Graco RentalPro 230 HDR Operation Instructions Manual page 24

Troubleshooting
Type of Problem
Motor runs and pump strokes
Motor runs but pump does not stroke Displacement pump pin damaged or
Motor is hot and runs intermittently
Building circuit breaker opens as
soon as sprayer switch is turned on
CAUTION
Any short in any part of the motor
power circuit will cause the control
circuit to inhibit sprayer operation.
Correctly diagnose and repair all
shorts before checking and replacing
control board.
Building circuit breaker opens as
soon as sprayer is plugged into outlet
and sprayer is NOT turned on.
24
What to Check
(if check is OK, go to next)
Leaking around throat packing nut
which may indicate worn or damaged
packings.
Pump rod damage.
missing.
Connecting rod assembly damaged.
Gears or drive housing.
Determine if sprayer was operated at
high pressure with small tips, which
causes low motor RPM and
excessive heat buildup.
Be sure ambient temperature where
sprayer is located is not more than
90°F (32.22°C) and sprayer is not
located in direct sun.
All electrical wiring for damaged
insulation and all terminals for loose
fit or damage. Also, wires between
pressure control and motor.
For missing inspection plate gasket,
bent terminal forks or other metal to
metal contact points which case a
short.
Motor control board by performing
Motor Control Board Diagnostics.
See Motor Control Board
Diagnostics, page 26. If diagnostics
indicate, substitute with a good
board.
CAUTION: Do not perform this check
until motor armature is determined to
be good. A bad motor armature can
burn out a good board.
Basic Electric Problems, page 22 of
Troubleshooting.
What to Do
(When check is not OK, refer to this
column)
Replace packings. Also check piston
valve seat for hardened paint or nicks
and replace if necessary. Tighten
packing nut/wet-cup. See pump
manual 309250.
Replace pump.
Replace pump pin if missing. Be sure
retainer spring is fully in groove all
around connecting rod.
Replace connecting rod assembly.
See pump manual 309250.
Inspect drive housing assembly and
gears for damage and replace if
necessary.
Decrease pressure setting or
increase tip size.
Move sprayer to shaded, cooler area
if possible.
Repair or replace any damaged
wiring or terminals. Securely
reconnect all wires.
Correct faulty conditions.
Replace with a new pressure control
board.
Perform necessary procedures.
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