Gun Operation Troubleshooting - Graco PRO 5500hc Instructions Manual

Gun Operation Troubleshooting

PROBLEM
Fluid leakage from the fluid packing
area
Fluid leakage from the front of the
gun
"Orange Peel" finish
Excessive spray fog
No fluid sprays from the gun
The equipment is covered with fluid
Dirty air cap
Air leakage from the air cap
Air leakage from the manifold
Fluid leakage at the quick-disconnect
24 308–442
Troubleshooting
CAUSE
The fluid rod packings or fluid rod are
worn.
The fluid rod is worn or damaged.
The fluid seat is worn.
The resistor stud is loose.
The fluid nozzle is loose.
The resistor stud o-ring is damaged.
The air pressure is insufficient.
The fluid is poorly mixed or filtered.
An improper thinner is being used.
The air pressure is too high.
The fluid is thinned too much.
The fluid supply is low.
The fluid nozzle is dirty or clogged.
The fluid nozzle is damaged.
The piston is not actuating.
The actuator arm is out of position.
The exhaust air flow is insuf ficient or not
directed properly.
The distance between the gun and work-
piece is incorrect.
The electrode is bent.
The nozzle orifice is damaged.
The fluid is coming on before the air.
The air cap and fluid nozzle are mis-
aligned.
Air
Cap
Fluid
Nozzle
ALIGNED MISALIGNED
The o-rings on the piston stem are worn.
The manifold gasket is damaged, or the
manifold is not tight.
The manifold is not tight.
The o-rings on the fluid hose are worn or
missing.
SOLUTION
Replace the packings or rod; see page
31.
Replace the fluid rod; see page 31.
Replace the fluid nozzle and/or electrode
needle; see page 29 and 30.
Tighten the resistor stud; see page 29.
Tighten the fluid nozzle; see page 29.
Replace the o-ring; see page 29.
Increase the air pressure; use the least air
pressure needed for good results.
Remix or refilter the fluid.
Use the proper thinner.
Reduce the air pressure; use the least air
pressure needed for good results.
Properly thin the fluid.
Check the fluid supply; add fluid if
necessary.
Clean the fluid nozzle; see page 21.
Replace the fluid nozzle; see page 29.
Check the cylinder air; check the piston
u-cup; see page 32.
Check the actuator arm and nuts; see
page 33.
Check for the proper CFM; check the
baffles and direction of the air flow.
Adjust the spraying distance to 8 to 12
inches (203 to 305 mm).
Straighten the electrode.
Replace the fluid nozzle; see page 29.
Check the actuator arm and nuts; see
page 33.
Check the air cap and fluid nozzle seat for
fluid buildup. Clean or replace parts as
needed; see page 21 or 29.
Inspect the o-rings; replace them as
needed; see page 32.
Replace the gasket or tighten the manifold
screws; see page 37.
Tighten the manifold screws; see page
37.
Inspect or replace the o-rings.