Hitachi AA 2000 - Manual (Page 12)

12ą307-586
Troubleshooting
WARNING
INJECTION HAZARD
To reduce the risk of a fluid injection
injury, follow the Pressure Relief Proce-
dure on page 7 before checking or
servicing any of the system equipment and when-
ever you are instructed to relieve pressure.
NOTE:
D Check all possible remedies in the troubleshooting
charts before disassembling the gun.
D Some improper patterns are caused by the
improper balance between air and fluid.
General Troubleshooting
Problem Cause Solution
Fluid leakage from back of fluid
needle Worn packings (47) or needle (5)
shaft Replace packings or needle. See
page 14.
Air leakage from front of gun Air valve (52) not seating properly Clean/service air valve. See page 14.
Fluid leakage from front of gun Fluid needle (5) worn or damaged Replace fluid needle. See page 14. Fluid leakage from front of gun
Worn diffuser-seat (30) housing Replace the diffuser-seat and gasket
(33). The gasket must be replaced
whenever the diffuser-seat is re-
moved. See page 14.
Fluid in air passages Fluid tip (28) seal leaking Tighten or replace fluid tip. Fluid in air passages
Leaking around diffuser-seat (30)
housing Replace the diffuser-seat gasket (33).
The gasket must be replaced when-
ever the diffuser-seat is removed.
See page 14.
Fluid inlet fitting (67) leaking Replace the fluid fitting gasket (33).
The gasket must be replaced when-
ever the fluid fitting is removed. See
page 15.
Spray Pattern Troubleshooting
Problem Cause Solution
Fluttering or spitting spray Insufficient fluid supply
Air in paint supply line
Adjust fluid regulator or fill fluid supply
tank.
Check, tighten siphon hose connec-
tions, bleed air from paint line.
Irregular pattern Fluid build-up or spray tip partially
plugged
On defective side of pattern, air horn
holes are partially or totally plugged
Clean spray tip. See page 10.
Clean air horn holes with solvent and
soft brush. See page 10.
Pattern pushed to one side, same
side of air cap gets dirty Air horn holes partially or totally
plugged Clean air horn holes with solvent and
soft brush. See page 10.