Graco Express 3900 Operation
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Graco Express 3900 Operation

Graco Express 3900 Operation

Airless sprayer
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Operation
Express 3900
Airless Sprayer
For professional use only.
Not approved for use in explosive atmospheres or hazardous locations.
For portable airless spraying of architectural coatings and paints.
3000 psi (207 bar, 20.7 MPa) Maximum Working Pressure
Important Safety Instructions
Read all warnings and instructions in this manual and in gas engine manual.
Be familiar with the controls and the proper usage of the equipment.
Save these instructions.
Model
Express 3900
17A624
Related Manuals:
334122
312830
334123
17Z521
334121B
EN
ti23883a

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Summary of Contents for Graco Express 3900

  • Page 1 Operation Express 3900 334121B Airless Sprayer For professional use only. Not approved for use in explosive atmospheres or hazardous locations. For portable airless spraying of architectural coatings and paints. 3000 psi (207 bar, 20.7 MPa) Maximum Working Pressure Important Safety Instructions Read all warnings and instructions in this manual and in gas engine manual.

  • Page 2: Table Of Contents

    Maintenance ......13 Graco Standard Warranty ....24...
  • Page 3 Check hoses and parts for signs of damage. Replace any damaged hoses or parts. • This system is capable of producing 3000 psi (20.7 MPa, 207 bar). Use Graco replacement parts or accessories that are rated a minimum of 3000 psi (20.7 MPa, 207 bar).
  • Page 4 Warning WARNING EQUIPMENT MISUSE HAZARD Misuse can cause death or serious injury. • Do not operate the unit when fatigued or under the influence of drugs or alcohol. • Do not exceed the maximum working pressure or temperature rating of the lowest rated system component. See Technical Data in all equipment manuals.

  • Page 5: Component Identification

    Component Identification Component Identification ti23884a Engine Controls Engine ON/OFF Switch Pump Grounding Clamp Strainer Pump On/Off Switch Gun Trigger Lock Pressure Control Hose Prime Valve Easy Out Pump Filter Drain Hose 334121B...

  • Page 6: Grounding

    Grounding Grounding Air and fluid hoses: Use only electrically conductive hoses with a maximum of 500 ft. (150 m) combined hose length to ensure grounding continuity. Check elec- trical resistance of hoses. If total resistance to ground The equipment must be grounded to reduce the risk exceeds 29 megohms, replace hose immediately.

  • Page 7: Operation

    1. Engage trigger lock. 1. Connect appropriate Graco high-pressure hose to 2. Turn engine ON/OFF switch to OFF. sprayer and tighten securely. 3. Move pump switch to OFF and turn pressure control 2.

  • Page 8: Startup

    Startup Startup 4. When spraying texture, remove inlet strainer and fil- ter bowl screen before spraying these materials. 1. Place suction tube and drain tube in grounded metal pail partially filled with flushing fluid. Attach ground wire to pail and to earth ground. ti22701a 5.
  • Page 9 Startup b. Move choke to closed. ti5249a ti23885b c. Set throttle to fast. 7. Hold gun against grounded metal flushing pail. Trig- ger gun and increase fluid pressure slowly until pump runs smoothly. ti5250a d. Set engine switch to ON. ti22710a ti13243a ti13243a...

  • Page 10: Switchtip Installation

    SwitchTip Installation SwitchTip Installation 2. Hold gun perpendicular, 10-12 in. (25-30 cm) from surface. Spray back and forth. Overlap by 50%. Trigger gun after moving and release before stop- ping. 1. Perform Pressure Relief Procedure, page 7. 2. Engage gun trigger lock. Insert SwitchTip. Insert ti13025a ™...

  • Page 11: Cleanup

    Cleanup Cleanup d. Set engine switch to ON. 1. Perform Pressure Relief Procedure, page 7. Remove siphon tube set from paint and place in flushing fluid. Remove tip guard from gun. ti5262b 3. Pull rope to start engine. ti5263a 4. Turn pump switch ON. Turn prime valve forward to SPRAY position.
  • Page 12 Cleanup 6. Move gun to waste pail, hold gun against pail, and 10. Turn prime valve down DRAIN position. trigger gun to thoroughly flush system. Release trig- ger and engage trigger lock. 11. Remove filters from gun and sprayer, if installed. ti14847a Clean and inspect.

  • Page 13: Maintenance

    Maintenance Maintenance Replacement elements can be purchased from your local HONDA dealer. AFTER EACH 100 HOURS OF OPERATION: NOTE: For detailed engine maintenance and specifica- Change engine oil. Reference Honda Engines Owner's tions, refer to separate Honda Engines Owner's Manual, Manual for correct oil viscosity.

  • Page 14: Troubleshooting

    At 70° F, the resistance must be between 1.2 + 0.2 , if not, replace pinion housing. Have pressure control checked by authorized Graco dealer. Clutch is worn, damaged, or incorrectly Adjust or replace clutch. See Pinion Assem- positioned.
  • Page 15 Troubleshooting Problem Cause Solution Pump output is low Strainer is clogged. Clean strainer. Piston ball is not seating. Service piston ball (see pump manual). Piston packings are worn or damaged. Replace packings (see pump manual). O-ring in pump is worn or damaged. Replace o-ring (see pump manual).

  • Page 16: Fluid Pump Runs Constantly

    Troubleshooting Fluid Pump Runs Constantly 1. Perform Pressure Relief Procedure, page 7, turn prime valve forward to SPRAY position, and turn power switch OFF. 2. Remove control box cover. Troubleshooting Procedure: Pump problem. See the proper fluid pump With a pressure gauge plumbed into the paint manual for the sprayer for further trouble- hose, start the engine.

  • Page 17: Control Board Malfunction

    Troubleshooting Control Board Malfunction Troubleshooting Procedure (see following page for actual steps): Remove control box cover. Turn sprayer ON. Observe control board Green and Red LED lights. Go to step 1. No light Replace the Does switch switch. Once Normal operation test positive? Red light on Control board...

  • Page 18: Control Board Malfunction (Steps)

    Troubleshooting Control Board Malfunction (Steps) STEP 3. STEP 1. STEP 2. Leave engine Turn engine Turn engine 10-12 DC BEEP 12 -20 AC running and turn OFF and set ON. Set meter switch ON. Turn to AC volts and meter to potentiometer to continuity.

  • Page 19: Digital Display Messages

    Check fluid path for clogs, such as clogged filter. is running. Open prime valve and gun if running AutoClean. Use Graco paint hose, 1/4 in. x 50 ft minimum. Smaller hose or metal braid hose may result in pressure spikes.

  • Page 20: Pinion Assembly/Clutch Armature/Clamp

    Pinion Assembly/Clutch Armature/Clamp Pinion Assembly/Clutch Armature/Clamp Pinion Assembly/Clutch Armature Removal 7. Remove retaining ring (29b). 8. Turn pinion assembly over and tap pinion shaft Pinion Assembly (29a) out with plastic mallet. If pinion assembly (29) is not removed from clutch hous- ing (19), do 1.

  • Page 21: Installation

    Pinion Assembly/Clutch Armature/Clamp Installation Clutch Armature 5. Push screwdriver into slot in clamp (22) and remove clamp. 1. Lay two stacks of shims equal to 0.12+0.01inch (3.0mm+0.25mm) on smooth bench surface. 2. Lay armature (25) on the two stacks of shims. 3.
  • Page 22 Notes Notes 334121B...

  • Page 23: Technical Data

    Technical Data Technical Data Express 3900 Model U.S. Metric Engine Honda GX120 Engine ANSI Power Rating @ 3600 rpm 4.0 Horsepower 3.0 kW Sprayer Maximum Working Pressure 3000 psi 207 bar, 20.7 MPa Maximum Delivery Rating 1.25 gpm 4.73 lpm...

  • Page 24: 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.

This manual is also suitable for:

17a624

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