Graco Hydra-Spray EH 433 GT Series Instructions-Parts List Manual page 14

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