Graco Dyna-Star 77X000 Instructions Manual page 18

Troubleshooting
Problem
Control board temperature is
high - 6 blinks
Loose or damaged HALL sensor
cable - 7 blinks
Motor runs but pump does not
Control board LED's blink erratically Damaged control board
18
Cause
System pressure too high
Current Control Potentiometer Knob
(G) on control board is set too low
Motor is damaged
Motor control switch (J) is set to PWR
mode. Pump cycling is not controlled
by signal output and pump is running
continuously
High duty cycle
HALL sensor cable not securely
attached
Damaged HALL sensor cable
Motor shaft/gears are stripped or
damaged
Solution
Reduce system pressure by installing
larger diameter lubrication tubes.
Increase the current limit by turning
the Current Control Potentiometer
Knob (G), clockwise.
Separate motor from pump and run
motor. If motor is damaged, replace
motor. See Motor Replacement
instructions, page 28.
Change motor control switch (J) to
signal mode (SIG).
Reduce duty cycle.
Verify HALL sensor cable is securely
attached. Tighten connection.
Replace motor.
Gear box is damaged. Replace
pump.
Replace motor control board. See
Motor Control Board Replacement
instructions, page 31.
332514J