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OWNER’S MANUAL

308–031

Rev C

Supersedes Rev A

 

and PCN C

(and Rev B, not published)

PRO 501

 Airless Paint Sprayer

 1/2 GPM, Electric

Model 224–605, Series A

2750 psi (190 bar) MAXIMUM WORKING PRESSURE

TABLE OF CONTENTS

Warnings

2

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

Setup

8

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

Startup

9

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

Maintenance

11

. . . . . . . . . . . . . . . . . 

Flushing Guidelines

12

. . . . . . . . . . . 

Application Techniques

13

. . . . . . . . 

Troubleshooting Guide

14

. . . . . . . . 

Repair

16

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

Parts

24

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

Accessories

31

. . . . . . . . . . . . . . . . . 

Technical Data

31

. . . . . . . . . . . . . . . 

Warranty

32

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

THE O’BRIEN CORPORATION, 450 E. Grand Avenue, So. San Francisco, CA 94080

COPYRIGHT 1990, GRACO INC.

This manual contains IMPORTANT
INSTRUCTIONS and WARNINGS.
READ AND RETAIN FOR REFERENCE.

0893

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 trig-
gering 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.

FIRE AND

EXPLOSION HAZARD

SKIN INJECTION

HAZARD

READ AND UNDERSTAND ALL LABELS AND INSTRUCTION MANUALS BEFORE USE

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

Use  outdoors or in extremely well ventilated areas. Ground equip-
ment, 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 ciga-
rettes,  arcs from connecting or disconnecting power cords or turn-
ing light switches on and off.

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

NOTE: This is an example of the DANGER label on your sprayer. 

This label is available in other languages, free of charge. 
See page 28 to order.

Summary of Contents for 224-605

Page 1: ...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 resul...

Page 2: ...e risk of fluid injection when the tip is not installed Check diffuser operation regularly Follow the PRESSURE RELIEF PROCEDURE be low then remove the spray tip Aim the gun into a metal pail holding t...

Page 3: ...heck the electrical resistance of your fluid hoses at least once a week If your hose does not have a tag on it which specifies the maximum electrical resis tance contact the hose supplier or manufactu...

Page 4: ...ccidentellement Diffuseur Le diffuseur du pistolet sert diviser le jet et r duire les ris ques d injection accidentelle quand l ajutage n est pas en pla ce V rifier le fonctionnement du diffuseur r gu...

Page 5: ...ans mise la terre ou avec une mise la terre in correcte peut entra ner des risques pour votre syst me Lisez aussi LES RISQUES D INCENDIE OU D EXPLOSION RISQUES D INCENDIE OU D EXPLOSION De l lectricit...

Page 6: ...ola inoperante El no hacerlo puede llevar al disparo imprevisto de la pistola Difusor El difusor de la pistola dispersa el chorro pulverizado y reduce el riesgo de inyecci n cuando no est instalada la...

Page 7: ...a sin puesta a tierra o con la puesta a tierra en malas condiciones Leer tambi n la informaci n sobre RIESGO DE INCENDIO O EXPLOSION m s arriba PELIGRO DE INCENDIO O EXPLOSION El flujo a alta velocida...

Page 8: ...n and main spray hose DO NOT use thread sealant on the hose and gun connections DO NOT install the spray tip until the system is primed 2 Fill the packing nut wet cup 1 3 full with Throat Seal Liquid...

Page 9: ...ips and or stop the sprayer 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 the sid...

Page 10: ...er turn the ON OFF switch to ON and slowly increase the pressure until the sprayer starts Keep the gun triggered until all air is forced out of the system and the paint flows freely from the gun Relea...

Page 11: ...relieve pressure Loosen the tip guard re taining nut slowly to relieve any additional pressure and then remove the spray tip to clean it See the instructions supplied with your spray tip for cleaning...

Page 12: ...bowl only to flush it Close the pressure drain valve See Fig 6 3 Pour one half gallon 2 liters of compatible solvent into a grounded metal pail Put the suction tube in the pail 4 Remove the spray tip...

Page 13: ...attern depends on the fan pat tern of the tip you choose Do not try to increase coverage by increasing the fluid pressure Use the lowest pressure needed for good results This prolongs the life of your...

Page 14: ...ressure control frozen or damaged by over pressurization Try to thaw2 or replace pressure control Electric motor stops while spraying Power cord or extension cord unplugged or damaged or building circ...

Page 15: ...runs or sags Spray tip to big or worn Change the spray tip Spitting from gun Air in fluid pump or hose Check for loose connections at pump intake and tighten Then prime the pump Spray tip is partiall...

Page 16: ...sing 8 un til it stops at the locknut 31 Unscrew the pump until the outlet fitting 30 faces straight back 4 Torque the locknut 31 to 70 ft lb 95 N m 5 Reassemble the remaining parts in the re verse or...

Page 17: ...NST ROD TO 19 ft lb 25 N m 223 DO NOT ALLOW THIS NUT TO MOVE RELATIVE TO THE PISTON 224 WHEN INSTALLING PISTON ONTO ROD 0083 4 Torque the nut 214 against the rod 223 to 19 ft lb 25 N m Use two wrenche...

Page 18: ...nduit 13f while carefully guiding the leads through the bushing 305 one at a time 6 Remove the mounting bracket 70 and fittings 96 90 30 and the filter 89 Install these parts on the new pressure contr...

Page 19: ...the sprayer at higher pressures may result in component rupture fire or explosion To per form this adjustment however the sprayer pressure must be temporarily increased above the normal working press...

Page 20: ...hole C and loos en the adjustment nut B 1 8 turn or less Re peat steps 5 and 6 If the pressure is higher than 2750 psi 190 bar Unplug the sprayer and relieve pressure In sert the wrench through the ho...

Page 21: ...luding the needle bearing C Replace both parts if either is worn or damaged 7 Clean the mating surfaces of the bearing and drive housings To extend the service life of the connecting rod bearing lubri...

Page 22: ...d connecting rod assembly A off the crankshaft B 4 Remove the screws 8b 49 and pull the drive housing C off the motor housing D 5 Remove the screws 8c and pull the motor housing D off the motor 6 Clea...

Page 23: ...o avoid loosening the terminals 5 Remove the motor mounting screws 38 See Fig 20 Lift the motor off the frame and care fully guide the wires through the pressure con trol connector 305 Remove the cond...

Page 24: ...cement see parts on page 27 1 30 162 453 NIPPLE 1 4 18 npsm m x 1 4 18 npt m 3 31 176 762 NUT hex 1 1 2 18 1 32 108 982 CONNECTOR tube 1 34 110 884 SCREW pnh 10 24 x 1 2 4 35 221 077 PRESSURE DRAIN VA...

Page 25: ...BEL OTHER SIDE DANGER LABEL 23 13c 45 41 36 25 27 37 37 12 81 11 39 40 26 31 28 64 51 50 8a 8b 80 85 ID LABEL 38 48 49 8 24 13f 13g 13 13a 8c 8d 34 32 Ref 41 Ref 26 35 18 4 7 70 16 65 63 DANGER LABEL...

Page 26: ...REF NO PART NO DESCRIPTION QTY REF NO PART NO DESCRIPTION QTY 303 218 916 TRIAC 1 304 180 962 LABEL 1 305 102 932 CONNECTOR conduit 90_ 1 306 217 492 CORD power supply 1 307 217 012 BARE PRESSURE CONT...

Page 27: ...GUIDE ball sst 1 216 177 929 CYLINDER alloy steel 1 217 176 882 V PACKING polyethylene 3 218 176 997 V PACKING polyethylene 3 219 186 652 WASHER backup aluminum 1 220 180 073 GLAND female plated stee...

Page 28: ...S 3300 psi 231 bar Max Working Pressure coupled 1 4 npsm f spring guards on both ends 223 541 1 4 ID 50 ft 15 m 214 701 3 16 ID 3 ft 0 9 m FLUID FILTER KIT 223 857 Includes a fluid filter and all nece...

Page 29: ...29 NOTES...

Page 30: ...new models Part Status Ref No Part No Name Old New 25 25 181 073 187 146 Strainer Strainer Delete Add 70 70 185 525 185 524 Bracket Bracket Delete 89 106 228 Tee Add Add Add Add Add Add Add Add 89 89a...

Page 31: ...c plated steel Delrinr Leather Filter Aluminum Carbon Steel Stainless Steel Fluid Inlet 3 4 npt m with 30_ ID chamfer Fluid Outlet Size 1 4 npsm m Dimensions Weight 85 lb 38 Kg Height 20 in 508 mm Len...

Page 32: ...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 i...

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