Repair FinishPro™ 390/395 Airless/Air-Assisted Sprayer 311911C - For the application of architectural paints and coatings Maximum Fluid Working Pressure: 3300 psi (227 bar, 22.7 MPa) Maximum Air Working Pressure: 35 psi (2.4 bar, 0.24 MPa) IMPORTANT SAFETY INSTRUCTIONS! Read all warnings and instructions. Save these instructions. Contact Graco Customer Service, your local Graco distributor or our website: www.graco.com, to obtain a manual in your language.
Warning Warning The following warnings are for the setup, use, grounding, maintenance and repair of this equipment. The exclamation point symbol alerts you to a general warning and the hazard symbol refers to procedure-specific risks. Refer back to these warnings. Additional, product-specific warnings may be found throughout the body 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.
Warning WARNING EQUIPMENT MISUSE HAZARD Misuse can cause death or serious injury. • Do not exceed the maximum working pressure or temperature rating of the lowest rated system component. Read Technical Data in all equipment manuals. • Use fluids and solvents that are compatible with equipment wetted parts. Read Technical Data in all equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information about your material, request MSDS from distributor or retailer.
Component Identification Component Identification FinishPro 390 21 10 9 13 8 11 7 6 17 18 1 12 4 2 5 3 20 19 ti9018a FinishPro 395 9 8 10 4 7 15 6 12 17 5 11 18 3 14 ti9021a 1 19 4 2 16 20 311911C
Component Identification Component Identification Item 311911C Component 1 Prime/Drain Tube/Hose 2 Air Hose Connection 3 Prime/Spray Valve 4 Fluid Outlet 5 Air/Fluid Supply Hose 6 Displacement Pump 7 Gun (see manual) 8 Filter Manifold 9 Fluid Pressure Control 10 Power/Function Selector 11 Suction Tube 12 Gun Air Regulator 13 Direct Immersion Tube (FinishPro 390 model only) 14 Sprayer Air Pressure Regulator (FinishPro 395 model only) 15 Digital Display (FinishPro 395 model on
Installation Installation Grounding and Electric Requirements Recommended extension cords for use with this sprayer: • 3-wire, 12 AWG (2.5 mm2) minimum, 300 ft. (90 m) maximum length. Smaller gauge or longer extension cords may reduce sprayer performance. The sprayer cord includes a grounding wire with an appropriate grounding contact. Spray gun: ground through connection to a properly grounded fluid hose and pump. Fluid supply container: follow local code.
Pressure Relief Procedure Pressure Relief Procedure General Repair Information Flammable materials spilled on hot, bare, motor could cause fire or explosion. To reduce risk of burns, fire or explosion, do not operate sprayer with cover removed. Follow this Pressure Relief Procedure whenever you are instructed to relieve pressure, stop spraying, check or service equipment or install or clean spray tip. 1. Set function selection switch to OFF and unplug sprayer.
Troubleshooting Troubleshooting Problem What To Check What To Do (If check is OK, go to next check) (When check is not OK, refer to this column) Sprayer Won’t Operate Basic Fluid Pressure Basic Mechanical Basic Air Pressure 8 1. Pressure control knob setting. Motor Slowly increase pressure setting to see if motor will not run if set at minimum (fully starts. counter-clockwise). 2. Spray tip or fluid filter may be clogged. Relieve pressure, page 7. Then clear clog or clean gun filter.
Troubleshooting Problem Basic Electrical See wiring diagram, page 36 What To Check What To Do (If check is OK, go to next check) (When check is not OK, refer to this column) 1. Electric supply. Meter must read Reset building circuit breaker, replace building fuses. 105-130 Vac for 110-120 Vac models Try another outlet. and 210-255 Vac for 230 Vac models. 2. Extension cord. Check extension cord continuity with volt meter. Replace extension cord. Use shorter extension cord. 3.
Troubleshooting Problem Low Fluid Output 10 What To Check What To Do (If check is OK, go to next check) (When check is not OK, refer to this column) 1. Worn spray tip. Relieve pressure, page 7. Replace tip. Refer to gun instruction manual, 311937. 2. Verify pump does not continue to stroke when gun trigger is released. Service pump. See page 13, Displacement Pump Replacement. 3. Prime valve leaking. Relieve pressure, page 7. Then repair prime valve. See page 28, Pressure Control Replacement.
Troubleshooting Problem Motor runs and pump strokes Motor runs but pump does not stroke Motor is hot and runs intermittently Low air output at gun 311911C What To Check What To Do (If check is OK, go to next check) (When check is not OK, refer to this column) 1. Prime Valve Open. Close prime valve. 2. Paint supply. Refill and reprime pump. 3. Intake strainer clogged. Remove and clean, then reinstall. 4. Suction hose leaking air. Tighten nut. Check o-rings on swivel. 5.
Troubleshooting Problem Low air output at gun Air compressor does not run What To Check What To Do (If check is OK, go to next check) (When check is not OK, refer to this column) 4. Damaged (leaking) air supply hose. Replace air supply hose. 5. Air intake filter clogged. Clean or replace air intake filter kit. 6. Mechanical air unloader stuck open. Replace mechanical air unloader. 7. Electrical air unloader stuck open. Replace electrical air unloader. 1.
Displacement Pump Replacement Displacement Pump Replacement 6. Using a flat screwdriver, push retaining spring (C) up. Push out pump pin (32). See manual 309250 for pump repair instructions. Removal C 1. Relieve pressure, page 7. Unplug sprayer from outlet. 2. Loosen two screws (30) and rotate cover (44). 32 TI A 44 30 7. Using a hammer, loosen pump jam nut (11). Unscrew and remove pump (9). ti6140a 3. Loosen nut (A) and remove suction hose (35).
Displacement Pump Replacement Installation 5. Screw in pump until threads are flush with top of drive housing opening. If pump pin works loose, parts could break off due to force of pumping action. Parts could project through air and result in serious injury or property damage. ti6111a CAUTION If the pump jam nut loosens during operation, the threads of the drive housing will be damaged. 6. Align pump outlet (E) to back. 1. Extend pump piston rod full.
Drive Housing Replacement Drive Housing Replacement Installation 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. Removal Needle Bearing Surfaces 3 1. Relieve pressure, page 7. 4 2. Remove pump (9). Displacement Pump Replacement, page 13. 3. Disconnect power cord from outlet. 3 ti8329b 5 7 6 32 2 2. Push drive housing into front endbell housing.
Spin Test Spin Test Armature, Brushes, and Motor Wiring Open Circuit Test (Continuity) See Wiring Diagram, page 36. 1. Connect red and black motor leads with test lead. Turn motor fan by hand at about two revolutions per second. 2. If uneven or no resistance, check for missing brush caps, broken brush springs, brush leads, and worn brushes. Repair as needed, page 18. To check armature, motor winding and brush electrical continuity: 1. Relieve pressure, page 7. Disconnect power cord from outlet. 3.
Fan Replacement Fan Replacement 3. Remove spring clip (1b) on back of motor. 4. Pull off fan (100). Installation FinishPro 390 1. Slide new fan (1a) in place on back of motor. Be sure blades of fan face motor as shown. Removal 2. Install spring clip (1b). 1. Relieve pressure, page 7. Disconnect power cord from outlet. 3. Replace shroud (29) and two screws (30). 2. Remove two screws (30) and shroud (29). 1a 1b 30 29 ti9269a FinishPro 395 1. Relieve pressure, page 7.
Motor Brush Replacement Motor Brush Replacement See Wiring Diagram, page 36. FinishPro 390 Removal Replace brushes worn to less than 1/4 in. (6mm). Brushes wear differently on each side of motor, check both sides. 1. Relieve pressure, page 7. Disconnect power cord from outlet. 2. Remove two screws (30) and shroud (29) (see illustration on page 16). 3. Disconnect motor connector (D) from control board (33). 2. Push each cap (A) into place over brush.
Motor Brush Replacement Motor Brush Replacement FinishPro 395 6. Inspect commutator for excessive pitting, burning, or gouging. A black color on commutator is normal. Have commutator resurfaced by a motor repair shop if brushes wear too fast. Removal Replace brushes worn to less than 1/2 in. Brushes wear differently on each side of motor, check both sides. Brush Repair Kit 287735 is available. Installation CAUTION When installing brushes, follow all steps carefully to avoid damaging parts. 1.
Control Board Replacement Control Board Replacement 6. Pull control board out slightly and then slide it back and off of frame. See Wiring Diagram, page 36. Make sure power cord is free and not wrapped around cord wrap. FinishPro 390 7. Remove grommet and wires from strain relief. Removal . Ground wire will remain attached to sprayer with grounding screw. 1. Relieve pressure, page 7. Disconnect power cord from outlet. 2. Remove two screws (30) and shroud (29) (see illustration, page16). 3.
Control Board Replacement Installation 1. Position grommet and power cord wires through strain relief in control board (33). A B B Strain Relief A 33 33 33 240V 120V ti6143b Grommet ti6122a 2. Connect the power cord connectors to the correct terminals indicated on the control board (120V, black and white, 240V, blue and brown) on control board (33). 5. Attach motor connector (B) and pressure control assembly connector (A). 6. Install shroud (29) and two screws (30) (see illustration, page 16).
Control Board Replacement FinishPro 395 Installation See Wiring Diagram, page 36. 1. Clean pad on rear of motor control board (49). Apply small amount of thermal compound to pad. 2. Install motor control board with screws (6). Removal 3. Connect all leads to motor control board. 1. Relieve pressure, page 7. Disconnect power cord from outlet. 4. Bundle and tie all loose wires so none are in contact with inductor coil. 2. Remove four screws (12) and cover (50). 5.
On/Off Switch Replacement On/Off Switch Replacement See Wiring Diagram, page 36. 3. Disconnect three wires (A) from ON/OFF switch (58). 4. Remove toggle boot/nut (30). 5. Remove two yellow wires (B) from ON/OFF switch. Remove ON/OFF switch. FinishPro 395 Installation 1. Relieve pressure, page 7. 1. Connect two yellow wires (B) to ON/OFF switch (58) 2. Remove four screws (12) and pressure control cover (50). 2. Install new ON/OFF switch (58). Install toggle boot/nut (30).
On/Off Switch Replacement 3. Disconnect three wires (A) from ON/OFF switch (58). 4. Remove toggle boot/nut (30). Remove ON/OFF switch (58). FinishPro 390 Installation Removal 1. Install new ON/OFF switch (58). Install toggle boot/nut (30). 1. Relieve pressure, page 7. 2. Connect three wires (A) to ON/OFF switch (58). 2. Remove four screws (12) and switch box cover (50). 3. Install switch box cover (50) with four screws (12).
Fuse Replacement Fuse Replacement 3. Remove fuse from control board. 4. Remove spare fuse from motor. FinishPro 390 only Removal 1. Relieve pressure, page 7. Disconnect power cord from outlet. Installation 1. Replace fuse on control board with spare fuse. 2. Install shroud (29) and two screws (30) (see illustration, page 16). 2. Remove two screws (30) and shroud (29) (see illustration, page 16).
Removing and Installing Air Filter Removing and Installing Air Filter Removal 1. Relieve pressure, page 7. Disconnect power cord from outlet. 2. FinishPro 390: Unscrew filter (D) from back of sprayer. Install new filter from Compressor Filter Kit 288724. D ti9266a FinishPro 395: a. Remove four screws (12) from back louvered cover (64). b. Unscrew filter (D) from back of sprayer. Install new filter from Compressor Filter Kit 288724. c. Install back cover (64) with four screws (12).
Compressor Replacement and Repair Compressor Replacement and Repair • To repair compressor, use Compressor Service Kit 288723. Refer to Thomas Compressor manual provided. • Replace compressor piston assembly, use Kit 288723. 4. Disconnect electrical connection from solenoid valve. Removing Compressor from Sprayer 1. Relieve pressure, page 7. Disconnect power cord from outlet. 2. Remove front and back louvers from sprayer. ti9265a 5. Remove compressor from sprayer.
Pressure Control Replacement: FinishPro 390 Pressure Control Replacement: FinishPro 390 See Wiring Diagram, page 36. Removal 1. Relieve pressure, page 7. Disconnect power cord from outlet. 2. Remove two screws (30) and shroud (29) (see illustration, page 16). 3. Disconnect pressure switch connector (A) from control board (33). 4. Remove tape (22) holding wires to manifold.
Pressure Control Replacement: FinishPro 390 Motor Control Board Diagnostics: FinishPro 395 CAUTION Do not allow sprayer to develop fluid pressure without transducer installed. Leave drain valve open if test transducer is used. • • Keep new transducer on hand for use for test. Refer to Digital Display Messages, page 30. 1. Relieve pressure, page 7 and unplug sprayer. 2. Remove screws and cover. 3. Turn ON/OFF switch, ON. 4.
Pressure Control Replacement: FinishPro 390 Digital Display Messages: FinishPro 395 • Display Sprayer Operation No display does not mean the sprayer is not pressurized. Relieve pressure before repair. Indicates What To Do No Display Sprayer stops. Power is not applied. Sprayer may be pressurized. Loss of power. Check power source. Relieve pressure before repair or disassembly. 3000 psi 210 bar 21 MPa Sprayer is pressurized. Power is applied.
Pressure Control Replacement: FinishPro 390 Pressure Adjust Potentiometer: FinishPro 395 6. Turn sprayer OFF and then ON to leave in stored data mode. Data Point Definition 1 Number of hours power switch has been ON with power applied 2 Number of hours motor has been running Removal 3 Last error code. Press and hold display button to clear error code to E=00 1. Relieve pressure, page 7. Unplug sprayer. 4 Software revision 2. Remove screws and cover. 3.
Drain Valve Replacement Drain Valve Replacement Installation Before installing new drain valve, be sure old gasket (23a) and seat (23b) are not still inside manifold. Removal 1. Relieve pressure, page 7. Disconnect power cord from outlet. 1. Thread drain valve (23) into manifold (15) opening. 2. Using a punch and hammer, tap pin (26) out of drain handle (25). 2. Hand tighten securely. Using a wrench, torque to 120 to 130 in-lb. 3. Pull drain handle (25) and base (24) off drain valve (23). 3.
Drain Line Removal/Replacement Drain Line Removal/Replacement FinishPro 390 Removal Installation To remove the drain line (40) from the manifold: 1. Screw barbed fitting (20) into manifold. 1. Cut drain line (40) from barbed fitting (20). 2. Push drain line (40) onto barbed fitting (20). To make the drain line more pliable and easier to install on barbed fitting, heat drain line (40) end with a hair dryer or place end in hot water a few seconds. 2. Unscrew barbed fitting (20) from manifold.
Motor Replacement Motor Replacement 6. Remove ground wire (G) from motor endbell. See Wiring Diagram, page 36. 7. Remove four screws (6) and motor (1) from frame (45). CAUTION Do not drop gear cluster (3) and (2) when removing drive housing (5). Gear cluster may stay engaged in motor frontend bell or drive housing. Installation 1. Install new motor (1) on frame (45) with four screws (6). 2. Install manifold (15) with two screws (6). FinishPro 390 3. Install control board (33) with three screws (30).
Motor Replacement Motor Replacement 6. Remove screws (47) and control box (48). See Wiring Diagram, page 36. 7. Remove screws (47) and manifold (15). 8. Remove screws (47) and motor (54) from frame (59). FinishPro 395 Installation CAUTION Do not drop gear cluster (44) and (40) when removing from drive housing (42). Gear cluster may stay engaged in motor front end bell or drive housing. 1. Install new motor (54) on frame (59) with screws (47). 2. Install manifold (15) with screws (47). Removal 3.
Wiring Diagram Wiring Diagram FinishPro 395 120 Vac ti9741a FinishPro 390 120 Vac From Motor 2X Yellow Red (+) Black (-) Replaceable Fuse Pressure Control Assembly Capacitor Black Green ON/OFF Switch White Power Plug To Compressor ti9722a 36 311911C
Wiring Diagram FinishPro 390 240 Vac From Motor Capacitor Red (+) Pressure Control Assembly 2X Yellow Black (-) Replaceable Fuse ON/OFF Switch To Compressor Power Plug 311911C 37
Wiring Diagram Notes 38 311911C
Technical Data Technical Data FinishPro 390 Models FinishPro 395 Models Power requirements 120 Vac, 50/60 Hz, 15A, 230 Vac, 50/60 Hz, 10A, 120 Vac, 50/60 Hz, 15A, 230 Vac, 50/60 Hz, 10A, 1 phase 1 phase 1 phase 1 phase Max tip size 0.020 0.021 0.021 0.023 Max material output gpm (lpm) .43 gpm (1.6 lpm) .47 gpm (1.8 lpm) .47 gpm (1.8 lpm) .54 gpm (2.
Warranty Warranty Graco warrants all equipment referenced in this document which is manufactured by Graco and bearing its name to be free from defects in material and workmanship on the date of sale 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.
