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Repair
Electric Airless Sprayer
- For the application of architectural paints and coatings -
Model 278680
3300 psi (22.7 MPa, 227 bar) Maximum Working Pressure
Important Safety Instructions
Read all warnings and instructions in this
manual. Save these instructions.
- For professional use only -
332257A
ti21026a
EN
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Table of Contents
Related Manuals for Graco 278680
Summary of Contents for Graco 278680
- Page 1 Electric Airless Sprayer - For the application of architectural paints and coatings - - For professional use only - Model 278680 3300 psi (22.7 MPa, 227 bar) Maximum Working Pressure Important Safety Instructions Read all warnings and instructions in this manual.
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Page 2: Table Of Contents
Installation ......18 Graco Standard Warranty ....28 ON/OFF Switch/Power Cord Board Kit . -
Page 3: Warnings
All parts of the spray system, including the pump, hose assembly, spray gun, and objects in and around the spray area shall be properly grounded to protect against static discharge and sparks. Use Graco conductive or grounded high-pres- sure airless paint sprayer hoses. - Page 4 Warnings WARNING WARNING WARNING WARNING SKIN INJECTION HAZARD High-pressure fluid from gun, hose leaks, or ruptured components will pierce skin. This may look like just a cut, but it is a serious injury that can result in amputation. Get immediate surgical treatment. •...
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Page 5: Component Identification
Component Identification Component Identification ti21027a Drain tube Pressure control Pump Power Cord Hose ON/OFF switch Spray Gun Digital Display Switch Tip Prime/Spray valve Tip Guard Filter Trigger lock Fluid outlet Serial Tag Siphon tube 332257A... -
Page 6: Grounding
Grounding Grounding The equipment must be grounded to reduce the risk The plug must be plugged into an outlet that is prop- of static sparking. Static sparking can cause fumes to erly installed and grounded in accordance with all ignite or explode. Grounding provides an escape wire local codes and ordinances. -
Page 7: Pails
Grounding Pails Solvent and oil/based fluids: follow local code. Use To maintain grounding continuity when flushing or only conductive metal pails, placed on a grounded sur- relieving pressure: hold metal part of spray gun firmly face. Do not place the pail on a nonconductive surface, to side of a grounded metal pail. -
Page 8: Pressure Relief Procedure
Pressure Relief Procedure Pressure Relief Procedure Follow the Pressure Relief Procedure whenever 2. Turn pressure to lowest setting. Trigger gun to you see this symbol. relieve pressure. Turn prime valve down. ti2719a This equipment stays pressurized until pressure is ti21028a manually relieved. -
Page 9: General Repair Information
General Repair Information General Repair Information • Install motor shroud before operation of sprayer and replace if damaged. Motor shroud directs cooling air around motor to prevent overheating. It can reduce risk of burns, fire or explosion, or cut fingers. Flammable materials spilled on hot, bare motor could cause fire or explosion. -
Page 10: Troubleshooting
Troubleshooting Troubleshooting What to Do What to Check (When check is not OK, refer to this Type of Problem (if check is OK, go to next) column) Basic fluid pressure problems Pressure control knob setting. Motor Slowly increase pressure to see if will not run if at minimum setting (fully motor starts. - Page 11 Troubleshooting What to Do (When check is not OK, refer to this What to Check Type of Problem (if check is OK, go to next) column) Basic Electrical Problems Electric supply. Meter must read: Reset building circuit breaker. Replace building fuse. Try another •...
- Page 12 Troubleshooting What to Do (When check is not OK, refer to this What to Check Type of Problem (if check is OK, go to next) column) Low Output For worn spray tip. Relieve pressure, page 8. Then replace tip. See your separate gun manual for additional instruction.
- Page 13 Troubleshooting What to Do (When check is not OK, refer to this What to Check Type of Problem (if check is OK, go to next) column) Motor runs and pump strokes Low paint supply. Refill and reprime pump. Intake strainer clogged. Remove and clean, then reinstall.
- Page 14 Troubleshooting What to Do (When check is not OK, refer to this What to Check Type of Problem (if check is OK, go to next) column) Building circuit breaker opens as All electrical wiring for damaged Repair or replace any damaged soon as sprayer switch is turned on insulation and all terminals for loose wiring or terminals.
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Page 15: Displacement Pump Replacement
Displacement Pump Replacement Displacement Pump Replacement See manual 309250 for pump repair instructions. 5. Using a flat screwdriver, push retaining spring (31) up. Push out pump pin (32). Removal 1. Cycle motor until pump pin (32)is in position to be removed. -
Page 16: Installation
8. Install suction tube (60) and high pressure hose (45). Tighten fittings. ti21096a ti21094a 9. Fill packing nut with Graco TSL until fluid flows onto 3. Install pump pin (32). Slide retainer spring (31) top of seal. down into groove over pump pin. -
Page 17: Drive Housing Replacement
Drive Housing Replacement Drive Housing Replacement 1. Perform Pressure Relief Procedure, page 8. NOTICE 2. Remove pump (41), Displacement Pump Do not drop gear cluster (44) and (40) when removing Replacement, page 15. from drive housing (42). Gear cluster may stay engaged in motor front end bell or drive housing. -
Page 18: Fan Replacement
Fan Replacement Fan Replacement Removal Installation 1. Slide new fan (125) in place on back of motor. Be sure blades of fan face motor as shown. 2. Tighten screw (126). Torque to 1 - 1.2 N•m. 1. Perform Pressure Relief Procedure, page 8. 3. -
Page 19: On/Off Switch/Power Cord Board Kit
ON/OFF Switch/Power Cord Board Kit ON/OFF Switch/Power Cord Board Kit Removal 8. Disconnect black and blue leads between control boards. 9. Remove switch board from box. Installation 1. Reconnect black and blue leads between control 1. Perform Pressure Relief Procedure, page 8. and switch boards. -
Page 20: Motor Control Board
Motor Control Board Motor Control Board Installation 1. Connect motor control enclosure to transducer (38) and tighten two screws (47). 2. Route power cord through strain relief and connect NOTE: See Wiring Diagram, page 24. brown and blue cord leads to control board. Install and tighten ground screw (6). -
Page 21: Motor Control Diagnostics
Motor Control Diagnostics Motor Control Diagnostics NOTICE Do not allow sprayer to develop fluid pressure without transducer installed. Leave drain valve open if test transducer is used. NOTE: • Keep a new transducer on hand to use for test. 1. For sprayers with digital display, see Digital Display •... -
Page 22: Pressure Control Transducer
Pressure Control Transducer Pressure Control Transducer Pressure Adjust Potentiometer Removal Removal 1. Perform Pressure Relief Procedure, page 8. 1. Perform Pressure Relief Procedure, page 8. Unplug power cord. Unplug power cord. 2. Remove screws (12) and cover (51). 2. Remove screws (12) from cover (51). 3. -
Page 23: Motor Replacement
Motor Replacement Motor Replacement Remove screws (47) and control box (48). Remove two screws (12) and remove shroud bracket (117). NOTICE 10. Remove screws (47) and motor (54) from frame (59). Do not drop gear cluster (44) and (40) when removing from drive housing (42). -
Page 24: Wiring Diagram
Wiring Diagram Wiring Diagram MOTOR DIGITAL DISPLAY POTENTIOMETER BLUE BROWN ON/OFF TRANSDUCER SWITCH POWER PLUG GREEN BLACK ti21098a BLUE 332257A... -
Page 25: Notes
Notes Notes 332257A... -
Page 26: Notes
Notes Notes 332257A... -
Page 27: Notes
Notes Notes 332257A... -
Page 28: 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.