Graco Check-Mate 450 User manual

Instructions–Parts List
308017W
Important Safety Instructions
Read all warnings and instructions in this manual.
Save these instructions.
CARBON STEEL
Check–Matet450 Pumps
WITH PRIMING PISTON, AND
SEVERE–DUTY ROD AND CYLINDER
U.S. Patent Nos. 5,147,188 and 5,154,532.
Table of Contents
List of Models 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service
Troubleshooting 12. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Tools 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disconnecting the Displacement Pump 14. . . . . . . .
Reconnecting the Displacement Pump 15. . . . . . . .
Displacement Pump Service 16. . . . . . . . . . . . . . . . .
Parts 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data and Performance Charts 33. . . . . . . . . .
Dimensions 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting Hole Layout 47. . . . . . . . . . . . . . . . . . . . . . . . . .
Warranty 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Information 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 222768 Shown
0423A
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2 308017
List of Models
Maximum Air
Working Pressure Maximum Fluid Working Pressure
Model No. Description MPa bar psi MPa bar psi
222770 10:1 ratio MonarkrPump, Series A
(UHMWPE/PTFE Packed) 1.2 12 180 12 124 1800
235626 10:1 ratio MonarkrPump, Series A
(PTFE Packed) 1.2 12 180 12 124 1800
222768 20:1 ratio PresidentrPump, Series A
(UHMWPE/PTFE Packed) 1.2 12 180 25 248 3600
237207 20:1 ratio stubby PresidentrPump,
Series A (UHMWPE/PTFE Packed) 1.2 12 180 25 248 3600
246933 20:1 ratio PresidentrPump, Series A
(Tuffstack Throat Packed) 1.2 12 180 25 248 3600
222769 34:1 ratio SenatorrPump, Series A
(UHMWPE/PTFE Packed) 0.8 8120 28 281 4080
224660 34:1 ratio Quiet SenatorrPump,
Series A (UHMWPE/PTFE Packed) 0.8 8120 28 281 4080
237492 34:1 ratio stubby SenatorrPump,
Series A (UHMWPE/PTFE Packed) 0.8 8120 28 281 4080
237780 34:1 ratio stubby Quiet Senatorr
Pump, Series A
(UHMWPE/PTFE Packed)
0.8 8120 28 281 4080
222778 55:1 ratio BulldogrPump, Series A
(UHMWPE/PTFE Packed) 0.6 6.2 90 34 341 4950
222813 55:1 ratio Quiet BulldogrPump,
Series A (UHMWPE/PTFE Packed) 0.6 6.2 90 34 341 4950
237208 55:1 ratio stubby BulldogrPump,
Series A (UHMWPE/PTFE Packed) 0.6 6.2 90 34 341 4950
237779 55:1 ratio stubby Quiet Bulldogr
Pump, Series A
(UHMWPE/PTFE Packed)
0.6 6.2 90 34 341 4950
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308017 3
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
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.
DDo not exceed the maximum working pressure stated on the equipment or in the Technical Data
for your equipment. Do not exceed the maximum working pressure of the lowest rated component
in your system.
DUse 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.
DDo not use hoses to pull equipment.
DRoute 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).
DWear hearing protection when operating this equipment.
DComply with all applicable local, state, and national fire, electrical, and safety regulations.
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4 308017
WARNING
SKIN INJECTION HAZARD
Spray from the spray gun/dispense valve, hose 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.
DFluid injected into the skin might look like just a cut, but it is a serious injury. Get immediate
surgical treatment.
DDo not point the gun/valve 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.
DAlways have the tip guard and the trigger guard on the spray gun when spraying.
DCheck the gun diffuser operation weekly. Refer to the gun manual.
DBe sure the gun/valve trigger safety operates before spraying/dispensing.
DLock the gun/valve trigger safety when you stop spraying/dispensing.
DFollow the Pressure Relief Procedure on page 9 whenever you: are instructed to relieve pres-
sure; stop spraying/dispensing; 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. Replace worn, damaged, or loose parts immediately.
Permanently coupled hoses cannot be repaired; replace the entire hose.
DUse only Graco approved hoses. Do not remove any spring guard that is used to help protect the
hose from rupture caused by kinks or bends near the couplings.
MOVING PARTS HAZARD
Moving parts, such as the priming piston, can pinch or amputate your fingers.
DKeep clear of all moving parts when starting or operating the pump.
DKeep hands and fingers away from the priming piston during operation and whenever the pump is
charged with air.
DBefore servicing the equipment, follow the Pressure Relief Procedure on page 9 to prevent the
equipment from starting unexpectedly.

308017 5
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.
DGround the equipment and the object being sprayed. Refer to Grounding on page 8.
DIf there is any static sparking or you feel an electric shock while using this equipment, stop spray-
ing/dispensing immediately. Do not use the equipment until you identify and correct the problem.
DProvide fresh air ventilation to avoid the buildup of flammable fumes from solvents or the fluid
being sprayed/dispensed.
DKeep the spray/dispense area free of debris, including solvent, rags, and gasoline.
DElectrically disconnect all equipment in the spray/dispense area.
DExtinguish all open flames or pilot lights in the spray/dispense area.
DDo not smoke in the spray/dispense area.
DDo not turn on or off any light switch in the spray/dispense area while operating or if fumes are
present.
DDo not operate a gasoline engine in the spray/dispense 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.

6 308017
Installation
General Information
NOTE: Reference numbers and letters in parentheses
in the text refer to the callouts in the figures and the
parts drawings.
NOTE: Always use Genuine Graco Parts and Acces-
sories, available from your Graco distributor. Refer to
the Product Data Sheet, Form No. 305546. If you
supply your own accessories, be sure they are ade-
quately sized and pressure-rated to meet the system’s
requirements.
Fig. 1 is only a guide for selecting and installing sys-
tem components and accessories. Contact your Graco
distributor for assistance in designing a system to suit
your particular needs.
System Accessories
WARNING
A red-handled main air bleed valve (V), pump air
bleed valve (G), and fluid drain valve (L) are re-
quired. 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 red-handled main air bleed valve (V) shuts off
and relieves the air to the pump and ram. Order
Part No. 113269 for Monark and President Pumps,
or 113218 for Senator and Bulldog Pumps. The
ram will hold pressure if the ram director valve (U)
is in the horizontal (neutral) position. To relieve air
pressure in the ram, close the red-handled bleed
valve (V) and move the director valve (U) to
DOWN. The ram will slowly drop.
The pump air bleed valve (G) relieves air trapped
between it and the pump after the air is shut off.
Trapped air can cause the pump to cycle unexpect-
edly. Locate the valve close to the pump.
The fluid drain valve (L) 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 (3/8 npt).
Air Line
Install the following accessories as shown in Fig. 1,
using adapters as necessary:
DA red-handled main air bleed valve (V) is re-
quired in your system to shut off the air supply to
the pump and ram (see the WARNING at left).
When closed, the valve will bleed off all air in the
ram and pump, and the ram will slowly drop. Be
sure the valve is easily accessible from the pump,
and is located upstream from the air manifold (D).
DThe pump air bleed valve (G) is required in your
system to relieve air trapped between it and the air
motor when the valve is closed (see the WARNING
at left). Be sure the valve is easily accessible from
the pump, and is located downstream from the air
regulator (H).
DThe pump air regulator (H) controls pump speed
and outlet pressure by adjusting the air pressure to
the pump. Locate the regulator close to the pump,
but upstream from the pump air bleed valve (G).
DAn air line lubricator (F) provides automatic air
motor lubrication.
DApump runaway valve (E) 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.
DAn air manifold (D) has a swivel air inlet. It has
ports for connecting lines to air accessories, such
as the ram air regulator (T), which controls the air
pressure to the ram.
DThe air pressure relief valve (Q) limits the air
pressure to the ram to 10 bar (150 psi).
DThe ram director valve (U) controls the raising
and lowering of the ram.
DAn 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.
DA bleed-type air valve (K) isolates the air line
accessories for servicing. Locate upstream from all
other air line accessories.

308017 7
Installation
Fluid Line Accessories
Install the following accessories in the positions shown
in Fig. 1, using adapters as necessary:
DInstall a fluid drain valve (L) in a tee near the
pump fluid outlet. The drain valve is required in your
system to relieve fluid pressure in the displacement
pump, hose and gun/valve (see the WARNING on
page 6). Install with the drain valve pointing down,
but so the handle points up when the valve is open.
DA fluid regulator (M) controls fluid pressure to the
gun/valve, and dampens pressure surges.
DA gun or dispense valve (N) dispenses the fluid.
The gun shown in Fig. 1 is a high pressure dispens-
ing gun for highly viscous fluids.
DA gun/valve swivel (P) allows freer gun/valve
movement.
Air and Fluid Hoses
Be sure all air hoses (S) and fluid hoses (R) are prop-
erly sized and pressure-rated for your system. Use
only electrically conductive hoses. Fluid hoses must
have spring guards on both ends.
05683
Fig. 1
KEY
APump
B19 Liter (5 Gallon) Air-Powered Ram
CWiper Plate
DAir Manifold
EPump Runaway Valve (location shown)
FAir Line Lubricator (location shown)
GPump Bleed-Type Air Valve
(required, for pump)
HPump Air Regulator
JAir Line Filter
KBleed-Type Air Valve (for accessories)
LFluid Drain Valve (required)
MFluid Pressure Regulator
NAirless Spray Gun or Dispensing Valve
PGun/Valve Swivel
QRam Air Pressure Relief Valve
RElectrically Conductive Fluid Supply Hose
SElectrically Conductive Air Supply Hose
TRam Air Regulator
URam Director Valve
VRed-Handled Main Air Bleed Valve
WAir LIne Drain Valve
YGround Wire (required, see page 8 for
installation instructions)
A
B
D
E
F
G
JK
Y
R
T
L
N
P
S
M
C
W
H
S
V
QU

8 308017
Installation
Grounding
WARNING
FIRE AND EXPLOSION HAZARD
Before operating the pump, ground the
system as explained below. Also read
the section FIRE AND EXPLOSION
HAZARD on page 5.
1. Pump: 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.
Fig. 2
W
X
Y
Z
0864
2. Air and fluid hoses: use only electrically conductive
hoses.
3. Air compressor: follow manufacturer’s recommen-
dations.
4. Spray gun/dispense valve: ground through connec-
tion 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. All solvent pails used when flushing: follow your
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
continuity.
8. To maintain grounding continuity when flushing or
relieving pressure, always hold a metal part of the
gun/valve firmly to the side of a grounded metal
pail, then trigger the gun/valve.
Mounting Accessories
Mount the pump (A) to suit the type of installation
planned. Pump dimensions and the mounting hole
layout are shown on pages 46 and 47.
If you are mounting the pump on a ram (B), refer to the
manual supplied with the ram for installation and
operation instructions. The ram shown in Fig. 1 is a 19
liter (5 gal.) pail ram, used with a wiper plate (C). The
ram shown includes an air regulator (T). It also re-
quires an air supply hose (S) and an air manifold (D),
which divides the main air supply into separate lines
for the pump and the ram.
By using Pump Mounting Kit 222776, you can also
mount the pump on Floor Stand 222780, 200 liter (55
gal.) Ram 207279, or Inductor 222635.

308017 9
Operation
Pressure Relief Procedure
WARNING
SKIN INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or dispensing 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:
Dare instructed to relieve the pressure,
Dstop spraying/dispensing,
Dcheck or service any of the system equipment,
Dor install or clean the spray tip/nozzle.
1. Lock the gun/valve trigger safety.
2. Close the pump’s bleed-type air valve (G, required
in your system).
3. Shut off the red-handled main air bleed valve (V,
required in your system). If the pump is mounted
on a ram, set the ram director valve (U) to DOWN.
The ram will slowly drop.
4. Unlock the gun/valve trigger safety.
5. Hold a metal part of the gun/valve firmly to the side
of a grounded metal pail, and trigger the gun/valve
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/dispense again.
If you suspect that the spray tip/nozzle 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/nozzle or hose.
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. 3.
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 pressure, then torque
the nut to 45–53 NSm (33–39 ft-lb) using the supplied
wrench (110). Do this whenever necessary. Do not
overtighten the packing nut.
0423A
25
35
2
43
Fig. 3
1Bleed hole must face down.
110
1
2Torque to 45–53 NSm (33–39 ft-lb).
2
AA
23

10 308017
Operation
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 11.
Starting and Adjusting the Pump
WARNING
MOVING PARTS HAZARD
See Fig. 3. The priming piston (25) and
the air motor piston (located behind the
air motor plates, AA) move during opera-
tion.
Keep hands and fingers away from the priming
piston (25) during operation and whenever the
pump is charged with air. The priming piston ex-
tends beyond the intake cylinder (23) to pull materi-
al into the pump and can amputate a hand or finger
caught between it and the intake cylinder. Follow
the Pressure Relief Procedure on page 9,
before checking, clearing, or cleaning the priming
piston.
Never operate the pump with the air motor plates
(AA) removed.
1. Do not install the spray tip yet.
2. Supply fluid to the pump, per the requirements of
your system.
3. See Fig. 1. Close the pump air regulator (H).
4. Open the red-handled main air bleed valve (V) and
the pump’s bleed-type air valve (G).
5. Hold a metal part of the gun/valve (N) firmly to the
side of a grounded metal pail and hold the trigger
open.
6. Slowly open the air regulator (H) until the pump
starts.
7. Cycle the pump slowly until all air is pushed out
and the pump and hoses are fully primed.
8. Release the gun/valve trigger and lock the trigger
safety. The pump should stall against pressure.
WARNING
SKIN INJECTION HAZARD
To reduce the risk of fluid injection, do not use
your hand or fingers to cover the bleed hole on the
underside of the bleeder valve body (43) when
priming the pump. Use a crescent wrench to open
and close the bleeder plug (35). Keep your hands
away from the bleed hole.
9. If the pump fails to prime properly, open the
bleeder valve plug (35) slightly. Use the bleed hole
on the underside of the valve body (43) as a
priming valve until the fluid appears at the hole.
See Fig. 3. Close the plug (35).
NOTE: When changing fluid containers with the hose
and gun/valve already primed, open the bleeder valve
plug (35) to help prime the pump and vent air before it
enters the hose. Close the plug when all air is elimi-
nated.
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 con-
tainer and prime the pump and the lines, or flush and
leave it filled with a compatible solvent. Eliminate all
air from the fluid system.

308017 11
Operation
Starting and Adjusting the Pump
(continued)
10. With the pump and lines primed, and with ade-
quate air pressure and volume supplied, the pump
will start and stop as you open and close the
gun/valve. In a circulating system, the pump will
speed up or slow down on demand, until the air
supply is shut off.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
11. Relieve the pressure. Install the spray tip in the
gun.
WARNING
COMPONENT RUPTURE HAZARD
To reduce the risk of overpressurizing
your system, which could cause compo-
nent rupture and serious injury, never
exceed the Maximum Incoming Air Pressure to the
pump (see the Technical Data on pages 33–43).
12. Use the air regulator (H) to control the pump speed
and the fluid pressure. Always use the lowest air
pressure necessary to get the desired results.
Higher pressures cause premature tip/nozzle and
pump wear.
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 9.
For overnight shutdown, stop the pump at the bottom
of the stroke to prevent fluid from drying on the ex-
posed displacement rod and damaging the throat
packings. Relieve the pressure.
Always flush the pump before the fluid dries on the
displacement rod. Refer to Flushing at right.
Flushing
WARNING
FIRE AND EXPLOSION HAZARD
Before operating the pump, read the
section FIRE AND EXPLOSION HAZ-
ARD on page 5. Be sure the entire
system and flushing pails are properly
grounded. Refer to Grounding on page
8.
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 dis-
placement rod.
CAUTION
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 9.
1. Relieve the pressure.
2. Remove the spray tip/nozzle from the gun/valve.
3. Hold a metal part of the gun/valve 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/valve.
6. Flush the system until clear solvent flows from the
gun/valve.
7. Relieve the pressure.

12 308017
Troubleshooting
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
1. Relieve the pressure.
2. Check all possible problems and causes before
disassembling the pump.
PROBLEM CAUSE SOLUTION
Pump fails to operate. Restricted line or inadequate air supply;
closed or clogged valves. Clear; increase the air supply. Check that all valves are open.
Obstructed fluid hose or gun/valve;
fluid hose ID is too small. Open, clear*; use a hose with a larger ID.
Fluid dried on the displacement rod. Clean; always stop the pump at the bottom of its
stroke; keep the wet-cup 1/3 filled with a compat-
ible solvent.
Dirty, worn, or damaged motor parts. Clean or repair; see the separate motor manual.
Pump operates, but
output is low on both
strokes.
Restricted line or inadequate air supply;
closed or clogged valves. Clear; increase the air supply. Check that all valves are open.
Obstructed fluid hose or gun/valve;
fluid hose ID is too small. Open, clear*; use a hose with a larger ID.
Bleeder valve is open. Close the valve.
Air is leaking into the supply container. Check the ram plate seal.
Fluid is too heavy for pump priming. Use the bleeder valve (see page 10); use a ram.
Held open or worn intake valve or seals. Clear the valve; replace the seals.
Worn packings in the displacement
pump. Replace the packings.
Pump operates, but
output is low on down-
stroke.
Fluid too heavy for pump priming. Use the bleeder valve (see page 10); use a ram.
Held open or worn intake valve or seals. Clear the valve; replace the seals.
Pump operates, but
output is low on up-
stroke.
Held open or worn piston valve or seals. Clear the valve; replace the seals.
THE TROUBLESHOOTING CHART IS CONTINUED ON PAGE 13.
* To determine if the fluid hose or gun is obstructed, follow the Pressure Relief Procedure on page 9. Disconnect
the fluid hose and place a container at the pump fluid outlet to catch any fluid. Turn on the air just enough to start
the pump. If the pump starts when the air is turned on, the obstruction is in the fluid hose or gun.

308017 13
Troubleshooting
PROBLEM CAUSE SOLUTION
Erratic or accelerated
pump speed. Exhausted fluid supply. Refill and prime.
Fluid is too heavy for pump priming. Use the bleeder valve (see page 10); use a ram.
Held open or worn piston valve or seals. Clear the valve; replace the seals.
Held open or worn priming piston. Clear; service.
Worn packings in the displacement
pump. Replace the packings.

14 308017
Service
Required Tools
DTorque wrench
DBench vise, with soft jaws
DRubber mallet
DHammer
DO-ring pick
D13 mm (1/2 in.) dia. brass rod
DSet of socket wrenches
DSet of adjustable wrenches
DPipe wrench
DPacking nut wrench (110, supplied)
DThread lubricant
DThread 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 9.
2. Relieve the pressure.
3. Disconnect the air hose. Hold the fluid outlet fitting
(8) with a wrench to keep it from being loosened
while you disconnect the fluid hose.
4. Remove the pump from its mounting. Disconnect
the displacement pump (107) from the motor (101)
as follows. Be sure to note the relative position of
the pump’s fluid outlet (8) to the motor air inlet
(CC).
5. Using an adjustable wrench (or a hammer and
rod), unscrew the coupling nut (104) from the
connecting rod (103) or air motor shaft. Do not
lose or drop the coupling collars (105). See Fig. 4.
6. Hold the tie rod flats with a wrench to keep the
rods from turning. Use the wrench (110) provided
with the pump to unscrew the nuts (106) from the
tie rods (102). Carefully remove the displacement
pump (107) from the motor (101).
7. Refer to page 16 for displacement pump service.
To service the air motor, refer to the separate
motor manual, supplied.

308017 15
Service
Reconnecting the Displacement Pump
1. Make sure the coupling nut (104) and the coupling
collars (105) are in place on the displacement rod
(1). See Fig. 4.
2. Orient the pump’s fluid outlet (8) to the air inlet
(CC) as was noted in step 4 under Disconnecting
the Displacement Pump. Position the displace-
ment pump (107) on the tie rods (102).
NOTE: Refer to Fig. 4 and the Torque Chart for proper
torque values for your pump.
3. If you removed the tie rods (102) from the air
motor (101), reinstall them using an 11 mm
wrench. Torque as specified.
4. Screw the nuts (106) onto the tie rods (102) and
torque as specified.
5. Screw the coupling nut (104) onto the connecting
rod (103) or air motor shaft loosely. Hold the
connecting rod flats with a wrench to keep it from
turning. Using an adjustable wrench, torque the
coupling nut.
6. Using a torque wrench in the square hole of the
supplied wrench (110), torque the packing nut (2).
7. Mount the pump and reconnect all hoses. Recon-
nect the ground wire if it was disconnected. Fill the
wet-cup (2) 1/3 full of Graco Throat Seal Liquid or
compatible solvent.
8. 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 9.
9. Before returning the pump to production, relieve
the pressure and retorque the packing nut (2).
PUMP TORQUE CHART (Refer to Fig. 4)
Pump
Model Tie Rod (102) Tie Rod Nut (106) Coupling Nut (104) Packing Nut (2)
222768,
237207,
246933
4 1 3 2
222769,
222770,
222778,
222813,
224660,
235626
5 1 3 2
237208,
237492,
237779,
237780
7 7 6 2
101
111
103
105
107
8
2
110
2
1
CC
Torque to 50–61 NSm
(37–45 ft-lb).
Torque to 27–34 NSm
(20–25 ft-lb).
Torque to 45–53 NSm
(33–39 ft-lb).
Torque to 81–89 NSm
(60–66 ft-lb).
Torque to 195–210 NSm
(145–155 ft-lb).
Torque to 20–25 NSm
(15–18 ft-lb).
Torque to 36–45 NSm
(27–33 ft-lb).
Fig. 4
1
3
4
2
102
104
106
Model 222768
President Pump
Shown
4
3
1
5
6
7
or
or
or 7
6
,5,
7
0424A

16 308017
Service
Displacement Pump Service
Disassembly
When disassembling the pump, lay out all removed
parts in sequence, to ease reassembly.
NOTE: Repair Kit 222773 is available for Displacement
Pumps 222790, 237206, 237450 and 246933. The kit
includes piston and intake seals and cylinder o-rings.
For the best results, use all the new parts in the kit. Kit
parts are marked with one asterisk, for example (11*).
Repair Kits 222774 (UHMWPE/PTFE), 222775
(PTFE), 237916 (UHMWPE/leather), and 234422
(UHMWPE/Tuffstack) are available to replace the
throat packings. For the best results, use all the new
parts in the kit. Kit parts are marked with a symbol, for
example (3{). See page 32.
Repair Kit 222793 is available to service the intake
valve of Displacement Pumps 222790, 237206,
237450 and 246933. For the best results, use all the
new parts in the kit. Kit parts are marked with a sym-
bol, for example (19}).
1. Remove the displacement pump from the air motor
as explained on page 14. Place the pump in a
vise, with the jaws on the outlet housing (10).
2. Hold the flats of the priming piston rod (24) with a
12 mm wrench. Using a 22 mm wrench, unscrew
the priming piston nut (30). Slide the priming piston
(25) and piston guide (31) off the rod. Inspect the
surfaces of the guide (31) and piston (25) for
scoring, wear, or other damage.
3. Loosen the packing nut (2) using the wrench (110)
supplied, or a hammer and brass rod. Remove the
intake cylinder (23), using an adjustable wrench.
4. Unscrew the intake valve housing (17) from the
cylinder (12), using an adjustable wrench. Pull the
housing off the pump. The intake check valve
assembly (DD) should slide down the priming
piston rod (24) as you remove the housing; if it
does not slide easily, firmly tap on the top of the
housing (17) with a rubber mallet to loosen.
5. Use an o-ring pick to remove the seal (21) from
the intake valve housing (17). Discard the seal;
use a new one for reassembly. Pull the intake
valve seat (22) out the bottom of the housing (17).
If the seat is difficult to remove, insert a brass rod
through the top of the housing and drive the seat
out with a hammer. Take care not to drop the
check valve assembly (DD) as it comes free, and
set it aside for later.
6. Push the displacement rod (1) down as far as
possible, then pull it and the priming piston rod
(24) out of the outlet housing (10) and cylinder
(12).
7. Remove the packing nut (2), throat packings (5
and/or 3) and glands (4 and 6) from the outlet
housing (10). Some models include a fluid outlet
nipple (8) and o-ring (9). Do not remove these
parts from the housing unless they need replace-
ment.
8. Unscrew the bleeder valve plug (35) completely
from the valve body (43). Clean the valve threads
and the bleed hole. It is not necessary to remove
the valve body from the pump outlet housing (10).
9. Use a 400 mm adjustable wrench on the flats of
the pump cylinder (12) and unscrew the cylinder
from the outlet housing (10). Remove the o-rings
(11). Inspect the inside surface of the cylinder for
wear, scoring or other damage by holding it up to
the light at an angle or running a finger over the
surface.
10. Inspect the outer surfaces of the displacement rod
(1) and priming piston rod (24) for wear, scoring or
other damage by holding them up to the light at an
angle or running a finger over the surface.
11. Use a vise with soft jaws to hold the displacement
rod (1) by its flats. Place a 19 mm wrench on the
flats of the piston and unscrew the piston (13) and
priming piston rod (24) from the displacement rod
(1). Remove the spacer (33). Disassemble the
piston guide (14) from the piston (13).
12. It is not necessary to remove the priming piston
rod (24) from the piston (13) unless your inspec-
tion reveals scoring, wear, or other damage to
either part. To disassemble, place the piston flats
in a vise and unscrew the rod, using a 12 mm
wrench on the flats.

308017 17
Service
Fig. 5
1
3
4
2
2
10
11
11
21
22
31
30
23
24
4
5
or
3
6
3
Lips of v-packings must face down.
Throat Packing Detail
12
1
9
25
35
17
Valve Plug (remove and clean).
See Detail at right.
8
2
2
Valve Body (do not remove).
4
3
5Remove only if damaged.
5
DD
43
0425B
13
33
14
15
16
19
*20
18
Detail of Piston and
Intake Check Valve
12
(Ref)
1
(Ref)
24
(Ref)
42
DD
17
(Ref)

18 308017
Service
13. Place the flats of the piston seat (16) in a vise.
Using a 13 mm (1/2 in.) dia. brass rod (EE), un-
screw the piston guide (14) from the piston seat
(16). See Fig. 6. Remove the piston seal (15);
always replace with a new one. Inspect the mating
surfaces of the piston (13) and piston seat (16) for
nicks, scoring or wear.
Fig. 6
14
16
0205
EE
14. To disassemble the intake check valve (DD), place
the nut (18) in a vise and unscrew the intake valve
body (19), using a 28 mm wrench. See Fig. 7.
Remove the seals (42, 20) from the nut and from
the valve body; always replace them with new
ones. Inspect the mating surfaces of the intake
valve body (19) and seat (22) for wear, scoring, or
other damage.
NOTE: The seal (42) is press-fit in the nut (18) and
may require cutting to ease removal.
15. Inspect all parts for damage and clean with a
compatible solvent. To reassemble, refer to page
19.
Fig. 7
19
18
0206

308017 19
Service
Reassembly (Refer to Fig. 8)
1. Place a 13 mm (1/2 in.) diameter brass rod length-
wise in a vise. Install a new piston seal (15*) on
the piston seat. Apply thread sealant to the
threads of the piston seat. Place the piston guide
(14) securely on the brass rod. Using a 32 mm
crow’s-foot, screw the piston seat (16) into the
piston guide. Torque to 27–34 N.m (20–25 ft-lb).
2. If it was necessary to remove the priming piston
rod (24) from the piston (13), apply thread sealant
to the threads of the rod. Place the flats of the
piston (13) in a vise. Hold the flats of the rod with a
12 mm wrench, and screw the rod into the piston.
Torque to 45–53 N.m (33–39 ft-lb).
3. Use a vise with soft jaws to hold the displacement
rod (1) by its flats. Install the spacer (33, see the
following note) on the rod. Install the assembled
piston guide/seat on the piston (13). Apply thread
sealant to the threads of the displacement rod, and
screw the piston assembly onto the rod, using a 19
mm wrench on the flats of the piston. Torque to
120–130 N.m (88–95 ft-lb). There will be a small
gap between the top of the piston (13) and the
shoulder of the rod (1).
NOTE: The piston spacer (33) is not required when
pumping fluids with a viscosity greater than 1 million
centipoise.
4. Lubricate the threads of the bleeder valve plug
(35). The plug has two sets of threads. Be sure to
screw the plug completely into the valve body (43).
Torque the plug to 30–38 NSm(22–28 ft-lb).
NOTE: Some models include an outlet nipple (8) and
o-ring (9*). It is not ordinarily necessary to remove
these parts. However, if they were replaced because of
damage, lubricate the o-ring and place it on the nipple.
Screw the nipple into the outlet housing (10). Torque to
70–75 N.m (51–55 ft-lb).
5. Lubricate the o-rings (11*) and install them on the
cylinder (12). Apply thread lubricant to the top
threads of the cylinder. Using a 400 mm wrench on
the flats of the cylinder, screw it into the outlet
housing (10). Torque to 325–354 N.m (240–260
ft-lb).

20 308017
Service
6. Lubricate the throat packings and glands, and
install them in the outlet housing (10) one at a time
in the following order, with the lips of the v-pack-
ings facing down: the male gland (6{), v-pack-
ings (see the NOTE below), and the female gland
(4{). Apply thread lubricant to the packing nut (2)
and install the nut loosely in the outlet housing.
NOTE: Refer to page 32 for the correct throat packing
configuration for your pump.
7. Carefully insert the displacement rod (1) into the
bottom of the cylinder (12). Push the rod up into
the cylinder and through the outlet housing (10),
until it protrudes from the packing nut (2). Be
careful not to damage the piston seal (15*) while
performing this step.
8. Apply thread lubricant to the bottom threads of the
cylinder (12). Be sure the o-ring (11*) is in place on
the cylinder. Guide the intake valve housing (17)
up onto the priming piston rod (24) and screw it
onto the cylinder, using an adjustable wrench.
Torque to 325–354 N.m (240–260 ft-lb).
9. With the beveled side facing up, press the seal
(42) into the recess of the intake packing nut (18)
until it snaps into place. The nose of the seal
should be flush with or slightly recessed into the
face of the packing nut.
10. Apply sealant to the threads of the intake packing
nut (18). With the threads facing down toward the
pump intake, slide the nut up onto the priming
piston rod (24) until it clears the flats of the rod.
11. Lubricate a new intake valve seal (20*) and slide it
onto the rod, being careful not to damage the seal
when passing over the flats of the rod. Slide the
seal up until it reaches the packing nut (18). Apply
sealant to the female threads of the intake valve
body (19), and slide it onto the rod until it reaches
the nut (18).
12. Place a 26 mm wrench on the flats of the packing
nut (18) and a 28 mm wrench on the flats of the
valve body (19). Screw the nut into the body,
making certain they remain in position above the
flats of the rod (24). Torque to 45–53 N.m (33–39
ft-lb). Slide the assembled intake check valve up
the priming piston rod until it reaches the stop
(FF); this may be difficult due to high friction
between the seal and rod.
13. Position the intake valve seat (22) so its large
beveled side faces down toward the pump intake.
Slide the seat (22) onto the priming piston rod (24)
and into the intake valve housing (17) until it seats
on the lower lip of the housing. Lubricate a new
seal (21*) and push it up into the gap around the
bottom outer edge of the seat (22).
14. Apply thread lubricant to the threads of the intake
cylinder (23) and screw the cylinder into the intake
valve housing (17), using an adjustable wrench.
Torque to 325–354 N.m (240–260 ft-lb).
15. Slide the priming piston guide (31) onto the rod
(24) until it stops. Then install the priming piston
(25) with the flat side of the priming piston (25)
facing up toward the pump. Apply thread sealant to
the threads of the priming piston rod (24). Hold the
rod steady with a 12 mm wrench on the flats, and
screw the priming piston nut (30) onto the rod with
a 22 mm wrench. Torque to 45–53 N.m (33–39
ft-lb).
16. Reconnect the displacement pump to the air motor
as explained on page 15.
17. Allow 2 hours for the thread sealant to cure before
returning the pump to service.