Graco Hydra-Spray EH 433 GT Series - Page 14

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TROUBLESHOOTING GUIDE
PROBLEM CAUSE SOLUTION
Electric motor won’t run or stops
while spraying
Sprayer unplugged or fuse blown Check fuse, replace.
Defective switch or electric motor Replace switch or motor .
Overheating switch has opened Unplug sprayer
1
.
Electric motor runs but pump
won’t work
Hydraulic motor stalled See Step 5 in MAINTENANCE , page 13.
Pressure setting too low Increase pressure setting.
Outlet filter is dirty or plugged Clean filter . See manual 307–273.
T ip is plugged Use Reverse-A-Clean feature to clear clog,
or relieve pressure and remove to clean.
Hydraulic fluid level is low Check hydraulic fluid level, and add fluid
2
.
Hydraulic pump is worn or damaged Check pump, replace if needed.
Hydraulic motor is worn or damaged Check motor – see manual 306–980;
replace if needed.
Displacement rod is stuck due to dried fluid Repair pump. See page 16.
Pump runs but output is low Piston ball not seating Service. See page 16.
Piston packings worn or damaged Replace. See page 16.
Intake valve ball not seating Service. See page 16.
Excessive leaking around
hydraulic motor piston rod wiper
W orn or damaged piston rod or seal Replace. See manual 306–980.
Fluid leaks into wet-cup Throat packings worn or damaged Replace. See page 16.
Excessive surge at spray gun Outlet filter is dirty or plugged Clean. See manual 307–273.
T ip is plugged Use Reverse-A-Clean feature to clear , or
relieve pressure and remove tip to clean.
Spray tip is too big or worn Change tip.
Insuf ficient fluid atomization Pressure setting is too low Increase.
Outlet filter is dirty or plugged Clean. See manual 307–273.
Hydraulic fluid level is low Check, add fluid
2
.
Hydraulic pump is worn or damaged Check, replace. See page 19.
Hydraulic motor is worn or damaged Check motor – see manual 306–980;
replace if needed.
Fluid coating is too thick Spray tip is too big or it is worn Change tip.
T ails or fingers in spray pattern Pressure drop in hose Use larger hose.
Fluid supply is low or exhausted Check, refill.
Spitting from spray gun Fluid supply is low or exhausted Check, refill.
Static sparking from spray gun Sprayer or work piece is not grounded Stop spraying immediately . Check for proper
grounding as described on page 3.
Gun will not spray Drain valve is open Close.
Hose or tip is clogged Relieve pressure, then clear the clog.
1
The electric motor has an overheating protection switch
which
will automatically reset upon cooling. If it opens, un -
plug
the sprayer and let it cool for up to 20 minutes. T ry to
correct the cause of overheating.
2
When adding hydraulic fluid to the sump,
use only Graco approved fluid. See ACCESSORIES on
page
25.