Graco Electrostatic Air Spray Gun L85T50

Electrical components inside the gun affect performance and safety. Use the following procedures to test the condition of the power supply and gun body, and electrical continuity between components.

Use megohmmeter Part No. 241079 (AA) and an applied voltage of 500 V. Connect the leads as shown.

⚠️⚠️⚡️ Megohmmeter Part No. 241079 (AA – see Fig. 17) is not approved for use in a hazardous location. To reduce the risk of sparking, do not use the megohmmeter to check electrical grounding unless:

• The gun has been removed from the hazardous location;

• Or all spraying devices in the hazardous location are turned off, ventilation fans in the hazardous location are operating, and there are no flammable vapors in the area (such as open solvent containers or fumes from spraying).

Failure to follow this warning could cause fire, explosion, and electric shock and result in serious injury and property damage.

Test Gun Resistance 1. Flush and dry the fluid passage.

2. For Model L40M14, L40T14, L40M15, and L40T15 guns only: Test the barrel continuity to verify that the metal pin in the barrel is properly grounded. Measure resistance between the metal pin (GP) and the air swivel (21). The resistance should be less than 100 ohms. If the resistance is 100 ohms or more, replace the gun body.

3. For all guns: Trigger the gun and measure resistance between the electrode needle tip (3) and the air swivel (21). The resistance should be:

Check gun resistance, hose resistance, and electrical grounding daily.

Check hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.

Check equipment daily. Repair or replace worn or damaged parts immediately with genuine manufacturer’s replacement parts only.

⚠️ To reduce the risk of an injury, follow the Pressure Relief Procedure, page 37, whenever you are instructed to relieve the pressure.

Daily Care and Cleaning Checklist

Check the following list daily upon completion of equipment usage.

- Flush the gun. See Flushing, page 39.

- Clean the fluid and air line filters.

- Clean the outside of the gun. See Clean the Gun Daily, page 41.

Power supply/alternator assembly removed and alternator disconnected

Resistance between the two outer terminals of the 3-wire connector

Fan and coil assembly pushed out the front of the housing

Do not scratch or damage the magnet or shaft. Do not pinch or damage the 3-wire connector when disassembling and reassembling the bearings.