Graco A Series Instructions-Parts List Manual page 10

Starting and Adjusting the Pump
Be sure the two air regulators (B and C) and the
bleed–type master air valve (F) are closed. DO NOT
INSTALL THE SPRAYER TIP!
Connect the air line coupler (503) to the pin fitting
(502).
Open the gun air regulator (C). Hold a metal part of the
spray gun (H) firmly to the side of a grounded metal
pail and trigger the gun. Open the bleed-type master
air valve (F) and slowly open the pump air regulator
(B) until the pump starts. Allow the pump to cycle
slowly 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.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
Relieve the pressure, then install the spray tip in the
gun.
Use the pump air regulator (B) 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.
CAUTION
Do not allow the pump to run dry. It will quickly
accelerate to a high speed, causing damage. If your
pump is running too fast, stop it immediately and
check the fluid supply. If the container is empty and
air has been pumped into the lines, refill the con-
tainer and prime the pump and the lines, or flush and
leave it filled with a compatible solvent. Eliminate all
air from the fluid system.
307–917
Operation
Shutdown and Care of the Pump
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
For overnight shutdown, stop the pump at the bottom
of its stroke to prevent fluid from drying on the ex-
posed displacement rod and damaging the throat
packings. Relieve the pressure.
Always flush the pump before the fluid dries on the
displacement rod. See Flushing below.
Flushing
Flush the pump:
Before the first use
When changing colors or fluids
Before fluid can dry or settle out in a dormant pump
(check the pot life of catalyzed fluids)
Before storing the pump.
Flush with a fluid that is compatible with the fluid you
are pumping and with the wetted parts in your system.
Check with your fluid manufacturer or supplier for
recommended flushing fluids and flushing frequency.
WARNING
WARNING
FIRE AND EXPLOSION HAZARD
Before flushing, read the section FIRE
OR EXPLOSION HAZARD on page 4.
Be sure the entire system and flushing
pails are properly grounded. Refer to
Grounding on page 5.