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PROBLEM
Gas engine pulls hard (won't start)
Gas engine does not start
Gas engine doesn't work properly
Gas engine operates, but displacement pump
doesn't operate
Displacement pump operates, but output is low
on upstroke
Displacement pump operates but output is low
on downstroke and/or on both strokes
Paint leaks and runs over side of wetcup
Excessive leakage around hydraulic motor
piston rod wiper
Fluid delivery is low
The sprayer overheats
Spitting from gun
Excessive hydraulic pump noise
Electric motor does not operate
*Check hydraulic fluid level often. Do not allow it to become too low. Use only Graco approved hydraulic fluid, page 7.
310765B
Troubleshooting
CAUSE
Hydraulic pressure is too high
Switch OFF, low oil, no gasoline
Faulty engine
Elevation
Pump valve is OFF
Pressure setting too low
Displacement pump outlet filter (if used) is dirty
or clogged
Tip or tip filter (if used) is clogged
Hydraulic fluid too low
Belt worn or broken or off
Hydraulic pump worn or damaged
Dried paint seized paint pump rod
Hydraulic motor not shifting
Piston ball check not seating properly
Piston packings worn or damaged
Piston packings worn or damaged
Intake valve ball check not seating properly
Suction tube air leak
Loose wet-cup
Throat packings worn or damaged
Piston rod seal worn or damaged
Pressure setting too low
Displacement pump outlet filter (if used) is dirty
or clogged
Intake line to pump inlet is not tight
Hydraulic motor is worn or damaged
Large pressure drop in fluid hose
Paint builup on hydraulic components
Oil level is low
Air in fluid pump or hose
Loose intake suction
Fluid supply is low or empty
Low hydraulic fluid level
Power switch is not ON
Tripped circuit breaker
Troubleshooting
SOLUTION
Turn hydraulic pressure knob counterclockwise
to lowest setting
Consult engine manual, supplied
Consult engine manual, supplied
Refer to 6.5 HP Engine Repair Kit, 246311
Set pump valve ON
Increase pressure, page 10
Clean the filter
Remove tip and/or filter and clean
Shut off sprayer. Add fluid*. See page 7
Replace. See manual 310548
Bring sprayer to Graco distributor for repair
Service pump. See manual 309277
Set pump valve OFF. Turn pressure down. Turn
engine OFF. Pry rod up or down until hydraulic
motor shifts. Manual 310548
Service piston ball check. See manual 309277
Replace packings. See manual 309277
Tighten packing nut or replace packings. See
manual 309277
Service intake valve ball check. See manual
309277
Tighten wet-cup enough to stop leakage
Replace packings. See manual 309277
Replace these parts. See manual 310548
Increase pressure, page 10
Clean filter
Tighten
Bring sprayer to Graco distributor for repair
Use larger diameter or shorter hose
Clean
Fill with oil. See page 7
Check for loose connections on siphon assem-
bly, tighten, then reprime pump
Tighten
Refill supply container
Turn sprayer OFF. Add fluid*. See page 7
Turn power switch to ON
Check circuit breaker at power source. Reset
motor switch
27
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