Graco 220-726, Instructions And Parts List

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TROUBLESHOOTING GUIDE
Pressure Relief Procedure
To 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 off the sprayer, when checking, adjusting or
cleaning the system, and when changing spray tips.
1. Engage the gun safety latch.
2. Turn the ON/OFF switch to OFF.
3. 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.
5. 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, VERY SLOWLY 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
1
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
2
or damaged by
over–pressurization
3
Try to thaw, or replace pressure control.
Electric motor stops while
spraying Power cord or extension cord un-
plugged, or damaged, or building circuit
or fuse is blown Check, reset or replace.
Motor overload switch
1
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.
Wrong 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
2
Filter element installed upside down Install element correctly. See page 14 or manual
307–273.
Pressure control frozen
2
or damaged by
over–pressurization
3
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.