Graco Presiden 237 Operation manual

INSTRUCTIONS-PARTS LIST
1 @ ,Thismanualcontains irnpo&T
warnings andInformation.
READ AND KEEP FOR REFERENCE.
INSTRUCTIONS
3:l Ratio President@
Model 237-526
For LubricatingProducts
540 psi (37 bar) Maximum Working Pressure
180 psi (12 bar) Maximum Air input Pressure
A CAUTION I
This pump is designedto pump lubricating fluids
only.
Table of Contents
Warnings ................... .. .. .... ... .. ... ... 2
Operation ....... . . .... . . . . ..:. . . . ..... . . ...... 8
Installation .......... .. . . .. . . . ......... . ....... 5
Troubleshooting Guide . . . ..... . .. . . . ... ...... ... 9
Air Motor and Throat Service . .. .... .. .. .. ..
. . . . 10
Air Motor Parts Drawing ..... .. , ...... . . . ...
...
. 14
Displacement Pump Service . . . .. . .. ........
....
13
Air Motor Parts List . . . .. . , . .. .. ..... . . . . ,, .
. .. . 15
Displacement Pump Parts Drawing and List ..
. ... 16
Technical Data ........ . ... . ..... .. ..... .. .
:. ..
19
Dimensions.. . . . . .. . ...... . . ....... . .. . . . .
...
. 18
Warranty .. . .. . . .. . . . . .. ....... ... .. .. .. ..
.
.. . 20
Graco PhoneNumber.. . . .. ...... .. .. .. .... .. .. 20
e 308-485
~~
Rev.C
GRAco Supersedes Rev. B
Pump
1 1
GRACOINC. P.O. BOX 1441 MINNEAPOLIS, MN 55440-1441
@COPYRIGHT 1995, GRACO INC.
Graco Inc. is registered to I.S. EN IS0 9001

Sym bok
Warning Symbol Caution Symbol
This symbol alerts youtothe possibility of serious This symbol alerts you to
the possibility of damage to
injury or death
if you do not follow the instructions. or destructionof equipment if you do not follow the
instructions.
EQUIPMENT MISUSE HAZARD
Equipment misuse can cause the equipment to rupture or malfunction and resultinserious injury.
0 This equipment is for professional use only.
0 read allinstructionmanuals,tags,andlabelsbeforeoperatingtheequipment. i
0 Use the equipment only for its intended purpose. If you are not sure, call your Graco distributor.
Do not alter or modify this equipment.
0 Check equipment daily. Repair or replace wom or damaged parts immediately.
0 Do not exceed the maximum working pressure stated on the equipment orin theTechnicalData
section of the instruction manual for your equipment.
Do not exceed the maximum working
pressure of the lowest rated componentinyour system.
0 Use fluids and solvents that are compatible with the equipment welted parts. Refer to the
Technical
Data section ofall equipment manuals. Read the fluid and solvent manufacturer's
warnings.
0 Do not use l,l,l-trichloroethane, methylene chloride, other halogenated hydrocarbon solvents,
chemical reaction, with the possibility of explosion.
or fluids containing such solvents
in pressurized aluminum equipment. Such use could resultina
Handle hoses'carefully. Do not pull on hosesto move equipment.
Route hoses away from traffic areas, sharp edges, moving parts, and hot surfaces. Do not
expose Graco hoses to temperatures above
82' C (180' F) or below -40° C (40' F).
Do not lift pressurizedequipment.
Comply withall applicable local, state, and national fire, electrical, and safety regulations.

INJECTION HAZARD
Fluid from the dispensing valve, leaks, or ruptured components can inject fluid into your body and
cause extremely serious Injury, including the need for amputation. Fluid splashed in the eyesoron
the skin can also cause serious injury.
0 Fluid injected into the skin may look like just a cut, butit isa serious injury. Getimmediate
medicalattention.
0 Do not pointthedispensing valve at anyone or at any partof the body.
0 Do not put your hand or fingers over the end of the dispensing valve.
0 Do not stop or deflect leaks with your hand, body, glove, or rag.
0 Use only extensions and no-drip tips that are designed for use with your dispensing valve.
0 Do not use a low-pressure flexible nozzle with this equipment.
Follow the Pressure ReliefProcedure on page 8 if the dispensing valve clogs and before
cleaning, checking, or servicing the equipment.
..
Tighten all fluid connections before operating the equipment.
D Check the hoses, tubes, and couplings daily. Replace worn or damaged parts immediately. Do
not repair high pressure couplings: you must replace the entire hose.
D Fluidhoses must have spring guards on both ends to help protect them from rupture causedby
kinks or bends near the couplings.
4AZARDOUS FLUIDS
ieath from splashinginthe eyes, ingestion,orbodily contamination.
mproper handling of hazardous fluids
or inhaling toxic fumes can cause extremely serious injury or
1 Know the specific hazards of thefluid youare using.
1 Store hazardous fluid in an approved container. Dispose of hazardous fluid according to all local,
state, and national guidelines.
1 Always wear protective eyewear. gloves, clothing, and respirator as recommended by the fluid
and solvent manufacturer.
308-485 3

FIRE AND EXPLOSION HAZARD
Improper grounding, poor ventilation,open flames, or sparks can cause a hazardous condition and
result
in a fire or explosion and serious injury.
Ground the equipment and the object being lubricated. Refer toGroundingon page 7.
0 If there is any static sparkingor you feel an electric shock while using this equipment,stop
dispensingImmediately.
Do not use the equipment until you identify and correct the problem.
0 Provide fresh air ventilation to avoid the buildupof flammable fumes from solventsor the fluid
being dispensed.
0 Keep the dispensing area free of debris, including solvent, rags, and gasoline.
0 Before operating this equipment, electrically disconnect all equipment in the dispensing area.
0 Before operating this equipment, extinguishall open flames or pilot lights in the dispensing area.
Do not smoke in the dispensing area.
0 Do not turn on or off any light switch in the dispensing area while dispensingor while there are
any fumesin theair.
0 Do not operate a gasoline engine in the dispensing area.
MOVING PARTS HAZARD
Moving parts, such as !he airmoior piston, can pinchor amputate your fingers.
Keep clear ofall moving parts when starting or operating the pump.
0 Before servicing the equipment, follow thePressureRelief Procedureon page 8 to prevent the
equipment from starting unexpectedly.
..
Manual Change Summary
This manual was changed from Rev. B to Rev. C to reflect the following changes to the pump:
0 The grounding lug (7) has been moved from just below theair motor cylinder dome to just above the flange on
the air motor base.
0 The cylinder cap nut (24) has been replaced witha lift ring.
4 308-485

Installation
The typical installation shown in Fig. 1 is only a guide for selecting and installing a pump; it is not an actual system
design. Contact your Graco representative
for assistance in designing a system to suit your needs.
For portable applications
KEY
A Bleed-typemasterairvalve(required)
B Airline filter
C Air regulatorandgauge
D Pumprunawayvalve(shownfor
position) notneededifyou use
a low-levelcut-ofl valve
E Air Inlet
H Fluiddrainvalve(required)
0 Pump(Model237-526shown)
J Dispensingvalve(Model 222411 shown)
L Male quickdlsconnectfifing
K Thermal reliefkit(required) 237-601
M Female quickdisconnectcoupler
N Alr line lubricator
S FluldInlet, 1 1/2" npt
P Fluidhose
Y Ground wlre (required)
R Electricallyconductive air hose (218493shown]
Fig. 1
308-485 5

Installation
System Accessories
A CAUTION I
inlet (E). The fittings are not strong enough to
Do not hang the air accessories directly on the air
support the accessories and may cause one or
mount the accessories.
more
to break. Provide a bracket on which to
Three accessories arerequiredin your system: an
air bleed device, a fluid drain valve, and a thermal
relief kit. These accessories help reduce the risk
of serious bodily injury including fluid injection,
splashinginthe eyesor on the skin, andinjuly
from moving parts
if you are adjusting or repairing
the pump.
The air bleed device relieves air trapped betweenit
and the air motor after the air supply is shut
off.
Trapped air can cause the air motor to cycle unex-
pectedly, causing serious bodily injuryifyou are
adjusting or repairing the pump. Use either a
bleed-type master air valve
(A) or a quick discon-
nect coupler
(M) and fitting (L). Installitnear the
pump air inlet, within easy reach
of the pump.
The fluid drain valve
(H) assists in relieving fluid
pressure
in the displacement pump, hoses and
dispensing valve. Triggering the valve
to relieve
pressure may not be sufficient.
The thermal relief kit
(K) relieves pressure in the
fluid
line caused by heat expansion.
Install the following accessories in the order shown in
Fig.1:
0 Install an air line lubricator (N) for automatic air
motor lubrication.
0 Install a bleed-type master air valve (A) to relieve
air trapped betweenitand the motor when the
valve isclosed.
As an alternative, you can install
an air line quick disconnect coupler
(M) and fitting
(L) to serve as an air-bleed device. See Detail A in
Fig.1.
To order a 1P npt, 300 psi (21 bar)
Maximum Working Pressure bleed-type masterair
valve, order Parf
No. 107-142.
Install the air regulator (C) to control pump speed
and pressure.
Install an air line filter (E) to remove harmfuldirt
and contaminants from your compressedair supply.
Install another bleed-type master air valve
(A) to
isolate the accessories for servicing.
0 Install a fluid drain valve (H) near the pump fluid
outlet
to relieve fluid pressure in the hose and gun
when the valveisopened.
To orderaW8"npt
(mbe)
fluid drain valve, order Part No. 210-658.
0 Install a suitable fluid hose(P) and dispensing valve
(J).
Install a thermal relief kit (K) to relieve pressure in
the fluid line caused by heat expansion.
To order a
600 psi (42 bar) minimumreliefpressure, 630 psi
(44 bar) maximum relief pressure thermal relief kit,
orderPart
No. 237-601.
6 308-485

Installation
Grounding
safe system.
Proper grounding Is an essential part of maintaining a
To reduce the risk of static sparking, ground the pump.
Check your local electrical code for detailed grounding
sure
to groundallof the following equipment:
instructions for your area and
type of equipment. Be
Pump: Use a ground wire and clamp as shown to
the right.
0 Airand Nuid hoses: Use only electrically
conductive hoses.
0 Air compressor:Followmanufacturer’s
recommendations.
0 Nuid supp/y container: According to local code.
To maintain grounding continuiiy when flushing or
valve firmiy to the side ofa grounded metal pail.
relieving pressure, always hold a metal part
of the
then trigger the valve.
To ground the pump, loosen the grounding lug
gauge
(1.5 mm2) minimum ground wire (Y) into the slot
locknut (W) and washer (X).~ Insert one endof a 12
inthe grounding lug (2) and tighten the locknut
securely. Connect the other end of the wire to a true
earth ground.
To order a ground wireandclamp, order
Part
No. 222411.
Fig. 2
06W4

Operation
Pressure Relief Procedure
INJECTION HAZARD
To reduce the risk of serious bodily
injury, including fluid injection or splash-
follow this procedure whenever you shut
off the
ing in the eyes or on the skin, always
pump, when checking or servicing any part of the
system, when installing or changing dispensing
devices, and whenever you stop dispensing.
1. Close the pump air regulator and the bleed-type
master air valve (required in your system).
2. Hold a metal partof the dispensing valve firmly to
valve to relieve the fluid pressure, or open the
a grounded metal waste container and trigger the
drain valve
(H).
Startup and Adjustment
,
COMPONENT RUPTURE HAZARD
The maximum working pressure of each
component in the system may not be the
same. To reduce the risk of overpres-
surizing any component
in the system, be sure you
component. Never exceed the maximum working
know the maximum working pressure of each
system. Overpressurizing any component can
pressure of the lowest rated componentinthe
and serious injury.
result inrupture, fire, explosion, property damage,
To determine the fluid output pressure using theair
regulator reading, multiply the ratio ofthepump by
the
air pressure shown on the regulator gauge. For
example:
3 (A) ratio x 180 psi air =
540 psi fluid output
[3 (3) ratio x 7 bar air = 21 bar fluid output]
Limit the air
to the pump so that no air line or fluid
line component or accessory is overpressurized.
1. With the air regulator (C) closed, open the
bleed-type master air valves(A), or,
if so
equipped, join the quick disconnect coupler (M) to
the male fitting (L).
2. Open the dispensing valve (J) into a grounded
contact between the container and valve.
metal waste container, making firm metal-to-metal
3. Open the pump air regulator (C) slowly, just until
the pump is running. When the pump is primed
and
all air has been pushed out of the lines, close
the dispensing valve.
NOTE: When the pump is primed, and with sufficient
air supplied, the pump starts when the
dispensing valveisopened and shuts
off when
it isclosed.
4. Adjust the air regulator until you get sufficient flow
at the lowest speed necessary to get the desired
from the dispensing valve. Always run the pump
pressure of any componentinthe system.
results.
Do not exceed the maximum working
NOTES:
Never allow the pump to run dryof the fluid being
pumped.
A dry pump will quickly accelerate to a
high speed, possibly damaging itself. If your pump
accelerates quickly, or is running
too fast, stop it
immediately and check the fluid supply. If the
supply containeris empty and air has been pumped
into the lines, prime the pump and lines with fluid,
or flushitand leaveitfilled with a compatible
solvent.
Be sure to eliminateallair from the fluid
lines.
Read and follow the instructions supplied with each
component in your system.
If the pump will be unattended for any period of
time, or to shut off the system at the end of the
work shift, always follow thePressureRelief
Procedureat
left.

Troubleshooting
.
INJECTION HAZARD
To reduce the risk of serious bodily
injuiy, including fluid injection or splash-
ing
in the eyes oronthe skin, always
follow thePressureRelief Procedureon page
8
whenever you shut off the pump, when checkingor
servicing any part
of the system, when installing or
changing dispensing devices, and whenever you
stop dispensing.
Problem Solution Cause
Pumpfails
to operate I Inadequateairsupplypressureor I Increaseairsupply;clear
Continuous air exhaust
restricted air lines
valve
Closed or clogged dispensing
Clear'
Clogged fluid lines, hoses, valves,
Open; clean
etc.
Damaged air motor Service air motor
Exhausted fluid supply Refill and reprirne or flush
Wom or damaged air motor gas- Service air motor
ket, packing, seal, etc.
-
I
Erratic pump operation Exhaustedfluidsupply
1 Refillandreprimeorflush
HeldoDenorworn intake valveor
1 Clear:sewice
I pistonbackings
PumooDerates.butoutoutlowon
I HeldoDenDistonvalveorworn I Clear:service
up siroie
down stroke Held open or worn intake valve
Pump operates, but output low on pistonpacings
restricted air lines both strokes Increase air supply; clear Inadequate air supply pressure or Pump operates, but output low on
Clear; sewice
Closed or clogged valves Open; clean
* Follow thePressureRelief Procedureon page 8. and disconnect the fluid line. If the pump starts when
the air is tumed on again, the line, hose, valve, etc., is clogged.
308-485 9

Air Motor and Throat Service
Before You Start
0 Be sure you have all necessary parts on hand.
Air MotorRepair Kit 207485includes repair parts
for themotor. Use allthe parts
in the kitforthe
with one asterisk, for example(19.).
in the text and
best results. Parts included in the kit are marked
drawings. See the PartsListon pagel5.
Two accessory tools should beusedPadded
without damagingitssurface, anda 0.145-in.
Pliers, 207-579, are used to grip the trip rod
(3.7
mm) Gauge, 171-818, is usedto assure the
thepiston.
proper clearance between the poppets and seat of
Disassembly
1. Flushthepump.Followthe PressureRelief
Procedureon page
8 before proceeding.
2. Disconnect the hoses, remove the pump from
its
mounting, and clamp the air motor base (28) in a
vise horizontally
by closingthevice jaws on the
flange.
3. Use a strap wrench on the displacement pump
cylinder (110) to screwitout of the air motor base
(28).SeeFig.3.
4. Remove the pistonhalve seat (109) from the rod
(29) with wrenches
or with the vice and awrench.
5. Removethepistonball(103),u-cuppacking
(107t),and piston washer (113).
6. Remove the air motor base from the vice, and
place the piston rod (29) flats in the vice with the
air motor up.
7. Loosen the
lift ring (24). Pull the lift ringup, grip
the trip rod(31) with the padded pliers, and screw
the
lift ring off of the rod.
A CAUTION I
Do not damage the plated surface of the trip rod
(31). Damaging the surfaceof the trip rod can
result
in erratic air motor operation. Use the
special padded pliers, 207-579, to grasp the rod.
8. Remove the six screws (3) holding the cylinder
(30) to
the base (28). Carefullypullthe cylinder
straight up
off of the piston (53).
I A CAUTION I
To avoid damaging the cylinder wall, lift the cylinder
straight up
off of the piston. Never tilt thecylinder
as it isbeing removed.
9. Remove the pistonbase from the vise, and setit
upright on the workbench.
31
19*
53
20*
3
28
103
113
107t
109
110
30
29
lot
flange
W692
Fig. 3
t Included inRepair Kit 237-602.
10 308-485