Graco 390 Repair Manual

Airless sprayer

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Operation manual (41 pages)

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Page 1 - For portable spray applications of architectural paints and coatings - 3300 psi (22.7MPa, 227bar) Maximum Working Pressure IMPORTANT SAFETY INSTRUCTIONS! Read all warnings and instructions. Save these instructions. Contact Graco Customer Service or your local Graco distributor to obtain a manual in your language. Related Manuals...
Page 2: Table Of Contents
Spin Test ....... . . 16 Graco Information ......30 Fan Replacement .
Page 3: Warnings
Warnings Warnings The following are general warnings related to the safe setup, use, grounding, maintenance, and repair of this equip- ment. Additional, more specific warnings may be found throughout the text of this manual where applicable. WARNING FIRE AND EXPLOSION HAZARD Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode.
Page 4 Check equipment daily. Repair or replace worn or damaged parts immediately. • Do not alter or modify equipment. • Use equipment only for its intended purpose. Call your Graco distributor for information. • Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces. •...
Page 5: Component Identification
Component Identification Component Identification ti5636b Item English Pressure Control ON/OFF switch Pressure Gauge (not on all models) Power Cord Fluid Outlet Prime Valve Cord Wrap Pump Suction Hose Drain Hose Fluid Hose Guard Trigger Safety Lock 310824C...
Page 6: Installation
Installation Installation Grounding and Electric Do not use the sprayer if the electrical cord has a dam- aged ground contact. Only use an extension cord with Requirements an undamaged ground contact. WARNING Your system must be grounded. Read warnings, page Recommended extension cords for use with this The sprayer cord includes: a grounding wire with an sprayer:...
Page 7: Pressure Relief Procedure
Pressure Relief Procedure Pressure Relief Procedure 3. Turn prime valve down. WARNING Follow this Pressure Relief Procedure whenever you are instructed to relieve pressure, stop spraying, check or service equipment or install or clean spray tip. Read Injection Hazard Warning, page 3. 1.
Page 8: General Repair Information
General Repair Information General Repair Information WARNING WARNING Read Electric Shock Warning, page 3 and Burn To reduce risk of serious injury, including electric Hazard Warning, page 4. shock: • Do not touch moving or electric parts with fingers or tools while testing repair. WARNING •...
Page 9: Troubleshooting
Troubleshooting Troubleshooting WARNING Read Electric Shock Warning, page 3, Burn Hazard Warning, page 4 and Pressure Relief Procedure, page 7. What To Check What To Do Problem (If check is OK, go to next check) (When check is not OK, refer to this column) Motor Won’t Operate Basic Fluid Pressure 1.
Page 10 Troubleshooting What To Check What To Do Problem (If check is OK, go to next check) (When check is not OK, refer to this column) Basic Electrical 1. Electric supply. Meter must read Reset building circuit breaker, replace building See wiring diagram, page 100-130 VAC for 110-120 VAC fuses.
Page 11 Troubleshooting What To Check What To Do Problem (If check is OK, go to next check) (When check is not OK, refer to this column) Low Output 1. Worn spray tip. Relieve pressure, page 7. Replace tip. Refer to gun instruction manual, 309639. 2.
Page 12 Troubleshooting What To Check What To Do Problem (If check is OK, go to next check) (When check is not OK, refer to this column) Motor runs and pump 1. Prime Valve Open. Close prime valve. strokes 2. Paint supply. Refill and reprime pump.
Page 13: Displacement Pump Replacement
Displacement Pump Replacement Displacement Pump Replacement See manual 309250 for pump repair instructions. 4. Cycle pump until pin (32) is in position to be removed. Removal 5. Disconnect power cord from outlet. 6. Using a flat screwdriver, push retaining spring (C) WARNING up.
Page 14 3. Install pump pin (32). Verify retainer spring (C) is in groove over pump pin. ti6105a 9. Fill packing nut with Graco TSL until fluid flows onto top of seal. 4. Push pump (9) up until pump threads engage. ti5735a 10.
Page 15: Drive Housing Replacement
Drive Housing Replacement Drive Housing Replacement Installation WARNING 1. Apply a liberal coat of grease to gears and needle bearing surfaces. Install thrust bearing (4) and gears (2) and (3) in front endbell housing. Read Injection Hazard Warning, page 3 and , page Needle bearing surfaces...
Page 16: Spin Test
Spin Test Spin Test See Wiring Diagram, page 27. 2. If uneven or no resistance, check for missing brush caps, broken brush springs, brush leads, and worn brushes. Repair as needed, page 18. WARNING 3. If still uneven or no resistance, replace motor, page Read Electric Shock Warning, page 3 and Pressure Relief Procedure, page 7.
Page 17: Fan Replacement
Fan Replacement Fan Replacement Removal 3. Remove spring clip (101) on back of motor. WARNING 4. Pull off fan (100). Installation Read Electric Shock Warning, page 3 and Pressure 1. Slide new fan (100) in place on back of motor. Be Relief Procedure, page 7.
Page 18: Motor Brush Replacement
Motor Brush Replacement Motor Brush Replacement See Wiring Diagram, page 27. 2. Push each cap (A) into place over brush. Orient each cap with the 2 projections on either side of the brush lead. You will hear a “snap” when cap is Removal securely in place.
Page 19: Control Board Replacement
Control Board Replacement Control Board Replacement See Wiring Diagram, page 27. 6. Pull control board out slightly and then slide it back and off of frame. WARNING Make sure power cord is free and NOT wrapped around cord wrap. Read Electric Shock Warning, page 3 and Pressure 7.
Page 20 Control Board Replacement Installation 1. Position grommet and power cord wires through strain relief in control board (33). ti6122a ti6125a 3. Carefully slide control board back into place on the side of the motor frame. 2. Reconnect the power cord connectors to the correct 4.
Page 21: Fuse Replacement
Fuse Replacement Fuse Replacement Removal Installation 1. Relieve pressure, page 7. Disconnect power cord 1. Replace fuse on control board with spare fuse. from outlet. 2. Install shroud (29) and two screws (30). 2. Remove two screws (30) and shroud (29). 3.
Page 22: Pressure Control Assembly Replacement
Pressure Control Assembly Replacement Pressure Control Assembly Replacement See Wiring Diagram, page 27. WARNING Read Electric Shock Warning, page 3 and Pressure Relief Procedure, page 7. Removal 1. Relieve pressure, page 7. Disconnect power cord from outlet. 2. Remove two screws (30) and shroud (29). ti5766a 3.
Page 23: Manifold Replacement
Manifold Replacement Manifold Replacement Installation See Wiring Diagram, page 27. 1. Position manifold on sprayer frame. WARNING 2. Replace screws (6) and torque to 150 in-lbs (17 N.m). Read Electric Shock Warning, page 3 and Pressure 3. If removed, install pressure control assembly. See Relief Procedure, page 7.
Page 24 Drain Line Replacement Drain Line Replacement This procedure should be used whenever you replace the manifold and reinstall an existing drain line or install a new drain line using the Drain Line Kit. Removal To remove the drain line (40) from the manifold: 1.
Page 25: Power Cord Replacement
Power Cord Replacement Power Cord Replacement Installation See Wiring Diagram, page 27. 1. Follow Control Board Replacement installation instructions, steps 1-4, page 19. WARNING 2. Reconnect, green ground wire (G) to green ground- ing screw (31) on frame. Be sure terminal on ground faces UP or wires could get caught in shroud.
Page 26: Motor Replacement
Motor Replacement Motor Replacement See Wiring Diagram, page 27. 5. Disconnect all leads from board (33) and remove control board. Control Board Replacement, page WARNING 6. Remove ground wire (G) from motor endbell. 7. Remove four screws (6) and motor (1) from frame (45).
Page 27: Wiring Diagram
Wiring Diagram Wiring Diagram 120V Model from Motor Red (+) 2 x Yellow Black (-) Replaceable Fuse Pressure Control Assembly ON/OFF Switch ti5643a Black Capacitor Power White Plug Green Pressure Control 240V Model Assembly from Motor Red (+) 2 x Yellow Capacitor Black (-) Replaceable Fuse...
Page 28: Technical Data
Technical Data Technical Data Power requirements ......100/120V AC, 50/60 hz, 11A, 1 phase 230V AC, 50/60 hz, 7.5A, 1 phase Generator required .
Page 29: Graco Standard Warranty
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.
Page 30: Graco Information
Graco Information TO PLACE AN ORDER, contact your Graco distributor or call to identify the nearest distributor. Phone: 612-623-6921 or Toll Free: 1-800-328-0211 Fax: 612-378-3505 All written and visual data contained in this document reflects the latest product information available at the time of publication.

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Graco 390 Repair Manual

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