Graco PRO Auto Xs Instructions-Parts List Manual page 35

11. If the meter reading is 55-60 kV, the gun power sup-
ply is okay, and there is probably a dielectric break-
down somewhere in the fluid hose or gun. Continue
with step 12.
If the reading is below 55 kV, do the electrical tests
on page 30 to check the gun and power supply
resistance. If those tests show the gun and power
supply are okay, continue with step 12.
12. A dielectric breakdown is most likely in one of the
following three areas. Repair or replace the compo-
nent that is failing.
• Fluid hose
Check for leakage or any bulges in the outer
cover, which may indicate a pin-hole leak
through the PTFE layer. Disconnect the fluid
hose from the gun, and look for signs of fluid
contamination on the outside of the PTFE por-
tion of the fluid tube.
Inspect the end of the hose connected to the
voltage isolation system. Look for cuts or nicks.
Make sure the hose is properly stripped. Restrip
or replace the hose.
• Fluid packings
Remove the packing assembly from the gun as
instructed on page 43, and look for signs of fluid
leakage or any blackened areas, which would
indicate arcing is occurring along the packing
rod.
• Fluid hose connection joint to the spray gun
A breakdown at the fluid hose connection joint
would be caused by fluid leaking past the o-ring
seals on the end of the hose. Remove the hose
at the gun connection and look for signs of fluid
leakage along the PTFE tube.
309457G
13. Before reassembling the gun, clean and dry the gun
fluid inlet tube. Repack the inner spacer of the fluid
packing rod with dielectric grease and reassemble
the gun.
14. Reconnect the fluid hose.
15. Check the gun voltage with the voltage probe and
meter before filling the gun with fluid.
Troubleshooting
35