Troubleshooting; Mechanical/Fluid Flow - AIRLESSCO MP 455 Operation - Repair - Parts

Troubleshooting

Mechanical/Fluid Flow

1. Follow Pressure Relief Procedure,
page 12, before checking or repairing.
Problem
Pump output is low
3A4180C
2.
What to Check
If check is OK, go to next
check
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
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
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