Troubleshooting - Graco 3A4133 Operation - Repair - Parts

Troubleshooting

Mechanical/Fluid Flow
1. Follow Pressure Relief Procedure,
page 13, before checking or repairing.
Problem
For units with display:
E=0X is displayed.
For units with no display:
Control board status light is
blinking or the light is off and
there is power to the sprayer.
Pump output is low
3A4187C
2.
What to Check
If check is OK, go to next
check
Fault condition exists.
Spray tip worn.
Spray tip clogged.
Paint supply.
Intake strainer clogged.
Intake valve ball and piston ball
are not seating properly.
Fluid filter or tip filter is clogged
or dirty.
Prime valve leaking.
Verify pump does not continue
to stroke when gun trigger is
released. (Prime valve not
leaking.)
Leaking around throat packing
nut which may indicate worn or
damaged packings.
Troubleshooting
Check all possible problems and causes
before disassembling the unit.
When check is not OK,
refer to this column
Determine fault correction from
Electrical, page 30.
Follow Pressure Relief
Procedure, page 12, then
replace tip. See separate gun
or tip manual.
Relieve pressure. Check and
clean spray tip.
Refill and reprime pump.
Remove and clean, then
reinstall.
Remove intake valve and
clean. Check balls and seats
for nicks; replace if necessary.
See pump manual. Strain paint
before using to remove
particles that could clog pump.
Clean filter.
Follow Pressure Relief
Procedure, page 12, then
repair prime valve.
Service pump. See pump
manual.
Replace packings. See pump
manual. Also check piston
valve seat for hardened paint
or nicks and replace if
necessary. Tighten packing
nut/wet-cup.
What to Do
27