Graco 223777 Operation manual

Instructions – Parts List
GRACO INC.ąP.O. BOX 1441ąMINNEAPOLIS, MNą55440-1441
Copyright 1987, Graco Inc. is registered to I.S. EN ISO 9001
2:1 RATIO
Standard Pumps
240 psi (1.7 MPa, 16.8 bar) Maximum Fluid Working Pressure
120 psi (0.8 MPa, 8.4 bar) Maximum Air Input Pressure
55 gallon (200 liter) Drum Size, with UHMWPE Packings
Model 218556, Series C
With Model 218554 Stainless Steel Displacement Pump
15 gallon (57 liter) Drum Size, with UHMWPE Packings
Model 223777
With Model 223775 Stainless Steel Displacement Pump
U.S. Patent No. 4,681,516
France Brevet No. 86–07085
Other U.S. and Foreign Patents Pending
307679N
Read warnings and instructions.
See page 2 for Table of Contents.
WARNING
Reactive Chemical Hazard
Graco, Inc. does not manufacture or supply any of
the reactive chemicals that may be used in this
equipment and is not responsible for their effects.
Because of the vast number of chemicals that
could be used and their varying chemical reac-
tions, before using this equipment, the buyer and
user should determine all facts relating to the ma-
terials used, including any potential hazards in-
volved. Particular inquiry and investigation should
be made into potential dangers relating to toxic
fumes, fired, explosions, reaction times, and expo-
sure of human beings to the individual components
or their resultant mixtures. Graco assumes no re-
sponsibility for loss, damage, expense, or claims
for bodily injury or property damage, direct or con-
sequential, arising from the use of such chemical
components.
TI1920A
TI1920A
Parts

2307679
Table of Contents
Symbols 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service
Model 218554 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 223775 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts
Model 218556 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 218554 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 223777 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model 223775 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Chart 24. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Standard Warranty 26. . . . . . . . . . . . . . . . . . . . . .
Graco Information 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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
corresponding 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 of the lowest rated system component. Refer to the
Technical Data on page 23 for the maximum working pressure of this equipment.
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 exceed the maximum working pressure of the lowest rated system component. This equip-
ment has a 240 psi (1.7 MPa, 16.8 bar) maximum working pressure.
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.
DDo not lift pressurized equipment.
DComply with all applicable local, state, and national fire, electrical, and safety regulations.

3307679
WARNING
PRESSURIZED EQUIPMENT HAZARD
Spray from the gun/valve, hose leaks, or ruptured components can splash fluid in the eyes or on the
skin and cause serious injury.
DDo not stop or deflect leaks with your hand, body, glove or rag.
DFollow the Pressure Relief Procedure on page 7 whenever you: are instructed to relieve pres-
sure; stop spraying; clean, check, or service the equipment; and install or clean the spray tip.
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.
MOVING PARTS HAZARD
Moving parts, such as the air motor piston, can pinch or amputate your fingers.
DKeep clear of all moving parts when starting or operating the pump.
DBefore servicing the equipment, follow the Pressure Relief Procedure on page 7 to prevent the
equipment from starting unexpectedly.
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 4.
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.

4307679
Installation
Grounding
In a low pressure air spray system, static sparking is
generally not a problem. However, some simple pre-
cautions should be taken to reduce the risk. Check you
local electrical code for detailed grounding instructions
for your area and type of equipment, and be sure to
ground all of this spray/dispensing equipment.
1. Pump: use a ground wire and clamp. See Fig. 1.
2. Air compressor: follow manufacturer’s recommen-
dations.
3. Fluid hoses: use only grounded hoses with a
maximum of 500 ft (150 m) combined hose length
to ensure grounding continuity.
4. Spray gun or dispensing valve: grounding is ob-
tained through connection to a properly grounded
fluid hose and pump.
5. Object being sprayed: according to your local
code.
6. Fluid supply containers: according to your local
code.
7. All solvent pails used when flushing, according to
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, always hold a metal part of the
spray gun/dispensing valve firmly to the side of a
grounded metal pail, then trigger the gun/valve.
Fig. 1 TI1922A
Y
W
X
Z
To ground the pump:
To ground the pump, loosen the grounding lug locknut
(W) and washer (X). Insert one end of a 12 gal. (1.5
mm2) minimum ground wire (Y) into the slot in lug (Z)
and tighten the locknut securely. See Fig. 1. Connect
the other end of the wire to a true earth ground. See
the Accessories section on page 22 to order a ground
wire and clamp.
Flushing
The pump is tested with lightweight oil, which is left in
to protect the pump parts. If the fluid you are pumping
may be contaminated by the oil, flush out the oil with a
compatible solvent before using the pump. Follow
instructions below.
Before flushing, be sure the entire system and flushing
pails are properly grounded. Refer to Grounding at
left. Follow the Pressure Relief Procedure on page
7. Always use the lowest possible fluid pressure, and
maintain firm metal–to–metal contact between the
gun/valve and the pail during flushing to reduce the
risk of injury from fluid splashing or static sparking.
WARNING
To reduce the risk of static sparking or splashing
fluid in the eyes or on the skin, follow the Pressure
Relief Procedure on page 7 before flushing. Hold
a metal part of the gun/valve firmly to the side of a
grounded metal pail and use the lowest possible
fluid pressure during flushing.
For your safety, read the warning section Fire or
Explosion Hazard on page 3 before flushing, and
follow all recommendations given.
If you are pumping fluid which dries, hardens, or sets
up, flush the system with a compatible solvent as often
as necessary to prevent a buildup of dried fluid in the
pump or hoses.
If the pump is being used to supply a circulating sys-
tem, allow the solvent to circulate through the entire
system until the pump and system is thoroughly
flushed.

5307679
Installation
TI1921A
KEY
APump Air Regulator
BAir Line Lubricator
CAir Line Filter
DBleed–Type Master Air Valve
(required, for pump)
EFluid Drain Valve (required)
FBleed–Type Master Air Valve
(to isolate air line accessories)
GGrounded Air Hose
HGrounded Fluid Hose
YGround Wire
(required, see page 3 for installation instructions)
AB
C
D
E
FG
H
Y
55 GALLON (200 LITER) DRUM INSTALLATION
(Model 218556)
15 GALLON (57 LITER) DRUM INSTALLATION
(Model 223777)
AB
C
D
E
F
G
H
Y
TI1921A

6307679
Installation
NOTE: Reference numbers and letters in parentheses
in the text refer to the callouts in the figures and the
parts drawings.
Mounting the Pump
Mount the pump to suit the type of installation planned.
See the Installation drawings on page 5. Also refer
to the Dimensions on page 23.
System Accessories
The Installation shown on page 5 is only a guide for
selecting and installing system components and acces-
sories. Contact your Graco distributor for assistance in
designing a system to suit your particular needs.
See page 22 for accessories available from Graco. To
ensure maximum pump performance, be sure that all
accessories used are adequately sized and pressure–
rated to meet the system’s requirements.
WARNING
Two accessories are required in your system: a
bleed–type master air valve (D) and a fluid drain
valve (E). These accessories help reduce the risk
of serious bodily injury including splashing 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
pump is shut off. Trapped air can cause the pump
to cycle unexpectedly and result in serious bodily
injury, including amputation. Locate the valve close
to the pump.
The fluid drain valve assists in relieving fluid pres-
sure in the displacement pump, hose, and gun/dis-
pensing valve when shutting off the pump. Trigger-
ing the gun/valve to relive pressure may not be
sufficient, especially if there is a clog in the hose or
gun/valve.
Air Line Accessories
Install the following accessories in the order shown in
the Typical Installation, using adapters as necessary:
An air line lubricator (B) provides automatic air
motor lubrication.
A bleed–type master air valve (D) is required in
your system to relieve air trapped between it and the
air motor when the valve is closed (see the WARN-
ING at left). Be sure the bleed valve is easily acces-
sible from the pump, and is located downstream
from the air regulator.
An air regulator (A) 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 bleed–type master air valve (D).
An air line filter (C) removes harmful dirt and
moisture from the compressed air supply.
A second bleed–type air valve (F) isolates the air
line accessories for servicing. Locate upstream from
all other air line accessories.
Fluid Line Accessories
A fluid drain valve (E) is required in your system to
relieve fluid pressure in the hose and gun (see the
WARNING at left).
Connect the Hoses
Connect a grounded air supply hose (G) to supply air
to the pump’s 1/4 npt(f) air inlet. Connect a grounded
fluid hose (H) to the 1/2 npt(f) fluid outlet.

7307679
Operation
Pressure Relief Procedure
WARNING
INJECTION HAZARD
Fluid under high pressure can be in-
jected 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. Shut off the air to the pump. If your pump has a
restrictor valve, close it also.
2. Close the bleed-type master air valve (required in
your system).
3. 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.
4. Open the drain valve (required in your system),
having a container ready to catch the drainage.
5. leave the drain valve open until you area ready to
spray/dispense again.
If you suspect that the fluid nozzle or hose is com-
pletely clogged, or that pressure has not been fully
relieved after following the steps above, very slowly
loosen the hose end coupling and relieve pressure
gradually, then loosen completely. Now clear the
nozzle or hose.

8307679
Operation
Starting and Operating the Pump
WARNING
To reduce the risk of serious bodily injury, including
splashing in the eyes or on the skin, and property
damage, never exceed the maximum air and fluid
working pressures of the lowest rated component
in your system. Refer to the Equipment Misuse
Hazard on page 2.
1. Mount the pump and connect to a fluid supply as
explained in Installation on pages 4–6.
2. See the Installation on page 4. Be sure the air
regulator (A) and bleed–type master air valve (D)
are closed.
3. Hold a metal part of the spray gun/dispensing
valve firmly to the side of a grounded metal pail
and hold the trigger open. Then open the pump’s
bleed–type master air valve (D). Now slowly open
the air regulator (A) until the pump starts.
4. Run the pump slowly until all the air is pushed out
of the pump and hose. Always use the lowest
pressure necessary to get the desired results.
Higher pressures waste fluid and cause premature
system wear.
5. After all the air is purged, release the gun/dispens-
ing valve trigger. This pump will not stall on either
stroke. It will continue to creep until the air supply
is shut off.
Never allow the pump to run dry of the fluid being
pumped. A dry pump will quickly accelerate to a high
speed, possibly damaging itself. If your pump acceler-
ates quickly, or is running too fast, stop it immediately
and check the fluid supply. If the supply container is
empty and air has been pumped into the lines, refill the
container and prime the pump and the lines with fluid,
or flush and leave it filled with a compatible solvent. Be
sure to eliminate all air from the fluid system.
Shutdown and Care of the Pump
For overnight shutdown, flush the pump and follow the
Pressure Relief Procedure at left . Always stop the
pump at the bottom of its stroke. Doing so helps
prevent damage to the throat packings caused by
buildup of dried fluid on the upper piston rod and
corrosion of the rod due to moisture.
NOTE: The pump is at the bottom of its stroke when
the air motor exhausts.
CAUTION
Water, even moist air, can cause your pump to
corrode. To help prevent corrosion, NEVER leave the
pump filled with water or air. After normal flushing,
flush the pump again with mineral spirits or oil–based
solvent, relieve pressure, and leave the mineral
spirits in the pump. Be sure to follow the Pressure
Relief Procedure at left.
Lubrication
If you are not using an accessory air line lubricator,
manually lubricate the motor daily. Disconnect the air
regulator, place about 15 drops of light machine oil in
the pump air inlet, reconnect the regulator, and turn on
the air supply to blow air into the motor.

9307679
Troubleshooting
NOTE: Check all possible problems and solutions before disassembling pump.
Problem Cause(s) Solution(s)
Pump fails to operate Dirty or worn air motor parts Clean and service; see manual
307851.
Restricted air line or inadequate air
supply
Clear; increase sir supply; check air
pressure (see Technical Data on
page 23).
Insufficient air pressure, closed or
clogged air valves
Increase air pressure; clear clogged
fluid hose or valve*.
Worn or damaged air or fluid valves
or seals
Replace valves or seals.
Pump operates but output low on
both strokes
Restricted or inadequate air supply Clear; increase air supply; check air
pressure (see Technical Data on
page 23).
Clogged fluid line, gun, etc. Open; clear*.
Exhausted fluid supply Refill; purge all air from pump and
fluid lines.
Worn or damaged air or fluid valves
or seals
Replace valves or seals.
Pump operates but output low on
downstroke
Worn or damaged air or fluid valves
or seals
Replace valves or seals.
Intake valve held open Clear; service if necessary.
Pump operates but low on upstroke Worn or damages air or fluid valves
or seals
Replace valves or seals.
Piston valve held open Clear; service if necessary.
Erratic or accelerated operation Exhausted fluid supply Refill; purge all air from pump and
fluid lines.
Broken air motor compression
spring
Replace; see manual 307851.
*To determine if the fluid hose or gun/valve is obstructed, follow the Pressure Relief Procedure on page 7. Dis-
connect the fluid hose and place a container at the pump fluid outlet to catch any fluid. If the pump starts when the
air is turned on, the obstruction is in the fluid hose or gun/valve.

10 307679
Notes

11307679
Displacement Pump Service (Model 218554)
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 7.
Before You Start
1. Repair Kit 223650 is available (see Parts Lists on
pages 19 and 21). For the best results, use all the
parts in the kit. Kit parts are marked with an aster-
isk, for example (204*).
2. Have all the necessary repair parts on hand.
Recommended spare parts are marked with a
checkmark in the parts list on pages 18–21 (for
example, 201fn).
3. Use a compatible solvent to clean parts. Inspect
parts for wear or damage and replace as needed.
4. Flush the pump if possible. Stop the pump at the
bottom of its stroke. Follow the Pressure Relief
Procedure Warning on page 7.
5. Disconnect the air and fluid hoses. Remove the
pump from its mounting. Clamp the pump in a
vise.
Servicing the Displacement Pump
Disassembly (See Fig. 2)
1. Unscrew the air motor connecting ring. Lay the
pump on its side and rotate the displacement
pump until the ball on the connecting rod (212)
comes free of the socket in the air motor piston
rod. Separate the air motor from the displacement
pump. Clamp the displacement pump outlet hous-
ing (215) in a vise.
NOTE: To service the air motor, refer to separate
manual 307851, supplied.
2. Unscrew the intake valve housing (201c) from the
outer displacement cylinder (207). Remove the pin
(201e) and ball (201fn) from the valve housing
(201c). Screw the relief valve housing (201d) out
of the intake valve housing and remove the spring
(201b) and ball (201a). See Fig 2. Thoroughly
clean all the parts, inspect for wear or damage and
replace as necessary.
3. Using wrenches on the flats of the upper piston rod
(211) and connecting rod (212), screw the con-
necting rod off the piston rod.
4. Remove the packing retainer (213) and the pack-
ing (214). Remove the o–ring (208). Push down on
the upper piston rod (211), grasp the fluid piston
(202) and pull the piston and piston rod out
through the bottom of the pump. See Fig 2.
5. Screw the fluid piston (202) out of the piston valve
housing (221) and remove the backup washer
(223), seal (204), and ball (222n). See Fig 2.
Thoroughly clean all the parts, inspect them for
wear or damage, and replace as necessary.
6. Unscrew the lower piston rod (205) from the
displacement piston (217) and upper piston rod
(211). Remove the backup washer (220), and seal
(219). Thoroughly clean all the parts, inspect them
for wear or damage, and replace as necessary.
7. Using a strap wrench, screw the bung adapter
(216) off of the pump outlet housing (215).
8. Screw the outer displacement cylinder (207) and
inner displacement cylinder (206) off the pump
outlet housing (215). Check the inner surfaces of
each cylinder for scoring or damage by running a
finger over the surface or holding the part up to the
light at an angle. Replace as necessary.
9. Screw the pump housing (210) out of the pump
outlet housing (215). Remove the o–rings (208 and
209).

12 307679
Displacement Pump Service (Model 218554)
Reassembly (See Fig. 2)
1. Install the two o–rings (208* and 209*) on the
pump housing (210). Screw the pump housing into
the pump outlet housing (215) and tighten secure-
ly.
2. Apply sealant to the threads of the inner displace-
ment cylinder (206) and screw it onto the pump
outlet housing (215). Do the same with the outer
displacement cylinder (207).
3. Screw the bung adapter (216) onto the outlet
housing (215) with a strap wrench.
4. Install the seal (219*) on the displacement piston
(217). See Fig 2. Install the backup washer (220)
with the groove facing up toward the seal. Apply
medium strength adhesive to the top threads of
the lower piston rod (205) and screw the rod into
the displacement piston (217). Torque to 20–25
ft-lb (27–34 N.m).
5. Install the seal (204*) on the fluid piston (202).
Install the backup washer (223) with the groove
facing down toward the seal. Apply sealant to the
threads of the piston (202) and piston valve hous-
ing (221). Place the ball (222n) on the piston seat,
and screw the piston into the housing. Torque to
45–50 ft-lb (61–68 N.m).
6. Carefully insert the upper piston rod (211) into the
bottom of the pump and push it all the way up until
its top flats protrude from the pump housing (210).
See Fig 2. Install the o–ring (208*) on the pump
housing (210). Slide the packing (214*) onto the
upper piston rod (211), with the lips of the packing
facing up. Screw the packing retainer (213) onto
the pump housing (210) and tighten securely.
7. Apply adhesive to the top threads of the upper
piston rod (211). Using wrenches on the flats,
screw the connecting rod (212) onto the upper
piston rod.
8. Install the spring (201b) and ball (201a) on the
relief valve housing (201d), and screw the valve
into the intake valve housing (201c). Place the ball
(201fn) in the intake housing (201c), and install
the stop pin (201e). Apply sealant to the threads of
the intake valve housing (201c) and screw it into
the outer displacement cylinder (207).
9. Lay the pump on its side and reconnect the ball of
the connecting rod (212) with the socket in the air
motor piston rod. Tighten the air motor connecting
ring.
10. Reinstall the pump on its mounting. If the ground-
ing wire was disconnected during service, recon-
nect it before operating the pump.

13307679
Displacement Pump Service (Model 218554)
TI1925A
Fig. 2
212
211
213
215
216
217
219*
204*
201e
201a
201b
201d
n201f
n222
210
*209
*208
*214
202
205
220
223
208*
206
207
201c
221
1
3
4
2
Lip of v–packing must face up.
1
Apply sealant to threads.
2
2
2
Grooves must face seal.
3
3
Torque to 20–25 ft-lb (27–34 NSm).
4
5
6
Apply sealant and torque to 20–25
ft-lb (27–34 NSm).
5
Apply sealant and torque to 45–50 ft-lb
(61–68 NSm).
6

14 307679
Notes

15307679
Displacement Pump Service (Model 223775)
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 7.
Before You Start
1. Repair Kit 223650 is available (see Parts Lists on
pages 19 and 21). For the best results, use all the
parts in the kit. Kit parts are marked with an aster-
isk (e.g., 404*).
2. Have all the necessary repair parts on hand.
Recommended spare parts are marked with a
double asterisk in the parts list on page 21 (e.g.,
401fn).
3. Use a compatible solvent to clean parts. Inspect
parts for wear or damage and replace as needed.
4. Flush the pump if possible. Stop the pump at the
bottom of its stroke. Follow the Pressure Relief
Procedure on page 7.
5. Disconnect the air and fluid hoses. Remove the
pump from its mounting. Clamp the pump in a
vise.
Servicing the Displacement Pump
Disassembly (See Fig. 3)
1. Unscrew the air motor connecting ring. Lay the
pump on its side and rotate the displacement
pump until the ball on the connecting rod (412)
comes free of the socket in the air motor piston
rod. Separate the air motor from the displacement
pump. Clamp the displacement pump outlet hous-
ing (415) in a vise.
NOTE: To service the air motor, refer to separate
manual 307851, supplied.
2. Unscrew the intake valve housing (401c) from the
outer displacement cylinder (407). Remove the pin
(401e) and ball (401fn) from the valve housing
(401c). Screw the relief valve housing (401d) out
of the intake valve housing and remove the spring
(401b) and ball (401a). See Fig. 3. Thoroughly
clean all parts, inspect for wear or damage, and
replace as necessary.
3. Using wrenches on the flats of the upper piston rod
(411) and connecting rod (412), screw the con-
necting rod off the piston rod.
4. Remove the packing retainer (413) and the pack-
ing (414). Remove the o–ring (408). Push down on
the upper piston rod (411), grasp the fluid piston
(402), and pull the piston and piston rod out
through the bottom of the pump. See Fig. 3.
5. Screw the fluid piston (402) out of the piston valve
housing (421) and remove the backup washer
(423), seal (404), and ball (422n). See Fig. 3.
Thoroughly clean all parts, inspect them for wear
or damage, and replace as necessary.
6. Unscrew the lower piston rod (405) from the
displacement piston (417) and upper piston rod
(411). Remove the backup washer (420) and seal
(419). Thoroughly clean all parts, inspect them for
wear, and replace as necessary.
7. Using a strap wrench, screw the bung adapter
(416) off of the pump outlet housing (415).
8. Screw the outer displacement cylinder (407) and
inner displacement cylinder (406) off the pump
outlet housing (415). Check the inner surfaces of
each cylinder for scoring or damage by running a
finger over the surface or holding the part up to the
light at an angle. Replace as necessary.
9. Screw the pump housing (410) out of the pump
outlet housing (415). Remove the o–rings (408*
and 409*).

16 307679
Displacement Pump Service (Model 223775)
Reassembly (See Fig. 3)
1. Install the two o–rings (408* and 409*) on the
pump housing (410). Screw the pump housing into
the pump outlet housing (415) and tighten secure-
ly.
2. Apply sealant to the threads of the inner displace-
ment cylinder (406) and screw it onto the pump
outlet housing (415). Do the same with the outer
displacement cylinder(407).
3. Screw the bung adapter (416) onto the outlet
housing (415) with a strap wrench.
4. Install the seal (419*) on the displacement piston
(417). See Fig. 3. Install the backup washer (420)
with the groove facing up toward the seal. Apply
medium strength adhesive to the top threads of
the lower piston rod (405) and screw the rod into
the displacement piston (417). Torque to 20–25
ft-lb (27–34 NSm).
5. Install the seal (404*) on the fluid piston (402).
Install the backup washer (423) with the groove
facing down toward the seal. Apply sealant to the
threads of the piston (402) and piston valve hous-
ing (421). Place the ball (422n) on the piston seat
and screw the piston into the housing. Torque to
45–50 ft-lb (61–68 NSm).
6. Carefully insert the upper piston rod (411) into the
bottom of the pump and push it all the way up until
its top flats protrude from the pump housing (410).
See Fig. 3. Install the o–ring (408*) on the pump
housing (410). Slide the packing (414*) onto the
upper piston rod (411), with the lips of the packing
facing up. Screw the packing retainer (413) onto
the pump housing (410) and tighten securely.
7. Apply adhesive to the top threads of the upper
piston rod (411). Using wrenches on the flats,
screw the connecting rod (412) onto the upper
piston rod.
8. Install the spring (401b) and ball (401a) on the
relief valve housing (401d), and screw the valve
into the intake valve housing (401c). Place the ball
(401fn) in the intake housing (401c), and install
the stop pin (401e). Apply sealant to the threads of
the intake valve housing (401c) and screw it into
the outer displacement cylinder (407).
9. Lay the pump on its side and reconnect the ball of
the connecting rod (412) with the socket in the air
motor piston rod. Tighten the air motor connecting
ring.
10. Reinstall the pump on its mounting. If the ground-
ing wire was disconnected during service, recon-
nect it before operating the pump.

17307679
Displacement Pump Service (Model 223775)
TI1926A
1
3
4
2
Lip of v–packing must face up.
Apply sealant to threads.
Grooves must face seal.
Torque to 20–25 ft-lb (27–34 NSm).
5
6
Apply sealant and torque to 20–25
ft-lb (27–34 NSm).
Apply sealant and torque to 45–50 ft-lb
(61–68 NSm).
412
411
413
408*
*414
410
*409
*408
415
416
431
430
406
417
407
420
419*
405
423
404*
402
401a
401b
401d
n401f
421
n422
401e
401c
1
2
2
3
4
5
2
6
7Grooves must face packing.
7
Fig. 3

18 307679
Parts
1
17
Model 218556, Series C
With Stainless Steel Displacement Pump
(Includes items 1–21)
Ref.
No. Part No. Description Qty.
1 204722 MOTOR, air 1
See manual 307851
17 218554 DISPLACEMENT PUMP ASSY. 1
20 172477 TAG, warning (not shown) 1
21 181387 LABEL, warning (not shown) 1
TI1927A

19307679
Parts
TI1923A
Model 218554, Series B
With Stainless Steel Displacement Pump
(Includes items 201–229)
Ref.
No. Part No. Description Qty.
201 217191 VALVE, intake
Includes items 201a–201f 1
201a 101956 .BALL; 1/4 in. dia.; sst 1
201b 106256 .SPRING, compression 1
201c 179941 .HOUSING, valve, intake 1
201d 179942 .HOUSING, valve, relief 1
201e 164250 .PIN, stop, ball 1
201fn101917 .BALL; 7/8 in. dia.; sst 1
202 180415 PISTON, fluid 1
204* 186399 SEAL, piston; UHMWPE 1
205 180413 ROD, piston, lower 1
206 180417 CYLINDER, displacement, inner;
sst 1
207 198574 CYLINDER, displacement, outer;
sst 1
208* 106553 PACKING, o–ring; Vitonr2
209* 107563 PACKING, o–ring; Vitonr1
210 180438 HOUSING, pump 1
211 180433 ROD, piston, upper 1
212 180440 ROD, connecting 1
213 180414 RETAINER, packing 1
214* 108831 V–PACKING, block; PTFE, r
polyacetal, polyester elastomer 2
215 180419 HOUSING, outlet, pump 1
216 180439 ADAPTER, bung 1
217 180416 PISTON, displacement 1
219* 186398 SEAL, piston; UHMWPE 1
220 180412 WASHER, backup 1
221 161791 HOUSING, valve, piston 1
222n101750 BALL; 1/2 in. dia.; sst 1
223 180411 WASHER, backup 1
228 104029 LUG, grounding 1
229 104582 WASHER, tab 1
214*
212
213
*208
210
228
229
209*
208*
215 206
216
207
211
217
*219
220
205
221
n222
223
204
202
n201f
201c
201e
201a
201b
201d * The replacements for these parts are avail-
able in Repair Kit 223650. Purchase this kit
separately.
nKeep these spare parts on hand to reduce
down time.

20 307679
Parts
Model 223777, Series A
With Stainless Steel Displacement Pump
(Includes items 1–21)
Ref.
No. Part No. Description Qty.
1 204722 AIR MOTOR
See manual 307851 for parts 1
17 223775 DISPLACEMENT PUMP ASSY
See page 21 for parts 1
20 172477 TAG, warning (not shown) 1
21 181387 LABEL, warning (not shown) 1
1
17
TI1928A