Graco RoadLazer RoadPak Repair Manual page 34

Troubleshooting
PROBLEM
Bead guns not synchronizing
with paint guns
Paint guns not turning off imme-
diately or at all
Gun arm wobbling or hopping
excessively
Excessive overspray on gun arm
wheel
Pulsation in spray pattern
34
CAUSE
Out of calibration
Valve needle
Swivel nut
Paint guns out of position
Low or erratic pressure in paint
pump
SOLUTION
1. Follow calibration in Programmable Skipline
Controller manual 3A5387.
2. If beads start before paint, add delay time to
Bead ON Delay. If paint starts before beads,
add equal delay time to both Paint ON and
Paint OFF Delays (this does not affect paint
skip line length).
3. If beads end before paint, add delay time to
Bead OFF Delay. If beads end after paint,
add equal delay time to both Paint ON, Paint
OFF and Bead ON Delays. This shifts
everything forward.
1. Spray needle with light coat of lubricant. Use
air hose or water hose to break up and
remove solidified paint.
2. Replace needle, seat, and packings Repair
Kit 238339).
Gun arm wobbles
1. Remove dust cap (47).
2. Tighten boom arm swivel nut until swivel
has slight restriction.
Gun arm hops
1. Lower air pressure in gun arm wheel.
2. Replace damaged gas shock (7).
1. Angle paint guns back 15° to 20°.
2. Coat wheel and gun arm parts with non-stick
cooking oil, light oil, silicon, or Auto Mask
ZEP to prevent paint from sticking to them.
1. Check paint supply and suction inlet
screens.
2. Replace spray tips.
3. Check outlet filter.
4. Replace packings. Clean and service intake
valve and piston valve.
3A5385A