Hitachi 220-856 - Manual (Page 11)

307-830 11
Troubleshooting
WARNING
Pressure Relief Procedure
To reduce the risk of serious bodily injury always
follow this procedure before checking or repairing the
sprayer.
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 to relieve pressure.
5. Engage the gun safety latch.
6. Open the pressure drain valve. Leave the valve
open until you are ready to spray again.
If you suspect that the spray tip or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above, VERY SLOWLY
loosen the tip guard retaining nut or hose end cou-
pling to relieve pressure gradually, then loosen
completely. Now clear the tip or hose.
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 cir-
cuit breaker or fuse has tripped Check, reset or replace.
Motor overload switch 1 has opened Unplug sprayer, relieve pressure, allow
motor to cool, decrease pressure.
Pressure setting too low Increase pressure.
Pressure control frozen or damaged
by over–pressurization Try to thaw 2 , 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 sprayer, relieve pressure, allow
motor to cool, clear motor air passages of
dirt and overspray; decrease pressure.
Pressure setting too low Increase pressure.
Spray tip plugged Remove and clean.
Wrong type extension cord Use maximum 200 ft (61 m), 3 wire,
12 gauge, grounded extension cord.
Electric motor runs, but low
paint output or no paint out- Piston ball check not seating Service pump. See page 14.
paint output or no paint out-
put, and pump is not stroking
Piston packings worn or damaged Replace piston. See page 14.
put, and pump is not stroking
See the PROBLEM, “Not
enough paint pressure” on Intake valve ball check not seating Service pump. See page 14.
enough paint pressure”, on
page 12, also.
Pump is frozen Thaw 2
p g ,
Pressure control frozen or damaged
by overpressurization
3
Try to thaw 2 , or replace pressure control.
Drive assembly damaged Replace drive housing. See page 16.
Pump worn or damaged Replace pump. See page 14.
Sprayer is not primed. Follow the procedure on page 7 again.