

1

105

3

1

2

108

3

109

U

04142B

308354 17

Service

DISPLACEMENT PUMP SERVICE

Disassembly

When disassembling the pump, lay out all the removed
parts in sequence, to ease reassembly.

NOTE: Packing Repair Kits are available. For the best
results, use all the new parts in the kit. Kit parts are
marked with an asterisk, for example (3*). You can
also convert the pump to different packing materials.
Refer to page 27.

1. Place the pump lengthwise in a large vise, with the
jaws on either the outlet housing (7) as shown in
Fig. 7 or on the cylinder (9) flats. Using the sup­plied wrench (110), loosen, but do not remove, the
packing nut (2).

2. Apply a pipe wrench to the flats of the intake valve
(19). Unscrew the intake valve (19) from the intake
housing (18). Be careful to catch the intake ball
(17) as you remove the intake valve, so that it
does not fall and suffer damage. Remove the seal
(8) from the intake valve. Inspect the ball and the
seat (D) of the intake valve for wear or damage.

3. Apply a pipe wrench to the hex of the valve hous­ing (18). The pump assembly may separate at joint
A or joint B.

 If the assembly separates at joint B:

c. Unscrew the cylinder (9) and valve housing

(18) from the outlet housing (7). Gently pull the
cylinder and valve housing straight out of the
outlet housing; the displacement rod (1) and
piston assembly will come out with these
parts.

d. Place the valve housing (18) in the vise and

unscrew the cylinder (9) from the housing,
using a 2–5/8 in. wrench for the cylinder flats.
The displacement rod (1) and piston assembly
will remain in the cylinder.

e. Using a rubber mallet, drive the displacement

rod (1) and piston assembly out of the cylinder
(9) until the piston comes free. Pull the rod and
piston from the cylinder, being careful not to
scratch the parts.

f. Remove the two seals (8) from the cylinder.

Shine a light into the cylinder (9) to inspect the
inner surface for scoring or wear. Now go to
step 4.

4. Place the flats of the piston seat housing (16) in a
vise, as shown in Fig. 8.

CAUTION

To reduce the possibility of costly damage to the rod
(1) and cylinder (9), always use a rubber mallet to
drive the rod out of the cylinder. Never use a ham­mer.

 If the assembly separates at joint A:

a. Unscrew the valve housing (18) from the

cylinder, using a 2–5/8 in. wrench for the
cylinder flats. Using a rubber mallet, drive the
displacement rod (1) and piston assembly out
of the outlet housing (7) and cylinder (9) until
the piston comes free. Pull the rod and piston
from the cylinder, being careful not to scratch
the parts.

b. Using a 2–5/8 in. wrench for the cylinder flats,

unscrew the cylinder (9) from the outlet hous­ing (7). Remove the two seals (8) from the
cylinder. Shine a light into the cylinder (9) to
inspect the inner surface for scoring or wear.
Now go to step 4.

18 308354

5. Using an adjustable wrench, unscrew the piston
ball housing (10) from the piston seat housing. Be
careful to catch the piston ball (11) as you sepa­rate the piston seat housing and ball housing, so
that it does not fall and suffer damage.

6. Examine the displacement rod (1) for scratches or
other damage. Only if the rod needs replace-
ment, unscrew it from the piston ball housing (10),
using an adjustable wrench on the flats of the rod.

7. Remove the glands and v-packings (P) from the
piston seat housing (16). Inspect the ball (11), and
the seat (E) and guides (F) on the housing for
wear or damage. See Fig. 9.

8. Unscrew the packing nut (2) from the outlet hous­ing (7). Remove the glands and v-packings (T).
See Fig. 9.

9. Clean all parts with a compatible solvent and
inspect them for wear or damage.

Service

D

18

1

19

9

7

1

2

17*

8*

2

A

3

Fig. 7

1

B

1

Torque to 325–353 N.m (240–260 ft-lb).

2

Lubricate.

3

2

Torque to 190–217 N.m (140–160 ft-lb).

03794B

1

1 1

10

10

1

16

1

Fig. 8

1

Torque to 271–298 N.m (200–220 ft-lb).

11*

16

03793A

308354 19

Service

Reassembly

1. If it was necessary to remove the piston ball
housing (10) from the displacement rod (1), clean

the threads of the rod and the ball housing. Screw
the ball housing onto the rod, hand tight. Place the
flats of the piston ball housing in a vise and torque
the rod to 271–298 N.m (200–220 ft-lb). See Fig.

9.

2. For standard displacement pump 236470, place
the piston packings on the piston seat housing (16)
in the following order, with the lips of the v-pack-
ings facing up: the female gland (15*), one PTFE
v-packing (14*), four leather
v-packings (12*), and the male gland (13*).
See the Piston Packing Stack Detail in Fig. 9.

NOTE: If your pump uses an optional packing configu­ration, or you want to convert the pump to a different
packing material, see page 27.

3. Place the flats of the piston seat housing (16) in a
vise. Place the ball (11*) on the housing. Screw the
piston ball housing (10) onto the piston seat hous­ing hand tight, then torque to 271–298 N.m
(200–220 ft-lb). See Fig. 8.

4. For standard displacement pump 236470, lubricate
the throat packings and place them in the outlet
housing (7) in the following order, with the lips of
the v-packings facing down: the male gland (6*),
four leather v-packings (3*), one
PTFE v-packing (5*), and the female gland (4*).
See the Throat Packing Stack Detail in Fig. 9.

6. Lubricate the piston packings. Slide the displace­ment rod (1) and piston assembly down into the
cylinder (9). The cylinder is symmetrical, so either
end may face up. Use a rubber mallet to drive the
rod into the cylinder, until the piston seat housing
(16) is near the bottom of the cylinder.

7. Install the seal (8*) on the top of the cylinder (9).
Lubricate the seal and the top threads of the
cylinder.

8. Place the outlet housing (7) in a vise, as shown in
Fig. 7. Slide the displacement rod (1) up into the
outlet housing, then screw the cylinder (9) into the
outlet housing handtight. The threads will engage
easily until the seal (8*) contacts the sealing
surface of the outlet housing. The top of the rod
will protrude from the packing nut (2).

9. Install the seal (8*) on the bottom of the cylinder
(9). Lubricate the seal and the threads of the
cylinder. With the beveled ball stop surfaces (S)
facing down (see Fig. 9), screw the intake hous­ing (18) onto the cylinder handtight. The threads
will engage easily until the seal contacts the seal­ing surface of the intake housing.

10. Install the seal (8*) on the intake valve (19). Lubri­cate the seal and the threads of the intake valve.
Place the intake ball (17*) in the intake housing
(18), then screw the intake valve into the intake
housing handtight. The threads will engage easily
until the seal contacts the sealing surface of the
intake housing.

11. Using a pipe wrench, torque the intake housing
(18) to 325–353 N.m (240–260 ft-lb). This will
torque both cylinder joints (A and B). See Fig. 7.

NOTE: If your pump uses an optional packing configu­ration, or you want to convert the pump to a different
packing material, see page 27.

5. Install the packing nut (2) loosely into the outlet
housing (7).

20 308354

12. Using a pipe wrench, torque the intake valve (19)
to 190–217 N.m (140–150 ft-lb). See Fig. 7.

13. Torque the packing nut (2) to 136–149 N.m
(100–110 ft-lb).

14. Reconnect the displacement pump to the air motor
as explained on page 16.

Service

1

Torque to 136–149 N.m (100–110 ft-lb).

Torque to 325–353 N.m (240–260 ft-lb).

2

Torque to 271–298 N.m (200–220 ft-lb).

3

4

Lubricate.

Lips face up.

5

6

Lips face down.

7

See Throat Packing Detail at left.

8

See Piston Packing Detail at left.

9

Torque to 190–217 N.m (140–160 ft-lb).

Throat Packing Stack Detail

(Displacement Pump 236470 Shown;

see page 27 for options.)

2 (Ref)

*4

4

6

6

*5

4

*3

1

2

1

7

T

7

*6

7 (Ref)

Piston Packing Stack Detail

(Displacement Pump 236470 Shown;

see page 27 for options.)

10 (Ref)

9 (Ref)

16 (Ref)

*13

*12

4

5

*14

4

5

*15

*8

4

B

3

10

*11

F

18

16

9

2

3

E

P

8

A

17*

*8

4

D

Fig. 9

18 (Ref)

*8 (Ref)

19

9

S

03634B

308354 21

Parts

Part No. 237286 Pump, Series B
56:1 Ratio, with Reduced Icing
Quiet King Air Motor

Part No. 245172 Pump, Series A
56:1 Ratio, with King Air Motor

Part No. 245173 Pump, Series A
56:1 Ratio, with Quiet King Air Motor

101

102

Ref.
No. Part No. Description Qty.

101 245112 AIR MOTOR, King, reduced icing

For Model 237286

See 309348 for parts 1

245111 AIR MOTOR, King

For Model 245172

See 309347 for parts 1

220106 AIR MOTOR, Quiet King

For Model 245173

See 309348 for parts 1
102 176529 LABEL, warning 1
105 190000 ROD, tie; 224 mm (8.82 in.)

shoulder to shoulder; carbon steel 3
106 186925 NUT, coupling 1
107 184129 COLLAR, coupling 2
108 106166 NUT, hex; M16 x 2.0 3
109 236470 PUMP, displacement

See page 26 for parts 1
110 112887 WRENCH, spanner 1

 Replacement Danger and Warning labels, tags and cards

are available at no cost.

107

106

109

04276B



These parts are included in Connection Kit

235417. For applications requiring stainless steel
tie rods, order Connection Kit 235418.

105

110

108

22 308354

Parts

Part No. 237287 Pump, Series A
28:1 Ratio, with Bulldog Air Motor

102

101

110

107

Ref.
No. Part No. Description Qty.

101 208356 AIR MOTOR, Bulldog

See 307049 for parts 1
102 176529 LABEL, warning 1
105 190000 ROD, tie; 224 mm (8.82 in.)

shoulder to shoulder; carbon steel 3
106 186925 NUT, coupling 1
107 184129 COLLAR, coupling 2
108 106166 NUT, hex; M16 x 2.0 3
109 236470 PUMP, displacement

See page 26 for parts 1
110 112887 WRENCH, spanner 1

 Replacement Danger and Warning labels, tags and cards

are available at no cost.

105

106

109

108

04142B



These parts are included in Connection Kit

235417. For applications requiring stainless steel
tie rods, order Connection Kit 235418.

308354 23

Parts

Part No. 237280 Pump, Series A
17:1 Ratio, with Senator Air Motor

102

101

107

105

106

Ref.
No. Part No. Description Qty.

101 217540 AIR MOTOR, Senator

See 307592 for parts 1
102 176529 LABEL, warning 1
105 190000 ROD, tie; 224 mm (8.82 in.)

shoulder to shoulder; carbon steel 3
106 186925 NUT, coupling 1
107 184129 COLLAR, coupling 2
108 106166 NUT, hex; M16 x 2.0 3
109 236470 PUMP, displacement

See page 26 for parts 1
110 112887 WRENCH, spanner 1

 Replacement Danger and Warning labels, tags and cards

are available at no cost.

110

108

04141B





These parts are included in Connection Kit

109

235417. For applications requiring stainless
steel tie rods, order Connection Kit 235418.

24 308354

Parts

Part No. 237290 Pump, Series A, with
Viscount Hydraulic Motor

Part No. 248817 Pump, Series A, with
Viscount Hydraulic Motor

101

103

Ref.
No. Part No. Description Qty.

101 235345 HYDRAULIC MOTOR, Viscount

See 307158 for parts 1
103 190287 ADAPTER, connecting rod 1
105 184596 ROD, tie; 315 mm (12.40 in.)

shoulder to shoulder 3
106 186925 NUT, coupling 1
107 184129 COLLAR, coupling 2
108 106166 NUT, hex; M16 x 2.0 3
109 236470 PUMP, displacement 1

For Model 237290

See page 26 for parts

248816 PUMP, displacement 1

For Model 248817

See page 26 for parts
110 112887 WRENCH, packing nut 1

110

107

106

109

105

108

05192B

308354 25

Parts

NOTE: The parts listed on this page are common to all

displacement pumps covered in this manual. Refer to page
27 for the different packing configurations available.

* These parts are included in Repair Kit 237172, which may

be purchased separately for standard Displacement
Pump 236470. See page 27. They are also included in
Conversion Kits 237173, 237174, and 237710.

 Replacement Danger and Warning labels, tags and cards

are available at no cost.

2

Ref Part
No. No. Description Qty

1 189316 ROD, displacement; stainless steel 1
2 236582 PACKING NUT; stainless steel 1
7 237182 HOUSING, outlet; stainless steel 1
8* 109499 SEAL; PTFE 3
9 189383 CYLINDER; stainless steel 1
10 189408 HOUSING, ball, piston; carbon steel 1
11* 101859 BALL, piston; stainless steel;

0.75 in. (22.2 mm) dia. 1

16 236587 HOUSING, seat, piston valve;

stainless steel w/tungsten carbide seat 1

17* 108001 BALL, intake; stainless steel;

1.5 in. (38.1 mm) dia. 1

18 189396 VALVE HOUSING, intake; stainless

steel 1

19 236588 VALVE, intake; stainless steel

w/tungsten carbide seat 1

22 101748 PLUG, pipe, socket hd; 3/8 npt;

stainless steel 1
24 172477 TAG, warning (not shown) 1
25 172479 TAG, warning (not shown) 1

10

Throat
Packing
Stack
(see page 27)

7

1

*8

9

22

11*

Piston
Packing
Stack
(see page 27)

16

8*

18

8*
17*

19

26 308354

03630B

Packing Kits

Leather Packing Kit 237172, for Standard Displacement Pump 236470, Series A

Ref Part
No. No. Description Qty

3* 184304 V-PACKING, throat; leather 4
4* 184174 GLAND, throat, female; stainless steel 1
5* 109304 V-PACKING, throat; PTFE 1
6* 184224 GLAND, throat, male; stainless steel 1
12* 184305 V-PACKING, piston; leather 4
13* 184225 GLAND, piston, male; stainless steel 1
14* 109305 V-PACKING, piston; PTFE 1
15* 184175 GLAND, piston, female; stainless steel 1

* Kit also includes items 8, 11, and 17 (see page 26).

THROAT PACKINGS:

LIPS FACE DOWN

*4

5*

*3

*6

LUBRICATE PACKINGS

PISTON PACKINGS:

*13

*12

*15

PTFE Packing Kit 237173, for Optional Displacement Pump 236897, Series A

Ref Part
No. No. Description Qty

4* 184174 GLAND, throat, female; stainless steel 1
5* 109304 V-PACKING, throat; PTFE 5
6* 184224 GLAND, throat, male; stainless steel 1
13* 184225 GLAND, piston, male; stainless steel 1
14* 109305 V-PACKING, piston; PTFE 5
15* 184175 GLAND, piston, female; stainless steel 1

* Kit also includes items 8, 11, and 17 (see page 26).

THROAT PACKINGS:

LIPS FACE DOWN

*4

*5

*6

LUBRICATE PACKINGS

PISTON PACKINGS:

*13

*14

*15

LIPS FACE UP

LIPS FACE UP

14*

0805
0806

0805
0806

UHMWPE and Leather Packing Kit 237174 (Optional)

Ref Part
No. No. Description Qty

3* 184304 V-PACKING, throat; leather 2
4* 184174 GLAND, throat, female; stainless steel 1
5* 109254 V-PACKING, throat; UHMWPE 3
6* 184224 GLAND, throat, male; stainless steel 1
12* 184305 V-PACKING, piston; leather 2
13* 184225 GLAND, piston, male; stainless steel 1
14* 109255 V-PACKING, piston; UHMWPE 3
15* 184175 GLAND, piston, female; stainless steel 1

Kit also includes items 8, 11, and 17 (see page 26).

*4

*5

*6

UHMWPE and PTFE Packing Kit 237710 (Optional)

Ref Part
No. No. Description Qty

3* 109304 V-PACKING, throat; PTFE 2
4* 184174 GLAND, throat, female; stainless steel 1
5* 109254 V-PACKING, throat; UHMWPE 3
6* 184224 GLAND, throat, male; stainless steel 1
12* 109305 V-PACKING, piston; PTFE 2
13* 184225 GLAND, piston, male; stainless steel 1
14* 109255 V-PACKING, piston; UHMWPE 3
15* 184175 GLAND, piston, female; stainless steel 1

Kit also includes items 8, 11, and 17 (see page 26).

*4

*5

*6

THROAT PACKINGS:

LIPS FACE DOWN

LUBRICATE PACKINGS

THROAT PACKINGS:

LIPS FACE DOWN

LUBRICATE PACKINGS

PISTON PACKINGS:

LIPS FACE UP

*13

*14 12*

3*

*15

PISTON PACKINGS:

LIPS FACE UP

*13

*14 12*

3*

*15

0805
0806

0805
0806

308354 27

Technical Data

n

(Model 237286 Reduced Icing Quiet King Pump,

Model 245173 Quiet King Pump, and

Model 245172 King Pump)

WARNING

Be sure that all fluids and solvents used are chemically compatible with the
Wetted Parts listed below. Always read the manufacturer’s literature before
using fluid or solvent in this pump.

Ratio 56:1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum fluid working pressure 38.6 MPa, 386 bar (5600 psi). . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum air input pressure 0.7 MPa, 7 bar (100 psi). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump cycles per 3.8 liters (1 gal.) 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fluid flow at 60 cycles/min 12.9 liters/min (3.4 gpm). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air motor piston effective area 506 cm

Stroke length 120 mm (4.75 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Displacement pump effective area 9 cm

Maximum pump operating temperature 82C (180F). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

* Noise level at 90 psi, 25 cycles/min 87 dBa. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

* Sound power level at 90 psi, 25 cycles/min 101 dBa. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air inlet size 3/4 npsm(f). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fluid inlet size 2 in. npt(f). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fluid outlet size 1 in. npt(f). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Weight approx. 109 kg (240 lb). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wetted parts 316, 440 and 17–4 PH Grades of Stainless Steel; Tungsten Carbide;. . . . . . . . .

* Tested in accordance with ISO 3744.

KEY: Fluid Outlet Pressure – Black Curves A 6.3 bar (90 psi) Air Pressure

Air Consumption – Gray Curves B 4.9 bar (70 psi) Air Pressure

NOTE:Recommended pump speed for continuous operation

(to shaded area): 60 cpm

psi

bar
MPa

5000

350
35

4000

280
28

3000

210
21

18 60 90

36

A

B

cycles/min

C 2.8 bar (40 psi) Air Pressure

54

PTFE; Glass-Filled PTFE; Leather

72

scfm

m/min

250

7.00

200

5.60

A

150

B

4.20

 (78.5 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

 (1.40 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2000

140
14

1000

70
7

gpm

C

0

012345

liters/min

FLUID FLOW (NO. 10 WEIGHT OIL)

To find Fluid Outlet Pressure (bar/psi) at a specific fluid flow (lpm/
gpm) and operating air pressure (bar/psi):

1. Locate desired flow along bottom of chart.

2. Follow vertical line up to intersection with selected fluid outlet
pressure curve (black). Follow left to scale to read fluid outlet
pressure.

28 308354

7.6

100

2.80

C

50

1.40

11.43.8

15.2

To find Pump Air Consumption (m/min. or scfm) at a specific fluid
flow (lpm/gpm) and air pressure (bar/psi):

1. Locate desired flow along bottom of chart.

2. Read vertical line up to intersection with selected air consumptio
curve (gray). Follow right to scale to read air consumption.

19.0

Technical Data

(Model 237287 Bulldog Pump)

WARNING

Be sure that all fluids and solvents used are chemically compatible with the
Wetted Parts listed below. Always read the manufacturer’s literature before
using fluid or solvent in this pump.

Ratio 28:1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum fluid working pressure 19.3 MPa, 193 bar (2800 psi). . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum air input pressure 0.7 MPa, 7 bar (100 psi). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump cycles per 3.8 liters (1 gal.) 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fluid flow at 60 cycles/min 12.9 liters/min (3.4 gpm). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air motor piston effective area 248 cm

Stroke length 120 mm (4.75 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Displacement pump effective area 12 cm (1.86 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum pump operating temperature 82

* Noise level at 100 psi, 25 cycles/min 94 dBa. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

* Sound power level at 100 psi, 25 cycles/min 109 dBa. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air inlet size 3/4 npsm(f). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fluid inlet size 2 in. npt(f). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fluid outlet size 1 in. npt(f). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Weight approx. 109 kg (240 lb). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wetted parts 316, 440 and 17–4 PH Grades of Stainless Steel; Tungsten Carbide;. . . . . . . . .

PTFE; Glass-Filled PTFE; Leather

* Tested in accordance with ISO 3744.

KEY: Fluid Outlet Pressure – Black Curves A 0.7MPa, 7 bar (100 psi) Air Pressure

Air Consumption – Gray Curves B 0.5 MPa, 4.9 bar (70 psi) Air Pressure

C 0.3 MPa, 2.8 bar (40 psi) Air Pressure

NOTE:Recommended pump speed for continuous operation

(to shaded area): 60 cpm

psi

bar
MPa

3000

210
21

2500

175

17.5

2000

140
14

1500

105

10.5

1000

70
7

500

35

3.5

0

012345

gpm

liters/min

18 60 90

36

54

72

A

B

C

cycles/min

7.6

11.43.8

15.2

scfm

m/min

250

A

7.00

200

5.60

B

150

4.20

100

C

2.80

50

1.40

19.0

FLUID FLOW (NO. 10 WEIGHT OIL)

To find Fluid Outlet Pressure (bar/psi) at a specific fluid flow
(lpm/gpm) and operating air pressure (bar/psi):

1. Locate desired flow along bottom of chart.

2. Follow vertical line up to intersection with selected fluid
outlet pressure curve (black). Follow left to scale to read
fluid outlet pressure.

To find Pump Air Consumption (m/min or scfm) at a spe-
cific fluid flow (lpm/gpm) and air pressure (bar/psi):

1. Locate desired flow along bottom of chart.

2. Read vertical line up to intersection with selected air con­sumption curve (gray). Follow right to scale to read air
consumption.

 (38 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C (180F). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

308354 29

Technical Data

(Model 237280 Senator Pump)

WARNING

Be sure that all fluids and solvents used are chemically compatible with the
Wetted Parts listed below. Always read the manufacturer’s literature before
using fluid or solvent in this pump.

Ratio 17:1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum fluid working pressure 11.7 MPa, 117 bar (1700 psi). . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum air input pressure 0.7 MPa, 7 bar (100 psi). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pump cycles per 3.8 liters (1 gal.) 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fluid flow at 60 cycles/min 12.9 liters/min (3.4 gpm). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air motor piston effective area 154 cm

Stroke length 120 mm (4.75 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Displacement pump effective area 9 cm (1.40 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum pump operating temperature 82

* Noise level at 100 psi, 25 cycles/min 93 dBa. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

* Sound power level at 100 psi, 25 cycles/min 108 dBa. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air inlet size 3/4 npsm(f). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fluid inlet size 2 in. npt(f). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fluid outlet size 1 in. npt(f). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Weight approx. 109 kg (240 lb). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wetted parts 316, 440 and 17–4 PH Grades of Stainless Steel; Tungsten Carbide;. . . . . . . . .

* Tested in accordance with ISO 3744.

KEY: Fluid Outlet Pressure – Black Curves A 0.7 MPa, 7 bar (100 psi) Air Pressure

Air Consumption – Gray Curves B 0.5 MPa, 4.9 bar (70 psi) Air Pressure

NOTE: Recommended pump speed for continuous

operation (to shaded area): 60 cpm

psi

bar
MPa

2500

175

17.5

18 60 90

C 0.3 MPa, 2.8 bar (40 psi) Air Pressure

cycles/min

36

PTFE; Glass-Filled PTFE; Leather

54

72

scfm

m/min

 (24 in.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

C (180F). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2000

140
14

1500

105

10.5

A

B

1000

70
7

500

35

3.5

gpm

liters/min

C

0

012345

FLUID FLOW (NO. 10 WEIGHT OIL)

To find Fluid Outlet Pressure (bar/psi) at a specific fluid flow
(lpm/gpm) and operating air pressure (bar/psi):

1. Locate desired flow along bottom of chart.

2. Follow vertical line up to intersection with selected fluid
outlet pressure curve (black). Follow left to scale to read
fluid outlet pressure.

30 308354

200

5.60

150

4.20

100

2.80

A
B

50

1.40

C

7.6

11.43.8

To find Pump Air Consumption (m/min or scfm) at a spe-
cific fluid flow (lpm/gpm) and air pressure (bar/psi):

1. Locate desired flow along bottom of chart.

2. Read vertical line up to intersection with selected air con­sumption curve (gray). Follow right to scale to read air
consumption.

15.2

19.0

Technical Data

(Model 237290 and 248817 Viscount II Pumps)

WARNING

Be sure that all fluids and solvents used are chemically compatible with the
Wetted Parts listed below. Always read the manufacturer’s literature before
using fluid or solvent in this pump.

Category Data

Ratio 3.5:1
Maximum fluid working pressure 34 MPa, 345 bar (5000 psi)
Maximum hydraulic oil input pressure 9.9 MPa, 99 bar (1428 psi)
Pump cycles per 3.8 liters (1 gal.) 18
Fluid flow at 60 cycles/min 12.9 liters/min (3.4 gpm)
Hydraulic motor piston effective area 31.6 cm (4.9 in.)
Stroke length 120 mm (4.75 in.)
Displacement pump effective area 9 cm (1.40 in.)
Maximum pump operating temperature 82C (180F)
* Noise level at 1450 psi hydraulic

pressure, 25 cycles/min
* Sound power level at 1450 psi

hydraulic pressure, 25 cycles/min
Hydraulic oil inlet size 3/4 npt(f)
Fluid inlet size 2 in. npt(f)
Fluid outlet size 1 in. npt(f)
Weight approx. 68 kg (150 lb)
Wetted parts Carbon Steel; Chrome Steel; Alloy Steel; Chrome, Zinc, and Nickel

88 dB(A)

103 dB(A)

Plating; 440 and 17–4 PH Grades of Stainless Steel; Ductile Iron;
Tungsten Carbide; PTFE; Glass-Filled PTFE

* Tested in accordance with ISO 3744.

308354 31

Technical Data

(Model 237290 and 248817 Viscount II Pump)

Performance Charts

To find Fluid Outlet Pressure (psi/MPa/bar) at a specific fluid flow

(lpm/gpm) and operating hydraulic pressure (psi/MPa/bar):

1. Locate desired flow along bottom of chart.

2. Follow vertical line up to intersection with selected fluid outlet
pressure curve (black). Follow left to scale to read fluid outlet
pressure.

A 9.9 MPa, 99 bar (1428 psi) hydraulic oil pressure
B7 MPa, 70 bar (1000 psi) hydraulic pressure
C 4 MPa, 40 bar (571 psi) hydraulic pressure

Test Fluid: No. 10 Weight Oil

To find Pump Hydraulic Oil Consumption (gpm or lpm) at a specific

fluid flow (lpm/gpm):

1. Locate desired flow along bottom of chart.

2. Read vertical line up to intersection with selected hydraulic con­sumption curve (dashes). Follow left to scale to read oil consump­tion.

psi

MPa, bar

5000

34, 345

4000

28, 280

3000

21, 210

2000

14, 140

1000

FLUID PRESSURE

7, 70

0

gpm

liters/minute

Fluid Outlet Pressure

cycles per minute

18 36 54

A

B

C

01234

3.8 7.6 11.4

72 72

15.2

gpm

lpm

(hyd. oil)

38.0

30.4

22.8

15.2

OIL CONSUMPTION

gpm

liters/minute

Hydraulic Oil Consumption

cycles per minute

10

8

6

4

2

7.6

0

01234

18 36 54

hydraulic oil
consumption

3.8 7.6 11.4

15.2

32 308354

Dimensions

Mounting Hole

Layout

Model 237287 Shown

G

94.28 mm
(3.712 in.)

101.6 mm
(4.0 in.)

94.28 mm

C

A

(3.712 in.)

50.8 mm
(2.0 in.)

Three M16 x

2.0
Holes

88 mm
(3.464 in.)

11.1 mm
(0.437 in.)
DIA (4)

0653

D

B

F

E

04143B

Pump Model A B C D E F G

237280 1138 mm

(44.80 in.)

237286 1180 mm

(46.44 in.)

237287 1134 mm

(44.65 in.)

245172 1130 mm

(44.49 in.)

245173 1136 mm

(44.72 in.)

237290 1344 mm

(52.91 in.)

248817 1344 mm

(52.91 in.)

590 mm

(23.23 in.)

590 mm

(23.23 in.)

590 mm

(23.23 in.)

590 mm

(23.23 in.)

590 mm

(23.23 in.)

681 mm

(26.81 in.)

681 mm

(26.81 in.)

548 mm

(21.57 in.)

590 mm

(23.21 in.)

544 mm

(21.42 in.)

540 mm

(21.26 in.)

546 mm

(21.5 in.)

663 mm

(26.10 in.)

663 mm

(26.10 in.)

257 mm

(10.12 in.)

257 mm

(10.12 in.)

257 mm

(10.12 in.)

257 mm

(10.12 in.)

257 mm

(10.12 in.)

not applicable 2 in. npt(f) 1 in. npt(f) 3/4 npt(f)

not applicable 2 in. npt(f) 1 in. npt(f) 3/4 npt(f)

2 in. npt(f) 1 in. npt(f) 3/4 npsm(f)

2 in. npt(f) 1 in. npt(f) 3/4 npsm(f)

2 in. npt(f) 1 in. npt(f) 3/4 npsm(f)

2 in. npt(f) 1 in. npt(f) 3/4 npsm(f)

2 in. npt(f) 1 in. npt(f) 3/4 npsm(f)

308354 33

Graco Standard Warranty

Graco warrants all equipment manufactured by Graco and bearing its name to be free from defects in material and workmanship on the
date of sale to the original purchaser. With the exception of any special, extended, or limited warranty published by Graco, Graco will,
for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by Graco to be 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 general wear and tear, or any malfunction, damage or wear caused by
faulty installation, misapplication, abrasion, corrosion, inadequate or improper maintenance, negligence, accident, tampering, or sub­stitution of non–Graco component parts. Nor shall Graco be liable for malfunction, damage or wear caused by the incompatibility of
Graco equipment with 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 to an authorized Graco distributor for
verification of the claimed defect. If the claimed defect is verified, Graco will repair or replace free of charge any defective parts. The
equipment will be returned to the original purchaser transportation prepaid. If inspection of the equipment does not disclose any defect
in material or workmanship, repairs will be made at a reasonable charge, which charges may include the costs of parts, labor, and
transportation.

THIS WARRANTY IS EXCLUSIVE, AND IS IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO WARRANTY OF MERCHANTABILITY OR WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.

Graco’s sole obligation and buyer’s sole remedy for any breach of warranty shall be as set forth above. The buyer agrees that no other
remedy (including, but not limited to, incidental or consequential damages for lost profits, lost sales, injury to person or property, or any
other incidental or consequential loss) shall be available. Any action for breach of warranty must be brought within two (2) years of the
date of sale.

Graco makes no warranty, and disclaims all implied warranties of merchantability and fitness for a particular purpose in connection
with accessories, equipment, materials or components sold but not manufactured by Graco. These items sold, but not manufactured
by Graco (such as electric motors, switches, hose, etc.), are subject to the warranty, if any, of their manufacturer. Graco will provide
purchaser with reasonable assistance in making any claim for breach of these warranties.

In no event will Graco be liable for indirect, incidental, special or consequential damages resulting from Graco supplying equipment
hereunder, or the furnishing, performance, or use of any products or other goods sold hereto, whether due to a breach of contract,
breach of warranty, the negligence of Graco, or otherwise.

FOR GRACO CANADA CUSTOMERS

The parties acknowledge that they have required that the present document, as well as all documents, notices and legal proceedings
entered into, given or instituted pursuant hereto or relating directly or indirectly hereto, be drawn up in English. Les parties reconnais­sent avoir convenu que la rédaction du présente document sera en Anglais, ainsi que tous documents, avis et procédures judiciaires
exécutés, donnés ou intentés à la suite de ou en rapport, directement ou indirectement, avec les procedures concernées.

Graco Information

TO PLACE AN ORDER, contact your Graco distributor, or call one of the following numbers

to identify the distributor closest to you:

1–800–328–0211 Toll Free

612–623–6921

612–378–3505 Fax

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.

MM 308354

34 308354

This manual contains English.

Graco Headquarters: Minneapolis

International Offices: Belgium, China, Japan, Korea

www.graco.com

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

06/1995, Revised 07/2006