Hitachi 220-856 - Manual (Page 12)

12 307-830
Troubleshooting
PROBLEM CAUSE SOLUTION
Paint leaks into wet-cup Packing nut is loose Tighten. See page 8.
Throat packings are worn or
damaged Replace packings. See page 14.
Excessive surging from spray
gun Spray tip or fluid filter is plugged Disassemble and clean.
Spray tip too big or worn Change spray tip.
Paint too viscous Thin the paint.
Wrong type hose Use minimum 50 ft (15 m), grounded, flex-
ible hose (wire braid hose is
unacceptable).
Not enough paint pressure Pressure setting too low Increase the pressure.
Spray tip too big or worn Change the spray tip.
Pressure control frozen or damaged
by overpressurization
3
Try to thaw 2 , or replace pressure control.
Pump worn or damaged Replace pump. See page 14.
Tails or fingers in spray
pattern Pressure setting too low Increase pressure.
Fluid outlet filter (if used) is dirty or
clogged Clean filter. See instructions supplied
with it.
Spray tip too big or worn Change spray tip.
Fluid supply is low or empty Refill and prime pump. Check fluid supply
often to prevent running pump dry.
Paint too viscous Thin paint.
Wrong type hose Use minimum 50 ft (15 m), grounded, flex-
ible hose (wire braid hose is
unacceptable).
Paint runs or sags Spray tip to big or worn Change spray tip.
Spitting from gun Air in fluid pump or hose Check for loose connections at pump
intake and tighten. Then prime pump.
Spray tip is partially clogged Clear tip. See page 8.
Fluid supply is low or empty Refill and prime pump. Check fluid supply
often to prevent running pump dry.
Static sparking from gun Spray or work being sprayed is not
properly grounded Correct problem before continuing. Follow
the warning section, FIRE OR EXPLO-
SION HAZARD on page 2.
1 The electric motor has an over-temperature switch
which automatically resets upon cooling. If it opens and
the electric motor shuts itself off, unplug the power supply
cord and let the sprayer cool for 30 to 60 minutes. Always
use the lowest pressure setting needed when spraying.
Prevent overspray from restricting the motor air pas-
sages; check and clean often.
2 Freezing results from failure to replace the water-base
paint or flushing water with mineral spirits, and usually
causes permanent damage to the pressure control.
3 Over-pressurization results from (1) using less than 50
ft (15 m) of flexible spray hose, (2) from using a wire braid
spray hose, (3) from adding a shutoff device between the
pump outlet and the spray gun, (4) from attaching a spray
hose to the pressure drain valve, or (5) from using a
clogged or incorrectly assembled filter, if used.