Graco 308720C ELECTRIC, 120 VAC 455 st Airless Paint Sprayer Owner's Manual

INSTRUCTIONS-PARTS LIST

This manual contains important warnings and information.

READ AND KEEP FOR REFERENCE.

308–720

First choice when quality counts.

Rev. C

Supercedes Rev. B

INSTRUCTIONS

ELECTRIC, 120 VAC

455

st

Airless Paint Sprayer

3000 psi (210 bar, 21 MPa) Maximum Working Pressure

Model 231–581, Series A

Standard mount; complete sprayer with hose, gun,

RAC IV DripLess Tip Guard and SwitchTip


Low profile cart; complete sprayer with hose, gun,

RAC IV DripLess Tip Guard and SwitchTip

Model 231–581

Related Manuals

Displacement Pump

Fluid Filter

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

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

Spray Gun

Spray Tip

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

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

308–190

308–249

308–645

308–644

GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441

COPYRIGHT 1997, GRACO INC.

Graco Inc. is registered to I.S. EN ISO 9001

06973

Table of Contents

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Component Identification and Function . . . . . . . . . . . .

Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shutdown and Care

Flushing

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

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

9

11

12

6

7

2

5

Troubleshooting

Motor Test

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

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

General Repair Information

Motor Brush

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

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

Displacement Pump Repair

Motor

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

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

Motor Start Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13

17

18

19

21

22

23

Symbols

Power Supply Cord

ON/OFF Switch

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

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

Drive Housing, Connecting Rod, Crankshaft

Pressure Control

. . . . . .

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

Pressure Transducer . . . . . . . . . . . . . . . . . . . . . . . . . .

Suction Hose

Drain Valve

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

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Model 231–581 Sprayer Parts Drawing

Model 231–581 Sprayer Parts List

. . . . . . . . . .

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

Model 231–583 Sprayer Parts Drawing

Model 231–583 Sprayer Parts List

. . . . . . . . . .

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

Technical Data

Dimensions

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

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Graco Warranty and Disclaimers . . . . . . . . . . . . . . . .

30

31

32

33

34

34

36

23

23

24

26

27

27

28

Warning Symbol

WARNING his 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

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.

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.

Electrically disconnect all equipment in the spray area.

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

Do not smoke in the spray area.

Do not turn on or off any light switch in the spray area while operating or if fumes are present.

Do not operate a gasoline engine in the spray area.

Use only with a grounded outlet that matches the grounded plug of this equipment.

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 diffuser 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 9 if the spray tip clogs and before cleaning, checking or servicing the equipment.

Tighten 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.

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.

MOVING PARTS HAZARD

Moving parts can pinch or amputate your fingers.

Keep clear of all moving parts when starting or operating the pump.

Before servicing the equipment, follow the Pressure Relief Procedure on page 9 to prevent the equipment from starting unexpectedly.

INSTRUCTIONS

WARNING

EQUIPMENT MISUSE HAZARD

Equipment misuse can cause the equipment to rupture or malfunction 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 not sure, call your distributor.

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

Check equipment daily. Repair or replace worn or damaged parts immediately.

Do not exceed the maximum working pressure of the lowest rated system component. Refer to the

Technical Data on page 34 for the maximum working pressure of this equipment.

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.

Do not use 1,1,1–trichloroethane, methylene chloride, other halogenated hydrocarbon solvents or fluids containing such solvents in pressurized aluminum equipment. Such use could result in a chemical reaction, with the possibility of explosion.

Do not use hoses to pull 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 pressurized equipment.

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

NOTE: This is an example of the DANGER label on your sprayer. This label is available in other languages, free of charge. See page 34 to order.

FIRE AND

EXPLOSION HAZARD

SKIN INJECTION

HAZARD

Spray painting, flushing or cleaning equipment with flammable liquids in confined areas can result in fire or explosion.

Use outdoors or in extremely well ventilated areas. Ground equipment, hoses, containers and objects being sprayed.

Avoid all ignition sources such as static electricity from plastic drop cloths, open flames such as pilot lights, hot objects such as cigarettes, arcs from connecting or disconnecting power cords or turning light switches on and off.

Failure to follow this warning can result in death or serious injury.

Liquids can be injected into the body by high pressure airless spray or leaks – especially hose leaks.

Keep body clear of the nozzle. Never stop leaks with any part of the body. Drain all pressure before removing parts.Avoid accidental triggering of gun by always setting safety latch when not spraying.

Never spray without a tip guard.

In case of accidental skin injection, seek immediate

“Surgical Treatment”.

Failure to follow this warning can result in amputation or serious injury.

READ AND UNDERSTAND ALL LABELS AND INSTRUCTION MANUALS BEFORE USE

H

Component Identification and Function

N

C

B

A

K E

05963

G

Fig. 1

A Motor

B Drive Assembly

C Pressure Adjusting Knob

D ON/OFF Switch

E Fluid Outlet

F Displacement Pump

G 50 ft (15 m) Main Hose

H RAC IV Tip Guard

J Contractor FTx Gun

K RAC IV Switch Tip

L Pressure Drain Valve

M Pressure Control

N Spray Gun Safety Latch

L

M

D

J

F

Model 231–581 Shown

06973

DC motor, 120 Vac, 15A, 1 phase

Transfers power from DC motor to the displacement pump

Controls fluid outlet pressure

Power switch that controls 120 Vac power to sprayer

Hose and spray gun is connected here

Pressurizes fluid to be sprayed through spray gun

1/4 in. ID, grounded, nylon hose with spring guards on both ends

Reverse-A-Clean (RAC) tip guard reduces the risk of fluid injection injury

High pressure spray gun with gun safety latch

RAC switch tip atomizes fluid and removes clogs from spray tip without removing tip from spray gun

Relieves fluid pressure when open

Controls motor to maintain fluid pressure. Works with pressure adjusting knob.

Inhibits accidental triggering of spray gun

WARNING

If you supply your own hoses and spray gun, be sure the hoses are electrically conductive, that the gun has a tip guard, and that each part is rated for at least 3000 psi (210 bar, 21 MPa) Working Pres sure. This is to reduce the risk of serious injury caused by static sparking, fluid injection or overpressurization and rupture of the hose or gun.

Setup

2.

Fill the wet–cup (102). Pry off the wet-cup seal.

Fill the cup 1/3 full with Graco Throat Seal Liquid

(TSL), supplied. Install the wet-cup seal.

3.

Plug in the sprayer. Be sure the ON/OFF switch

(52) is OFF. Plug the cord into a 15A grounded outlet at least 20 feet away from the spray area. A

12 AWG 150 ft (45 m) grounded extension cord may be used.

CAUTION

To avoid damaging the pressure control, which may result in poor equipment performance and component damage, follow these precautions:

1. Always use a nylon spray hose at least 50 ft. (15 m) long.

WARNING


Proper electrical grounding is essential to reduce the risk of fire or explosion which can result in serious injury and property damage. Also read FIRE OR

EXPLOSION HAZARD on page 2

2. Never use a wire braid hose as it is too rigid to act as a pulsation dampener.

4.

Flush the pump to remove the lightweight oil which was left in to protect pump parts after factory testing. See page 12.

3. Never install any shutoff device between the filter and the hose.

See Fig. 2.

1.

Connect the hose (74) and gun (67) and screw it onto the outlet nipple (28). Don’t use thread sealant, and don’t install the spray tip yet!

5.

Prepare the paint according to the manufacturer’s recommendations. Remove any paint skin. Strain the paint through a fine nylon mesh bag (available at most paint dealers) to remove particles that could clog the spray tip. This is an important step toward trouble-free paint spraying.

1

2

3

4

5

1/4 npsm(m) fluid outlet

Do not install any shutoff device here

Rotate clockwise to increase pressure

Shown in closed or spray position

Fill 1/3 full with TSL

74

2 1 28

3 64

33

32

52

4

102 5

67

Model 231–581 Shown

06973

Fig. 2

Setup

Grounding

Grounded

Outlets

WARNING

Improper installation or alteration of the grounding plug will result in a risk of electric shock, fire or explosion that could cause serious injury or death.

Fig. 3

Grounding Prong

2. Do not alter the ground prong or use an adapter.

1. This equipment requires a 120 Vac, 60 Hz, 15A circuit with a grounding receptacle. See Fig. 3.

3. A 12 AWG gauge, 50 ft extension cord may be used with this equipment.

Operation

How to use the gun trigger safety

When engaged, the gun safety latch prevents the gun from accidental triggering. See Fig. 4.

1

2

Open or drain, position

Closed, or spray position

WARNING


If the gun still sprays when the gun trigger safety is locked, repair the gun.

See manual 308–645, supplied.

1

2

Gun safety latch shown engaged

Gun safety latch shown disengaged

Fig. 5

1

2

02825A

1

How to use the pressure control.

The pressure control controls the motor operation so the sprayer maintains constant fluid pressure at the pump outlet. Turn the pressure control knob fully counterclockwise to obtain the minimum setting. Turn the knob clockwise to increase pressure. See Fig. 6.

2

05964

Fig. 4

How to use the pressure drain valve.

Use the pressure drain valve to relieve fluid pressure from the pump and to help prime the pump. If the valve senses an over pressure condition, it opens automatically to relieve fluid pressure. If this happens, stop spraying immediately, shut off and unplug the sprayer.

Determine the cause of the problem and correct it before operating the sprayer again. Refer also to the

Troubleshooting, page 13. See Fig. 5.

Fig. 6

02824A

Operation

How to use the RAC IV tip guard.

WARNING


To reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the Pressure Relief

Procedure on page 9.

The tip guard alerts you to the risk and helps prevent placing any part of the body close to the spray tip. The tip guard also adjusts the vertical or horizontal spray pattern. See Fig. 9. The tip guard holds a reversing spray tip. The tip is in the spraying position when the tip handle points forward. See Fig. 7.

Clean the front of the tip frequently during the day’s operation. First, follow the Pressure Relief Procedure on page 9.

1 2

1

Tip handle shown in spraying position.

2 Turn handle 180 ,

trigger gun to clear clog

Fig. 7

04647

How to remove a tip clog.

1. Release the gun trigger. Lock the safety latch.

Rotate the RAC IV tip handle 180 . See Fig. 7.

2. Unlock the safety latch. Trigger the gun into a pail or onto the ground to remove the clog.

3. Lock the safety latch. Rotate the tip handle to the spraying position.

4. If the tip is still clogged, lock the safety latch, shut off and unplug the sprayer, and open the pressure drain valve to relieve pressure. Clean the spray tip as shown in manual 308–644, supplied.

WARNING


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: are instructed to relieve the pressure, stop spraying, check or service any of the system equipment, or install or clean the spray tip.

Startup

NOTE: Refer to Fig. 2 and the other figures referenced in the text as you start the sprayer.

1.

Open the pressure drain valve (42). See Fig. 8.

2.

Don’t install the spray tip until the pump is primed!

3.

Put the suction hose (32) into the paint. If you are pumping from a pail, push the drain hose (33) down below the top of the pail to avoid splashing paint when the drain valve is opened.

Pressure Relief Procedure

1. Engage the gun safety latch.

2. Turn the ON/OFF switch to OFF.

3. Unplug the power supply cord.

4. Disengage the gun safety latch. Hold a metal part of the gun firmly to a grounded metal pail. Trigger the gun to relieve pressure.


6. Open the pressure drain valve. Leave the pressure 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 to relieve pressure gradually, then loosen completely.

Now clear the tip or hose obstruction.

Startup Procedure

Use this procedure each time you start the sprayer to help ensure the sprayer is ready to operate and that you start it safely.

NOTE: If this is a first-time startup, flush the sprayer.

See page 12.

1

Fig. 8

Open or drain, position

42 1

01021A

4.

Turn the pressure knob (64) to the minimum setting.

5.

Disengage the gun trigger safety. See Fig. 4, page 7.

CAUTION

Do not run the sprayer dry for more than 30 seconds to avoid damaging the pump packings.

6.

To prime the pump, turn the sprayer switch (52) on.

Slowly increase the pressure until the sprayer starts. When fluid comes from the pressure drain valve, close the valve.

WARNING


To reduce the risk of static sparking and splashing when priming or flushing the system, hold a metal part of the gun firmly to the side of a grounded metal pail before triggering the gun.

Startup

b. If more coverage is needed, use a larger tip rather than increasing the pressure.

c. Adjust the direction of the spray pattern. See

Fig. 9. Engage the gun safety latch. Loosen the retaining nut (A). Position the tip guard for a horizontal or vertical pattern. Hold the tip guard in place and tighten the retaining nut.

7.

To prime the hose, lower the pressure to reduce splashing. Hold a metal part of the gun firmly against and aimed into a grounded metal pail.

See the preceding WARNING. Hold the gun trigger open and slowly increase the pressure until the pump starts. Keep the gun triggered until all air is forced out of the system and the fluid flows freely from the gun. Release the trigger and engage the gun safety latch.

8.

Check all fluid connections for leaks. Relieve pressure before tightening the connections.


10.

Install the spray tip and tip guard. Install the spray tip. If you are using the RAC IV tip guard, refer to manual 308–644 for installation instructions.

11.

Adjust the spray pattern a. Increase the pressure until spray from the gun is completely atomized. To avoid excessive overspray and fogging, and to extend tip and sprayer life, always use the lowest pressure needed to get the desired results.

NOTE: Spray patterns will change as tips wear.

Change the spray tip if adjusting the pressure will not improve the spray pattern.

1

A

1

2

Fig. 9

For a vertical spray pattern

For a horizontal spray pattern

2

05971

10 308-720

Shutdown and Care

WARNING




Shutdown and Care

1.

Check the packing nut/wet-cup daily (102).

Relieve pressure first. Keep the wet-cup 1/3 full of

TSL at all times to help prevent fluid buildup on the piston rod and premature wear of packings.

2.

Tighten the packing nut/wet-cup (102) just

enough to stop leakage. Over-tightening causes binding and excessive packing wear. Use a round punch or brass rod and a light hammer to adjust the nut. See Fig. 10.

3.

Periodically clean paint residue from the pres-

sure transducer (29) vent hole area. See Fig. 11.

Replace the transducer when leakage is excessive. See page 27.

4.

Lubricate the bearing housing after every 100 hours of operation. Remove the front cover. Fill the bearing housing cavity (A) with SAE 10 nondetergent oil. See Fig. 11.

5.

Flush the sprayer at the end of each work day and fill it with mineral spirits to help prevent pump corrosion and freezing. See page 12.

1

Turn packing nut clockwise to tighten

Fig. 10

1 Vent hole

1

WARNING


See the warning section INJECTION

HAZARD on page 3 for information on the hazard of using damaged hoses.

1 102

29

A

05117

CAUTION

To prevent pump corrosion, and to reduce the chance of fluid freezing in the pump in cold weather, never leave water or any type of paint in the sprayer when it is not in use. Freezing can seriously damage the sprayer or result in a loss of pressure or stalling.

6.

For very short shutoff periods, leave the suction tube in the paint, relieve pressure, and clean the spray tip.

7.

Coil the hose and hang it on a hose rack when storing it, even for overnight, to help protect the hose from kinking, abrasion, coupling damage, etc.

Fig. 11 02827A

308-720 11

When to Flush

Flushing

1.

Before using a new sprayer: flush out the oil which was left in to protect pump parts.

3. Pour one-half gallon (2 liters) of compatible solvent into a grounded metal flushing pail. Put the suction hose in the pail.

Before using water-base paint: flush with mineral spirits followed by soapy water, and then a clean water flush.

4. Open the pressure drain valve. See Fig. 5, page

7.

Before using oil-base paint: flush with mineral spirits only.

2.

Changing colors: flush with a compatible solvent such as mineral spirits or water.

5.

To save the paint still in the pump and hose, follow Step 6, except put the drain tube in the paint pail. When solvent appears, close the drain valve.

Put the drain tube in the flushing pail. Trigger the gun into the paint pail. When solvent appears, release the trigger. Continue with Step 6.

3.

Changing from water-base to oil-base paint: flush with warm, soapy water, and then mineral spirits.

4.

Changing from oil-base to water-base paint: flush with mineral spirits, then warm, soapy water, and then a clean water flush.

5.

Storage after using water-base paint: flush with water and then mineral spirits. Leave the system filled with mineral spirits. Relieve pressure. Leave the drain valve open.

Storage after using oil-base paint: flush with mineral spirits. Relieve pressure. Leave the drain valve open.

CAUTION

Never allow water to freeze in the pressure control.

Doing so prevents the sprayer from being started and may cause serious damage. Push the water out with mineral spirits.

WARNING


To reduce static sparking and splashing, always remove the spray tip from the gun, and hold a metal part of the gun firmly to the side of a grounded metal pail when flushing.

6. Lower the pressure setting. Turn on the sprayer.

Maintaining metal-to-metal contact, trigger the gun into the flushing pail. Slowly increase the sprayer pressure until the pump starts. Keep the gun triggered until the solvent flows freely from the gun. Circulate the solvent to thoroughly clean the sprayer. Release the gun trigger. Engage the gun trigger safety.

7. Open the drain valve and circulate the solvent through the drain tube to thoroughly clean it. Close the drain valve.

6.

Startup after storage. Before using water-base paint, flush out the mineral spirits with soapy water and then clean water. When using oil-base paint, flush out the mineral spirits with the paint.

How to Flush

1. Follow the Pressure Relief Procedure on page 9.

2. Remove the spray tip and clean it separately.

Remove the filter screen and then reinstall the bowl, hand tight, without the screen. Clean the screen separately. (See instruction manual

308–249.)

8. Remove the suction hose from the pail. Disengage the gun trigger safety. Trigger the gun and run the pump a few seconds to push air into the hose. Do not run the pump dry for more than 30 seconds to avoid damaging the pump packings! Relieve pressure.

9. Remove and clean the inlet strainer. Wipe paint off the suction hose and drain tube.

10. Refer to When To Flush, Step 1 again. Relieve pressure.

11. Leave the drain valve open until you use the sprayer again.

12 308-720

Troubleshooting

WARNING


To reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the Pres-

sure Relief Procedure on page 9.

Basic Problem Solving

Check everything in the troubleshooting table before disassembling the sprayer.

TYPE OF PROBLEM

Fluid pressure

Mechanical

Electrical

WHAT TO CHECK

If check is OK, go to next check

1. Check pressure control knob setting. The pump won’t develop much pressure if it is at minimum setting (fully counterclockwise).

2. Check for a clogged spray tip or fluid filter, if used. See page 8.

WHAT TO DO

When check is not OK, refer to this column

1. Slowly increase pressure setting to see if motor starts.

1. Check for frozen or hardened paint in pump

(20). Using a screwdriver, carefully try to rotate fan at back of motor by hand. See page 17.

2. Check pump connecting rod pin (17). It must be completely pushed into connecting rod (15), and retaining spring (18) must be firmly in connecting rod groove. See Fig. 18, page 21.

3. Check for motor damage. Remove drive housing assembly (11). See page 24. Try to rotate motor fan by hand.

1. Check electrical supply with volt meter. Meter should read 105–125 VAC.

2. Check extension cord for visible damage. Use a volt meter or test lamp at extension cord outlet to check.

3. Check sprayer power supply cord (50) for visible damage such as broken insulation or wires.

4. Check motor brushes for the following: a. Loose terminal screws.

b. Broken or misaligned brush springs.

c. Brushes binding in holders.

d. Broken leads.

e. Worn brushes.

NOTE: The brushes do not wear at same rate on both sides of motor. Check both brushes.

2. If tip is still clogged, relieve pressure; refer to separate gun or tip instruction manual for tip cleaning. Clean or replace filter element. See manual 308–249.

1. Thaw. Plug in sprayer and turn on. Slowly increase pressure setting to see if motor starts. If it doesn’t, see NOTE, below.

2. Push pin into place and secure with spring retainer.

3. Replace motor (4) if fan won’t turn. See page 22.

1. Reset building circuit breaker; replace building fuse. Try another outlet.

2. Replace extension cord.

3. Replace power supply cord.

See page 23.

4. Refer to page 19.

a. Tighten.

b. Replace broken spring and/or align spring with brush c. Clean brush holders. Remove carbon with small cleaning brush. Align brush leads with slot in brush holder to assure free vertical brush movement.

d. Replace brushes e. Replace brushes if less than 0.5 in.

long.

NOTE: Thaw sprayer if water or water–based paint has frozen in it, due to exposure to low temperatures, by placing in a warm area. Do not try to start sprayer until completely thawed or damage to motor and/or start board may occur. If paint hardened

(dried) in sprayer, the pump packings (page 21) and/or pressure transducer (page 27) must be replaced.

308-720 13

TYPE OF PROBLEM

Electrical (continued)

TYPE OF PROBLEM

Low output

Basic Problem Solving

WHAT TO CHECK


5. Check motor armature commutator for burn spots, gouges and extreme roughness. Remove motor cover and brush inspection plates to check. See page 19.

6. Check motor armature for shorts using armature tester (growler) or perform motor test.

See page 17.

7. Check leads from pressure control and motor to motor start board (47) to be sure they are securely fastened and properly mated.

8. Check motor start board (47) by substituting with a good board. See page 23.

CAUTION: Do not perform this check until motor armature is determined to be good. A bad motor armature can burn out a good board.

9. Check power supply cord (50). Disconnect black and white power cord terminals; connect volt meter to these leads. Plug in sprayer. Meter should read 105–125 VAC. Unplug sprayer.

10. Check ON/OFF switch (52). Disconnect the motor start board (47) and switch and connect volt meter between exposed terminal on switch and power cord’s white wire. Plug in sprayer and turn ON. Meter should read 105–125 VAC

Turn off and unplug sprayer.

11. Check motor thermal cutout switch. Connect ohmmeter between motor’s red leads. Meter should read 1 ohm maximum.

12. Remove pressure control (64) and check microswitch operation with ohmmeter:

(1) With pressure knob at lowest setting and stem pushed into control, readings should be: white & black = 1 ohm max.

white & red = open.

(2) With pressure knob at highest setting,readings should be: white & black = open; white & red = 1 ohm max.

13. Check pressure transducer (29) for hardened paint or damaged or worn components. See page 27.

WHAT TO DO


5. Remove motor and have motor shop resurface commutator if possible. See page 22.

6. Replace motor. See page 22.

7. Replace loose terminals; crimp to leads.

Be sure male terminal blades are straight and firmly connected to mating part.

8. Replace board. See page 23.

9. Replace power supply cord. See page

23.

10. Replace ON/OFF switch. See page 23.

11. Allow motor to cool. Correct cause of overheating. If switch remains open after motor cools, replace motor.

12. Replace pressure control. See page 26.

13. Replace transducer. See page 27. Thorough system flushing will help extend life of transducer.

Intermediate Problem Solving

WHAT TO CHECK


1. Check for worn spray tip.

2. Be sure pump does not continue to stroke when gun trigger is released. Plug in and turn on sprayer. Prime with paint. Trigger gun momentarily, then release and lock safety latch.

Relieve pressure, turn off and unplug sprayer.

WHAT TO DO

When check is not OK refer to this column

1. Follow Pressure Relief Procedure then replace tip. See your separate gun or tip manual.

2. Service pump. See page 21.

14 308-720


TYPE OF PROBLEM

Low output (continued)

Drain valve leaks

Transducer leaks

No output: motor runs and pump strokes

WHAT TO CHECK


3. Release gun trigger. Observe resting position of pump rod (107).


WHAT TO DO


3. If pump consistently comes to rest with rod (107) fully extended, the piston packings and/or piston valve may be worn.

Service the pump. See page 21.

4. Reset building circuit breaker; replace building fuse. Repair electrical outlet or try another outlet.

5. Replace with a correct, grounded extension cord.

5. Check extension cord size and length; must be at least 12 gauge wire and less than 150 ft

(45 m) long.

6. Check motor brushes. See Electrical – What To

Check, item 4, on page 13.

7. Check motor start board (47) by substituting with a good board.


8. Check motor armature for shorts by using an armature tester (growler) or perform motor test.

See page 17.

1. Check drain valve for correct torque and/or worn parts. Check for debris trapped on seat.

6. See page 19.



1. Slight leakage from transducer is normal.

1. Check paint supply.

9. Tighten to 185 in–lb (21 N.m). Clean valve and replace with new gasket (42a) and sealant (42d). See page 28.

1. Periodically remove residue from its cylinder port. See page 27.

1. Refill and reprime pump.

No output: motor runs but pump does not stroke

2. Check for clogged intake strainer.

3. Check for loose suction tube or fittings. See page 27.

4. Check to see if intake valve ball and piston ball are seating properly. See page 21.

5. Check for leaking around throat packing nut which may indicate worn or damaged packings.

See page 21.

6. Release gun trigger. Observe resting position of pump rod (107).

1. Check displacement pump connecting rod pin

(17). See Fig. 18, page 21.

7. Check connecting rod assembly (15) for damage. See page 24.

8. Be sure crank in drive housing rotates; plug in sprayer and turn on briefly to check. Turn off and unplug sprayer. See page 24.

2. Remove and clean, then reinstall.

3. Tighten; use thread sealant on npt threads of adapter (38).

4. Remove intake valve and clean. Check ball and seat for nicks; replace as needed. See page 21. Strain paint before using to remove particles that could clog pump.

5. Replace packings. See page 21. Also check piston valve seat for hardened paint or nicks and replace if necessary.

Tighten packing nut/wet-cup.

6. If pump consistently comes to rest with rod (107) fully extended, the piston packings and/or piston valve may be worn.

Service the pump. See page 21.

1. Replace pin if missing. Be sure retainer spring (18) is fully in groove all around connecting rod.

7. Replace connecting rod assembly. See page 24.

8. Check drive housing assembly for damage and replace if necessary. See page 24.

308-720 15


TYPE OF PROBLEM

Spray Pattern Variations

Motor Is Hot and Runs

Intermittently

Building Circuit Breaker

Opens As Soon As

Sprayer Switch Is

Turned On.

WHAT TO CHECK


1. Spray tip worn beyond sprayer pressure capability.

2. Check transducer (29) for wear or damage.

3. Check pressure control (64) for smooth operation.

4. Check Low output section, page 15.

1. Determine if sprayer was operated at high pressure with small tips, which causes excessive heat build up.

2. Be sure ambient temperature where sprayer is located is no more than 90 F (32 C) and sprayer is not located in direct sun.

3. Check motor.

1. Check all electrical wiring for damaged insulation, and all terminals for loose fit or damage.

Also check wires between pressure control and motor. See page 22.

WHAT TO DO


1. Replace spray tip.

NOTE: A smaller size tip will provide longer life.

2. Replace transducer. See page 27.

3. Replace pressure control. See page 26.

1. Decrease pressure setting or increase tip size.

2. Move sprayer to shaded, cooler area if possible.


1. Repair or replace any damaged wiring or terminals. Securely reconnect all wires.

2. Check for missing motor brush inspection plate gasket (see page 17), bent terminal forks or other metal to metal contact points which could cause a short.

3. Check motor armature for shorts. Use an armature tester (growler) or perform motor test. See page 17. Inspect windings for burns.

4. Check motor start board (47) by substituting with a good board.


1. Check ‘Basic Problems – Electrical’ on page

13.

2. Correct faulty conditions.



Circuit breaker opens after sprayer operates for 5 to 10 minutes.

Building circuit breaker opens as soon as sprayer is plugged into outlet and sprayer is NOT turned on.

Unit will not run on generator but does run on AC power

1. Check ON/OFF switch (52). Be sure sprayer is unplugged! Disconnect wires from switch.

Check switch with ohmmeter. The reading should be infinity with ON/OFF switch OFF, and zero with switch ON.

CAUTION: A short in motor circuit can damage switch and or motor start board (47).


Check the generator’s peak voltage. This sprayer will not run if the peak voltage is above 190V.

1. Replace ON/OFF switch. See page 23.

2. If voltage is too high, do not operate sprayer until corrected.

Use AC power or a different generator

16 308-720

Motor Test

WARNING




For checking armature, motor winding and brush electrical continuity.

Setup

Remove the drive housing. See page 24. This is to ensure that any resistance you notice in the armature test is due to the motor and not to worn gears in the drive housing.

Remove the motor brush inspection covers (A).

See

Fig. 12.

Remove the junction box screws (56). Lower the junction box. Disconnect the two leads (C) from the motor to the board (47). See Fig. 13.

Armature Short Circuit Test

Remove the fan cover (B). See Fig. 12.

Spin the motor fan by hand. If there are no shorts, the motor will coast two or three revolutions before coming to a complete stop. If the motor does not spin freely, the armature is shorted and the motor must be replaced. See page 22.

Armature, Brushes, and Motor Wiring

Open Circuit Test (Continuity)

Connect the two black motor leads together with a test lead. Turn the motor fan by hand at about two revolutions per second.

When turning the fan on a DC motor, normally you sense an even, pulsing resistance. If there is irregular turning resistance, or no turning resistance, check and repair the following as needed: broken brush springs, brush leads, motor leads; loose brush terminal screws or motor lead terminals; worn brushes. See page 19.

If there is still uneven or no turning resistance, replace the motor. See page 22.

Fig. 12

59

BLACK/

WHITE

BLACK

C

Fig. 13

MOTOR

A

47

RED

56

B

02829A

04720

308-720 17

General Repair Information

WARNING




WARNING

HOT SURFACE HAZARD

During operation, the motor and drive housing become very hot and could burn your skin if touched. Flammable materials spilled on the hot, bare motor could cause a fire or explosion

Tool List

These are the tools required to service all parts of the sprayer.

3/16” Allen wrench: gear housing, legs, handle

3/8” Allen wrench: pump manifold

#1 Phillips screwdriver: junction box, pressure control, front cover

3/8” socket wrench: motor mount

5/8” socket wrench: drain valve, outlet fittings, on/off switch boot, piston

13/16” socket wrench: drain valve

1-1/4” socket wrench: pump inlet valve

1/2” open end wrench: pump rod

11/16” open end wrench: piston jam nut

15/16” open end wrench: flats of inlet tube

1-3/4” open end wrench: pump jam nut

5/64” drive pin: drain valve pin

3” needle nose pliers: wiring, on/off switch

Hammer & punch: packing nut

Torque wrenches: various fasteners

CAUTION

To reduce the risk of a pressure control malfunction, be sure to properly mate connectors, and never pull on a wire to disconnect it. Pulling on a wire could loosen the connector from the wire.

1.

When disconnecting wires in the junction box assembly, use needle nose pliers to separate mating connectors.

2.

When reconnecting the wires, be sure the flat blade of the insulated male connector is centered in the wrap–around blade of the female connector.

WARNING


To reduce the risk of serious injury, including electric shock, DO NOT touch any moving parts or electrical parts with your fingers or a tool while inspecting the repair.

Shut off the sprayer and unplug it as soon as you complete the inspection.

Reinstall all covers, gaskets, screws and washers before operating the sprayer.

CAUTION

Improper wire routing can result in poor sprayer performance or damage to the pressure control.

3.

Route wires carefully through the drive housing and motor. Avoid pinching the wires between the junction box and the motor or pressure control.

4.

Keep all screws, nuts, washers, gaskets, and

electrical fittings removed during repair procedures. These parts are not normally provided with replacement assemblies.

5.

Test your repair before regular operation to be sure the problem is corrected.

6.

If the sprayer does not operate properly, verify that everything was done correctly. Also refer to the Troubleshooting Guide, pages 13–17, to help identify other possible problems and solutions.

18 308-720

Motor Brushes

NOTE: Replace brushes when worn to about 0.5 in.

(12.5 mm). Always check both brushes. Brush Repair

Kit 236–967, which includes spring clip 112–766, is available for motors manufactured by Pacific Scientific.

NOTE: Replacement brushes may last only half as long as the original ones. To maximize brush life, break in new brushes by operating the sprayer for at least one hour with no load (remove the pump connecting rod pin).

3 F

G

2

H

C

WARNING




1. Remove both inspection covers (A) and their gaskets. See Fig 14.

1 Motor lead; do not disconnect

2 Minimum 0.5” (12.5 mm)

3 Included in Brush Repair

Kit 236–967

1

B

E

Fig. 15

D

03881

4. Inspect the commutator for excessive pitting, burning or gouging. A black color on the commutator is normal. Have the commutator resurfaced by a qualified motor repair shop if the brushes seem to wear too fast or arc excessively. See Step 9.d., also.

5. Repeat for the other side.

NOTE: The motor brushes on the other side are upside down.

6. Place a new brush (C) in the holder (B) so the ramp (H) faces the spring. See Fig. 16.

A

F

1

G

02831A

Fig. 14

2. Push in the spring clip (F) and release its hook (G) from the brush holder (B). Pull out the spring clip.

See Fig 15.

3. Slide off the brush lead terminal (E) off the blade connector. Remove the old brush (C). See Fig 15.

C

Fig. 16

E

03881

7. Holding the spring clip (F) at a slight angle, slide the spring clip into the brush holder and hook it over the end of the holder. See Fig. 16. Pull on the spring clip to be sure it stays in place. Connect the brush lead to the blade connector (E).

8. Repeat for the other side.

308-720 19

Motor Brushes

9.

Test the brushes.

a. Remove the pump connecting rod pin (17).

See Fig. 18, page 21.

b. With the sprayer OFF, turn the pressure control knob fully counterclockwise to minimum pressure. Plug in the sprayer.

c. Turn the sprayer ON. Slowly increase the pressure until the motor is at full speed.

d. Inspect the brush and commutator contact area for excessive arcing. Arcs should not trail or circle around the commutator surface.

WARNING


Do not touch the brushes, leads, springs or brush holders while the sprayer is plugged in to reduce the risk of electric shock and serious injury.

10. Install the brush inspection covers and gaskets.

11.

Break in the brushes. Operate the sprayer for at least one hour with no load. Install the pump connecting rod pin. See Fig. 18, page 21.

Displacement Pump Repair

WARNING




NOTE: Packing Repair Kit 235–703 is available.

Reference numbers of parts included in the kit are marked with an asterisk, i.e., (121*). For the best results, use all the new parts in the kit, even if the old ones still look good.

NOTE: To minimize down time, and for the best sprayer performance, check the motor brushes (see page 19) and clean the transducer (see page 27) whenever you repack the pump. Replace these parts as needed.

Removing the pump

(See Fig. 17.)

1. Flush the pump, if possible. Relieve pressure. Stop the pump with the piston rod (107) in its lowest position, if possible. To lower the piston rod manually, rotate the motor fan blades.

2. Remove the filter (85).

3. While pulling upward on the suction hose (32), unscrew the hose from the inlet tube (38). Unscrew the drain hose (33) from the displacement pump nipple (36).

2. Align the hole in the rod (107) with the connecting rod assembly (15). Use a screwdriver to push the retaining spring (18) up and push in the pin (17).

Push the retaining spring (18) into place around the connecting rod.

3. Replace the o-ring (27) if it is worn or damaged.

Reconnect the suction and drain hoses (32,33).

Install the front cover (13).

4. Tighten the packing nut (102) just enough to stop leakage, but no tighter. Fill the packing nut/wet-cup

1/3 full with Graco TSL. Push the plug (123) into the wet-cup.

13

18

85

107

1 21

20

17

*122

120

4. Use a screwdriver to push the retaining spring (18) up and push out the pin (17).

36

118

*121

*119

5. Loosen the screws (21). Remove the pump (20).

Repairing the pump

See manual 308–190 for pump repair instructions.

Installing the pump

(See Fig. 17 and 18.)

1. Mount the pump on the drive housing. Tap it into the alignment pins with a soft hammer. Tighten the screws (21) to 50 ft-lb (68 N.m).

33

32

27

38

Fig. 17

2

1

2

Torque to

50 ft–lb (68 N.m)

Apply anaerobic polyacrylate pipe sealant

02832B

17

WARNING


Be sure the retaining spring (18) is firmly in the groove all the way around, to prevent the pin (17) from working loose due to vibration.

See Fig. 18.

If the pin works loose, it or other parts could break off due to the force of the pump action. These parts could be projected into the air and result in serious injury or property damage, including the pump connecting rod or drive housing.

1

15

123

Torque to

50 ft–lb (68 N.m)

Fig. 18

21

1

18

102

04655

308-720 21

WARNING




NOTE: See Fig. 21 except where noted.

1. Relieve pressure.

2. Try to stop the pump with the piston rod (107) in its lowest position. To lower the piston rod manually, rotate the motor fan blades. Use a screwdriver to push the retaining spring (18) up and push out the pin (17). See Fig. 19.

Motor

8. Remove the two screws (46) and lift the motor off the base (66).

9. Align the new motor with the base and reinstall the screws (46).

10. Assemble the drive housing to the motor. Follow steps 8 to 10 on page 24.

11. Connect the wires in the junction box. Refer to Fig.

22 on page 23. Install the junction box.

12. Connect the piston rod (107) to the drive housing; see page 21, Installing the Pump, Step 2 and the

WARNING following it.

17

15

3. Remove the screws (56) and lower the junction box (59). Disconnect the motor wires and the pressure control wire (A) from the motor start board. Refer to Fig. 22 on page 23.

4. Remove the front cover (13).

5. Turn the displacement pump rod (107) so the pin hole aligns with the bottom drive housing screw

(19). See Fig. 20. Remove the three drive housing screws and lockwashers (19,6). Also see Fig. 21.

6. Remove the two motor screws (5) and the lock washers (6).

7. Tap the lower rear of the drive housing (11) with a plastic mallet to loosen the motor. Pull the drive housing straight off the motor while guiding the harness (A) from the motor. Do not allow the gear

(16) to fall. Read the CAUTION on page 24.

Fig. 19

Fig. 20

A

107

4

18

19,6

01068

01074

12

16

B

C

1

6

5

11

1 Torque to 21 in–lb (2.4 N.m)

2 Quantity of three

3 Quantity of one

1 19

6

59 46

3

13

31 56

34 2

Fig. 21 05119

Motor Start Board

WARNING




NOTE: See Fig. 22 for this procedure.


2. Remove the junction box screws (56) and lower the junction box (59).

3. Disconnect the motor wires (B) and the 3-wire connector (A) from the motor start board (47).

Observe where connections are made.

4. Remove the screws (58) and motor start board

(47). Transfer the white thermal paste from the old board to the new board.

5. Install the new motor start board. Reconnect all wires. Install the junction box. Be sure no leads are pinched against the motor or by the motor start board. Also be sure the gasket (89) is installed.

CAUTION

Be sure the flat blade of the insulated male connector is centered in the wrap–around blade of the female connector when the connections are made.

Route all wires carefully to avoid interference with the motor start board or junction box.

These precautions are essential to reduce the risk of a malfunction.

Power Supply Cord




3. Disconnect the power supply cord leads, including the green wire to the grounding screw (49).

4. Loosen the strain relief bushing (51). Remove the power supply cord (50).

5. Install the new cord (50) in the reverse order of disassembly.

6. Install the junction box. Be sure no leads are pinched against the motor or by the motor start board. Also be sure the gasket (89) is installed.

On/Off Switch




3. Remove the nut and rubber boot (55).

4. Disconnect the black wires from the ON/OFF switch (52) and remove the switch.

5. Place the ring terminal of the ground wire (53) over the barrel of the new switch. Install the switch so the internal tab of the anti-rotation ring (54) engages with the vertical groove in the threads of the switch, and the external tab engages with the blind hole (C) of the junction box.

6. Powder the inside of the rubber boot (55) with talcum, then shake the excess out of the boot.

Install the nut and rubber boot and tighten.

7. Reconnect the ON/OFF switch black wires.

8. Install the junction box. Be sure no leads are pinched against the motor or by the motor start board. Also be sure the gasket (89) is installed.

MOTOR

GREEN

49

53

GREEN/

YELLOW

50

51

89

52

59

BLACK/

WHITE

BLACK

B

54

55

58

A

RED

56

C

47

Fig. 22 04720

Drive Housing, Connecting Rod, Crankshaft

WARNING




Removal

NOTE: Inspect parts as they are removed. Replace parts that are worn or damaged.

1. Remove the displacement pump. See page 21.

2. Remove the pressure control (64). See page 26.

3. Turn the displacement pump rod (107) so the pin hole aligns with the bottom drive housing screw

(19). See Fig. 23. Remove the three drive housing screws and lockwashers (19,6). Also see Fig. 24 on page 25.

107

19,6

Fig. 23

01074

4. Remove the two motor screws (5) and lock washers (6). See Fig. 24 on page 25.

5. Tap the lower rear of the drive housing (11) with a plastic mallet to loosen the motor. Pull the drive housing straight off the motor.

CAUTION

Do not allow the gear (16) to fall; it may stay attached to the drive housing or to the motor.

Do not lose the thrust balls (11a or 4a) or let them fall between the gears, which will damage the drive housing if not removed. The balls, which are heavily covered with grease, usually stay in the gear recesses, but could be dislodged. If the balls are not in place, the bearings will wear prematurely.

6. Remove and inspect the crankshaft (12) and the connecting rod (15).

Installation

7. Install the connecting rod.

8. Lubricate the inside of the drive housing bearing with SAE non-detergent oil. Pack the roller bearing and gears with the grease supplied.

NOTE: The gears and bearings between the drive housing (11) and motor front end bell (C) should contain a total of 3 fl. oz. (29 cc) of grease.

9. Place the large washer (12a) and then the small washer (12b) on the crankshaft (12).

10. Lift the crank to the top of the stroke and insert crankshaft (12). Align the gears and push the drive housing (11) straight onto the motor and the locating pins. Install the screws (19, 5) and their lockwashers (6). Torque to 80 in–lb (9 N.m).

11. Install the displacement pump. See page 21.

12. Install the pressure control (64). See page 26.

Install the front cover (13).

Drive Housing, Connecting Rod, Crankshaft

64

REF A

12a

4 12

11a

1

16

12b

4a

C

5,6

1 Torque to 21 in–lb (2.4 N.m)

2 Quantity of three

3 Quantity of one

4 Apply a total of

3 fl. oz.(89 cc) of grease to gears.

A

47

59

56

3

31

Note: Filter not shown 13

15 19

1

6

11

34 2

02815

Fig. 24

Pressure Control

WARNING





NOTE: The pressure control (64) cannot be repaired or adjusted. If it has malfunctioned, replace it.

1. Remove the front cover (13). Remove the screws

(56). Lower the junction box (59).

2. Disconnect the harness connector (A) from the motor start board (47).

3. Remove the screws (63). Pull forward on the pressure adjusting knob and tip the pressure control (64) forward and up to detach it from the drive housing (11).

4. Guide the harness (A) through the motor and drive housing and remove the pressure control.

5. Guide the harness of the new pressure control through the drive housing and motor passages.

6. Install the new pressure control. Tip the pressure control down and back into the drive housing (11).

Do not pinch or damage the harness (A).

7. Loosely install the screws (63) and then torque them to 21 in–lb (2.4 N.m).

8. Install the front cover (13). Connect the harness

(A) to the motor start board (47).

9. Install the junction box. Be sure no leads are pinched against the motor or by the motor start board.

A

Fig. 25

56

59

64

63 1

1

11

13

Torque to

21 in–lb (2.4 N.m)

02816A

Pressure Transducer

WARNING





1. Remove the displacement pump. See page 21.

2. Use a pull–twist motion to remove the transducer

(29) from the pump manifold (101).

3. Clean paint residue from the hole in the manifold; do not scratch the surface of the hole.

4. Lightly apply oil to the o-ring of the new transducer.

5. Install the transducer in the pump manifold, while guiding the o-ring and backup ring into place.

6. Align the holes in the transducer as shown by the arrows in Fig. 26.

Fig. 26

7. Install the displacement pump. See page 21.

Suction Hose

29

101

WARNING




1. Remove the drain hose (33) from the clip. Remove the front cover (13).

CAUTION

Misalignment or cross-threading will damage the parts and/or create shavings which can cause the o–ring (27) to leak.

1 Lubricate

Note: Filter not shown

13

02817A

2. Pull upward on the hose (32) while unscrewing it from the inlet tube (38). The hose coupling (A) threads will engage and the hose will separate from the tube.

33

3. Replace the o–ring (27) if it is worn or damaged.

36

4. Lubricate the o–ring (27) and the inlet tube (38) threads with light grease.

1

32

27

A

5. Align the suction hose coupling with the threads of the inlet tube (38). Tighten the hose onto the tube at least 4 turns to ensure that the threads have disengaged and can function as a swivel joint.

Fig. 27

38

06978

Drain Valve

WARNING




Repair

1. Unscrew the spring retainer from the valve body.

Remove the spring, washers and stem/ball. Clean any debris from the ball or seat area.

2. If replacing the gasket (42a) or seat (42b), pry out the gasket.

42a

42b

1

42d

42c

1

2

3

Apply thread sealant

Apply grease to face of base

Torque into pump manifold to 185 in–lb

(21 N.m)

NOTE: Whenever the gasket (42a) is removed, replace it with a new one.

3. Coat the o-ring (42d) with grease. Press the stem into the valve body. Install the spring, washers and spring retainer into the valve body.

4 Handle shown in closed position

3

42

2

4. Place the seat (42b) in the valve body so the lapped side is toward the ball. Apply a small amount of grease to the new gasket (42a) and install it in the valve body.

43

44

Fig. 28

4

45

02819

1. Turn the handle (45) to the closed position. Drive out the pin (44). Remove the handle.

2. Remove the base (43).

3. Unscrew the drain valve (42). The gasket (42a) and seat (42b) will stay in the valve.

NOTE: The gasket will protrude from the end of the valve until the valve is tightened into pump, which correctly seats the gasket.

Replacement

1. Apply a small amount of thread sealant (42e) onto the valve (42) threads. Tighten the valve into the pump manifold to 185 in–lb (21 N.m).

2. Lightly grease the face of the base (43) and install the base. Turn the stem so the pin hole is vertical.

3. Securely install the handle (45) and drive pin (44).

Notes

Sprayer Parts Drawing


39

10

28

30

REF 32

35

OUTSIDE

LABEL

14

INSIDE

LABEL

31

85

13

34 21

32

27

63

19

15

17

6

18

REF 33

64

28

1

2

Label

See detail on page 31

74

67

24

4e 1

3

11b

12a

12

16

12b

4a

4

6

5

11a

26

11

66

2

29

42a

42b

42d

42c

20

42

36

43

44

33

38

45

37

25

23 46

23

50

56

4f

4g

1

1

89

06974C

Sprayer Parts List


Includes items 3 to 89 as listed below

Ref.

No.

Part No.

Description Qty.

Ref.

No.

Part No.

Description

37

38

39

42

3

4 {

4a

4b

4c

4g

5

6

10

11

111–700 GRIP, handle

238–344 MOTOR KIT

100–069 . BALL, sst, 1/4” dia.

111–616

107–504

Includes items 4a to 4g

. TERMINAL, flat, 1/4” (f), 18 awg

. TERMINAL, 3/16” (m), 16 awg

4d Y 187–784 . LABEL, DANGER, French

1

4e Y

4f Y

187–791 . LABEL, DANGER, English 1

187–975 . LABEL, WARNING, electric shock 1

2

1

1

1

1

107–503

100–643

105–510

100–721

224–965

. TERMINAL, 3/16” (f)

SCREW, socket head, 1/4–20 x 1”

LOCKWASHER, 1/4”

PLUG, 1/4–18 npt(f)

DRIVE HOUSING KIT

Includes item 11a, 1 1b

5

1

1

2

1

1

1

1

29

30

31

32

33

34

35

36

21

23

24

25

26

27 H

28

11a

11b

12

12a

12b

13

14 Y 177–762 LABEL, WARNING

15

16

17

18

107–434 . BEARING

187–789 COVER, front

218–359

218–364

176–818

176–817

CONNECTING ROD

GEAR REDUCER

PIN, headless, 3/8” dia. x 1”

SPRING, retaining

19

100–069 . BALL, stainless steel, 1/4” dia.

111–726 . PLUG

224–803 CRANKSHAFT

Includes items 12a, 12b

180–131 . BEARING, thrust

20

103–345 SCREW, socket head,

1/4–20 x 1–1/4”

235–699 PUMP KIT

See manual 308–190 for parts

111–706

111–715

CAPSCREW, 7/16–14 x 1–3/4”

SCREW, 5/16–18 x 1–1/4”

192–166 HANDLE, sprayer

112–759

239–276

104–938

162–453

CAP, tubing

LEG, with gusset

O–RING

NIPPLE, hex, 1/4 npsm x

1/4 npt, 1–3/16”

235–009 PRESSURE TRANSDUCER

114–026 CLIP, 3/4”

108–850 SCREW, filh, 8–32 x 1–1/4”

187–624 SUCTION HOSE & TUBE

187–652 DRAIN HOSE

111–705 SCREW, filh, 8–32 x 2–1/2”

290–377 LABEL, identification

111–612 ADAPTER, tube, 9/16–18

1

2

4

1

6

1

1

2

1

1

1

1

1

1

1

1

3

1

3

1

1

1

1

1

1

1

1

2

1

42a

42b

187–628 LEG, sprayer

192–167 INLET TUBE

235–004 STRAINER

235–014 DRAIN VALVE KIT

111–699

Includes items 42a to 42e

. GASKET, valve seat

187–615 . SEAT, drain valve

42c 224–968 . STEM, drain valve

42d H 168–110 . O–RING, stem

42e 110–110 . SEALANT, pipe (not shown)

1

1

1

1

1

56

58

59

63

64

66

67

52

53

54

55

43

44

45

46

224–807 BASE, valve

111–600 PIN, grooved, 3/32 x 1”

187–625 HANDLE, drain valve

47

110–997 SCREW, washer/hex hd, 5/16”

48 Y 186–620 LABEL, ground terminal

49

235–008 MOTOR START BOARD

110–037 SCREW, mach, pnhd, 10–24 x 5/8”

50

51

235–010 POWER CORD SET

111–617 STRAIN RELIEF BUSHING,

3/8–18 npt

105–679 SWITCH, ON/OFF

235–035 GROUND HARNESS

105–658 LOCKING RING

105–659 BOOT, switch

111–703

187–795

111–704

SCREW, filh, 10–24 x 3”

100–035 SCREW, pan hd, 8–32 x 5/16”

JUNCTION BOX

SCREW, filh, 10–24 x 1–5/8”

239–515 PRESSURE CONTROL KIT

189–932 BASE, motor

238–350 CONTRACTOR FTx GUN


68

74

85

206–994 TSL, 8 oz. (not shown)

238–361 HOSE, grounded, nylon; 1/4” ID; cpld 1/4 npsm(f); 50 ft (15 m);’ spring guards both ends

239–447 FILTER, fluid

See Manual 308–249 for parts

89 187–963 GASKET

Y Extra warning labels available free of charge.

{ Motor Brush and Spring Replacement Kit,

236–967 is available. Purchase separately .

H Replace Ref. No. 27 with 114–048 and Ref. No. 42d with

112–319 if using severe solvents such as lacquer thinner and acetone.

Qty.

1

1

1

1

2

1

1

1

1

1

1

1

1

1

2

4

2

1

1

1

1

1

1

1

59

58

48

4g

BLACK/

WHITE

BLACK

4b

MOTOR

47

GREEN

49

53

GREEN/

YELLOW

50

51

4c

RED

52

54

55

04720

308-720 31

Sprayer Parts Drawing


62

23

3

39

66 REF

24 REF

72

30

4e 1

REF 33

REF 32

85

4 6

5

64

24

11b

12a

12

16

12b

4a

4f 1

4g

1

66

63

17

15

19

6

46

10

28

OUT-

SIDE

35

LABEL

14

INSIDE

LABEL

13

31

34

18

28

21

32

27

38

11a 89

59

11

29 50

42a

42b

42d

42c

20

42

36

33

43

44

45

2

56

25

65

26

37

74

67

1 Label

2 See page 33 for detail

O5120A

Sprayer Parts List


Includes items 3 to 89 as listed below

Ref.

No.

Part No.

Description Qty.

Ref.

No.

Part No.

Description

3

4 {

4a

4b

4c

4g

5

6

10

11

280–290 SLEEVE, cart

238–344 MOTOR KIT

100–069 . BALL, sst, 1/4” dia.

111–616

107–503

Includes items 4a to 4f

. TERMINAL, flat, 1/4” (f), 18 awg

. TERMINAL, 3/16” (m), 16 awg

4d Y 187–784 . LABEL, DANGER, French

2

4e Y

4f Y

187–791 . LABEL, DANGER, English 1

187–975 . LABEL, WARNING, electric shock 1

2

1

1

1

1

107–503

100–643

105–510

100–721

224–965

. TERMINAL, 3/16” (f)

SCREW, socket head, 1/4–20 x 1”

LOCKWASHER, 1/4”

PLUG, 1/4–18 npt(f)

DRIVE HOUSING KIT

Includes item 11a, 1 1b

3

1

1

3

1

1

1

1

34

35

36

37

38

39

42

29

30

31

32

33

21

23

24

25

11a

11b

12

12a

12b

13

14 Y 177–762 LABEL, WARNING

15

16

17

18

107–434 . BEARING

187–789 COVER, front

218–359

218–364

176–818

176–817

CONNECTING ROD

GEAR REDUCER

PIN, headless, 3/8” dia. x 1”

SPRING, retaining

19

20

100–069 . BALL, stainless steel, 1/4” dia.

111–726 . PLUG

224–803 CRANKSHAFT

Includes items 12a, 12b

180–131 . BEARING, thrust

103–345 SCREW, socket head,

1/4–20 x 1–1/4”

235–699 PUMP KIT


111–706 CAPSCREW, 7/16–14 x 1–3/4”

112–620 SCREW, 6–32 x 0.187”

189–934 HANDLE, sprayer

26

27

28

H

112–759 CAP, tubing

110–849 WHEEL, sprayer

104–938 O-RING

162–453 NIPPLE, hex, 1/4 npsm x

1/4 npt, 1–3/16”

235–009 PRESSURE TRANSDUCER

114–026 CLIP, 3/4”

108–850 SCREW, filh, 8–32 x 1–1/4”

187–624 SUCTION HOSE & TUBE

187–652 DRAIN HOSE

111–705 SCREW, filh, 8–32 x 2–1/2”

290–377 LABEL, identification

111–612 ADAPTER, tube, 9/16–18

112–612 HUBCAP, wheel

192–167 INLET TUBE

235–004 STRAINER

235–014 DRAIN VALVE KIT

Includes items 42a to 42e

1

2

4

1

2

2

1

2

1

1

1

1

1

1

1

1

5

1

1

1

1

2

3

1

1

1

1

1

1

42a

42b

111–699 . GASKET, valve seat

187–615 . SEAT, drain valve

42c 224–968 . STEM, drain valve

42d H 168–110 . O–RING, stem

42e 110–110 . SEALANT, pipe (not shown)

43 224–807 BASE, valve

1

1

1

1

1

1

58

59

62

63

64

65

52

53

54

55

56

66

67

44

45

46

47

111–600 PIN, grooved, 3/32 x 1”

187–625 HANDLE, drain valve

110–997 SCREW, washer/hex hd, 5/16”

235–008 MOTOR START BOARD

48 Y 186–620 LABEL, ground terminal

49

50

110–037

235–010

SCREW, mach, pnhd, 10–24 x 5/8”

POWER CORD SET

51 111–617 STRAIN RELIEF BUSHING,

3/8–18 npt

105–679 SWITCH, ON/OFF

235–035 GROUND HARNESS

105–658 LOCKING RING

105–659 BOOT, switch

111–703 SCREW, filh, 10–24 x 3”

68

72

74

100–035 SCREW, pan hd, 8–32 x 5/16”

187–795 JUNCTION BOX

109–567

111–704

PIN, handle

SCREW, filh, 10–24 x 1–5/8”

239–515 PRESSURE CONTROL KIT

109–570 WASHER, cart

235–735 FRAME, cart

238–350 CONTRACTOR FTx GUN


206–994 TSL, 8 oz. (not shown)

178–565 BUTTON, spring

238–361 HOSE, grounded, nylon; 1/4” ID; cpld 1/4 npsm(f); 50 ft (15 m);’

85

89 spring guards both ends

237–447 FILTER, fluid

187–963

See Manual 308–249 for parts

GASKET

Y Extra warning labels available free of charge.

{ Motor Brush and Spring Replacement Kit,

236–967 is available. Purchase separately .

H Replace Ref. No. 27 with 114–048 and Ref. No. 42d with

112–319 if using severe solvents such as lacquer thinner and acetone.

MOTOR

Qty.

1

1

1

2

1

1

1

1

1

1

1

2

1

2

2

2

1

1

2

1

1

1

1

1

1

4

59

58

48

4g

BLACK/

WHITE

BLACK

4b

47

GREEN

49

53

GREEN/

YELLOW

50

51

4c

RED

52

54

55

04720

Technical Data

Power Requirements . . . . . . . . . . . . . . . . . . . 120 VAC, 60 Hz,

1 phase, 15A minimum

Generator

Motor

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3000W minimum

Working Pressure Range 0–3000 psi (0–210 bar, 0–21

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

Cycles/Gallon (liter) . . . . . . . . . . . . . . . . . . . . . . . . . . .

MPa )

5/8 hp

620 (164)

Delivery

Tip Size

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

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

0.44 gpm (1.66 lpm) one gun to 0.021 new tip with latex at 2000 psi (138 bar, 13.8 MPa )

Power Cord . . . . . . . . . . . . . . . . . .

Inlet Paint Strainer

14 AWG, 3 wire, 6 ft (1.8 m)

. . . . . . . . . . . . . . . . 12 mesh (1525 micron)

Stainless Steel Screen, reusable

Pump Inlet Size

Fluid Outlet Size

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

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

Sound Data:

Sound Pressure at 3.1 ft (1 m) . . . . . . . . . . . . . . .

1/2 npt(f)

1/4 npsm

80.1 dB(A)

Sound Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.2 dB(A)*

*Measured while spraying with a .017 tip, per ISO 3744

Wetted Parts:

Displacement Pump . . . . . . . Stainless steel, Carbon steel,

PTFE, Aluminum, Polyethylene, Delrin , Leather

NOTE: PTFE and Delrin are trademarks of the Company.

DANGER LABELS

The English language DANGER label shown on page

4 is also on your sprayer. If you have painters who do not read English, order one of the following labels to apply to your sprayer. The drawing below shows the best placement of these labels for good visibility.

Order the labels directly from Graco, free of charge:

1–800–328–0211 Apply other language here

French 185–956

Spanish 185–961

German 186–041

Greek 186–045

Korean 186–049

English 185–953

04653

Dimensions

Model 231–581 Model 231–583

37 lb (17 kg) 50 lb (22.7 kg) Weight

(dry w/o packaging)

Height

Length

Width

19 in. (483 mm) 21 in. (533 mm)

15 in. (381 mm) 22 in. (559 mm)

14 in. (356 mm) 15 in. (381 mm)

Notes

Graco Warranty

Graco warrants all equipment listed in this manual which is manufactured by Graco and bearing its name to be free from defects in material and workmanship on the date of sale by an authorized Graco distributor to the original purchaser for use. With the exception of any special extended or limited warranty published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by Graco to be defective. This warranty applies only when the equipment is installed, operated and maintained in accordance with Graco’s written recommendations.

This warranty does not cover, and Graco shall not be liable for general wear and tear, or any malfunction, damage or wear caused by faulty installation, misapplication, abrasion, corrosion, inadequate or improper maintenance, negligence, accident, tampering, or substitution of non-Graco component parts. Nor shall Graco be liable for malfunction, damage or wear caused by the incompatibility of

Graco equipment with structures, accessories, equipment or materials not supplied by Graco, or the improper design, manufacture, installation, operation or maintenance or structures, accessories, equipment or materials not supplied by Graco.

This warranty is conditioned upon the prepaid return of the equipment claimed to be defective to an authorized Graco distributor for verification of the claimed defect. If the claimed defect is verified, Graco will repair or replace free of charge any defective parts. The equipment will be returned to the original purchaser transportation prepaid. If inspection of the equipment does not disclose any defect in material or workmanship, repairs will be made at a reasonable charge, which charges may include the costs of parts, labor, and transportation.

Graco’s sole obligation and buyer’s sole remedy for any breach of warranty shall be as set forth above. The buyer agrees that no other remedy (including, but not limited to, incidental or consequential damages for lost profits, lost sales, injury to person or property, or any other incidental or consequential loss) shall be available. Any action for breach of warranty must be brought within two (2) years of the date of sale.

GRACO MAKES NO WARRANTY, AND DISCLAIMS ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

A PARTICULAR PURPOSE IN CONNECTION WITH ACCESSORIES, EQUIPMENT, MATERIALS OR COMPONENTS SOLD BUT

NOT MANUFACTURED BY GRACO. These items sold, but not manufactured by Graco (such as electric motors, gas engines, switches, hose, etc.), are subject to the warranty, if any, of their manufacturer. Graco will provide purchaser with reasonable assistance in making any claim for breach of these warranties.

In no event will Graco be liable for indirect, incidental, special or consequential damages resulting from Graco supplying equipment hereunder, or the furnishing, performance, or use of any products or other goods sold hereto, whether due to a breach of contract, breach of warranty, the negligence of Graco, or otherwise.

FOR GRACO CANADA CUSTOMERS

The parties acknowledge that they have required that the present document, as well as all documents, notices and legal proceedings entered into, given or instituted pursuant hereto or relating directly or indirectly hereto, be drawn up in English. Les parties reconnaissent avoir convenu que la rédaction du présente document sera en Anglais, ainsi que tous documents, avis et procédures judiciaires exécutés, donnés ou intentés à la suite de ou en rapport, directement ou indirectement, avec les procédures concernées.

ADDITIONAL WARRANTY COVERAGE

Graco does provide extended warranty and wear warranty for products described in the “Graco Contractor Equipment W arranty

Program”.

All written and visual data contained in this document reflects the latest product information available at the time of publication.

Graco reserves the right to make changes at any time without notice.

Sales Offices: Minneapolis, Detroit, Los Angeles

Foreign Offices: Belgium, Canada, England, Korea, France, Germany, Hong Kong, Japan

GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441

http://www.graco.com

PRINTED IN U.S.A. 308–720 February 1997, Revised May 1998

Graco 308720C ELECTRIC, 120 VAC 455 st Airless Paint Sprayer Owner's Manual

INSTRUCTIONS-PARTS LIST

308–720

Rev. C

Supercedes Rev. B

ELECTRIC, 120 VAC

455

Airless Paint Sprayer

Model 231–581, Series A

Model 231–583, Series A

Related Manuals

GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441

Table of Contents

Symbols

Warning Symbol

Caution Symbol

FIRE AND EXPLOSION HAZARD

INJECTION HAZARD

TOXIC FLUID HAZARD

MOVING PARTS HAZARD

EQUIPMENT MISUSE HAZARD

Component Identification and Function

Setup

Setup

Grounding

Operation

How to use the gun trigger safety

How to use the pressure control.

How to use the pressure drain valve.

Operation

How to use the RAC IV tip guard.

How to remove a tip clog.

Startup

Pressure Relief Procedure

Startup Procedure

Startup

Shutdown and Care

Shutdown and Care

When to Flush

Flushing

How to Flush

Troubleshooting

Motor Test

Setup

Armature Short Circuit Test

Armature, Brushes, and Motor Wiring

Open Circuit Test (Continuity)

General Repair Information

Tool List

Motor Brushes

Motor Brushes

Displacement Pump Repair

Removing the pump

Repairing the pump

Installing the pump

Motor

Motor Start Board

Power Supply Cord

On/Off Switch

Drive Housing, Connecting Rod, Crankshaft

Drive Housing, Connecting Rod, Crankshaft

Pressure Control

Pressure Transducer

Suction Hose

Drain Valve

Repair

Replacement

Notes

Sprayer Parts Drawing

Model 231–581, Series A

Sprayer Parts List

Model 231–581, Series A

Sprayer Parts Drawing

Model 231–583, Series A

Sprayer Parts List

Model 231–583, Series A

Technical Data

Dimensions

Notes

Graco Warranty