Graco PR-Xv Instructions Manual page 55

Problem
Material weight incorrectly
dispensed
Leakage from Static Mixer
Package (AA, page 8) tip
Cause
Needle or Static Mixer Package
(AA, page 8) clogged
TC Dispense Valve (AB, page 8) or
fluid lines clogged
TC Dispense Valve (AB, page 8)
opened or closed incorrectly
Input air reduced or removed
Supply pump ball valve not closed
(if installed)
Inlet valve (AE, page 8) leaking (if
installed)
Piston worn out or broken
Air in Static Mixer Package (AA,
page 8)
TC Dispense Valve (AB, page 8) not
closed
TC Dispense Valve (AB, page 8)
needle and/or seat worn out
(pressure reduces after closing the
valve)
Damaged or missing gasket (O-ring)
between seat and housing (hard
seat only)
High pressure
Solution
Replace needle or Static Mixer Package
(AA, page 8). Incorporate purge timer or
decrease purge timer delay to prevent
Static Mixer Package (AA, page 8)
blockage
Clean TC Dispense Valve (AB, page 8) or
fluid lines
1. Verify TC Dispense Valve's (AB, page 8)
inlet air pressure.
2. Inspect TC Dispense Valve (AB, page 8)
air cylinder and adapters for leaks.
Reconnect input air line to system.
Increase air pressure regulator adjustment.
1. Inspect supply pump ball valve for wear
and tear.
2. Verify rotary cylinder inlet pressure.
Inspect needle and seal components
Replace piston
Slow speed purging
1. Verify TC Dispense Valve's (AB, page 8)
inlet air pressure.
2. Clean blockage between needle and
seat.
3. Verify solenoid valve status.
Replace TC Dispense Valve (AB, page 8)
needle and/or seat
Replace gasket (O-ring)
See solutions for problem of high pressure
Troubleshooting
55