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8 308–367
Operation
Starting and Adjusting the Pump
WARNING
To
reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 7.
See Fig. 5. Be sure the air regulators (F
, G) and bleed-
type master air valve (B) are closed.
Do not install
the spray tip yet.
On cart mount units,
place the suction tube (7) in the
fluid container
.
On wall mount units,
screw the bung adapter (18) into
the container
’
s bung hole. Slide the suction tube
assembly (J) through the bung adapter and into the
container
. Position the tube so the intake housing (1) is
about 1/2 in. (13 mm) of
f the bottom of the container
.
T
ighten the thumbscrew (26) to secure.
On pail mount units,
fill the pail (46) with fluid. Set the
cover (36) on the pail and secure with the latches (40).
Open the drain valve (H) to prime the pump. Open the
bleed-type master air valve (B). Open the gun air
regulator (G). Hold a metal part of the spray gun firmly
to the side of a grounded metal pail and trigger the
gun.
Slowly open the pump air regulator (F) until the pump
starts. Run the pump slowly until fluid comes from the
drain valve (H). Close the drain valve and continue to
run the pump until all the air is pushed out of the fluid
lines. Release the gun trigger and engage the safety
latch; the pump will stall against the pressure.
With the pump and lines primed, and with adequate air
pressure and volume supplied, the pump will start and
stop as the spray gun is triggered and released.
Relieve the pressure,
then install the spray tip in the
gun.
Use the pump air regulator (F) to control the pump
speed and fluid pressure. Always use the lowest
pressure necessary to achieve the desired results.
Higher pressures waste fluid and cause premature
wear of the pump packings and spray tip.
Keep the packing nut/wet-cup filled with Graco Throat
Seal Liquid (TSL) to help prolong the packing life.
Check the tightness of the packing nut weekly
. The
packing nut should be tight enough to prevent leakage
– no tighter
. Always
relieve the pressure
before
adjusting the packing nut.
Never allow the pump to run dry of the fluid being
pumped. A dry pump will quickly accelerate to a high
speed, possibly damaging itself. If you pump acceler
-
ates quickly
, or is running too fast, stop it immediately
and check the fluid supply
. If the supply container is
empty and air has been pumped into the lines, refill the
supply container and prime the pump and lines with
fluid, being sure to eliminate all air from the fluid sys
-
tem, or flush the pump as described in
Shutdown and
Care
, below
.
Shutdown and Care
WARNING
To
reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 7.
Always
relieve the pressure
whenever you shut of
f
the pump. Stop the pump at the bottom of its stroke to
keep fluid from drying on the exposed displacement
rod and damaging the throat packings.
Always flush the pump with a compatible solvent
before fluid can dry on the displacement rod, and at
the end of each day
.
Relieve the pressure
after
flushing.