Graco 218-501, Instructions-Parts List Manual

Page: 9 / 24

307-711
9
Startup
6. Turn the bypass valve (66) clockwise (finger tight)
to close it; this allows the pump to build up pressure.
Fig. 3
Fig. 4
27
66
4
Decrease pressure
(counterclockwise).
Increase pressure (clockwise).
Open (counterclockwise).
Close (clockwise).
22
26
A
7. Release the trigger safety lever and trigger the gun
onto a piece of paper to check the spray pattern. Ad-
just the pressure setting to obtain the best atomiza-
tion and spray pattern.
Always use the lowest
pressure necessary. Excessive pressure causes
premature tip wear and pump wear.
NOTE: If you cannot obtain a good spray pattern or ade-
quate atomization, your paint may be too thick. Thin the
paint according to the manufacturer’s recommendations
until you can get good atomization.
8. Whenever you stop spraying, even for a moment, al-
ways set the trigger safety lever to prevent acciden-
tally trigger the gun.
9. Whenever you stop spraying for more than a mo-
ment, or if you must leave the sprayer unattended,
shut it off and follow the Pressure Relief Procedure
on page 8.
NOTE: The sprayer will not restart if it was left pressur-
ized after shutting it off. Relieve pressure, then start the
sprayer.
Fig. 5
Lubricate the threads.
Torque to 170–200 in-lb (19–23 N.m.)
Torque to 320–360 in-lb (36–41 N.m.)
22
26
25
10.
After the first 3 to 5 hours of operation torque the
four screws (25) on the bottom of the paint pump (22)
to 170–200 in-lb (19–23 N.m.) See Fig. 5.
11. Also torque the inlet valve (26) to 320–360 in-lb
(36–41 N.m.)
CAUTION
Failure to properly tighten the inlet valve and screws
at the intervals indicated will result in oil leaking from
the hydraulic system into the paint, and can cause
costly damage to the sprayer.
12. Repeat these torques after another 3 to 5 hours of
operation, and then after each 25 hours of operation
(about weekly).
startup procedure continued on page 10