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To reduce risk of serious injury, when instructed to relieve pressure, do steps 1. – 3.; page 14.
PROBLEM
Gas engine pulls hard (won't start)
Gas engine does not start
Gas engine doesn't work properly
Gas engine operates, but displace-
ment 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
*Check hydraulic fluid level often. Do not allow it to become too low. Use only Graco approved hydraulic fluid, page 7.
Troubleshooting
CAUSE
Hydraulic pressure is too high
Switch OFF, low oil, no gasoline
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
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 buildup 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
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 hy-
draulic 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 suction tube
Tighten packing nut 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
assembly, tighten, then reprime pump
Tighten
Refill supply container
Shut off sprayer. Add fluid*. See page 7.
19
309548
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