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Operation
Starting and Adjusting the Pump
See Fig. 2 on page 7. Be sure the air regulator (E)
and bleed-type master air valve (D) are closed. Do not
install the spray tip yet!
Connect a suction hose (N) to the pump’s fluid inlet.
Hold a metal part of the spray gun (M) firmly to the
side of a grounded metal pail and hold the trigger
open. Then open the pump’s bleed-type master air
valve (D). Now slowly open the air regulator until the
pump starts, about 40 psi (0.3 MPa, 3 bar).
Cycle the pump slowly until all the air is pushed out
and the pump and hoses are fully primed. Release the
spray gun trigger and lock the trigger safety. The pump
should stall against pressure when the trigger is re-
leased.
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. Install the spray tip as explained
in your separate gun manual.
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 opened and closed. In a circu-
lating system, the pump will run continuously and will
speed up or slow down as supply demands until the air
supply is shut off.
Use an adequately sized air regulator (E) to control the
pump speed and the fluid pressure. Always use the
lowest air pressure necessary to get the desired re-
sults. Higher pressures waste fluid and cause prema-
ture wear of the pump packings and spray tip.
WARNING
COMPONENT RUPTURE HAZARD
To reduce the risk of overpressurizing
your system, which could cause compo-
nent rupture and serious injury, never
exceed the Maximum Air Input Pressure marked
on the pump. Refer to the Technical Data on page
20.
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.
A pump runaway valve (B), which shuts off the air
supply to the pump if the pump accelerates beyond
the pre-set speed, is available. See Fig. 2 on page
7. Contact your Graco distributor for further infor-
mation.