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308–507
5
STARTUP
Use this procedure whenever starting the pressure
washer
to help
insure that the unit is ready to operate and
starting
is done safely
.
1. T
urn on the water supply
.
CAUTION
Never
run the unit dry
. Costly damage to the pump
will result. Always be sure the water supply is
completely
turned on before operating.
2. T
urn on the air supply
.
3. T
rigger the gun to start.
4.
ALWAYS
engage the gun’ s trigger safety latch
whenever
you stop spraying, even for a moment, to
reduce the risk of fluid injection or splashing in the
eyes
or on the skin if the gun is
bumped or triggered
accidentally.
5.
ALWAYS
observe the following
CAUTIONS
to avoid
costly
damage to the pressure washer
.
CAUTION
DO NOT
run the pump dry , which will quickly
damage the pump. Be sure the water supply is
fully
turned on before starting the pump.
DO
N
OT
o
perat
e t
h
e p
ressur
e w
ashe
r w
it
h t
h
e i
nlet
water screen removed. This screen helps keep
abrasive sediment out of the pump, which could
clog
o
r s
cratc
h t
h
e p
ump
. K
ee
p t
hi
s s
cree
n c
lean.
DO NOT
pump caustic
materials; such materials
may corrode the pump components.
OPERATION
Two factors control the flowrate and spray pressure of
Graco
air–powered pressure washers: the orifice size of
the spray tip and the air inlet pressure. Adjust these
factors to get the desired flowrate and spray pressure,
but
never allow the pump to exceed 60 cpm. T
o
increase
the flowrate, increase the spray tip orifice or the air inlet
pressure.
Both factors will increase the pump speed, but
the larger tip orifice will reduce the spray pressure. T o
increase the spray pressure, increase the air inlet
pressure.
Adjustable Nozzle (800–412 & 800–413)
Insert
the chemical
filter (attached with the clear tubing to
the
chemical injector) into the container of chemical. T
urn
the
control ring on the adjustable nozzle clockwise. This
causes a drop in pressure that actuates the chemical
injector. Closing the adjustable nozzle deactivates the
chemical
injector and produces high pressure for rinsing.
The
flow rate of the chemical may be regulated by turning
the
chemical adjustment knob on the injector
. Maximum
chemical
flow is at a full two turns counterclockwise from
the
closed (clockwise) position.
WARNING
DO NOT
attempt to open or close the adjustable
nozzle
when the spray gun is
in use.
BE SURE
that
the trigger safety latch on the gun is in the “ON”
position before adjusting to avoid serious bodily
injury
or fluid injection.
Changeable Spray Tips (800–295 only)
Insert
the chemical
filter (attached with the clear tubing to
the chemical injector) into the container of chemical.
Install
the large orifice chemical tip (see Installing and
Changing Spray Tips). This causes a drop in pressure
that actuates the chemical injector. Changing back to a
small
diameter spray
tip deactivates the chemical injector
and produces high pressure for rinsing. The flow rate of
the chemical may be regulated by turning the chemical
adjustment
knob on
the injector
. Maximum chemical flow
is at a full two turns counterclockwise from the closed
(clockwise)
position.
Cleaning
No
more than 100 feet (30 m) of spray hose may be used
between the chemical injector and the spray gun when
the
operator is at the same level as the chemical injector
.
If
the operator is over 25 feet above the chemical injector
,
no
more than 50 feet (15 m) may be used.
Check the distance that you will need to hold the spray
nozzle from the surface by test spraying on a scrap of
similar
material. For soft surfaces, such as wood, hold the
nozzle about 3 ft (1 m) from the surface and gradually
bring
it closer
, checking to see if the high pressure
spray
is
damaging the surface.
Mist
wet the surface with cleaning solution, moving from
bottom to top. Let it soak briefly , then use the high
pressure
rinse to “chisel” off the soil, moving from top to
bottom. Keep the nozzle angled to the surface and at a
distance determined to be best for the surface. If some
soil remains, repeat the procedure, letting the chemical
soak
a
little longer
. Stubborn soil can be cleaned of
f better
with
a stronger
, heated cleaning solution.
Protect
surfaces that might be damaged by the cleaning
solution
or high pressure spray
. Rinse the solution before
it
dries.