Graco 237367 Operation manual

Instructions – Parts List
GRACO INC.ąP.O. BOX 1441ąMINNEAPOLIS, MNą55440-1441
Copyright 2002, Graco Inc. is registered to I.S. EN ISO 9001
STAINLESS STEEL
Dura–Flot750 Pumps
With Severe–Duty Rod and Cylinder
Patent No. 5,456,583
Foreign Patents Pending
308418G
Read warnings and instructions.
See page 2 for model numbers and maximum
working pressures.
Model 237367
Model 237635 TI0483
TI0483
Parts

2 308418
List of Models
Pump Part No.
and Series Pump Model
Displacement
Pump Part No.
and Series Ratio
Maximum Fluid
Working Pressure
Maximum Air
Input Pressure
237635,
Series B
Kingt236456,
Series B
68:1 46.9 MPa, 469 bar
(6800 psi)
0.7 MPa, 7 bar
(100 psi)
236460,
Series B
Reduced Icing
Quiet Kingt
236456,
Series B
68:1 46.9 MPa, 469 bar
(6800 psi)
0.7 MPa, 7 bar
(100 psi)
237367,
Series A
Bulldogr236456,
Series B
33:1 22.8 MPa, 228 bar
(3300 psi)
0.7 MPa, 7 bar
(100 psi)
237613,
Series A
Reduced Icing
Quiet Bulldogr
236456,
Series B
33:1 22.8 MPa, 228 bar
(3300 psi)
0.7 MPa, 7 bar
(100 psi)
Table of Contents
Warnings 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation/Maintenance 10. . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Chart 13. . . . . . . . . . . . . . . . . . . . . . . . .
Service 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Tools 14. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disconnecting the Displacement Pump 14. . . . . . .
Reconnecting the Displacement Pump 14. . . . . . . .
Displacement Pump Service 16. . . . . . . . . . . . . . . .
Parts Drawings and Parts Lists 21. . . . . . . . . . . . . . . . . .
Pump Assemblies 21. . . . . . . . . . . . . . . . . . . . . . . . . .
Displacement Pump 23. . . . . . . . . . . . . . . . . . . . . . . .
Technical Data 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting Hole Layout 27. . . . . . . . . . . . . . . . . . . . . . . . . .
Warranty 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Information 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

308418 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 of the lowest rated system component. Refer to the
Technical Data on pages 25–26 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 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.

4 308418
WARNING
INJECTION HAZARD
Spray from the gun, hose leaks, or ruptured components can inject fluid into your body and cause
extremely serious injury, including the need for amputation. 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 medi-
cal attention.
DDo not point the gun at anyone or at any part of the body.
DDo not put your hand or fingers over the spray tip.
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 gun when spraying.
DCheck the gun diffuser operation weekly. Refer to the gun manual.
DBe sure the gun trigger safety operates before spraying.
DLock the gun trigger safety when you stop spraying.
DFollow the Pressure Relief Procedure on page 10 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.
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 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 10 to prevent the
equipment from starting unexpectedly.

308418 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 7.
DIf 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.
DProvide fresh air ventilation to avoid the buildup of flammable fumes from solvents or the fluid
being sprayed.
DKeep the spray area free of debris, including solvent, rags, and gasoline.
DElectrically disconnect all equipment in the spray area.
DExtinguish all open flames or pilot lights in the spray area.
DDo not smoke in the spray area.
DDo not turn on or off any light switch in the spray area while operating or if fumes are present.
DDo 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.
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 308418
Notes

308418 7
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 Acces-
sories, available from your Graco distributor. Refer to
Product Data Sheet, Form No. 305722 (Bulldog
Pumps) or Form No. 305723 (King Pumps). If you
supply your own accessories, be sure they are ade-
quately 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 AND EXPLOSION
HAZARD 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 the
wire to a true earth ground. Order Part No. 222011
Ground Wire and Clamp.
Bulldog 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.
Fig. 1 TI1052
Y
Z
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: ground through connection to a prop-
erly 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 continu-
ity.
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
Fig. 3 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.
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 27.
If you are using a floor stand, refer to its separate
manual for installation and operation instructions.

8 308418
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.
The fluid drain valve assists in relieving fluid pres-
sure in the displacement pump, hose, and gun.
Triggering the gun to relieve pressure may not be
sufficient. Order Part No. 235992.
Air Line Accessories
Install the following accessories in the locations shown
in Fig. 3, using adapters as necessary:
DAn air line lubricator (D) provides automatic air
motor lubrication.
DAbleed-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 eas-
ily accessible from the pump, and is located
downstream from the air regulator.
DAn 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.
DApump 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.
DAn 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.
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 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:
DA fluid filter (L) with a 60 mesh (250 micron)
stainless steel element, to filter particles from the
fluid as it leaves the pump.
DA fluid drain valve (M), which is required in your
system, helps relieve fluid pressure in the hose
and gun (see the WARNING at left).
DA gun (S) dispenses the fluid. The gun shown in
Fig. 3 is an airless spray gun for light to medium
viscosity fluids.
DA gun swivel (R) allows freer gun movement.
DA 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.

308418 9
Installation
TI0484
Fig. 3
KEY
APump
BWall Bracket
CPump Runaway Valve
DAir Line Lubricator
EBleed-Type Master Air Valve
(required, for pump)
FPump Air Regulator
GAir Manifold
HElectrically Conductive
Air Supply Hose
JAir Line Filter
KBleed-Type Master Air Valve
(for accessories)
LFluid Filter
MFluid Drain Valve (required)
NElectrically Conductive
Fluid Supply Hose
PFluid Whip Hose
RGun Swivel
SAirless Spray Gun
TSuction Kit
YGround Wire and Clamp
(required; see page 7
for installation instructions)
WAir Line Drain Valve
TYPICAL INSTALLATION
A
B
C
D
E
F
G
H
JK
M
N
P
Y
MAIN AIR LINE
L
R
S
T
W

10 308418
Operation/Maintenance
Pressure Relief Procedure
WARNING
INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure
whenever you:
Dare instructed to relieve the pressure,
Dstop spraying,
Dcheck or service any of the system equipment,
Dor install or clean the spray tips.
1. Lock the gun trigger safety.
2. Shut off the air supply to the pump.
3. Close the bleed-type master air valve (required in
your system).
4. Unlock the gun 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 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.
Packing Nut/Wet-Cup
Before starting, fill the packing nut (8) 1/3 full with
Graco Throat Seal Liquid (TSL) or compatible solvent.
See Fig. 4.
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 61–75 NSm (45–55 ft-lb) using the supplied
wrench (110). Do this whenever necessary. Do not
overtighten the packing nut.
TI0485
Fig. 4
110
81
Model
237367
Shown
1Torque to 61–75 NSm
(45–55 ft-lb)

308418 11
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).
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.
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 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.
9. 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.
In a circulating system, the pump will speed up or
slow down on demand, until the air supply is shut
off.
WARNING
COMPONENT RUPTURE HAZARD
To reduce the risk of overpressurizing
your system, which could cause compo-
nent rupture and serious injury, never
exceed the specified Maximum Incoming Air Pres-
sure to the pump (see the Technical Data on
pages 25 and 26).
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.

12 308418
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 ex-
posed 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 flush-
ing pails are properly grounded. Refer to
Grounding on page 7.
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.
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.

308418 13
Troubleshooting Chart
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. Check all possible causes and problems before
disassembling the pump.
PROBLEM CAUSE SOLUTION
The pump fails to oper-
ate.
Valves are closed or clogged. Clear the air line; increase the air supply.
Check that the valves are open.
The fluid hose or gun is obstructed. Clear the hose or gun*;
use a hose with a larger ID.
Fluid has dried on the displacement rod. Clean the rod; always stop the pump at the bottom
of its stroke; keep the wet-cup 1/3 filled with a
compatible solvent.
Air motor parts are dirty, worn, or dam-
aged.
Clean or repair the air motor;
see the separate motor manual.
The pump operates,
but the output is low on
both strokes.
The air line is restricted or the air supply
is inadequate. Valves are closed or
clogged.
Clear the air line; increase the air supply.
Check that the valves are open.
The fluid hose or gun is obstructed;
the fluid hose ID is too small.
Clear the hose or gun*;
use a hose with a larger ID.
Worn packings in the displacement
pump.
Replace the packings.
Air motor parts are dirty, worn, or dam-
aged.
Clean or repair the air motor;
see the separate motor manual.
Held open or worn intake valve. Clear or service the intake valve.
The pump operates,
but the output is low on
the downstroke.
Held open or worn intake valve. Clear or service the intake valve.
The pump operates,
but the output is low on
the upstroke.
Held open or worn piston valve
or packings.
Clear the piston valve; replace the packings.
The pump’s speed is
erratic or accelerated.
The fluid supply is exhausted. Refill the supply and prime the pump.
Held open or worn piston valve
or packings.
Clear the piston valve; replace the packings.
Held open or worn intake valve. Clear or service the intake valve.
* To determine if the fluid hose or gun is obstructed, relieve the pressure. 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.
NOTE: If you experience air motor icing, call your Graco distributor.

14 308418
Service
Required Tools
DSet of adjustable wrenches
DLarge pipe wrench
D2–3/4 in. socket wrench
DTorque wrench
DRubber mallet
DO-ring pick
DLarge vise
DPlastic or wooden block, approximately
6 in. square x 1 in. thick
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 10.
2. Relieve the pressure.
3. Disconnect the air hose and 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 two people when lifting, moving, or
disconnecting the entire 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), only one
person is required. The displacement pump weighs
approximately 14 kg (30 lb).
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.
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. 5.
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 16 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. 5.
2. Have one person 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. Posi-
tion the displacement pump (109) on the tie rods
(105).
3. Screw the nuts (108) onto the tie rods (105) and
torque to 68–81 NSm (50–60 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 195–210 NSm
(145–155 ft-lb).
5. Reconnect all hoses. Reconnect the ground wire if
it was disconnected. Fill the packing nut (8) 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 (8) to
61–75 NSm (45–55 ft-lb).

308418 15
Service
TI0486
Fig. 5
1
2Torque to 195–210 NSm (145–155 ft-lb)
101
109
108
107
105
106 110
8
1
2
1
V
U
W
3Torque to 68–81 NSm (50–60 ft-lb)
3
3
Model 237367 Shown
Torque to 61–75 NSm (45–55 ft-lb)

16 308418
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 24.
1. Place the pump lengthwise in a large vise, with the
jaws on the outlet housing (6) as shown in Fig. 6.
Using the supplied wrench (110), loosen, but do
not remove, the packing nut (8).
2. Using a 2–3/4 in. socket or a pipe wrench, un-
screw the intake valve (5) from the intake housing
(7). Be careful to catch the intake ball (13) as you
remove the intake valve, so that it does not fall and
suffer damage. Remove the seal (11) from the
intake valve. Inspect the ball and the seat (D) of
the intake valve for wear or damage.
3. Using a pipe wrench, remove the intake housing
(7) from the cylinder (2).
NOTE: These instructions are written with the pump
separating at joint A. If it separates at joint B, disas-
semble it at that joint, place the intake housing (7) in a
vise, and continue with step 4.
4. Using a pipe wrench, unscrew the cylinder (2). The
displacement rod (1) may come with the cylinder.
TI0487
Fig. 6
1
8
62
7
5
A
B
1
1
D
13*
11*
2
2
1Torque to 325–353 NSm (240–260 ft-lb).
2Lubricate.
3Torque to 190–217 NSm (140–160 ft-lb).
3

308418 17
Service
CAUTION
To reduce the possibility of costly damage to the rod
(1) and cylinder (2), always use a plastic or wooden
block to help drive the rod out of the cylinder. Never
hit the rod with a hammer.
5. Turn the cylinder (2) upside down and strike the
top of the rod (1) on a plastic or wooden block until
the piston comes free. Pull the rod and piston from
the cylinder, being careful not to scratch the parts.
See Fig. 7.
04518
1
2
Fig. 7
6. Shine a light into the cylinder (2) to inspect the
inner surface for scoring or wear. Remove the two
seals (11) from the cylinder.
7. Place the flats of the piston seat housing (10) in a
vise, as shown in Fig. 8.
8. Using an adjustable wrench, unscrew the piston
ball housing (9) from the piston seat housing. Be
careful to catch the piston ball (12) as you sepa-
rate the piston seat housing and ball housing, so
that it does not fall and suffer damage.
9. Examine the displacement rod (1) for scratches or
other damage. Only if the rod needs replace-
ment, place the piston ball housing (9) in a vise
and unscrew the rod, using an adjustable wrench
on the flats of the rod.
10. Remove the glands and v-packings (P) and the
ball (12) from the piston seat housing (10). Inspect
the ball seat (E) and ball guides (F) for wear or
damage. See Fig. 10.
11. Unscrew the packing nut (8) from the outlet hous-
ing (6). Remove the glands and v-packings (T).
See Fig. 10.
12. Clean all parts with a compatible solvent and
inspect them for wear or damage.
0449404495
Fig. 8
1
1
9
Torque to 258–285 NSm (190–210 ft–lb).
1
1
9
1
12*
10
10 1

18 308418
Service
Reassembly
1. If it was necessary to remove the piston ball
housing (9) from the displacement rod (1), clean
the threads of the rod and the ball housing, and
apply thread sealant. 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 258–285
NSm (190–210 ft-lb). See Fig. 10.
2. For standard displacement pump 236456, place
the piston packings on the piston seat housing (10)
in the following order, with the lips of the v-pack-
ings facing up: the female gland (4*), one PTFE r
v-packing (18*), four leather v-packings (19*), and
the male gland (3*). See the Piston Packing Detail
in Fig. 10.
NOTE: To convert the pump to a different packing
material, see page 24.
3. Place the flats of the piston seat housing (10) in a
vise. Place the ball (12*) on the seat. Screw the
piston ball housing (9) onto the piston seat housing
hand tight, then torque to 258–285 NSm (190–210
ft-lb). See Fig. 8.
4. For standard displacement pump 236456, lubricate
the throat packings and place them in the outlet
housing (6) in the following order, with the lips of
the v-packings facing down: the male gland (3*),
four leather v-packings (19*), one PTFErv-pack-
ing (18*), and the female gland (4*). See the
Throat Packing Detail in Fig. 10.
NOTE: To convert the pump to a different packing
material, see page 24.
5. Lubricate the threads of the packing nut (8), and
loosely install it in the outlet housing (6).
6. Lubricate the piston packings. Slide the displace-
ment rod (1) and piston assembly down into the
cylinder (2). 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
(10) is located in the middle of the cylinder.
7. Install the seal (11*) on the top of the cylinder (2).
Lubricate the seal and the top threads of the
cylinder.
8. Place the outlet housing (6) in a vise, as shown in
Fig. 9. Slide the displacement rod (1) up into the
outlet housing, then screw the cylinder (2) into the
outlet housing handtight. The threads will engage
easily until the seal (11*) contacts the sealing
surface of the outlet housing. The top of the rod
will protrude from the packing nut (8).
Fig. 9
TI0487
1
8
62
7
5
1Torque to 325–353 NSm (240–260 ft-lb).
1
1
11*
2Lubricate.
2
3Torque to 190–217 NSm (140–160 ft-lb).
3

308418 19
Service
05468
Fig. 10
1
*11
5
13*
10
9
D
E
T
P
8
6
2
*11
*12
7
8 (Ref)
*4
*19
*3
6 (Ref)
4
4
4
3
3
2
1
8
Throat Packing Detail
(Displacement Pump 236456 Shown;
see page 24 for options.)
S
7
F
Piston Packing Detail
(Displacement Pump 236456 Shown;
see page 24 for options.)
*18
*114
10
9 (Ref) 2 (Ref)
10 (Ref)
*3
*19
*4
7 (Ref)
*11 (Ref)
4
6
*18
1
2
3
4
Torque to 61–75 NSm (45–55 ft-lb).
Torque to 325–353 NSm (240–260 ft-lb).
Torque to 258–285 NSm (190–210 ft-lb).
Lubricate.
6
7
8
Lips face up.
Lips face down.
See the Throat Packing Detail at left.
See the Piston Packing Detail at left.
10 Torque to 190–217 NSm (140–160 ft-lb).
9
9

20 308418
Service
9. Install the seal (11*) on the intake valve (5). Lubri-
cate the seal and the threads of the intake valve.
10. One end of the intake housing (7) has a rounded
ball cavity (S) on the inside (see Fig. 10). Install
the ball (13*) in this cavity, then screw the intake
valve (5) into the intake housing handtight. See
Fig. 11. The threads will engage easily until the
seal contacts the sealing surface of the intake
housing.
04493A
7
5
13*
2
1
Fig. 11
1
2
11* 2
Lubricate.
Orient so the end with the ball cavity (S, see Fig.
10)
faces the ball (13*).
11. Install the seal (11*) on the bottom of the cylinder
(2). See Fig. 9. Lubricate the seal and the threads
of the cylinder. Screw the intake housing (7) onto
the cylinder handtight. The threads will engage
easily until the seal contacts the sealing surface of
the intake housing.
12. Using a pipe wrench, torque the intake housing (7)
to 325–353 NSm (240–260 ft-lb). This will also
torque the cylinder (2) into the outlet housing (6).
See Fig. 9.
13. Using a 2–3/4 in. socket or a pipe wrench, torque
the intake valve (5) to 190–217 NSm (140–160
ft-lb).
14. Torque the packing nut (8) to 61–75 NSm (45–55
ft-lb).
15. Reconnect the displacement pump to the air motor
as explained on page 14.