Hitachi 308640 manual Adjust the Spray Pattern, Recoil Hazard

Page 9

Operation

Adjust the Spray Pattern

WARNING

RECOIL HAZARD

Due to the very high pressure fluid emitted, a strong recoil action will occur when you trigger this gun. If you are

unprepared, your hand could be forced back toward your body or you could lose your balance and fall, resulting in serious injury.

WARNING

INJECTION HAZARD

To reduce the risk of component rupture

and serious injury, including injection, do not exceed the gun's maximum fluid

working pressure of 4000 psi (28 MPa, 280 bar) or the maximum working pressure of the lowest rated component in the system.

5.Set the atomizing air pressure at about 10 psi (0.7 bar, 70 kPa). Check the spray pattern, then adjust the air pressure until the tails are completely atomized and pulled into the spray pattern. See Fig. 5. Do not exceed 100 psi (0.7 MPa, 7 bar) air pressure to the gun.

For a narrower pattern, turn the pattern adjustment valve knob clockwise. If the pattern is still not narrow enough, increase the air pressure to the gun slightly or use a different size tip.

NOTE: Pattern adjustment is not available with guns with the AA RAC assembly as the air separa- tor, part no. 178414, must be removed when the RAC assembly is installed.

Pattern

Adjustment

Knob

1.Set the fluid pressure with the fluid regulator. Do not turn on the air supply yet.

2.Trigger the gun to check the atomization; do not be concerned about the pattern shape yet.

3.Increase the fluid pressure just to the point where a further increase in fluid pressure does not signifi- cantly improve fluid atomization.

4.Close the pattern adjustment valve by turning the knob (see Fig. 4) counterclockwise all the way. This sets the gun for its widest pattern.

0789A

Fig. 4

No Air

Too Little Air

Right Amount

 

 

 

of Air

Fig. 5

 

 

0792

 

 

 

 

308640 9

Image 9
Contents Part No , Series a 308640Part No , Series B This manual contains important warnings and informationTable of Contents Equipment Misuse Hazard Typical Installation InstallationVentilate the Spray Booth T QConnect the Fluid Line Connect the Air LineGround the System Fluid supply container Ground it according to local codeObject being sprayed Ground it according to local code Safety Pressure Relief ProcedureOperation How the Air-Assisted Spray Gun Operates Install a Spray TipSelect a Spray Tip and Air Cap Your applicationRecoil Hazard Adjust the Spray PatternApply the Fluid Check the Diffuser-seat Operation Weekly Clean the Spray Gun and System DailyFlush the Gun Daily 308640 General Troubleshooting TroubleshootingProblem SolutionSpray Pattern Troubleshooting Service Air Valve ServiceFluid Needle Cartridge Service 10b 10a AIR Service NotesPart No , 238852, 238883, PartsRepair Kits Description QtyDescription Qty 35Y 172479 TAG, instruction not shown 14a 238755 NEEDLE, fluid, hi-flow Included with 10b 111517 RING, backup Ptfe r 238701192096 239172Standard Spray Tips, for use with Air Cap Spray Tip Selection ChartsFluid output at 600 psi 4.1 MPa, 41 bar On the next Dimensions Measurements, inches mm Gun238402 238851 238852 238883 239001 241070 Sound Data Technical DataAccessories Graco Phone Number Graco Standard WarrantyManual Change Summary Manual changed per ECO