Graco 237 A Series Operation manual

INSTRUCTIONS–P

ARTS LIST

308–462

Rev.

Supersedes A

30:1 PRESIDENT, CARBON STEEL, CART MOUNTED

Heated

ir-Assiste

d A

irles

s P

ackage

See the Data Sheet, 305–665, for application information

3000 psi (210 bar) Maximum System Working Pressure

100 psi (6.9 bar) Maximum Air Inlet Pressure

Model 237–423, Series A

This

complete package includes a pump,

an air-assisted airless–spray gun with size a 41

1 spray tip,

a portable cart, 25 ft. (7.6 m) air and fluid hoses,

air and fluid controls, and a fluid feed.

IMPORTANT

This manual provides the basic safety

, installation and

operation information for the spray system. For your

safety

, also read the component manuals supplied with

this system before operating it.

GRACO INC. P.O. BOX 1441

MINNEAPOLIS, MN

55440–1441

COPYRIGHT

1994, GRACO INC.

This manual contains important

warnings and information.

READ AND RETAIN FOR REFERENCE

04129



Table

of Contents

Symbols 2.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warnings 3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Setup 5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System

Component Information

. . . . . . . . . . . . . . . . .

Operation 9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts 14

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Technical

Data

16.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warranty 16

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Graco

Phone Numbers

16.

. . . . . . . . . . . . . . . . . . . . . . . .

Symbols

Warning Symbol

WARNING

This

symbol alerts you to the possibility of serious

injury or death if you do not follow the instructions.

Caution SymbolCAUTION

This

symbol alerts you to the possibility of damage to

or destruction of equipment if you do not follow the

corresponding instructions.





SKIN 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. Splashing fluid in the eyes or on the skin

can also cause can also cause serious injury

Fluid injected into the skin is a serious injury

. The injury might look like just a cut, but it is a ser

iuos injury

. Get immediate medical attention.

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

Do not put hand or fingers over the spray tip.

Do not stop or deflect fluid leaks with your hand, body

, glove or rag.

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

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

Check the gun dif

fuser operation weekly

. Refer to the gun manual.

Be sure the gun trigger safety operates before spraying the gun.

Lock the gun trigger safety when you stop spraying.

Follow the

Pressure relief procedure

on page 9 if the spray tip clogs and before cleaning,

checking or servicing the equipment.

ighten all fluid connections before each use.

Check the hoses, tubes and couplings daily

. Replace worn or damaged parts immediately

. Per

manently coupled hoses cannot be repaired.

Handle and route hoses and tubes carefully. Keep hoses and tubes away from moving parts and

hot surfaces. Do not use the hoses to pull equipment. Do not expose Graco hoses to tempera

tures above 180

_F (82_

C) or below –40

_F (–40_C).

TOXIC FLUID HAZARD

Improper

handling of hazardous fluids or inhaling toxic fumes can cause extremely serious injury

even death, due to splashing in the eyes, ingestion, or bodily contamination.

Know the specific hazards of the fluid you are using.

Store hazardous fluid in an approved container

. Dispose hazardous fluid according to all local,

state and national guidelines.

ear appropriate clothing, gloves, eyewear and respirator

FLUID HEATER HAZARD

DThe

heater is not appropriate for use in certain hazardous locations when soft wired as of

fered in

this package. The heater is CSA certified and FM Approved as explosion proof for Class I, Divi

sion 1, Group D, Hazardous Locations, T

emp Code (identification number) T3. Read the heater

manual, 307–805, for additional information.

Do not touch the heater during operation, it is very hot.

WARNINGWARNING



FIRE AND EXPLOSION HAZARD

Improper

grounding, poor air ventilation, open flames or sparks can cause a hazardous condition

and result in a fire or explosion and serious injury

Ground the equipment and the object being sprayed. See

Ground the system

on 6.

If there is any static sparking while using the equipment,

stop spraying immediately

. Identify

and correct the problem.

Provide fresh air ventilation to avoid the buildup of flammable vapors from solvent or the fluid be

ing sprayed.

Do not smoke in the spray area.

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

Do not turn on or of

f any light switch in the spray area.

Electrically disconnect all equipment in the spray area.

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

Do not operate a gasoline engine in the spray area.

EQUIPMENT MISUSE HAZARD

Equipment

misuse can cause the equipment to rupture, malfunction or start unexpectedly and result

in serious injury

This equipment is for professional use only

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

Use the equipment only for its intended purpose. If you are in doubt about this, call Graco T

echni-

cal Assistance at 1–800–543–0339.

Do not alter or modify this equipment. Use only genuine Graco parts and accessories.

Check equipment daily

. Repair or replace worn or damaged parts immediately

Do not exceed the

2760 psi (190 bar) maximum working pressure at 120 psi (8.3 bar) maxi

mum incoming air pressure

of the pump, or the maximum working pressure of any accessory

used with it.

Do not move or lift pressurized equipment.

DUse

fluids or solvents which are compatible with equipment

wetted parts. Refer to the

echnical Data

section

of all equipment manuals. Read the fluid and solvent manufacturer

’

s warnings.

Fluid hoses must have spring guards on both ends to protect it from rupture caused by kinks or

bends at or close to the couplings.

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

MOVING

ARTS HAZARD

Moving

parts, such as the air motor piston located behind the air motor plates, which can pinch or

amputate fingers.

Never operate the equipment with the air motor plates removed.

Keep clear of any moving parts when starting or operating the equipment.

WARNINGWARNING





Setup

I. Prepare the operator.

All

persons who operate the system should be trained

in the safe, efficient operation of all system compo

nents as well as the proper handling of the chemical

coating. At a minimum, all operators should

thoroughly read the safety

, installation and operation

sections of this manual and the component manuals.

II. Prepare the site.

1. Use

a minimum recommended 5 HP (3.7 kW)

air

compressor for ef

ficient operation.

Clear obstacles and debris that could hinder the

operator’

s movement.

Bring an air line from your compressed air supply

to the pump location. Be sure the air is dry and

filtered. Install a bleed–type master air valve (A)

upstream from the pump. Another master air valve

(32) is supplied with the package. When the

bleed–type master air valve is closed and the

pump air regulator (31a) is opened, the valve

relieves all air pressure to the system.

Have a grounded waste pail available to use when

draining the fluid filter

5. V

entilate the spray booth.

WARNING

o prevent hazardous concentrations of

toxic and/or flammable vapors, spray

only in a properly ventilated spray

booth.

Never operate the spray gun

unless ventilation fans are operating.

Check and follow all of the national, state and local

codes

regarding air exhaust velocity requirements.

KEY

Components

you must supply:

Bleed-type master air valve

Required for pump, order

part no. 107–142, 1/4” npt(f)

Air filter

. Order part no.

106–149, 1/2 npt(f)

Air supply line

Grounded 5 gallon metal pail

Air line moisture trap

Components supplied with package:

30:1 President pump

Fluid heater

Back pressure regulator

Fluid filter (not visible)

Filter drain valve (not visible)

31a

Pump air regulator

31b

Gun air regulator

Bleed–type air valve

Air-assisted airless spray gun

64a

Gun fluid hose

64b

Gun air hose

Pump ground wire

Fig.



64b

31b

31a



Setup

III. Unpack the system.

1. In

addition to the assembled unit, these compo

nents are packed separately: suction assembly

hose set, gun. In Fig. 1 items identified with a

number are supplied with the system. Items identi

fied with a letter are supplied by you.

These are the manuals you should receive:

306–981

30:1 President pump

308–176

Air-Assisted Airless spray gun

307–273

Fluid filter

307–805

Fluid heater

306–860

Back pressure regulator

308–167

Air regulator

306–861

Ball valve

308–136 Cart

IV. Connect the hose set and gun to the

system. See

Fig. 1 and 2.

Connect the air hose (64b

) between the gun air

regulator (31b) and the air inlet of the spray gun

(55). These are 1/4–18 swivel fittings.

Connect one blue fluid hose (64a

) to the fluid filter

(28) outlet. Connect the other blue fluid hose to the

back pressure regulator (3) outlet. These are

1/4–18 swivel fittings.

Connect the whip hose (19) to the fluid inlet of

the spray gun (55). These are 1/4–18 swivel fit

tings.

4. V

erify that all fittings throughout the system are

tightened securely

Use a tie strap to secure the insulated hose to the

leg of the cart. This provides strain relief so that

tugs on the heavy hoses don’t damage the hose

connections.

Fig. 2

gun air regulator (31b) outlet

Ref

64a

fluid filter (28) outlet

o back pressure regulator (3) outlet

64a

64b













V. Ground the system.

WARNING

reduce the risk of static sparking, ground the

pump and all other equipment used or located in

the spray area. Check your local electrical code for

detailed grounding instructions for your area and

type of equipment.

Ground all of this equipment.

Also read .

FIRE OR EXPLOSION HAZARD

page 4

Pump

: one end of the ground wire (66) is already

connected to the air motor grounding lug. Connect

the clamp end of the ground wire to a true earth

ground. Connect the clamp end of the ground wire

to a true earth ground.

Air and fluid hoses

: use only grounded hoses with

a maximum of 500 ft. (150 m) combined hose

length to ensure grounding continuity

Heater:

by plugging into a properly grounded elec

trical outlet. If you use an extension cord, be sure

it is a 3-wire grounded cord which is properly sized

for the heater

Air compressor

: according to manufacturer

’

recommendations.

Spray gun:

grounding is obtained through connec

tion to properly grounded air and fluid hoses and

pump.

Object being sprayed:

according to local code.

Fluid supply container:

according to local code.

All solvent pails used when flushing

, according to

local code. Use only metal pails, which are con

ductive. Do not place the pail on a non-conductive

surface, such as paper or cardboard, which inter

rupts the grounding continuity





System Component Information

I. How to use the air–assisted airless

spray gun.

With

an air-assisted airless spray gun, the spray tip

shapes the fluid into a fan pattern. Air from the air cap

further atomizes the fluid and completes the atomiza

tion of the paint tails into the pattern to produce a more

uniform pattern.

The

spray gun has a built-in lead and lag operation. When

triggered,

the gun emits air before the fluid is discharged.

When

the trigger is released, the fluid stops before the

air

flow

stops. This helps assure

the spray is atomized and

prevents fluid buildup on the air cap.

NOTE: The gun air and fluid inlets have 1/4–18 npsm

(R1/4–19) compound male threads that are compatible

with

NPSM and BSP female swivel connectors.

Use the fan pattern valve (E) can be used to

reduce the pattern by about 25% of the total pat

tern width. As the valve is opened, the pattern will

reduce slightly

. The tip used designates the total

width of the spray pattern.

2. T

o unlock the gun trigger safety, turn the safety so

it is parallel with the trigger

. T

o lock the gun trigger

safety

, turn the safety to a right angle with the trig

ger

. See Fig. 3.

Fig. 3

UNLOCKED

gun trigger safety

LOCKED gun trigger safety

0795A

II. How to change the spray pattern

direction.

1. Relieve

the air and fluid pressure.

Install a spray tip in the gun. Rotate the air cap

(the spray tip rotates with it) to determine the

direction of the spray pattern. See Fig. 4.

Fig. 4

ertical Spray Pattern

Horizontal Spray Pattern

0791



System Component Information

III. Fluid heater.

See

Fig. 5.

The heater (3) used in this system is a high mass

heater

. Always circulate the fluid when the heater is

operating to prevent overheating and damaging the

fluid. Do not use catalyzed material in this heater

IV. How to use the 3–way valve.

See

Fig. 5.

Heated systems require that the fluid circulate

constantly when the heater is turned on. The 3-way

valve (7) supplied with this system allows you to drain

or circulate the fluid. The words

Drain

and

Circulate

are marked on the valve.

In the

Drain

position and with the gun untriggered,

the fluid returns from the gun, to the back pressure

regulator (3), to the hose (19) and to the 3–way

valve (7) which directs the fluid out the drain hose

(8). This position is used when flushing the system

and when relieving system pressure.

In the

Circulate

position, with the gun untriggered,

fluid returns from the gun, to the back pressure

regulator (3), to the hose (19) and to the 3–way

valve (7) which directs the fluid back into the pump

intake. This position is used during normal opera

tion and it helps keeps the fluid at a constant

temperature.

Fig. 5

V. How to adjust the air and

back pressure regulators. See

Fig. 6.

This system has two air regulators. As you look at the

system, the regulator (31a) on the left of the pump

regulates air to the gun and the regulator (31b) on the

right regulates air to the pump.

Always open air regulators slowly to prevent surg

ing during startup.

2. T

o open the regulator

, which allows air to flow

, turn

the T–handle IN (clockwise). T

urn the T–handle

OUT (counterclockwise) to close off the air flow

Be sure the jam nut under the T–handle does not

interfere with your adjustments. T

ighten the jam

nut to lock in the setting, if desired.

The back pressure regulator (3), located on the

fluid return side of the circulating system, acts as a

flow control. Use it to balance the pressure of the

circulating fluid so that the pump sucks in a suf

fi-

cient volume of fluid without running too fast or too

slow. T

urn the regulator IN (clockwise) to restrict

fluid and slow down the pump. T

urn the regulator

OUT (counterclockwise) to allow more flow which

speeds up the pump. See Fig. 6.

4. T

o open the back pressure regulator

, which allows

fluid to flow

, turn the knob IN (clockwise).

Adjust the back pressure regulator only when the

gun is triggered and fluid is flowing through the

regulator for an accurate setting.

Fig. 6

CCW

31b

31a







Operation

I. Pressure relief procedure

WARNING

reduce the risk of serious injury

, including

splashing fluid or solvent in the eyes or on the skin,

always follow the

procedure below when you stop

spraying or shut of

f the pump, check or service any

part of the system, or install, clean or change spray

tips.

Engage the gun trigger safety

2. T

urn off the heater (turn to

0).

3. T

urn the 3-way valve (7) to

Drain.

Close the bleed-type master air valve (A,14).

Close the air regulators (31a,31b).

Disengage the gun trigger safety

Hold the gun firmly to a grounded metal pail.

rigger the gun to relieve pressure.

Engage the gun trigger safety

Open the drain valve (29), having a container

ready to catch the drainage.

If you suspect that the spray tip or hose is completely

clogged or that pressure has not been fully relieved,

very slow loosen the tip guard retaining nut or hose

end coupling and relieve pressure gradually

. Clean the

tip or hose obstruction.

II. Flush the pump before the first use.

Flush

with a solvent compatible to your fluid. Consult

the fluid manufacturer

’

s literature for recommenda

tions. See

Flushing

on page 12.

III. Prime the system.

See

Fig. 7.

Remove the air cap and spray tip from the gun.

Close the filter drain valve (29).

Put the suction tube into the fluid supply container

Hook the drain hose (8) on the waste pail.

5. T

urn the 3-way valve (7) to the

Drain

position.

6. T

urn the back pressure regulator (3) all the way

out (counterclockwise)

Make sure the air regulators (31a,31b) are closed.

Open the master air valves (A,32).

Fig. 7 

31b

31a

KEY

A Bleed-type

master air valve)

Air supply line

Fluid heater

Back pressure regulator

3–way valve

Fluid filter (not visible)

Filter drain valve

(not visible)

31a

Pump air regulator

31b

Gun air regulator

Bleed–type air valve

10 308-462

Operation

NOTE:

In the next steps, the pump will cycle quickly

until air is purged.

Slowly turn on the pump air regulator (31b) until

the pump cycles slowly

. When fluid flows from the

drain hose, turn the 3-way valve to

Circulate.

10.

Hold the gun firmly to the grounded metal waste

pail. T

rigger the gun while adjusting pressure at

the pump air regulator (31b) just enough to purge

the air and storage solvent out of the system.

When new fluid comes from the gun, release the

trigger

. Engage the gun trigger safety

11. T

urn IN the back pressure regulator (3) to raise the

system pressure until the pump stops.

12.

Raise the air pressure to the pump to 35 psi (2.4

bar). Adjust the back pressure valve to set the

pump cycle rate at 1 stroke every 10 seconds.

13. T

urn the heater dial to

. When adjusting the

heater

, always allow the fluid to circulate and stabi

lize (about 10 minutes) before checking the tem

perature.

CAUTION

Be sure the fluid is circulating whenever the heater

is on to reduce the risk of damage to the fluid or

the heater

14.

Use the fluid manufacturer

’

s recommendations for

temperature and adjust the heater accordingly

. If

unknown, set the temperature to 1

10_F (43_

C) at

the outlet thermometer

. Do not proceed until the

temperature has stabilized. Do not allow the fluid

to exceed 140

_F (60_

C) unless your fluid

manufacturer recommends higher temperatures.

15.

Spray fluid into a waste pail for about 10 seconds

to bring heated material to the gun.

16.

Hook the drain hose (8) on the fluid supply pail.

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