Troubleshooting
28
334466F
Troubleshooting
Mechanical/Fluid Flow
1.
Follow
Pressure Relief Procedure
,
page 13, before checking or repairing.
2.
Check all possible problems and causes
before disassembling the unit.
Problem
What to Check
If check is OK, go to next
check
What to Do
When check is not OK,
refer to this column
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.
Fault condition exists.
Determine fault correction from
Electrical
, page 31.
Pump output is low
Spray tip worn.
Follow
Pressure Relief Procedure
,
page 13, then replace tip. See
separate gun or tip manual.
Spray tip clogged.
Relieve pressure. Check and clean
spray tip.
Paint supply.
Refill and reprime pump.
Intake strainer clogged.
Remove and clean, then reinstall.
Intake valve ball and piston ball are
not seating properly.
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.
Fluid filter or tip filter is clogged or
dirty.
Clean filter.
Prime valve leaking.
Follow
Pressure Relief Procedure
,
page 13, then repair prime valve.
Verify pump does not continue to
stroke when gun trigger is released.
(Prime valve not leaking.)
Service pump. See pump manual.
Leaking around throat packing nut
which may indicate worn or damaged
packings.
Replace packings. See pump manual.
Also check piston valve seat for
hardened paint or nicks and replace if
necessary. Tighten packing
nut/wet-cup.
