Graco GM3500 Instructions-Parts List Manual page 10

9. To start the pump:
a. Open the pressure drain valve (V).
b. Turn the pressure control switch (A) to ON.
c. Slowly increase the pressure knob (B) until the
pump starts to cycle slowly. Cycle the pump
slowly until fluid is flowing smoothly from the
pressure drain valve, indicating the pump is
fully primed.
d. Close the pressure drain valve (V).
e. Hold a metal part of the gun firmly against a
grounded metal container, squeeze the trigger
until fluid is flowing smoothly from the gun.
f. Release the trigger and engage the gun
safety latch.
WARNING
To reduce the risk of serious bodily injury from fluid
injection, NEVER operate the spray gun with the tip
guard removed.
10. Install the spray tip. Refer to the instruction
manual supplied with the tip (307–848 if you are
using a RAC IV).
11. Adjust the engine speed and pump pressure.
Trigger the gun onto a test paper to check the
spray pattern and atomization. Turn the pressure
adjusting knob (B) until you get a good pattern.
Then slowly lower the throttle (J) setting as far as
you can without changing the spray pattern.
Startup
Always use the lowest needed fluid pressure and the
lowest needed throttle (J) setting, to increase the life
of the sprayer. Higher settings cause excessive
clutch cycling, premature tip wear and premature
pump wear.
Close the fuel valve (G) when transporting the sprayer
to prevent fuel from flooding the engine.
Keep the sprayer upright and level when operating it
and when transporting it. This prevents crankcase oil
from leaking into the combustion chamber, which
makes start up very difficult.
Gun safety latch shown
engaged
Gun safety latch shown
disengaged
Fig. 4
CAUTION
CAUTION