Graco 600 Instructions Manual page 13

Fluid Packing Replacement
1. If leakage occurs at the fluid needle packing nut
(9), tighten the nut. If leakage cannot be stopped
by tightening the packing nut, remove the fluid ad-
justing valve knob (6), spring (7) and needle (1).
See Fig. 3.
2. Unscrew the packing nut (9) and remove the old
packings (10). A small hooked tool can be used to
remove packings from the gun body. Clean and
inspect all the parts for wear or damage, replacing
parts as needed.
3. Lubricate the new packings with lightweight oil and
insert them into the gun body in the order shown in
Fig. 3, Detail D.
4. Install the needle (1), spring (7) and fluid adjust-
ment knob (6) into the gun body. Slide the packing
nut (9) onto the needle before inserting the needle
into the packing cavity.
Service
5. Turn the fluid adjustment knob (6) in until it bot-
toms out, then back it out six full turns for proper
spring adjustment.
6. With the trigger released, screw the packing nut
(9) in until the packing is fully compressed, then
back the nut off until the needle moves freely when
the gun is triggered.
NOTE: For the best fluid packing life, lubricate the gun
daily as explained in Maintenance.
Installing Fluid and Air Fittings
If the fluid fitting (22) is removed, be sure to install its
gasket and washer when reinstalling the fitting. Apply
Loctite 242 sealant or equivalent on the fluid fitting
threads and torque it into the gun body to 20 ft-lb
(27 N m).
If the air fitting (23) is removed, apply Loctite PST
pipe sealant or equivalent to its threads and screw it
into the gun body.