Graco Pro 230ES Repair And Parts Manual page 14

Troubleshooting
Type of Problem
These problems only apply to Pro
230ES model sprayers with brush
motors. They do not apply to Pro
270ES.
Motor runs and pump strokes
Motor runs but pump does not
stroke.
14
What to Check
(if check is OK, go to next)
Motor armature for shorts by using
an armature tester (growler) or per-
form spin test, page 22.
Loose motor brushes and terminals.
Worn motor brushes. (Brushes
must be 1/2 in. minimum)
Broken and misaligned motor brush
springs. Rolled portion of spring
must rest squarely on top of brush.
Motor brushes are binding in brush
holders.
Low paint supply.
Intake strainer clogged.
Suction tube or fittings loose.
See if intake valve ball and piston
ball are seating properly. See pump
manual.
Leaking around throat packing nut
which may indicate worn or dam-
aged packings. See pump manual.
Pump rod damage.
Displacement pump pin damaged
or missing.
Connecting rod assembly damaged.
Gears or drive housing, page 20.
What to DO
(When check is not OK, refer to
this column
Replace motor. See page 33.
Tighten terminal screws. Replace
brushes if leads are damaged.
Replace brushes.
Replace spring if broken. Realign
spring with brush.
Clean brush holders, remove car-
bon dust with small cleaning brush.
Align brush lead with slot in brush
holder to assure free vertical brush
movement.
Refill and reprime pump.
Remove and clean, then reinstall.
Tighten; use thread sealant or seal-
ing tape on threads necessary
Remove intake valve and clean.
Check balls and seats for nicks,
replace if necessary. Strain paint
before using to remove particles
that could clog pump. See pump
manual.
Replace packings. Also check pis-
ton valve seat for hardened paint or
nicks and replace if necessary.
Strain paint before using to remove
particles that could clog pump. See
pump manual.
Replace pump, page 17.
Replace pump pin if missing. Be
sure retainer spring is fully in groove
all around connecting rod, page 17.
Replace connecting rod assembly.
See pump manual.
Inspect drive housing assembly and
gears for damage and replace if
necessary, page 20.
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