Troubleshooting
3A4180C 23
Troubleshooting
Mechanical/Fluid Flow
1. Follow Pressure Relief Procedure,
page 12, 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
Pump output is low Spray tip worn. Follow Pressure Relief
Procedure, page 12, 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 12, 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.
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