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  3. Paint Sprayer
  4. PRO 301
  5. Owner's Manual

O'Brien PRO 301 Owner's Manual

Manual is about: Airless

Summary of PRO 301

  • Page 1

    Owner’s manual 308–030 rev a pro 301 airless paint sprayer 1/3 gpm, electric model 223–636, series a 2500 psi (172 bar) maximum working pressure table of contents warnings 2 . . . . . . . . . . . . . . . . . . . . . Setup 8 . . . . . . . . . . . . . . . . . . . . . . . . Startup 10 . . . . . . . . ....

  • Page 2: Warnings

    1,4,5 2 3 4 6 308–030 warnings high pressure spray can cause serious injury. For professional use only. Observe all warnings. Read and understand all instruction manuals before operating the equipment. Fluid injection hazard general safety this equipment generates very high fluid pressure. Spray fro...

  • Page 3

    3 308–030 moving parts hazard moving parts can pinch or amputate your fingers or other body parts. Keep clear of moving parts when starting or operat- ing the sprayer. Follow the pressure relief procedure on page 2 before checking or servicing any part of the sprayer, to prevent it from starting acc...

  • Page 4: Avertissement

    4 308–030 avertissement la pulvérisation à haute pression peut causer de blessures très graves. Réservé exclusivement à l’usage professionnel. Observer toutes les consignes de sécurité. Bien lire et bien comprendre tous les manuels d’instructions avant d’utiliser le matériel. Risques d’injection con...

  • Page 5

    5 308–030 risques en cas de mauvaise utilisation du material consignes générales de sécurité toute utilisation anormale de l’appareil du pulvérisation ou des accessoires comme, par exemple, la mise sous une pression excessive, les modifications de pièces, l’utilisation de produits chimiques et de ma...

  • Page 6: Advertencia

    6 308–030 advertencia el rociado a alta presion puede causar graves lesiones. Solo para uso profesional. Respecte los avisos de advertencia. Lea y entienda todo el manual de instrucciones antes de manejar el equipo. Peligro de inyeccion de fluido seguridad general este equipo general un fluido a una...

  • Page 7

    7 308–030 peligro por mal uso del equipo seguridad general cualquier mal uso del equipo pulverizador o los accesorios, tal como sobre presurización, modificación de piezas, uso de materiales y productos químicos incompatibles, o utilización de piezas dañadas o desgastadas, puede hacen que se rompan ...

  • Page 8

    8 308–030 setup to reduce the risk of serious bodily injury caused by static sparking, fluid injection or over–pressurization and rupture of the hose or gun: 1. Ground the sprayer and all objects being sprayed. Read fire or explosion hazard on page 3. 2. Do not operate the spray gun without a tip gu...

  • Page 9

    Pump hose rack on/off switch pressure control knob pressure drain valve 1/4 npsm(m) fluid outlet do not install a shut off device here fig 1 strainer suction tube packing nut/ wetcup keep filled with tsl 9 308–030 setup operation pressure relief procedure to reduce the risk of serious bodily injury,...

  • Page 10

    10 308–030 operation 1. Prime the sprayer with paint. A. Close the pressure drain valve. B. Don’t install the spray tip yet! C. Put the suction tube into the paint. D. Turn the pressure adjusting knob counter- clockwise to lower the pressure. E. Disengage the gun safety latch. F. Hold a metal part o...

  • Page 11

    11 308–030 operation 3. Adjusting the spray pattern (see fig 4.) a. Increase the pressure just until spray from the gun is completely atomized. To avoid excessive overspray and fogging, to decrease tip wear and to extend the life of the sprayer, use the lowest pressure needed for good atomization. B...

  • Page 12

    12 308–030 flushing guidelines when to flush never leave water in the sprayer if there is the slightest chance it could freeze. Flush out the water with mineral spirits. If water freezes in the pressure control tube, it prevents the sprayer from being started and causes seri- ous damage to the press...

  • Page 13

    13 308–030 application methods hold the gun perpendicular to the surface. Keep the gun at an even 12 to 14 in. (300–356 mm) from the surface you are spraying. See fig 8. Begin moving the gun horizontally at a steady rate. Start the spray stroke off the target surface and pull the trigger as the gun ...

  • Page 14

    14 308–030 troubleshooting guide warning pressure relief procedure to reduce the risk of serious bodily injury, including fluid injection, splashing in the eyes or on the skin, or injury from moving parts, always follow this proce- dure when you shut off the sprayer, when checking, adjusting or clea...

  • Page 15

    15 308–030 problem cause solution paint leaks into wet–cup throat packings are worn or damaged replace the packings. See page 16. Excessive surging from spray gun spray tip or fluid filter is plugged disassemble and clean. Spray tip too big or worn change the spray tip. Paint too viscous thin the pa...

  • Page 16

    16 308–030 displacement pump to reduce the risk of serious bodily injury,fol- low the pressure relief procedure warning on page 14 before checking or repairing any part of the spray system. Warning removing the pump. See fig 11. Note: refer to fig 11 for this procedure. 1. Flush the sprayer. Relieve...

  • Page 17

    17 308–030 displacement pump reassembly procedure 1. Stack the backup washer (219*), u–cup seal (205*) lips down, and female gland (220*), al- ternate the polyethylene and leather v–pack- ings (217*, 218*) lips up, and stack the male gland (213*) onto the piston valve (224). See fig 14. 2. Tighten t...

  • Page 18

    18 308–030 pressure control & circuit board to reduce the risk of serious bodily injury, al- ways follow the pressure relief procedure warning on page 14 before checking or re- pairing any part of the spray system. Warning note: refer to fig 15 and 16. Note: a circuit board (13b) is not included wit...

  • Page 19

    19 308–030 pressure control adjustment use extreme caution when performing this adjustment procedure to reduce the risk of a fluid injection injury or other serious bodily injury, which can result from component rup- ture, electric shock, fire, explosion or moving parts. This procedure sets the spra...

  • Page 20

    20 308–030 pressure control adjustment 1. Relieve pressure. See page 14. 2. Remove the old spray hose. Install the new hardware and hose as shown in fig 17. On the other end of the hose install the needle valve. Note: refer to fig 18 for the remainder of this procedure. Fig 18 on/off switch a b c 3....

  • Page 21

    21 308–030 connecting rod and bearing housing to reduce the risk of serious bodily injury, al- ways follow the pressure relief procedure warning on page 14 before checking or re- pairing any part of the spray system. Warning note: refer to fig 19. 1. Remove the sprayer’s shroud and the lift han- dle...

  • Page 22

    308–030 drive housing to reduce the risk of serious bodily injury, al- ways follow the pressure relief procedure warning on page 14 before checking or re- pairing any part of the spray system. Warning note: refer to fig 20 for this procedure. 1. Remove the sprayer’s shroud and the lift han- dle (2)....

  • Page 23

    23 308–030 motor & capacitor to reduce the risk of serious bodily injury, al- ways follow the pressure relief procedure warning on page 14 before checking or re- pairing any part of the spray system. Warning note: refer to fig 20 except where noted. 1. Remove the sprayer’s shroud and the lift han- d...

  • Page 24

    24 308–030 parts list pro 301 sprayer model 223–636, series a includes items listed below ref no. Part no. Description qty ref no. Part no. Description qty 1 110–886 screw, mach; pnh; type f; 6–32 unc–3a x 0.375” 6 2 223–802 lift handle 1 3 110–847 bushing, snap 1 4 110–885 screw; mach; pnh, cross r...

  • Page 25

    25 308–030 parts drawing detail pro 301 sprayer model 223–636, series a see detail below 15 2 1 82 5 65 63 29 30 61 60 68 66 87 id label, this side 86 id label, other side danger label 23 3 13c 45 41 36 25 27 37 37 12 81 11 88 39 40 26 31 28 64 51 50 8a 8b 80 85 id label 84 38 48 49 8 24 13f 13g 13 ...

  • Page 26

    26 308–030 parts drawing – pressure control ref 16 part no. 215–860 ref no. 18 pressure control assembly includes replaceable items listed below ref 13c 13b 306 ref 90 ref 89 ref 30 ref 4 312 ref 30 309 ref 13f 308 91 307a 307b 314 313 307 316 317 13e 13d 303 refer to page 24 for the parts numbers o...

  • Page 27

    27 308–030 displacement pump parts drawing and list ref no. Part no. Description qty 201 180–656 plug 1 203 105–444* ball, sst; 0.3125” dia. 1 204 105–445* ball, sst; 0.5” dia. 1 205 105–522* seal, u–cup, polyurethane 1 206 176–761* gasket, brass 1 207 176–759* pin, ball stop 1 208 176–749* v–packin...

  • Page 28

    28 308–030 accessories must be purchased separately french 185–955 spanish 185–962 german 186–042 greek 186–046 korean 186–050 english 185–954 apply other language in this area on other side of shroud danger labels the english language danger label shown on page 1 is also on your sprayer. If you hav...

  • Page 29

    29 308–030 notes.

  • Page 30

    30 308–030 notes.

  • Page 31

    31 308–030 technical data electric motor 0.5 hp, 1725 rpm, 115v, 60hzac, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single phase with automatic thermal overload switch. Ul listed electric cord no. 14 gauge, 3 wire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

  • Page 32

    32 308–030 the graco warranty and disclaimers warranty graco warrants all equipment manufactured by it and bearing its name to be free from defects in material and workman- ship on the date of sale by an authorized graco distributor to the original purchaser for use. As purchaser’s sole remedy for b...