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Troubleshooting
334606C 29
Troubleshooting
Problem Cause Solution
Gas engine pulls hard (won’t
start)
Hydraulic pressure is too high Turn hydraulic pressure knob
counterclockwise to lowest
setting
Gas engine does not start Switch OFF, low oil, no gasoline Consult engine manual
Fuel shut off valve closed Open fuel shut off valve
Gas engine does not work
properly
Faulty engine Consult engine manual
Elevation Refer to Engine Repair Kit, 4.0
hp - 288678 / 5.5 hp - 248943 /
6.5 hp - 248944 / 9.0 hp -
248945
Electric motor does not start
starts slowly
No power Check power source; check
circuit breakers and/or fuses.
Reset/replace as required.
Cord not connected to power
source
Connect plug to receptacle
(grounded with properly sized
circuit breaker and/or fuses).
Switch OFF 1 phase motors: Turn on/off
switch to ON.
3 phase motors: Push ON
switch.
Incorrect power source
Have a certified electrician or
authorized Graco Repair Center
evaluate and repair.
See Technical Data, pages
60-63.
NOTE: If using the EH300DI
sprayer, the generator must be
sized for 15 kW output
minimum.
Incorrect amp setting on motor
starter (3 phase motor only)
Have a certified electrician or
authorized Graco Repair Center
evaluate and repair.
See Technical Data, pages
60-63.
Over current switch has tripped
Have a certified electrician or
authorized Graco Repair Center
evaluate and repair.
See Technical Data, pages
60-63.
Hydraulic pressure is too high
Turn hydraulic pressure knob
counter clockwise to lowest
setting.