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Troubleshooting
12 309674M
Low Output Leads from motor to pressure control
circuit board for damaged or loose
wires or connectors. Inspect wiring
insulation and terminals for signs of
overheating.
Be sure male terminal blades are
centered and firmly connected to
female terminals. Replace any loose
terminal or damaged wiring. Securely
reconnect terminals.
Low stall pressure. Do either or both:
a. Turn pressure control knob
fully clockwise. Make sure
pressure control knob is
properly installed to allow full
clockwise position.
b. Try a new transducer.
These problems only apply to Ultra,
Nova and STMax 395/495/595
model sprayers with brush motors.
They do not apply to UltraMax II,
Ultimate MX II and ST Max II
490/495/595 model sprayers.
Motor armature for shorts by using an
armature tester (growler) or perform
spin test. See page 18.
Replace motor. See page 29.
Loose motor brushes and terminals. Tighten terminal screws. Replace
brushes if leads are damaged.
Worn motor brushes. (Brushes must
be 1/2 in. minimum.)
Replace brushes.
Broken and misaligned motor brush
springs. Rolled portion of spring must
rest squarely on top of brush.
Replace spring if broken. Realign
spring with brush.
Motor brushes are binding in brush
holders.
Clean brush holders, remove carbon
dust with small cleaning brush. Align
brush lead with slot in brush holder
to assure free vertical brush
movement.
Motor runs and pump strokes Low paint supply. Refill and reprime pump.
Intake strainer clogged. Remove and clean, then reinstall.
Suction tube or fittings loose. Tighten; use thread sealant or
sealing tape on threads if necessary.
See if intake valve ball and piston ball
are seating properly. See pump
manual.
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.
Leaking around throat packing nut
which may indicate worn or damaged
packings. See pump manual.
Replace packings. Also check piston
valve seat for hardened paint or nicks
and replace if necessary. Tighten
packing nut/wet-cup. See pump
manual.
Pump rod damage. Replace pump, page 15.
Type of Problem
What to Check
(if check is OK, go to next)
What to Do
(When check is not OK, refer to this
column)