Operation - Graco 218-174 Instructions-Parts List Manual

OPERATION

WARMING
T
reduce the risk of serious bodily injury, in-
O
cluding fluid injection, splashing in the eyes or on
or injury from moving parts. always
the skin,
follow the Pressure Relief Procedure on page
whenever you shut off the pump, when checking
or servicing any part of the spray system, when in-
stalling, cleaning or changing spray tips, and
whenever you stop soravine.
Flush the Pump.Before Using
The pumps are tested with light weight oil which is
in to protect the pump parts.
of the fluid, flush the pump with a compatible solvent
it.
If the pump is being used to supply a cir-
before using
culating system, ellow the solvent to circulate until the
pump is thoroughly flushed.
Before flushing, be sure the entire system and
flushing pails ere properly grounded. Refer to
Grounding on page
Relief Procedure on page
gun.
spray from the
tip
to-metal contact between the gun and the pail
during flushing to reduce the risk of fluid injection
injury, static sparking and splashing.
MAINTAIN FIRM MAINTAIN FIRM
METALTO METAL METALTO METAL
CONTACT BETWEEN CONTACT BETWEEN
GUN AND CONTAINER GUN AND CONTAINER
Starting and Adjusting the Pump
Do not install a spray tip yet.
Open the bleed-type master air valve while triggering
the spray gun into a grounded metal pail, and slowly
open the air supply valve until the pump
(2.8
psi bar)]. Allow the pump to cycle slowly until
of
the air is pushed out the lines. The lines ara purged
when the fluid emitted from the gun
'steady stream. Release the trigger-the pump will stall
against the pressure. Follow the Pressure Relief Pro-
2 install
cedure on page and
a
In direct supply system when the pump and the lines
are primed, and adequate air pressure and volume are
start
supplied, the pump will
is triggered and released. In a circulating system, the
pump will run continuously and speed,up or slow down
with the increase or decrease of the e1r supply until the
off.
air supply is shut
2
left
To prevent contamination
3.
Follow the Pressure
2,
and remove the
Always use the lowest
starts
[about
is
flowing in
the spray tip.
and stop as the spray gun
Use the air regulator
pump speed. Always use the lowest air pressure
necessary to obtain the desired results. Higher
pressures waste fluid and causa premature wear of the
pump packings and spray tip.
Keep the wet-cup half filled with TSL to help prolong
life.
the packing Check the tightness of the packing nut
weekly. The packing nut should be tight enough to pre-
vent leakage-no tighter. See Fig
the Pressure Relief Procedure, on page
justing the packing nut.
3
Never allow the pump to run dry of the fluid being
pumped. A dry pump will quickly accelerate to
speed, possibly damaging itself. (A pump runaway
valve automatically elerts you to this problem, see IN-
running too fast, stop
If the
supply. supply container is empty
pumped into the lines, refill the supply container and
prime the pump and the lines with fluid, being sure to
eliminate all the air from the fluid system, or flushthe
as
pump described in Shutdown and Cere of the
Pump, below.
Shutdown end Care
Always follow the Pressure Rellef Procedure, on
2 ,
all
whenever you shut off the pump. Stop the
page
at
pump the bottom of its stroke to keep fluid from dry-
a
ing on the exposed displacement rod and damaging the
throat packing. Always flush the pump with
ble solvent before fluid can dry in the pump and the
hoses.
At the end of each day, if you are pumping weter based
first
fluid, flush with water, then with mineral spirits to
protect the pump parts. When pumping with oil-base
fluid, just flush with mineral spirits. Follow the
Pressure Rellef Procedure on page
mineral spirits in the pump to prevent corrosion.
to control fluid pressure and
3.
ALWAYS follow
2,
before ad-
immediately and check the fluid
it
and
air has been
of
the Pump
a
compati-
2,
and leave the
a
high
is
5