Graco Series A Operation manual

308–674
Rev. C
Supersedes Rev. B
06169
INSTRUCTIONS-PARTS LIST
INSTRUCTIONS
This manual contains important
warnings and information.
READ AND KEEP FOR REFERENCE.
Viscount I Hydraulic Motor and
Displacement Pump
Model 238–349, Series A
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
COPYRIGHT 1996, GRACO INC.
Graco Inc. is registered to I.S. EN ISO 9001

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Table of Contents
Warnings 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disconnecting the Hydraulic Motor 8. . . . . . . . . . . .
Reconnecting the Hydraulic Motor 8. . . . . . . . . . . .
Disconnecting the Displacement Pump 10. . . . . . .
Reconnecting the Displacement Pump 11. . . . . . .
Parts 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Motor and Pump Assembly 13. . . . . . . . . . . . . . . . .
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 Symbol
CAUTION
This symbol alerts you to the possibility of damage to
or destruction of equipment if you do not follow the
instructions.
WARNING
EQUIPMENT MISUSE HAZARD
Equipment misuse can cause the equipment to rupture or malfunction and result in serious injury .
D
This equipment is for professional use only .
D
Read all instruction manuals, tags, and labels before operating the equipment.
D Use the equipment only for its intended purpose. If you are not sure, call your Graco distributor .
D
Do not alter or modify this equipment.
D Check equipment daily . Repair or replace worn or damaged parts immediately .
D Do not exceed the maximum working pressure stated on the equipment or in the T echnical Data
for your equipment. Do not exceed the maximum working pressure of the lowest rated component
in your system.
D Use 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.
D Handle hoses carefully . Do not pull on hoses to move equipment.
D Route hoses away from traffic areas, sharp edges, moving parts, and hot surfaces. Do not expose
Graco hoses to temperatures above 66 _ C (150 _ F) or below –40 _ C (–40 _F).
DW
ear hearing protection when operating this equipment.
D Do not move or lift pressurized equipment.
D Comply with all applicable local, state, and national fire, electrical, and safety regulations.

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WARNING
INJECTION HAZARD
Spray from the gun, 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 .

Fluid injected into the skin is a serious injury . The injury may look like just a cut, but it is a serious
injury . Get immediate medical attention.
 Do not point the gun at anyone or at any part of the body .
 Do not put your hand or fingers over the spray tip.
 Do not stop or deflect 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 gun when spraying.
 Check the gun dif fuser operation weekly . Refer to the gun manual.
 Be sure the gun trigger safety operates before spraying.
 Lock the gun trigger safety when you stop spraying.
 Follow the Pressure Relief Procedure on page 7 if the spray tip clogs and before cleaning,
checking or servicing the equipment.
T ighten all fluid connections before operating the equipment.
 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.
 Fluid hoses must have spring guards on both ends, to help protect them from rupture caused by
kinks or bends near the couplings.
MOVING P ARTS HAZARD
Moving parts can pinch or amputate your fingers.
 Keep clear of all moving parts when starting or operating the pump.
 Before checking or servicing the equipment, follow the Pressure Relief Procedure on page 7 to
prevent the equipment from starting unexpectedly .

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WARNING
FIRE AND EXPLOSION HAZARD
Improper grounding, poor ventilation, open flames or sparks can cause a hazardous condition and re -
sult in a fire or explosion and serious injury .
 Ground the equipment and the object being sprayed. Refer to Grounding on page 5.
 If 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.
 Provide fresh air ventilation to avoid the buildup of flammable fumes from solvents or the fluid
being sprayed.
 Keep the spray area free of debris, including solvent, rags, and gasoline.
 Before operating this equipment, electrically disconnect all equipment in the spray area.
 Before operating this equipment, extinguish all open flames or pilot lights in the spray area.
 Do not smoke in the spray area.
 Do not turn on or of f any light switch in the spray area while spraying or while operating if fumes
are present.
 Do 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.
 Know the specific hazards of the fluid you are using.
 Store hazardous fluid in an approved container . Dispose of hazardous fluid according to all local,
state and national guidelines.
 Always wear protective eyewear , gloves, clothing and respirator as recommended by the fluid and
solvent manufacturer .

5308-674
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 .
Grounding
WARNING
FIRE AND EXPLOSION HAZARD
Before operating the pump, ground the
system as explained below . Also read
the section FIRE OR EXPLOSION HAZ -
ARD
on page 4.
1. Pump: use a system ground wire and clamp. See
manual 308–61 1.
2.
Hydraulic, and fluid hoses: use only electrically
conductive hoses.
3. Hydraulic power supply: follow manufacturer ’s
recommendations.
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.
T o 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.

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Installation
General
1. Connect the hydraulic motor (101) and the dis -
placement pump (102) as explained on page 8.
See Fig. 1.
CAUTION
Keep the hydraulic system clean
T o reduce the risk of damaging the hydraulic power
supply and motor , blow out all hydraulic lines with air ,
flush thoroughly with solvent, and then blow out with
air again before connecting the lines to the hydraulic
motor.
Always plug the hydraulic inlets, outlets and lines
when disconnecting them for any reason to avoid
introducing dirt and other contaminants into the
system.
Carefully follow the manufacturer ’ s recommendations
on reservoir and filter cleaning, and periodic changes
of hydraulic fluid. The maximum water content of the
hydraulic oil is 1 percent.
Fig. 1
06169
101
102

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Operation
Startup
Before each use, check the hydraulic fluid level and
add fluid as necessary to fill the lines.
WARNING
FIRE HAZARD
If hydraulic oil becomes too hot, it can
reach its flash point and cause a fire.
Operating at too high an oil temperature
can also cause faster motor seal wear and leak -
age. The recommended hydraulic oil operating
temperature is 80–1 15_F (27–45_ C). If the oil
temperature approaches 130 _F (54_ C), shut of f the
motor and check the hydraulic oil supply cooling
system, filters, etc. Clean or repair as needed.
Always use Graco-approved Hydraulic Oil or
equivalent. Do not substitute a lower grade oil or
one with a lower flash point.
The equivalent is a premium, ISO grade 46
petroleum-based hydraulic oil containing rust and
oxidation inhibitors and anti-wear agents. Before
using any other type of oil in this equipment,
contact Graco T echnical Assistance,
1–800–543–0339. Unauthorized use of lesser
grade oil or substitutes will void the warranty .
Shutdown & Care
Follow the Pressure Relief Procedure W arning
below.
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 . T o reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure
whenever you:
D are instructed to relieve the pressure,
D stop spraying,
D check or service any of the system equipment,
D or install or clean the spray tip.
1. Set hydraulic pump lever in by-pass position.
2. Place an empty pail under the drain valves to
catch drainage from the drain valves.
3. Open all paint drain valves.
4. Place an empty pail under guns to catch drainage
from the guns.
5. Actuate guns to relieve pressure.
6. Shut of f engine.
7. Leave the drain valve(s) open until you are ready
to spray again.
If you suspect that the spray gun or hose is completely
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 valve or hose.

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Service
Disconnecting the Hydraulic Motor
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 7.
1. Relieve the pressure .
2.
Disconnect the hydraulic hoses and plug all hy -
draulic connections and hoses.
CAUTION
Keep the hydraulic system clean
Always plug the hydraulic inlets, outlets and lines
when disconnecting them for any reason to avoid
introducing dirt and other contaminants into the
system.
3. Remove the cotter pin (5), and unscrew the cou -
pler (6) from the hydraulic motor displacement rod
(104). Remove the o–ring (7) from the coupler .
See Fig. 1.
4. With the unit upright, remove the three bolts (1)
and the tie rods (2) holding the hydraulic motor
(101) to the pump (102). See Fig. 1.
5. Clean and inspect all parts. Replace parts as
necessary. T o service the hydraulic motor (101),
refer to manual 308–618
Reconnecting the Hydraulic Motor
1. WIth the unit upright, insert the three bolts (1)
through the hydraulic motor tie plate (103), the tie
rods (2), and into the pump tie plate (3). T orque
the bolts to 20–30 ft-lb (27–40 N m).
2.
Lubricate, and place the o–ring (7) on the coupler
(6). Insert the coupler into the hydraulic motor
displacement rod (104), making sure that the holes
in both pieces are aligned. T orque the coupler to
75–80 ft-lb (101–108 N  m). Insert the cotter pin
(5). See Fig. 1.
3. Unplug all hydraulic connections and hoses.
Reconnect the hydraulic hoses.
06170
Fig. 2
1
101
103
104
5
6
3
102
2
7

9308-674
Notes

10 308-674
Service
Disconnecting the Displacement Pump
CAUTION
When servicing the left and center displacement
pumps (as viewed from the rear of the system), the
packings in both units must be replaced at the same
time, or uneven performance will result.
1. Flush the entire system.
NOTE: Any residual paint may clog the system.
WARNING
T o reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 7.
2. Relieve the pressure.
3. Disconnect the filter hose and the inlet hose.
CAUTION
Be sure to support the displacement pump while it is
being disconnected, to prevent it from falling and
causing injury or property damage. Do this by se -
curely bracing the pump, or by having one person
hold it while another disconnects it.
4. Using an adjustable wrench, remove the three
bolts (1) and the tie rods (2). Slide the
pump (102) down as far as possible.
5. With two adjustable wrenches, use one to hold the
coupler (6) to prevent it from turning, and the other
to disconnect the displacement rod (105). Carefully
remove the pump from the hydraulic
motor (101).
6.
Unscrew the lower tie plate (3), and retaining nut
(4) from the displacement pump.
7. Refer to manual 308–650 for displacement pump
service.
Fig. 3
1
2
102
101
103
6
3
4
105
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