Graco PT2500 - Manual (Page 12)

12 820-133
Startup
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 cause
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 11.
NOTE: The sprayer will not restart if it was left pressur-
ized after shutting the sprayer off. Relieve the pressure,
then start the sprayer.
Fig. 5 0273
1
3
2
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 1 2
1 3
10. After the first 3 to 5 hours of operation torque the
four screws (25) on the bottom of the paint pump 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).
12. Repeat these torques after another 3 to 5 hours of
operation, and then after each 25 hours of operation
(about weekly).
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.
CAUTION
Never start the electric motor with the inlet valve re-
moved to avoid damaging the diaphragm.
13. If you have a Reverse-A-Clean IV tip guard on your
gun and the tip clogs while spraying, release the gun
trigger, lock the trigger safety lever, and rotate the
spray tip handle 180
_
. See Fig. 6.
14. Unlock the safety lever and trigger the gun into a
grounded metal waste container. Hold a metal part
of the gun firmly to the side of the container to reduce
the risk of static sparking and splashing. The fluid
pressure should force the obstruction from the tip.
Lock the safety lever.
15. Return the handle to the original position, unlock the
safety lever, and resume spraying.
Fig. 6 0278
16. If the tip is still clogged, lock the trigger safety lever,
shut off and unplug the sprayer, and open the bypass
valve one turn counterclockwise. Disassemble the
tip in the reverse order of assembly (see manual
307–848). Thoroughly clean all parts in a compatible
solvent and inspect for wear or damage. Replace
parts as needed and reassemble. Be sure to use a
new seal and gasket when changing tips.
17. If you have a tip guard on your gun which is not self-
clearing, follow step 12.
18. Spraying techniques are given on page 15.
19. Important maintenance procedures are given on
pages 13 and 14.