Graco Inc. 237-296 - Manual (Page 9)

308-425 9
Operation
CAUTION
To avoid tip-over, the cart must be on a flat and level
surface. Failure to follow this caution could result in
injury or equipment damage.
Prime the Pump
1. See Fig. 3. Remove the tip guard and spray tip
from the gun (102). See the gun instruction manu-
al.
2. Close the air filter/regulator (H) and bleed-type air
valves (B, F).
3. Close the fluid drain valve (D).
4. Connect the air line (A) to the air inlet swivel (G).
5. Check that all fittings throughout the system are
tightened securely.
6. Place the suction tube (7) into the fluid supply
container.
7. Open the bleed-type air valves (B, F).
8. Hold a metal part of the gun (102) firmly to the side
of a grounded metal pail and hold the trigger open.
9. Slowly open the air filter/regulator (H) until the
pump starts.
10. Cycle the pump slowly until all air is pushed out
and the pump and hoses are fully primed.
11. Release the gun trigger and lock the trigger safety.
The pump should stall against pressure.
12. If the pump fails to prime properly, open the drain
valve (D). Use the drain valve as a priming valve
until the fluid flows from the valve. Close the valve.
NOTE: When changing fluid containers with the hose
and gun already primed, open the drain valve (D) to
help prime the pump and vent air before it enters the
hose. Close the drain valve when all air is eliminated.
Set the Air and Fluid Pressure
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
1. Relieve the pressure. Install the tip guard and
spray tip in the gun, as explained in the gun manu-
al.
2. Open the air filter/regulator (H) slowly. Use the
regulator to control pump speed and fluid pres-
sure. Always use the lowest air pressure neces-
sary to get the desired results. Higher pressures
cause premature tip and pump wear.
NOTE: To open the air filter/regulator, turn the
T-handle in (clockwise). To close the regulator, turn the
handle counterclockwise. To lock the regulator setting,
tighten the jam nut.
WARNING
COMPONENT RUPTURE HAZARD
To reduce the risk of overpressurizing
your system, which could cause compo-
nent rupture and serious injury, never
exceed the specified Maximum Incoming Air Pres -
sure to the pump (see the Technical Data, on
page 18).
3. With the pump and lines primed, and with ade-
quate air pressure and volume supplied, the pump
will start and stop as you open and close the gun.
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.