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19309548
Troubleshooting
To reduce risk of serious injury, when instructed to relieve pressure, do steps 1. – 3.; page 14.
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, supplied
Gas engine doesn’t work properly
Elevation
Consult engine manual, supplied.
Refer to 6.5 HP Engine Repair Kit, 246311.
Gas engine operates, but displace-
ment pump doesn’t operate
Pump valve is OFF Set pump valve ON
Pressure setting too low Increase pressure, page 10
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 7.
Belt worn or broken Replace. See manual 310548.
Hydraulic pump worn or damaged Bring sprayer to Graco distributor for repair
Dried paint seized paint pump rod Service pump. See manual 309277.
Hydraulic motor not shifting Set pump valve OFF. Turn pressure down.
Turn engine OFF. Pry rod up or down until hy-
draulic motor shifts. Manual 310548.
Displacement pump operates, but
output is low on upstroke
Piston ball check not seating properly.
Piston packings worn or damaged.
Service piston ball check. See manual 309277.
Replace packings. See manual 309277.
Displacement pump operates but
output is low on downstroke and/or
on both strokes
Piston packings worn or damaged.
Intake valve ball check not seating
properly.
Suction tube air leak
Tighten packing nut or replace packings. See
manual 309277.
Service intake valve ball check. See manual
309277.
Tighten suction tube
Paint leaks and runs over side of
wetcup
Loose wet–cup
Throat packings worn or damaged
Tighten packing nut enough to stop leakage
Replace packings. See manual 309277.
Excessive leakage around hydraulic
motor piston rod wiper
Piston rod seal worn or damaged Replace these parts. See manual 310548.
Fluid delivery is low 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
Increase pressure, page 10
Clean filter
Tighten
Bring sprayer to Graco distributor for repair
Use larger diameter or shorter hose
The sprayer overheats Paint buildup on hydraulic components Clean
Oil level is low Fill with oil. See page 7.
Spitting from gun Air in fluid pump or hose Check for loose connections on siphon
assembly, tighten, then reprime pump
Loose intake suction Tighten
Fluid supply is low or empty Refill supply container
Excessive hydraulic pump noise Low hydraulic fluid level Shut off sprayer. Add fluid*. See page 7.
*Check hydraulic fluid level often. Do not allow it to become too low. Use only Graco approved hydraulic fluid, page 7.