Graco Inc. EM390 User Manual download pdf (Page 16)

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TROUBLESHOOTING GUIDE

Pressure

Relief Procedure

reduce the risk of serious bodily injury

, including fluid

injection,

splashing in the eyes or on the skin, or injury

from moving parts, always follow this procedure when

you

shut of

f the sprayer

, when checking, adjusting

cleaning

the system, and when changing spray tips.

Engage the gun safety latch.

2. T

urn the ON/OFF switch to OFF

Unplug the power supply cord.

4. Disengage

the gun safety latch. Hold a metal part

of the gun firmly to the side of a grounded metal

pail,

and trigger the gun.

Engage the gun safety latch.

6. Open the fluid pressure drain valve and leave it

open

until you start the sprayer again.

If you suspect the hose or spray tip is completely

clogged

or that pressure is

not fully relieved after fol

lowing

the steps above,

VER

Y SLOWL

Y loosen the tip

guard retaining nut or hose end coupling and relieve

pressure gradually. Now loosen the part completely.

Clear

the tip or hose obstruction.

WARNING

Check everything in the chart before disassembling the sprayer

PROBLEM CAUSE SOLUTION

Electric

motor won’t run

Power cord or extension cord un-

plugged, or damaged, or building circuit

breaker

or fuse has tripped

Check, reset or replace.

Motor overload switch

has opened

Unplug

power supply cord, relieve pressure, al

low motor to cool, clear motor air passages of

dirt and overspray, decrease pressure.

Pressure setting too low

Increase pressure.

Pressure

control frozen

or damaged

over–pressurization

Try

to thaw

, or replace pressure control.

Electric motor stops while

spraying

Power cord or extension cord un-

plugged, or damaged, or building circuit

fuse is blown

Check, reset or replace.

Motor overload switch

has opened

Unplug

power supply cord, relieve pressure, al

low motor to cool, clear motor air passages of

dirt and overspray, decrease pressure.

Pressure setting too low

Increase pressure.

Spray tip or filter plugged

Remove and clean.

rong type extension cord

Use

maximum 200 ft. (61 m), 3 wires, 12

gauge,

grounded

extension cord.

Electric motor runs, but low paint

output

or no paint output;

or pump is not stroking

Piston ball check not seating

Service the pump. See page 18.

See

the

PROBLEM, “

Not enough

paint

pressure”, on page 17, also

Piston packings worn or damaged

Replace the piston. See page 18.

Intake valve ball check not seating

Service the pump. See page 18.

Pump is frozen

Thaw

Filter element installed upside down

Install

element correctly

. See page 14 or manual

307–273.

Pressure

control frozen

or damaged

over–pressurization

Try

to thaw

, or replace pressure control.

Drive assembly damaged

Replace drive housing. See page 21.

Displacement pump worn or damaged

Replace displacement pump. See page 18.

Sprayer is not primed.

Prime sprayer

. See page 10.

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Graco Inc. EM390 User Manual Page 16

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