Troubleshooting
46
3A3394E Repair - Parts
Engine operates, but
displacement pump does
not operate
Engine clutch switch is OFF.
Turn engine clutch switch ON.
Pump ball valve is OFF.
Turn pump ball valve ON.
Pressure setting is too low.
Turn pressure adjusting knob clockwise to increase
pressure. See Operation manual.
Prime/drain valve is closed and system
is pressurized.
Open prime/drain valve.
Hydraulic fluid too low.
Shut off sprayer. Add fluid*.
Oil reservoir belt is worn, broken, or off
the pulley.
Replace oil reservoir belt, see
Tip is clogged.
Reverse tip to clean. See Operation manual.
Displacement pump piston rod is stuck due to
dried paint.
Repair pump. See Pump manual.
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 is not seating.
Service piston ball. See Pump manual.
Piston packings are worn or damaged.
Replace packings. See Pump manual.
Displacement pump operates but output
is low on downstroke and/or on both
sides
Suction tube strainer is clogged.
Clean strainer.
Suction tube air leak.
Tighten suction tube.
Pressure setting is too low.
Increase pressure. See Operation manual.
Fluid filter or tip is clogged or dirty.
Clean filter and tip. See Operation manual or gun
manual.
Engine speed is too low.
Increase throttle setting. See Operation manual.
Intake valve ball is packed with material or is not
seating properly.
Clean intake valve. See Pump manual.
Pump packings are worn or damaged.
Replace pump packings. See Pump manual.
Large pressure drop in hose with heavy
materials.
Use larger diameter hose and/or reduce overall length of
hose. Use of more than 100 ft x 1/4 in. hose significantly
reduces performance of sprayer. Use 3/8 in. hose for
optimum performance.
Oil reservoir hydraulic filter is dirty or clogged.
Change hydraulic filter and hydraulic oil.
Intake line to pump inlet is not tight.
Tighten intake line to pump inlet.
Hydraulic motor is worn or damaged.
Bring sprayer to Graco distributor for repair.
Pump is difficult to prime
Suction tube strainer is clogged.
Clean strainer
Suction tube air leak.
Tighten suction tube
Drain line to paint hopper is clogged.
Clean drain line
Intake valve is leaking.
Clean intake valve. Be sure ball seat is not nicked or
worn and that ball seats well. Reassemble valve.
Pump packings are worn.
Replace pump packings. See Pump manual.
Paint is too thick.
Thin the paint according to supplier recommendations.
Engine speed is too high.
Decrease throttle setting before priming pump. See
Operation manual.
Low stall or run pressure shown on
display
Pressure setting too low.
Turn pressure adjusting knob clockwise to increase
pressure. See Operation manual.
New pump or new packings.
Pump break-in period takes up to 100 gallons
of material.
Faulty transducer.
Replace transducer.
Problem
Cause
Solution
Содержание 17H466
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