Troubleshooting
334558D 27
Troubleshooting
Problem Cause Solution
Internal combustion engine
pulls hard (won’t start)
Hydraulic pressure is too high Turn hydraulic pressure knob
counterclockwise to lowest
setting
Gasoline engine does not start Switch OFF, low oil, no gasoline Consult engine manual
Fuel shut off valve closed Open fuel shut off valve
Gasoline 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
Diesel engine does not start No fuel
Incorrect injection timing, rings
worn or sticking.
Consult engine manuals
Diesel engine does not work
properly
Faulty engine Consult engine manuals
Poor fuel quality Drain fuel tank and replace fuel
with good clean fuel
Internal combustion engine
operates, but displacement
pump does not operate
Hydraulic pump valve is OFF Set hydraulic pump valve ON
Pressure setting too low Increase pressure, page
20.
Displacement pump outlet filter
(if used) is dirty or clogged
Clean the filter
Tip or tip filter (if used) is
clogged
Remove tip and/or filter and
clean
Hydraulic fluid too low Shut off sprayer. Add fluid*. See
page
17.
Belt worn or broken or off Replace.
Hydraulic pump worn or
damaged
Bring sprayer to Graco
distributor for repair
Dried paint seized paint pump
rod
Service pump. See manual
334654
Hydraulic motor not shifting Set pump valve OFF. Turn
pressure down. Turn engine
OFF. Pry rod up or down until
hydraulic motor shifts.
Displacement pump operates,
but output is low on upstroke
Piston ball check not seating
properly
Service piston ball check. See
manual 334654
Piston packings worn or
damaged
Replace packings. See manual
334654
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